Accumulo 2.x Documentation >> Configuration >> Server Properties (3.x)
Server Properties (3.x)
Edit this pageBelow are properties set in accumulo.properties or the Accumulo shell that configure Accumulo servers (i.e. tablet server, manager, etc). Properties labeled ‘Experimental’ should not be considered stable and have a higher risk of changing in the future.
| Property | Description |
|---|---|
| compaction.coordinator.* | Experimental Available since: 2.1.0 Properties in this category affect the behavior of the accumulo compaction coordinator server. |
| compaction.coordinator.compaction.finalizer.check.interval | Experimental Available since: 2.1.0 The interval at which to check for external compaction final state markers in the metadata table. type: TIMEDURATION, zk mutable: no, default value: 60s |
| compaction.coordinator.compaction.finalizer.threads.maximum | Experimental Available since: 2.1.0 The maximum number of threads to use for notifying tablet servers that an external compaction has completed. type: COUNT, zk mutable: no, default value: 5 |
| compaction.coordinator.compactor.dead.check.interval | Experimental Available since: 2.1.0 The interval at which to check for dead compactors. type: TIMEDURATION, zk mutable: no, default value: 5m |
| compaction.coordinator.message.size.max | Experimental Available since: 2.1.0 The maximum size of a message that can be sent to a tablet server. type: BYTES, zk mutable: no, default value: 10M |
| compaction.coordinator.port.client | Experimental Available since: 2.1.0 The port used for handling Thrift client connections on the compaction coordinator server type: PORT, zk mutable: no, default value: 9132 |
| compaction.coordinator.port.search | Experimental Available since: 2.1.0 If the ports above are in use, search higher ports until one is available type: BOOLEAN, zk mutable: no, default value: false |
| compaction.coordinator.threadcheck.time | Experimental Available since: 2.1.0 The time between adjustments of the server thread pool. type: TIMEDURATION, zk mutable: no, default value: 1s |
| compaction.coordinator.threads.minimum | Experimental Available since: 2.1.0 The minimum number of threads to use to handle incoming requests. type: COUNT, zk mutable: no, default value: 1 |
| compaction.coordinator.threads.timeout | Experimental Available since: 2.1.0 The time after which incoming request threads terminate with no work available. Zero (0) will keep the threads alive indefinitely. type: TIMEDURATION, zk mutable: no, default value: 0s |
| compaction.coordinator.tserver.check.interval | Experimental Available since: 2.1.0 The interval at which to check the tservers for external compactions. type: TIMEDURATION, zk mutable: no, default value: 1m |
| compactor.* | Experimental Available since: 2.1.0 Properties in this category affect the behavior of the accumulo compactor server. |
| compactor.message.size.max | Experimental Available since: 2.1.0 The maximum size of a message that can be sent to a tablet server. type: BYTES, zk mutable: no, default value: 10M |
| compactor.port.client | Experimental Available since: 2.1.0 The port used for handling client connections on the compactor servers type: PORT, zk mutable: no, default value: 9133 |
| compactor.port.search | Experimental Available since: 2.1.0 If the compactor.port.client is in use, search higher ports until one is available type: BOOLEAN, zk mutable: no, default value: false |
| compactor.queue | Experimental Available since: 3.0.0 The queue for which this Compactor will perform compactions type: STRING, zk mutable: no, default value: empty |
| compactor.threadcheck.time | Experimental Available since: 2.1.0 The time between adjustments of the server thread pool. type: TIMEDURATION, zk mutable: no, default value: 1s |
| compactor.threads.minimum | Experimental Available since: 2.1.0 The minimum number of threads to use to handle incoming requests. type: COUNT, zk mutable: no, default value: 1 |
| compactor.threads.timeout | Experimental Available since: 2.1.0 The time after which incoming request threads terminate with no work available. Zero (0) will keep the threads alive indefinitely. type: TIMEDURATION, zk mutable: no, default value: 0s |
| gc.* | Available since: 1.3.5 Properties in this category affect the behavior of the accumulo garbage collector. |
| gc.candidate.batch.size | Available since: 2.1.0 The batch size used for garbage collection. type: BYTES, zk mutable: yes, default value: 8M |
| gc.cycle.delay | Available since: 1.3.5 Time between garbage collection cycles. In each cycle, old RFiles or write-ahead logs no longer in use are removed from the filesystem. type: TIMEDURATION, zk mutable: yes, default value: 5m |
| gc.cycle.start | Available since: 1.3.5 Time to wait before attempting to garbage collect any old RFiles or write-ahead logs. type: TIMEDURATION, zk mutable: yes, default value: 30s |
| gc.port.client | Available since: 1.3.5 The listening port for the garbage collector’s monitor service type: PORT, zk mutable: yes but requires restart of the gc, default value: 9998 |
| gc.post.metadata.action | Available since: 1.10.0 When the gc runs it can make a lot of changes to the metadata, on completion, to force the changes to be written to disk, the metadata and root tables can be flushed and possibly compacted. Legal values are: compact - which both flushes and compacts the metadata; flush - which flushes only (compactions may be triggered if required); or none type: GC_POST_ACTION, zk mutable: yes, default value: flush |
| gc.safemode | Available since: 2.1.0 Provides listing of files to be deleted but does not delete any files type: BOOLEAN, zk mutable: yes, default value: false |
| gc.threads.delete | Available since: 1.3.5 The number of threads used to delete RFiles and write-ahead logs type: COUNT, zk mutable: yes, default value: 16 |
| general.* | Available since: 1.3.5 Properties in this category affect the behavior of accumulo overall, but do not have to be consistent throughout a cloud. |
| general.context.class.loader.factory | Available since: 2.1.0 Name of classloader factory to be used to create classloaders for named contexts, such as per-table contexts set by table.class.loader.context.type: CLASSNAME, zk mutable: no, default value: empty |
| general.custom.* | Available since: 2.0.0 Prefix to be used for user defined system-wide properties. This may be particularly useful for system-wide configuration for various user-implementations of pluggable Accumulo features, such as the balancer or volume chooser. |
| general.delegation.token.lifetime | Available since: 1.7.0 The length of time that delegation tokens and secret keys are valid type: TIMEDURATION, zk mutable: no, default value: 7d |
| general.delegation.token.update.interval | Available since: 1.7.0 The length of time between generation of new secret keys type: TIMEDURATION, zk mutable: no, default value: 1d |
| general.kerberos.keytab | Available since: 1.4.1 Path to the kerberos keytab to use. Leave blank if not using kerberoized hdfs type: PATH, zk mutable: no, default value: empty |
| general.kerberos.principal | Available since: 1.4.1 Name of the kerberos principal to use. _HOST will automatically be replaced by the machines hostname in the hostname portion of the principal. Leave blank if not using kerberoized hdfs type: STRING, zk mutable: no, default value: empty |
| general.kerberos.renewal.period | Available since: 1.6.5 The amount of time between attempts to perform Kerberos ticket renewals. This does not equate to how often tickets are actually renewed (which is performed at 80% of the ticket lifetime). type: TIMEDURATION, zk mutable: no, default value: 30s |
| general.low.mem.detector.interval | Available since: 3.0.0 The time interval between low memory checks type: TIMEDURATION, zk mutable: no, default value: 5s |
| general.low.mem.detector.threshold | Available since: 3.0.0 The LowMemoryDetector will report when free memory drops below this percentage of total memory type: FRACTION, zk mutable: no, default value: 0.05 |
| general.low.mem.protection.compaction.majc | Available since: 3.0.0 Major compactions may be paused when the server is low on memory and this property is set to true. Enabling this property will incur a slight compaction performance penalty when the server is not low on memory type: BOOLEAN, zk mutable: no, default value: false |
| general.low.mem.protection.compaction.minc | Available since: 3.0.0 Minor compactions may be paused when the server is low on memory and this property is set to true. Enabling this property will incur a slight compaction performance penalty when the server is not low on memory type: BOOLEAN, zk mutable: no, default value: false |
| general.low.mem.protection.scan | Available since: 3.0.0 Scans may be paused or return results early when the server is low on memory and this property is set to true. Enabling this property will incur a slight scan performance penalty when the server is not low on memory type: BOOLEAN, zk mutable: no, default value: false |
| general.max.scanner.retry.period | Available since: 1.7.3 The maximum amount of time that a Scanner should wait before retrying a failed RPC type: TIMEDURATION, zk mutable: no, default value: 5s |
| general.micrometer.enabled | Available since: 2.1.0 Enables metrics functionality using Micrometer type: BOOLEAN, zk mutable: no, default value: false |
| general.micrometer.factory | Available since: 2.1.0 Name of class that implements MeterRegistryFactory type: CLASSNAME, zk mutable: no, default value: empty |
| general.micrometer.jvm.metrics.enabled | Available since: 2.1.0 Enables JVM metrics functionality using Micrometer type: BOOLEAN, zk mutable: no, default value: false |
| general.opentelemetry.enabled | Experimental Available since: 2.1.0 Enables tracing functionality using OpenTelemetry (assuming OpenTelemetry is configured). type: BOOLEAN, zk mutable: no, default value: false |
| general.process.bind.addr | Available since: 3.0.0 The local IP address to which this server should bind for sending and receiving network traffic type: STRING, zk mutable: no, default value: 0.0.0.0 |
| general.rpc.server.type | Experimental Available since: 1.7.0 Type of Thrift server to instantiate, see org.apache.accumulo.server.rpc.ThriftServerType for more information. Only useful for benchmarking thrift servers type: STRING, zk mutable: no, default value: empty |
| general.rpc.timeout | Available since: 1.3.5 Time to wait on I/O for simple, short RPC calls type: TIMEDURATION, zk mutable: no, default value: 120s |
| general.security.credential.provider.paths | Available since: 1.6.1 Comma-separated list of paths to CredentialProviders type: STRING, zk mutable: no, default value: empty |
| general.server.message.size.max | Available since: 1.5.0 The maximum size of a message that can be sent to a server. type: BYTES, zk mutable: no, default value: 1G |
| general.server.threadpool.size | Available since: 2.1.0 The number of threads to use for server-internal scheduled tasks type: COUNT, zk mutable: no, default value: 1 |
| general.volume.chooser | Experimental Available since: 1.6.0 The class that will be used to select which volume will be used to create new files. type: CLASSNAME, zk mutable: no, default value: org.apache.accumulo.core.spi.fs.RandomVolumeChooser |
| instance.* | Available since: 1.3.5 Properties in this category must be consistent throughout a cloud. This is enforced and servers won’t be able to communicate if these differ. |
| instance.crypto.opts.* | Experimental Available since: 2.0.0 Properties related to on-disk file encryption. |
| instance.crypto.opts.factory | Experimental Available since: 2.1.0 The class which provides crypto services for on-disk file encryption. The default does nothing. To enable encryption, replace this classname with an implementation of theorg.apache.accumulo.core.spi.crypto.CryptoFactory interface. type: CLASSNAME, zk mutable: no, default value: org.apache.accumulo.core.spi.crypto.NoCryptoServiceFactory |
| instance.crypto.opts.sensitive.* | Experimental Available since: 2.0.0 Sensitive properties related to on-disk file encryption. |
| instance.rpc.sasl.allowed.host.impersonation | Available since: 1.7.1 One-line configuration property controlling the network locations (hostnames) that are allowed to impersonate other users type: STRING, zk mutable: no, default value: empty |
| instance.rpc.sasl.allowed.user.impersonation | Available since: 1.7.1 One-line configuration property controlling what users are allowed to impersonate other users type: STRING, zk mutable: no, default value: empty |
| instance.rpc.sasl.enabled | Available since: 1.7.0 Configures Thrift RPCs to require SASL with GSSAPI which supports Kerberos authentication. Mutually exclusive with SSL RPC configuration. type: BOOLEAN, zk mutable: no, default value: false |
| instance.rpc.ssl.clientAuth | Available since: 1.6.0 Require clients to present certs signed by a trusted root type: BOOLEAN, zk mutable: no, default value: false |
| instance.rpc.ssl.enabled | Available since: 1.6.0 Use SSL for socket connections from clients and among accumulo services. Mutually exclusive with SASL RPC configuration. type: BOOLEAN, zk mutable: no, default value: false |
| instance.secret | Available since: 1.3.5 A secret unique to a given instance that all servers must know in order to communicate with one another. It should be changed prior to the initialization of Accumulo. To change it after Accumulo has been initialized, use the ChangeSecret tool and then update accumulo.properties everywhere. Before using the ChangeSecret tool, make sure Accumulo is not running and you are logged in as the user that controls Accumulo files in HDFS. To use the ChangeSecret tool, run the command: ./bin/accumulo org.apache.accumulo.server.util.ChangeSecret type: STRING, zk mutable: no, default value: DEFAULT |
| instance.security.authenticator | Experimental Available since: 1.5.0 The authenticator class that accumulo will use to determine if a user has privilege to perform an action type: CLASSNAME, zk mutable: no, default value: org.apache.accumulo.server.security.handler.ZKAuthenticator |
| instance.security.authorizor | Experimental Available since: 1.5.0 The authorizor class that accumulo will use to determine what labels a user has privilege to see type: CLASSNAME, zk mutable: no, default value: org.apache.accumulo.server.security.handler.ZKAuthorizor |
| instance.security.permissionHandler | Experimental Available since: 1.5.0 The permission handler class that accumulo will use to determine if a user has privilege to perform an action type: CLASSNAME, zk mutable: no, default value: org.apache.accumulo.server.security.handler.ZKPermHandler |
| instance.volume.config.* | Available since: 2.1.1 Properties in this category are used to provide volume specific overrides to the general filesystem client configuration. Properties using this prefix should be in the form ‘instance.volume.config. |
| instance.volumes | Available since: 1.6.0 A comma separated list of dfs uris to use. Files will be stored across these filesystems. In some situations, the first volume in this list may be treated differently, such as being preferred for writing out temporary files (for example, when creating a pre-split table). After adding uris to this list, run ‘accumulo init –add-volume’ and then restart tservers. If entries are removed from this list then tservers will need to be restarted. After a uri is removed from the list Accumulo will not create new files in that location, however Accumulo can still reference files created at that location before the config change. To use a comma or other reserved characters in a URI use standard URI hex encoding. For example replace commas with %2C. type: STRING, zk mutable: no, default value: empty |
| instance.volumes.replacements | Available since: 1.6.0 Since accumulo stores absolute URIs changing the location of a namenode could prevent Accumulo from starting. The property helps deal with that situation. Provide a comma separated list of uri replacement pairs here if a namenode location changes. Each pair should be separated with a space. For example, if hdfs://nn1 was replaced with hdfs://nnA and hdfs://nn2 was replaced with hdfs://nnB, then set this property to ‘hdfs://nn1 hdfs://nnA,hdfs://nn2 hdfs://nnB’ Replacements must be configured for use. To see which volumes are currently in use, run ‘accumulo admin volumes -l’. To use a comma or other reserved characters in a URI use standard URI hex encoding. For example replace commas with %2C. type: STRING, zk mutable: no, default value: empty |
| instance.volumes.upgrade.relative | Available since: 2.1.0 The volume dfs uri containing relative tablet file paths. Relative paths may exist in the metadata from versions prior to 1.6. This property is only required if a relative path is detected during the upgrade process and will only be used once. type: STRING, zk mutable: no, default value: empty |
| instance.zookeeper.host | Available since: 1.3.5 Comma separated list of zookeeper servers type: HOSTLIST, zk mutable: no, default value: localhost:2181 |
| instance.zookeeper.timeout | Available since: 1.3.5 Zookeeper session timeout; max value when represented as milliseconds should be no larger than 2147483647 type: TIMEDURATION, zk mutable: no, default value: 30s |
| manager.* | Available since: 2.1.0 Properties in this category affect the behavior of the manager server. |
| manager.bulk.timeout | Available since: 2.1.0 (formerly master.bulk.timeout since 1.4.3) The time to wait for a tablet server to process a bulk import request type: TIMEDURATION, zk mutable: yes, default value: 5m |
| manager.fate.metrics.min.update.interval | Available since: 2.1.0 (formerly master.fate.metrics.min.update.interval since 1.9.3) Limit calls from metric sinks to zookeeper to update interval type: TIMEDURATION, zk mutable: yes, default value: 60s |
| manager.fate.threadpool.size | Available since: 2.1.0 (formerly master.fate.threadpool.size since 1.4.3) The number of threads used to run fault-tolerant executions (FATE). These are primarily table operations like merge. type: COUNT, zk mutable: yes, default value: 4 |
| manager.lease.recovery.interval | Available since: 2.1.0 (formerly master.lease.recovery.interval since 1.5.0) The amount of time to wait after requesting a write-ahead log to be recovered type: TIMEDURATION, zk mutable: yes, default value: 5s |
| manager.metadata.suspendable | Available since: 2.1.0 (formerly master.metadata.suspendable since 1.8.0) Allow tablets for the accumulo.metadata table to be suspended via table.suspend.duration. type: BOOLEAN, zk mutable: yes, default value: false |
| manager.port.client | Available since: 2.1.0 (formerly master.port.client since 1.3.5) The port used for handling client connections on the manager type: PORT, zk mutable: yes but requires restart of the manager, default value: 9999 |
| manager.recovery.delay | Available since: 2.1.0 (formerly master.recovery.delay since 1.5.0) When a tablet server’s lock is deleted, it takes time for it to completely quit. This delay gives it time before log recoveries begin. type: TIMEDURATION, zk mutable: yes, default value: 10s |
| manager.recovery.wal.cache.time | Available since: 2.1.2 Amount of time that the existence of recovery write-ahead logs is cached. type: TIMEDURATION, zk mutable: yes but requires restart of the manager, default value: 15s |
| manager.rename.threadpool.size | Available since: 2.1.0 The number of threads to use when renaming user files during table import or bulk ingest. type: COUNT, zk mutable: yes, default value: 20 |
| manager.server.threadcheck.time | Available since: 2.1.0 (formerly master.server.threadcheck.time since 1.4.0) The time between adjustments of the server thread pool. type: TIMEDURATION, zk mutable: yes, default value: 1s |
| manager.server.threads.minimum | Available since: 2.1.0 (formerly master.server.threads.minimum since 1.4.0) The minimum number of threads to use to handle incoming requests. type: COUNT, zk mutable: yes, default value: 20 |
| manager.server.threads.timeout | Available since: 2.1.0 The time after which incoming request threads terminate with no work available. Zero (0) will keep the threads alive indefinitely. type: TIMEDURATION, zk mutable: yes, default value: 0s |
| manager.startup.tserver.avail.max.wait | Available since: 2.1.0 (formerly master.startup.tserver.avail.max.wait since 1.10.0) Maximum time manager will wait for tserver available threshold to be reached before continuing. When set to 0 or less, will block indefinitely. Default is 0 to block indefinitely. Only valid when tserver available threshold is set greater than 0. Added with version 1.10 type: TIMEDURATION, zk mutable: yes, default value: 0 |
| manager.startup.tserver.avail.min.count | Available since: 2.1.0 (formerly master.startup.tserver.avail.min.count since 1.10.0) Minimum number of tservers that need to be registered before manager will start tablet assignment - checked at manager initialization, when manager gets lock. When set to 0 or less, no blocking occurs. Default is 0 (disabled) to keep original behaviour. Added with version 1.10 type: COUNT, zk mutable: yes, default value: 0 |
| manager.status.threadpool.size | Available since: 2.1.0 (formerly master.status.threadpool.size since 1.8.0) The number of threads to use when fetching the tablet server status for balancing. Zero indicates an unlimited number of threads will be used. type: COUNT, zk mutable: yes, default value: 0 |
| manager.tablet.balancer | Available since: 2.1.0 (formerly master.tablet.balancer since 1.3.5) The balancer class that accumulo will use to make tablet assignment and migration decisions. type: CLASSNAME, zk mutable: yes, default value: org.apache.accumulo.core.spi.balancer.TableLoadBalancer |
| manager.tablet.watcher.interval | Available since: 2.1.2 Time to wait between scanning tablet states to identify tablets that need to be assigned, un-assigned, migrated, etc. type: TIMEDURATION, zk mutable: yes, default value: 60s |
| manager.wal.closer.implementation | Available since: 2.1.0 A class that implements a mechanism to steal write access to a write-ahead log type: CLASSNAME, zk mutable: yes, default value: org.apache.accumulo.server.manager.recovery.HadoopLogCloser |
| monitor.* | Available since: 1.3.5 Properties in this category affect the behavior of the monitor web server. |
| monitor.lock.check.interval | Available since: 1.5.1 The amount of time to sleep between checking for the Monitor ZooKeeper lock type: TIMEDURATION, zk mutable: no, default value: 5s |
| monitor.port.client | Available since: 1.3.5 The listening port for the monitor’s http service type: PORT, zk mutable: no, default value: 9995 |
| monitor.resources.external | Available since: 2.0.0 A JSON Map of Strings. Each String should be an HTML tag of an external resource (JS or CSS) to be imported by the Monitor. Be sure to wrap with CDATA tags. If this value is set, all of the external resources in the <head> tag of the Monitor will be replaced with the tags set here. Be sure the jquery tag is first since other scripts will depend on it. The resources that are used by default can be seen in accumulo/server/monitor/src/main/resources/templates/default.ftltype: STRING, zk mutable: no, default value: empty |
| monitor.ssl.exclude.ciphers | Available since: 1.6.1 A comma-separated list of disallowed SSL Ciphers, see monitor.ssl.include.ciphers to allow ciphers type: STRING, zk mutable: no, default value: empty |
| monitor.ssl.include.ciphers | Available since: 1.6.1 A comma-separated list of allows SSL Ciphers, see monitor.ssl.exclude.ciphers to disallow ciphers type: STRING, zk mutable: no, default value: empty |
| monitor.ssl.include.protocols | Available since: 1.5.3 A comma-separate list of allowed SSL protocols type: STRING, zk mutable: no, default value: TLSv1.2 |
| monitor.ssl.keyPassword | Available since: 1.9.3 Optional: the password for the private key in the keyStore. When not provided, this defaults to the keystore password. type: STRING, zk mutable: no, default value: empty |
| monitor.ssl.keyStore | Available since: 1.5.0 The keystore for enabling monitor SSL. type: PATH, zk mutable: no, default value: empty |
| monitor.ssl.keyStorePassword | Available since: 1.5.0 The keystore password for enabling monitor SSL. type: STRING, zk mutable: no, default value: empty |
| monitor.ssl.keyStoreType | Available since: 1.7.0 Type of SSL keystore type: STRING, zk mutable: no, default value: jks |
| monitor.ssl.trustStore | Available since: 1.5.0 The truststore for enabling monitor SSL. type: PATH, zk mutable: no, default value: empty |
| monitor.ssl.trustStorePassword | Available since: 1.5.0 The truststore password for enabling monitor SSL. type: STRING, zk mutable: no, default value: empty |
| monitor.ssl.trustStoreType | Available since: 1.7.0 Type of SSL truststore type: STRING, zk mutable: no, default value: jks |
| rpc.* | Available since: 1.6.0 Properties in this category related to the configuration of SSL keys for RPC. See also instance.ssl.enabled |
| rpc.javax.net.ssl.keyStore | Available since: 1.6.0 Path of the keystore file for the server’s private SSL key type: PATH, zk mutable: no, default value: empty |
| rpc.javax.net.ssl.keyStorePassword | Available since: 1.6.0 Password used to encrypt the SSL private keystore. Leave blank to use the Accumulo instance secret type: STRING, zk mutable: no, default value: empty |
| rpc.javax.net.ssl.keyStoreType | Available since: 1.6.0 Type of SSL keystore type: STRING, zk mutable: no, default value: jks |
| rpc.javax.net.ssl.trustStore | Available since: 1.6.0 Path of the truststore file for the root cert type: PATH, zk mutable: no, default value: empty |
| rpc.javax.net.ssl.trustStorePassword | Available since: 1.6.0 Password used to encrypt the SSL truststore. Leave blank to use no password type: STRING, zk mutable: no, default value: empty |
| rpc.javax.net.ssl.trustStoreType | Available since: 1.6.0 Type of SSL truststore type: STRING, zk mutable: no, default value: jks |
| rpc.sasl.qop | Available since: 1.7.0 The quality of protection to be used with SASL. Valid values are ‘auth’, ‘auth-int’, and ‘auth-conf’ type: STRING, zk mutable: no, default value: auth |
| rpc.ssl.cipher.suites | Available since: 1.6.1 Comma separated list of cipher suites that can be used by accepted connections type: STRING, zk mutable: no, default value: empty |
| rpc.ssl.client.protocol | Available since: 1.6.2 The protocol used to connect to a secure server, must be in the list of enabled protocols on the server side (rpc.ssl.server.enabled.protocols) type: STRING, zk mutable: no, default value: TLSv1.2 |
| rpc.ssl.server.enabled.protocols | Available since: 1.6.2 Comma separated list of protocols that can be used to accept connections type: STRING, zk mutable: no, default value: TLSv1.2 |
| rpc.useJsse | Available since: 1.6.0 Use JSSE system properties to configure SSL rather than the rpc.javax.net.ssl.* Accumulo properties type: BOOLEAN, zk mutable: no, default value: false |
| sserver.* | Experimental Available since: 2.1.0 Properties in this category affect the behavior of the scan servers |
| sserver.cache.data.size | Experimental Available since: 2.1.0 Specifies the size of the cache for RFile data blocks on each scan server. type: MEMORY, zk mutable: no, default value: 10% |
| sserver.cache.index.size | Experimental Available since: 2.1.0 Specifies the size of the cache for RFile index blocks on each scan server. type: MEMORY, zk mutable: no, default value: 25% |
| sserver.cache.metadata.expiration | Experimental Available since: 2.1.0 The time after which cached tablet metadata will be refreshed. type: TIMEDURATION, zk mutable: no, default value: 5m |
| sserver.cache.summary.size | Experimental Available since: 2.1.0 Specifies the size of the cache for summary data on each scan server. type: MEMORY, zk mutable: no, default value: 10% |
| sserver.default.blocksize | Experimental Available since: 2.1.0 Specifies a default blocksize for the scan server caches type: BYTES, zk mutable: no, default value: 1M |
| sserver.group | Experimental Available since: 3.0.0 Optional group name that will be made available to the ScanServerSelector client plugin. Groups support at least two use cases: dedicating resources to scans and/or using different hardware for scans. type: STRING, zk mutable: no, default value: default |
| sserver.port.client | Experimental Available since: 2.1.0 The port used for handling client connections on the tablet servers type: PORT, zk mutable: no, default value: 9996 |
| sserver.port.search | Experimental Available since: 2.1.0 if the ports above are in use, search higher ports until one is available type: BOOLEAN, zk mutable: no, default value: true |
| sserver.scan.executors.* | Experimental Available since: 2.1.0 Prefix for defining executors to service scans. See scan executors for an overview of why and how to use this property. For each executor the number of threads, thread priority, and an optional prioritizer can be configured. To configure a new executor, set sserver.scan.executors.<name>.threads=<number>. Optionally, can also set sserver.scan.executors.<name>.priority=<number 1 to 10>, sserver.scan.executors.<name>.prioritizer=<class name>, and sserver.scan.executors.<name>.prioritizer.opts.<key>=<value> |
| sserver.scan.executors.default.prioritizer | Experimental Available since: 2.1.0 Prioritizer for the default scan executor. Defaults to none which results in FIFO priority. Set to a class that implements org.apache.accumulo.core.spi.scan.ScanPrioritizer to configure one. type: STRING, zk mutable: no, default value: empty |
| sserver.scan.executors.default.threads | Experimental Available since: 2.1.0 The number of threads for the scan executor that tables use by default. type: COUNT, zk mutable: no, default value: 16 |
| sserver.scan.executors.meta.threads | Experimental Available since: 2.1.0 The number of threads for the metadata table scan executor. type: COUNT, zk mutable: no, default value: 8 |
| sserver.scan.reference.expiration | Experimental Available since: 2.1.0 The amount of time a scan reference is unused before its deleted from metadata table type: TIMEDURATION, zk mutable: no, default value: 5m |
| sserver.server.message.size.max | Experimental Available since: 2.1.0 The maximum size of a message that can be sent to a scan server. type: BYTES, zk mutable: no, default value: 1G |
| sserver.server.threadcheck.time | Experimental Available since: 2.1.0 The time between adjustments of the thrift server thread pool. type: TIMEDURATION, zk mutable: no, default value: 1s |
| sserver.server.threads.minimum | Experimental Available since: 2.1.0 The minimum number of threads to use to handle incoming requests. type: COUNT, zk mutable: no, default value: 2 |
| sserver.server.threads.timeout | Experimental Available since: 2.1.0 The time after which incoming request threads terminate with no work available. Zero (0) will keep the threads alive indefinitely. type: TIMEDURATION, zk mutable: no, default value: 0s |
| table.* | Available since: 1.3.5 Properties in this category affect tablet server treatment of tablets, but can be configured on a per-table basis. Setting these properties in accumulo.properties will override the default globally for all tables and not any specific table. However, both the default and the global setting can be overridden per table using the table operations API or in the shell, which sets the overridden value in zookeeper. Restarting accumulo tablet servers after setting these properties in accumulo.properties will cause the global setting to take effect. However, you must use the API or the shell to change properties in zookeeper that are set on a table. |
| table.balancer | Available since: 1.3.5 This property can be set to allow the LoadBalanceByTable load balancer to change the called Load Balancer for this table type: STRING, zk mutable: yes, default value: org.apache.accumulo.core.spi.balancer.SimpleLoadBalancer |
| table.bloom.enabled | Available since: 1.3.5 Use bloom filters on this table. type: BOOLEAN, zk mutable: yes, default value: false |
| table.bloom.error.rate | Available since: 1.3.5 Bloom filter error rate. type: FRACTION, zk mutable: yes, default value: 0.5% |
| table.bloom.hash.type | Available since: 1.3.5 The bloom filter hash type type: STRING, zk mutable: yes, default value: murmur |
| table.bloom.key.functor | Available since: 1.3.5 A function that can transform the key prior to insertion and check of bloom filter. org.apache.accumulo.core.file.keyfunctor.RowFunctor, org.apache.accumulo.core.file.keyfunctor.ColumnFamilyFunctor, and org.apache.accumulo.core.file.keyfunctor.ColumnQualifierFunctor are allowable values. One can extend any of the above mentioned classes to perform specialized parsing of the key. type: CLASSNAME, zk mutable: yes, default value: org.apache.accumulo.core.file.keyfunctor.RowFunctor |
| table.bloom.load.threshold | Available since: 1.3.5 This number of seeks that would actually use a bloom filter must occur before a RFile’s bloom filter is loaded. Set this to zero to initiate loading of bloom filters when a RFile is opened. type: COUNT, zk mutable: yes, default value: 1 |
| table.bloom.size | Available since: 1.3.5 Bloom filter size, as number of keys. type: COUNT, zk mutable: yes, default value: 1048576 |
| table.bulk.max.tablets | Available since: 2.1.0 The maximum number of tablets allowed for one bulk import file. Value of 0 is Unlimited. This property is only enforced in the new bulk import API type: COUNT, zk mutable: yes, default value: 0 |
| table.cache.block.enable | Available since: 1.3.5 Determines whether data block cache is enabled for a table. type: BOOLEAN, zk mutable: yes, default value: false |
| table.cache.index.enable | Available since: 1.3.5 Determines whether index block cache is enabled for a table. type: BOOLEAN, zk mutable: yes, default value: true |
| table.class.loader.context | Available since: 2.1.0 The context to use for loading per-table resources, such as iterators from the configured factory in general.context.class.loader.factory.type: STRING, zk mutable: yes, default value: empty |
| table.compaction.configurer | Available since: 2.1.0 A plugin that can dynamically configure compaction output files based on input files. type: CLASSNAME, zk mutable: yes, default value: empty |
| table.compaction.configurer.opts.* | Available since: 2.1.0 Options for the table compaction configuror |
| table.compaction.dispatcher | Available since: 2.1.0 A configurable dispatcher that decides what compaction service a table should use. type: CLASSNAME, zk mutable: yes, default value: org.apache.accumulo.core.spi.compaction.SimpleCompactionDispatcher |
| table.compaction.dispatcher.opts.* | Available since: 2.1.0 Options for the table compaction dispatcher |
| table.compaction.major.output.drop.cache | Available since: 2.1.1 Setting this property to true will callFSDataOutputStream.setDropBehind(true) on the major compaction output stream. type: BOOLEAN, zk mutable: yes, default value: false |
| table.compaction.major.ratio | Available since: 1.3.5 Minimum ratio of total input size to maximum input RFile size for running a major compaction. type: FRACTION, zk mutable: yes, default value: 3 |
| table.compaction.minor.idle | Available since: 1.3.5 After a tablet has been idle (no mutations) for this time period it may have its in-memory map flushed to disk in a minor compaction. There is no guarantee an idle tablet will be compacted. type: TIMEDURATION, zk mutable: yes, default value: 5m |
| table.compaction.minor.output.drop.cache | Available since: 2.1.1 Setting this property to true will callFSDataOutputStream.setDropBehind(true) on the minor compaction output stream. type: BOOLEAN, zk mutable: yes, default value: false |
| table.compaction.selection.expiration.ms | Available since: 2.1.0 User compactions select files and are then queued for compaction, preventing these files from being used in system compactions. This timeout allows system compactions to cancel the hold queued user compactions have on files, when its queued for more than the specified time. If a system compaction cancels a hold and runs, then the user compaction can reselect and hold files after the system compaction runs. type: TIMEDURATION, zk mutable: yes, default value: 2m |
| table.compaction.selector | Available since: 2.1.0 A configurable selector for a table that can periodically select file for mandatory compaction, even if the files do not meet the compaction ratio. type: CLASSNAME, zk mutable: yes, default value: empty |
| table.compaction.selector.opts.* | Available since: 2.1.0 Options for the table compaction dispatcher |
| table.constraint.* | Available since: 1.3.5 Properties in this category are per-table properties that add constraints to a table. These properties start with the category prefix, followed by a number, and their values correspond to a fully qualified Java class that implements the Constraint interface. For example: table.constraint.1 = org.apache.accumulo.core.constraints.MyCustomConstraint and: table.constraint.2 = my.package.constraints.MySecondConstraint |
| table.crypto.opts.* | Experimental Available since: 2.1.0 Properties related to on-disk file encryption. |
| table.crypto.opts.sensitive.* | Experimental Available since: 2.1.0 Sensitive properties related to on-disk file encryption. |
| table.custom.* | Available since: 1.7.0 Prefix to be used for user defined arbitrary properties. |
| table.delete.behavior | Experimental Available since: 2.0.0 This determines what action to take when a delete marker is seen. Valid values are process and fail with process being the default. When set to process, deletes will suppress data. When set to fail, any deletes seen will cause an exception. The purpose of fail is to support tables that never delete data and need fast seeks within the timestamp range of a column. When setting this to fail, also consider configuring the org.apache.accumulo.core.data.constraints.NoDeleteConstraint constraint.type: STRING, zk mutable: yes, default value: process |
| table.durability | Available since: 1.7.0 The durability used to write to the write-ahead log. Legal values are: none, which skips the write-ahead log; log, which sends the data to the write-ahead log, but does nothing to make it durable; flush, which pushes data to the file system; and sync, which ensures the data is written to disk. type: DURABILITY, zk mutable: yes, default value: sync |
| table.failures.ignore | Available since: 1.3.5 If you want queries for your table to hang or fail when data is missing from the system, then set this to false. When this set to true missing data will be reported but queries will still run possibly returning a subset of the data. type: BOOLEAN, zk mutable: yes, default value: false |
| table.file.blocksize | Available since: 1.3.5 The HDFS block size used when writing RFiles. When set to 0B, the value/defaults of HDFS property ‘dfs.block.size’ will be used. type: BYTES, zk mutable: yes, default value: 0B |
| table.file.compress.blocksize | Available since: 1.3.5 The maximum size of data blocks in RFiles before they are compressed and written. type: BYTES, zk mutable: yes, default value: 100k |
| table.file.compress.blocksize.index | Available since: 1.4.0 The maximum size of index blocks in RFiles before they are compressed and written. type: BYTES, zk mutable: yes, default value: 128k |
| table.file.compress.type | Available since: 1.3.5 Compression algorithm used on index and data blocks before they are written. Possible values: zstd, gz, snappy, bzip2, lzo, lz4, none type: STRING, zk mutable: yes, default value: gz |
| table.file.max | Available since: 1.4.0 The maximum number of RFiles each tablet in a table can have. When adjusting this property you may want to consider adjusting table.compaction.major.ratio also. Setting this property to 0 will make it default to tserver.scan.files.open.max-1, this will prevent a tablet from having more RFiles than can be opened. Setting this property low may throttle ingest and increase query performance. type: COUNT, zk mutable: yes, default value: 15 |
| table.file.replication | Available since: 1.3.5 The number of replicas for a table’s RFiles in HDFS. When set to 0, HDFS defaults are used. type: COUNT, zk mutable: yes, default value: 0 |
| table.file.summary.maxSize | Available since: 2.0.0 The maximum size summary that will be stored. The number of RFiles that had summary data exceeding this threshold is reported by Summary.getFileStatistics().getLarge(). When adjusting this consider the expected number RFiles with summaries on each tablet server and the summary cache size. type: BYTES, zk mutable: yes, default value: 256k |
| table.file.type | Available since: 1.3.5 Change the type of file a table writes type: FILENAME_EXT, zk mutable: yes, default value: rf |
| table.formatter | Available since: 1.4.0 The Formatter class to apply on results in the shell type: STRING, zk mutable: yes, default value: org.apache.accumulo.core.util.format.DefaultFormatter |
| table.group.* | Available since: 1.3.5 Properties in this category are per-table properties that define locality groups in a table. These properties start with the category prefix, followed by a name, followed by a period, and followed by a property for that group. For example table.group.group1=x,y,z sets the column families for a group called group1. Once configured, group1 can be enabled by adding it to the list of groups in the table.groups.enabled property. Additional group options may be specified for a named group by setting table.group.<name>.opt.<key>=<value>. |
| table.groups.enabled | Available since: 1.3.5 A comma separated list of locality group names to enable for this table. type: STRING, zk mutable: yes, default value: empty |
| table.iterator.* | Available since: 1.3.5 Properties in this category specify iterators that are applied at various stages (scopes) of interaction with a table. These properties start with the category prefix, followed by a scope (minc, majc, scan, etc.), followed by a period, followed by a name, as in table.iterator.scan.vers, or table.iterator.scan.custom. The values for these properties are a number indicating the ordering in which it is applied, and a class name such as: table.iterator.scan.vers = 10,org.apache.accumulo.core.iterators.VersioningIterator These iterators can take options if additional properties are set that look like this property, but are suffixed with a period, followed by ‘opt’ followed by another period, and a property name. For example, table.iterator.minc.vers.opt.maxVersions = 3 |
| table.iterator.majc.* | Available since: 1.5.2 Convenience prefix to find options for the majc iterator scope |
| table.iterator.minc.* | Available since: 1.5.2 Convenience prefix to find options for the minc iterator scope |
| table.iterator.scan.* | Available since: 1.5.2 Convenience prefix to find options for the scan iterator scope |
| table.sampler | Available since: 1.8.0 The name of a class that implements org.apache.accumulo.core.Sampler. Setting this option enables storing a sample of data which can be scanned. Always having a current sample can useful for query optimization and data comprehension. After enabling sampling for an existing table, a compaction is needed to compute the sample for existing data. The compact command in the shell has an option to only compact RFiles without sample data. type: CLASSNAME, zk mutable: yes, default value: empty |
| table.sampler.opt.* | Available since: 1.8.0 The property is used to set options for a sampler. If a sample had two options like hasher and modulous, then the two properties table.sampler.opt.hasher=${hash algorithm} and table.sampler.opt.modulous=${mod} would be set. |
| table.scan.dispatcher | Available since: 2.0.0 This class is used to dynamically dispatch scans to configured scan executors. Configured classes must implement ScanDispatcher See scan executors for an overview of why and how to use this property. This property is ignored for the root and metadata table. The metadata table always dispatches to a scan executor named meta.type: CLASSNAME, zk mutable: yes, default value: org.apache.accumulo.core.spi.scan.SimpleScanDispatcher |
| table.scan.dispatcher.opts.* | Available since: 2.0.0 Options for the table scan dispatcher |
| table.scan.max.memory | Available since: 1.3.5 The maximum amount of memory that will be used to cache results of a client query/scan. Once this limit is reached, the buffered data is sent to the client. type: BYTES, zk mutable: yes, default value: 512k |
| table.security.scan.visibility.default | Available since: 1.3.5 The security label that will be assumed at scan time if an entry does not have a visibility expression. Note: An empty security label is displayed as []. The scan results will show an empty visibility even if the visibility from this setting is applied to the entry. CAUTION: If a particular key has an empty security label AND its table’s default visibility is also empty, access will ALWAYS be granted for users with permission to that table. Additionally, if this field is changed, all existing data with an empty visibility label will be interpreted with the new label on the next scan. type: STRING, zk mutable: yes, default value: empty |
| table.split.endrow.size.max | Available since: 1.7.0 Maximum size of end row type: BYTES, zk mutable: yes, default value: 10k |
| table.split.threshold | Available since: 1.3.5 A tablet is split when the combined size of RFiles exceeds this amount. type: BYTES, zk mutable: yes, default value: 1G |
| table.summarizer.* | Available since: 2.0.0 Prefix for configuring summarizers for a table. Using this prefix multiple summarizers can be configured with options for each one. Each summarizer configured should have a unique id, this id can be anything. To add a summarizer set table.summarizer.<unique id>=<summarizer class name>. If the summarizer has options, then for each option set table.summarizer.<unique id>.opt.<key>=<value>. |
| table.suspend.duration | Available since: 1.8.0 For tablets belonging to this table: When a tablet server dies, allow the tablet server this duration to revive before reassigning its tablets to other tablet servers. type: TIMEDURATION, zk mutable: yes, default value: 0s |
| tserver.* | Available since: 1.3.5 Properties in this category affect the behavior of the tablet servers |
| tserver.assignment.concurrent.max | Available since: 1.7.0 The number of threads available to load tablets. Recoveries are still performed serially. type: COUNT, zk mutable: yes, default value: 2 |
| tserver.assignment.duration.warning | Available since: 1.6.2 The amount of time an assignment can run before the server will print a warning along with the current stack trace. Meant to help debug stuck assignments type: TIMEDURATION, zk mutable: yes, default value: 10m |
| tserver.bloom.load.concurrent.max | Available since: 1.3.5 The number of concurrent threads that will load bloom filters in the background. Setting this to zero will make bloom filters load in the foreground. type: COUNT, zk mutable: yes, default value: 4 |
| tserver.cache.data.size | Available since: 1.3.5 Specifies the size of the cache for RFile data blocks. type: MEMORY, zk mutable: yes but requires restart of the tserver, default value: 10% |
| tserver.cache.index.size | Available since: 1.3.5 Specifies the size of the cache for RFile index blocks. type: MEMORY, zk mutable: yes but requires restart of the tserver, default value: 25% |
| tserver.cache.manager.class | Available since: 2.0.0 Specifies the class name of the block cache factory implementation. Alternative implementation is org.apache.accumulo.core.file.blockfile.cache.tinylfu.TinyLfuBlockCacheManager type: STRING, zk mutable: yes but requires restart of the tserver, default value: org.apache.accumulo.core.file.blockfile.cache.lru.LruBlockCacheManager |
| tserver.cache.summary.size | Available since: 2.0.0 Specifies the size of the cache for summary data on each tablet server. type: MEMORY, zk mutable: yes but requires restart of the tserver, default value: 10% |
| tserver.client.timeout | Available since: 1.3.5 Time to wait for clients to continue scans before closing a session. type: TIMEDURATION, zk mutable: yes, default value: 3s |
| tserver.compaction.major.delay | Available since: 1.3.5 Time a tablet server will sleep between checking which tablets need compaction. type: TIMEDURATION, zk mutable: yes, default value: 30s |
| tserver.compaction.major.service.* | Available since: 2.1.0 Prefix for compaction services. |
| tserver.compaction.major.service.default.planner | Available since: 2.1.0 Planner for default compaction service. type: CLASSNAME, zk mutable: yes, default value: org.apache.accumulo.core.spi.compaction.DefaultCompactionPlanner |
| tserver.compaction.major.service.default.planner.opts.executors | Available since: 2.1.0 See org.apache.accumulo.core.spi.compaction.DefaultCompactionPlanner type: STRING, zk mutable: yes, default value: [{"name":"small","type":"internal","maxSize":"32M","numThreads":2},{"name":"medium","type":"internal","maxSize":"128M","numThreads":2},{"name":"large","type":"internal","numThreads":2}] |
| tserver.compaction.major.service.default.planner.opts.maxOpen | Available since: 2.1.0 The maximum number of files a compaction will open type: COUNT, zk mutable: yes, default value: 10 |
| tserver.compaction.major.service.default.rate.limit | Available since: 2.1.0 Maximum number of bytes to read or write per second over all major compactions in this compaction service, or 0B for unlimited. type: BYTES, zk mutable: yes, default value: 0B |
| tserver.compaction.major.service.meta.planner | Available since: 2.1.0 Compaction planner for metadata table type: CLASSNAME, zk mutable: yes, default value: org.apache.accumulo.core.spi.compaction.DefaultCompactionPlanner |
| tserver.compaction.major.service.meta.planner.opts.executors | Available since: 2.1.0 See org.apache.accumulo.core.spi.compaction.DefaultCompactionPlanner type: STRING, zk mutable: yes, default value: [{"name":"small","type":"internal","maxSize":"32M","numThreads":2},{"name":"huge","type":"internal","numThreads":2}] |
| tserver.compaction.major.service.meta.planner.opts.maxOpen | Available since: 2.1.0 The maximum number of files a compaction will open type: COUNT, zk mutable: yes, default value: 30 |
| tserver.compaction.major.service.meta.rate.limit | Available since: 2.1.0 Maximum number of bytes to read or write per second over all major compactions in this compaction service, or 0B for unlimited. type: BYTES, zk mutable: yes, default value: 0B |
| tserver.compaction.major.service.root.planner | Available since: 2.1.0 Compaction planner for root tablet service type: CLASSNAME, zk mutable: yes, default value: org.apache.accumulo.core.spi.compaction.DefaultCompactionPlanner |
| tserver.compaction.major.service.root.planner.opts.executors | Available since: 2.1.0 See org.apache.accumulo.core.spi.compaction.DefaultCompactionPlanner type: STRING, zk mutable: yes, default value: [{"name":"small","type":"internal","maxSize":"32M","numThreads":1},{"name":"huge","type":"internal","numThreads":1}] |
| tserver.compaction.major.service.root.planner.opts.maxOpen | Available since: 2.1.0 The maximum number of files a compaction will open type: COUNT, zk mutable: yes, default value: 30 |
| tserver.compaction.major.service.root.rate.limit | Available since: 2.1.0 Maximum number of bytes to read or write per second over all major compactions in this compaction service, or 0B for unlimited. type: BYTES, zk mutable: yes, default value: 0B |
| tserver.compaction.minor.concurrent.max | Available since: 1.3.5 The maximum number of concurrent minor compactions for a tablet server type: COUNT, zk mutable: yes, default value: 4 |
| tserver.compaction.warn.time | Available since: 1.6.0 When a compaction has not made progress for this time period, a warning will be logged type: TIMEDURATION, zk mutable: yes, default value: 10m |
| tserver.default.blocksize | Available since: 1.3.5 Specifies a default blocksize for the tserver caches type: BYTES, zk mutable: yes, default value: 1M |
| tserver.dir.memdump | Available since: 1.3.5 A long running scan could possibly hold memory that has been minor compacted. To prevent this, the in memory map is dumped to a local file and the scan is switched to that local file. We can not switch to the minor compacted file because it may have been modified by iterators. The file dumped to the local dir is an exact copy of what was in memory. type: PATH, zk mutable: yes, default value: /tmp |
| tserver.files.open.idle | Available since: 1.3.5 Tablet servers leave previously used RFiles open for future queries. This setting determines how much time an unused RFile should be kept open until it is closed. type: TIMEDURATION, zk mutable: yes, default value: 1m |
| tserver.health.check.interval | Available since: 2.1.0 The time between tablet server health checks. type: TIMEDURATION, zk mutable: yes, default value: 30m |
| tserver.hold.time.max | Available since: 1.4.0 The maximum time for a tablet server to be in the “memory full” state. If the tablet server cannot write out memory in this much time, it will assume there is some failure local to its node, and quit. A value of zero is equivalent to forever. type: TIMEDURATION, zk mutable: yes, default value: 5m |
| tserver.last.location.mode | Available since: 2.1.1 Describes how the system will record the ‘last’ location for tablets, which can be used for assigning them when a cluster restarts. If ‘compaction’ is the mode, then the system will record the location where the tablet’s most recent compaction occurred. If ‘assignment’ is the mode, then the most recently assigned location will be recorded. The manager.startup.tserver properties might also need to be set to ensure the tserver is available before tablets are initially assigned if the ‘last’ location is to be used. type: LAST_LOCATION_MODE, zk mutable: yes, default value: compaction |
| tserver.log.busy.tablets.count | Available since: 1.10.0 Number of busiest tablets to log. Logged at interval controlled by tserver.log.busy.tablets.interval. If <= 0, logging of busy tablets is disabled type: COUNT, zk mutable: yes, default value: 0 |
| tserver.log.busy.tablets.interval | Available since: 1.10.0 Time interval between logging out busy tablets information. type: TIMEDURATION, zk mutable: yes, default value: 1h |
| tserver.memory.maps.max | Available since: 1.3.5 Maximum amount of memory that can be used to buffer data written to a tablet server. There are two other properties that can effectively limit memory usage table.compaction.minor.logs.threshold and tserver.wal.max.size. Ensure that table.compaction.minor.logs.threshold * tserver.wal.max.size >= this property. type: MEMORY, zk mutable: yes, default value: 33% |
| tserver.memory.maps.native.enabled | Available since: 1.3.5 An in-memory data store for accumulo implemented in c++ that increases the amount of data accumulo can hold in memory and avoids Java GC pauses. type: BOOLEAN, zk mutable: yes but requires restart of the tserver, default value: true |
| tserver.migrations.concurrent.max | Available since: 1.3.5 The maximum number of concurrent tablet migrations for a tablet server type: COUNT, zk mutable: yes, default value: 1 |
| tserver.port.client | Available since: 1.3.5 The port used for handling client connections on the tablet servers type: PORT, zk mutable: yes but requires restart of the tserver, default value: 9997 |
| tserver.port.search | Available since: 1.3.5 if the ports above are in use, search higher ports until one is available type: BOOLEAN, zk mutable: yes, default value: false |
| tserver.scan.executors.* | Available since: 2.0.0 Prefix for defining executors to service scans. See scan executors for an overview of why and how to use this property. For each executor the number of threads, thread priority, and an optional prioritizer can be configured. To configure a new executor, set tserver.scan.executors.<name>.threads=<number>. Optionally, can also set tserver.scan.executors.<name>.priority=<number 1 to 10>, tserver.scan.executors.<name>.prioritizer=<class name>, and tserver.scan.executors.<name>.prioritizer.opts.<key>=<value> |
| tserver.scan.executors.default.prioritizer | Available since: 2.0.0 Prioritizer for the default scan executor. Defaults to none which results in FIFO priority. Set to a class that implements org.apache.accumulo.core.spi.scan.ScanPrioritizer to configure one. type: STRING, zk mutable: yes, default value: empty |
| tserver.scan.executors.default.threads | Available since: 2.0.0 The number of threads for the scan executor that tables use by default. type: COUNT, zk mutable: yes, default value: 16 |
| tserver.scan.executors.meta.threads | Available since: 2.0.0 The number of threads for the metadata table scan executor. type: COUNT, zk mutable: yes, default value: 8 |
| tserver.scan.files.open.max | Available since: 1.4.0 Maximum total RFiles that all tablets in a tablet server can open for scans. type: COUNT, zk mutable: yes but requires restart of the tserver, default value: 100 |
| tserver.scan.results.max.timeout | Available since: 2.1.0 Max time for the thrift client handler to wait for scan results before timing out. type: TIMEDURATION, zk mutable: yes, default value: 1s |
| tserver.server.message.size.max | Available since: 1.6.0 The maximum size of a message that can be sent to a tablet server. type: BYTES, zk mutable: yes, default value: 1G |
| tserver.server.threadcheck.time | Available since: 1.4.0 The time between adjustments of the server thread pool. type: TIMEDURATION, zk mutable: yes, default value: 1s |
| tserver.server.threads.minimum | Available since: 1.4.0 The minimum number of threads to use to handle incoming requests. type: COUNT, zk mutable: yes, default value: 20 |
| tserver.server.threads.timeout | Available since: 2.1.0 The time after which incoming request threads terminate with no work available. Zero (0) will keep the threads alive indefinitely. type: TIMEDURATION, zk mutable: yes, default value: 0s |
| tserver.session.idle.max | Available since: 1.3.5 When a tablet server’s SimpleTimer thread triggers to check idle sessions, this configurable option will be used to evaluate scan sessions to determine if they can be closed due to inactivity type: TIMEDURATION, zk mutable: yes, default value: 1m |
| tserver.session.update.idle.max | Available since: 1.6.5 When a tablet server’s SimpleTimer thread triggers to check idle sessions, this configurable option will be used to evaluate update sessions to determine if they can be closed due to inactivity type: TIMEDURATION, zk mutable: yes, default value: 1m |
| tserver.slow.filepermit.time | Available since: 1.9.3 If a thread blocks more than this period of time waiting to get file permits, debugging information will be written. type: TIMEDURATION, zk mutable: yes, default value: 100ms |
| tserver.slow.flush.time | Available since: 1.8.0 If a flush to the write-ahead log takes longer than this period of time, debugging information will written, and may result in a log rollover. type: TIMEDURATION, zk mutable: yes, default value: 100ms |
| tserver.summary.partition.threads | Available since: 2.0.0 Summary data must be retrieved from RFiles. For a large number of RFiles, the files are broken into partitions of 100k files. This setting determines how many of these groups of 100k RFiles will be processed concurrently. type: COUNT, zk mutable: yes, default value: 10 |
| tserver.summary.remote.threads | Available since: 2.0.0 For a partitioned group of 100k RFiles, those files are grouped by tablet server. Then a remote tablet server is asked to gather summary data. This setting determines how many concurrent request are made per partition. type: COUNT, zk mutable: yes, default value: 128 |
| tserver.summary.retrieval.threads | Available since: 2.0.0 The number of threads on each tablet server available to retrieve summary data, that is not currently in cache, from RFiles. type: COUNT, zk mutable: yes, default value: 10 |
| tserver.tablet.split.midpoint.files.max | Available since: 1.3.5 To find a tablets split points, all RFiles are opened and their indexes are read. This setting determines how many RFiles can be opened at once. When there are more RFiles than this setting multiple passes must be made, which is slower. However opening too many RFiles at once can cause problems. type: COUNT, zk mutable: yes, default value: 300 |
| tserver.total.mutation.queue.max | Available since: 1.7.0 The amount of memory used to store write-ahead-log mutations before flushing them. type: MEMORY, zk mutable: yes, default value: 5% |
| tserver.wal.blocksize | Available since: 1.5.0 The size of the HDFS blocks used to write to the Write-Ahead log. If zero, it will be 110% of tserver.wal.max.size (that is, try to use just one block) type: BYTES, zk mutable: yes, default value: 0 |
| tserver.wal.max.age | Available since: 2.1.0 The maximum age for each write-ahead log. type: TIMEDURATION, zk mutable: yes, default value: 24h |
| tserver.wal.max.referenced | Available since: 2.1.0 When a tablet server has more than this many write ahead logs, any tablet referencing older logs over this threshold is minor compacted. Also any tablet referencing this many logs or more will be compacted. type: COUNT, zk mutable: yes, default value: 3 |
| tserver.wal.max.size | Available since: 2.1.0 The maximum size for each write-ahead log. See comment for property tserver.memory.maps.max type: BYTES, zk mutable: yes, default value: 1G |
| tserver.wal.maximum.wait.duration | Available since: 2.1.0 The maximum amount of time to wait after a failure to create or write a write-ahead log. type: TIMEDURATION, zk mutable: yes, default value: 5m |
| tserver.wal.replication | Available since: 1.5.0 The replication to use when writing the Write-Ahead log to HDFS. If zero, it will use the HDFS default replication setting. type: COUNT, zk mutable: yes, default value: 0 |
| tserver.wal.sort.buffer.size | Available since: 2.1.0 The amount of memory to use when sorting logs during recovery. type: MEMORY, zk mutable: yes, default value: 10% |
| tserver.wal.sort.concurrent.max | Available since: 2.1.0 The maximum number of threads to use to sort logs during recovery type: COUNT, zk mutable: yes, default value: 2 |
| tserver.wal.sort.file.* | Available since: 2.1.0 The rfile properties to use when sorting logs during recovery. Most of the properties that begin with ‘table.file’ can be used here. For example, to set the compression of the sorted recovery files to snappy use ‘tserver.wal.sort.file.compress.type=snappy’ |
| tserver.wal.sync | Available since: 1.5.0 Use the SYNC_BLOCK create flag to sync WAL writes to disk. Prevents problems recovering from sudden system resets. type: BOOLEAN, zk mutable: yes, default value: true |
| tserver.wal.tolerated.creation.failures | Available since: 2.1.0 The maximum number of failures tolerated when creating a new write-ahead log. Negative values will allow unlimited creation failures. Exceeding this number of failures consecutively trying to create a new write-ahead log causes the TabletServer to exit. type: COUNT, zk mutable: yes, default value: 50 |
| tserver.wal.tolerated.wait.increment | Available since: 2.1.0 The amount of time to wait between failures to create or write a write-ahead log. type: TIMEDURATION, zk mutable: yes, default value: 1000ms |
| tserver.workq.threads | Available since: 1.4.2 The number of threads for the distributed work queue. These threads are used for copying failed bulk import RFiles. type: COUNT, zk mutable: yes, default value: 2 |
Property Types
| Type | Description |
|---|---|
| duration | A non-negative integer optionally followed by a unit of time (whitespace disallowed), as in 30s. If no unit of time is specified, seconds are assumed. Valid units are ‘ms’, ‘s’, ‘m’, ‘h’ for milliseconds, seconds, minutes, and hours. Examples of valid durations are ‘600’, ’30s’, ‘45m’, ‘30000ms’, ‘3d’, and ‘1h’. Examples of invalid durations are ‘1w’, ‘1h30m’, ‘1s 200ms’, ‘ms’, ‘’, and ‘a’. Unless otherwise stated, the max value for the duration represented in milliseconds is 9223372036854775807 |
| bytes | A positive integer optionally followed by a unit of memory (whitespace disallowed). If no unit is specified, bytes are assumed. Valid units are ‘B’, ‘K’, ‘M’ or ‘G’ for bytes, kilobytes, megabytes, gigabytes. Examples of valid memories are ‘1024’, ‘20B’, ‘100K’, ‘1500M’, ‘2G’, ‘20%’. Examples of invalid memories are ‘1M500K’, ‘1M 2K’, ‘1MB’, ‘1.5G’, ‘1,024K’, ‘’, and ‘a’. Unless otherwise stated, the max value for the memory represented in bytes is 9223372036854775807 |
| memory | A positive integer optionally followed by a unit of memory or a percentage (whitespace disallowed). If a percentage is specified, memory will be a percentage of the max memory allocated to a Java process (set by the JVM option -Xmx). If no unit is specified, bytes are assumed. Valid units are ‘B’, ‘K’, ‘M’, ‘G’, ‘%’ for bytes, kilobytes, megabytes, gigabytes, and percentage. Examples of valid memories are ‘1024’, ‘20B’, ‘100K’, ‘1500M’, ‘2G’, ‘20%’. Examples of invalid memories are ‘1M500K’, ‘1M 2K’, ‘1MB’, ‘1.5G’, ‘1,024K’, ‘’, and ‘a’. Unless otherwise stated, the max value for the memory represented in bytes is 9223372036854775807 |
| host list | A comma-separated list of hostnames or ip addresses, with optional port numbers. Examples of valid host lists are ‘localhost:2000,www.example.com,10.10.1.1:500’ and ‘localhost’. Examples of invalid host lists are ‘’, ‘:1000’, and ‘localhost:80000’ |
| port | An positive integer in the range 1024-65535 (not already in use or specified elsewhere in the configuration), zero to indicate any open ephemeral port, or a range of positive integers specified as M-N |
| count | A non-negative integer in the range of 0-2147483647 |
| fraction/percentage | A floating point number that represents either a fraction or, if suffixed with the ‘%’ character, a percentage. Examples of valid fractions/percentages are ‘10’, ‘1000%’, ‘0.05’, ‘5%’, ‘0.2%’, ‘0.0005’. Examples of invalid fractions/percentages are ‘’, ‘10 percent’, ‘Hulk Hogan’ |
| path | A string that represents a filesystem path, which can be either relative or absolute to some directory. The filesystem depends on the property. Substitutions of the ACCUMULO_HOME environment variable can be done in the system config file using ‘${env:ACCUMULO_HOME}’ or similar. |
| absolute path | An absolute filesystem path. The filesystem depends on the property. This is the same as path, but enforces that its root is explicitly specified. |
| java class | A fully qualified java class name representing a class on the classpath. An example is ‘java.lang.String’, rather than ‘String’ |
| java class list | A list of fully qualified java class names representing classes on the classpath. An example is ‘java.lang.String’, rather than ‘String’ |
| durability | One of ‘none’, ‘log’, ‘flush’ or ‘sync’. |
| gc_post_action | One of ‘none’, ‘flush’, or ‘compact’. |
| last_location_mode | Defines how to update the last location. One of ‘assignment’, or ‘compaction’. |
| string | An arbitrary string of characters whose format is unspecified and interpreted based on the context of the property to which it applies. |
| boolean | Has a value of either ‘true’ or ‘false’ (case-insensitive) |
| uri | A valid URI |
| file name extension | One of the currently supported filename extensions for storing table data files. Currently, only rf is supported. |
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