org.apache.accumulo.core.client.mapred

Class AbstractInputFormat<K,V>

java.lang.Object

org.apache.accumulo.core.client.mapred.AbstractInputFormat<K,V>

All Implemented Interfaces:

org.apache.hadoop.mapred.InputFormat<K,V>

Direct Known Subclasses:

AccumuloMultiTableInputFormat, InputFormatBase

public abstract class AbstractInputFormat<K,V>
extends Object
implements org.apache.hadoop.mapred.InputFormat<K,V>

An abstract input format to provide shared methods common to all other input format classes. At the very least, any classes inheriting from this class will need to define their own RecordReader.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	AbstractInputFormat.AbstractRecordReader<K,V> An abstract base class to be used to create RecordReader instances that convert from Accumulo Key/Value pairs to the user's K/V types.

Field Summary

Fields

Modifier and Type	Field and Description
protected static Class<?>	CLASS
protected static org.apache.log4j.Logger	log

Constructor Summary

Constructors

Constructor and Description
AbstractInputFormat()

Method Summary

Modifier and Type	Method and Description
protected static AuthenticationToken	getAuthenticationToken(org.apache.hadoop.mapred.JobConf job) Gets the authenticated token from either the specified token file or directly from the configuration, whichever was used when the job was configured.
static String	getClassLoaderContext(org.apache.hadoop.mapred.JobConf job) Returns the name of the current classloader context set on this scanner
protected static ClientConfiguration	getClientConfiguration(org.apache.hadoop.mapred.JobConf job) Fetch the client configuration from the job.
static InputTableConfig	getInputTableConfig(org.apache.hadoop.mapred.JobConf job, String tableName) Fetches a InputTableConfig that has been set on the configuration for a specific table.
static Map<String,InputTableConfig>	getInputTableConfigs(org.apache.hadoop.mapred.JobConf job) Fetches all InputTableConfigs that have been set on the given Hadoop job.
protected static Instance	getInstance(org.apache.hadoop.mapred.JobConf job) Initializes an Accumulo Instance based on the configuration.
protected static org.apache.log4j.Level	getLogLevel(org.apache.hadoop.mapred.JobConf job) Gets the log level from this configuration.
protected static String	getPrincipal(org.apache.hadoop.mapred.JobConf job) Gets the user name from the configuration.
protected static Authorizations	getScanAuthorizations(org.apache.hadoop.mapred.JobConf job) Gets the authorizations to set for the scans from the configuration.
org.apache.hadoop.mapred.InputSplit[]	getSplits(org.apache.hadoop.mapred.JobConf job, int numSplits) Gets the splits of the tables that have been set on the job by reading the metadata table for the specified ranges.
protected static org.apache.accumulo.core.client.impl.TabletLocator	getTabletLocator(org.apache.hadoop.mapred.JobConf job, String tableId) Deprecated. since 1.7.0 This method returns a type that is not part of the public API and is not guaranteed to be stable. The method was deprecated to discourage its use.
protected static Boolean	isConnectorInfoSet(org.apache.hadoop.mapred.JobConf job) Determines if the connector has been configured.
static void	setClassLoaderContext(org.apache.hadoop.mapred.JobConf job, String context) Sets the name of the classloader context on this scanner
static void	setConnectorInfo(org.apache.hadoop.mapred.JobConf job, String principal, AuthenticationToken token) Sets the connector information needed to communicate with Accumulo in this job.
static void	setConnectorInfo(org.apache.hadoop.mapred.JobConf job, String principal, String tokenFile) Sets the connector information needed to communicate with Accumulo in this job.
static void	setLogLevel(org.apache.hadoop.mapred.JobConf job, org.apache.log4j.Level level) Sets the log level for this job.
static void	setMockInstance(org.apache.hadoop.mapred.JobConf job, String instanceName) Deprecated. since 1.8.0; use MiniAccumuloCluster or a standard mock framework
static void	setScanAuthorizations(org.apache.hadoop.mapred.JobConf job, Authorizations auths) Sets the Authorizations used to scan.
static void	setZooKeeperInstance(org.apache.hadoop.mapred.JobConf job, ClientConfiguration clientConfig) Configures a ZooKeeperInstance for this job.
static void	setZooKeeperInstance(org.apache.hadoop.mapred.JobConf job, String instanceName, String zooKeepers) Deprecated. since 1.6.0; Use setZooKeeperInstance(JobConf, ClientConfiguration) instead.
protected static void	validateOptions(org.apache.hadoop.mapred.JobConf job) Check whether a configuration is fully configured to be used with an Accumulo InputFormat.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.hadoop.mapred.InputFormat

getRecordReader

Field Detail

CLASS

protected static final Class<?> CLASS

log

protected static final org.apache.log4j.Logger log

Constructor Detail

AbstractInputFormat

public AbstractInputFormat()

Method Detail

setClassLoaderContext

public static void setClassLoaderContext(org.apache.hadoop.mapred.JobConf job,
                                         String context)

Sets the name of the classloader context on this scanner

Parameters:

job - the Hadoop job instance to be configured

context - name of the classloader context

Since:

1.8.0

getClassLoaderContext

public static String getClassLoaderContext(org.apache.hadoop.mapred.JobConf job)

Returns the name of the current classloader context set on this scanner

Parameters:

job - the Hadoop job instance to be configured

Returns:

name of the current context

Since:

1.8.0

setConnectorInfo

public static void setConnectorInfo(org.apache.hadoop.mapred.JobConf job,
                                    String principal,
                                    AuthenticationToken token)
                             throws AccumuloSecurityException

Sets the connector information needed to communicate with Accumulo in this job.

WARNING: Some tokens, when serialized, divulge sensitive information in the configuration as a means to pass the token to MapReduce tasks. This information is BASE64 encoded to provide a charset safe conversion to a string, but this conversion is not intended to be secure. PasswordToken is one example that is insecure in this way; however DelegationTokens, acquired using SecurityOperations.getDelegationToken(DelegationTokenConfig), is not subject to this concern.

Parameters:

job - the Hadoop job instance to be configured

principal - a valid Accumulo user name (user must have Table.CREATE permission)

token - the user's password

Throws:

AccumuloSecurityException

Since:

1.5.0

setConnectorInfo

public static void setConnectorInfo(org.apache.hadoop.mapred.JobConf job,
                                    String principal,
                                    String tokenFile)
                             throws AccumuloSecurityException

Sets the connector information needed to communicate with Accumulo in this job.

Stores the password in a file in HDFS and pulls that into the Distributed Cache in an attempt to be more secure than storing it in the Configuration.

Parameters:

job - the Hadoop job instance to be configured

principal - a valid Accumulo user name (user must have Table.CREATE permission)

tokenFile - the path to the token file

Throws:

AccumuloSecurityException

Since:

1.6.0

isConnectorInfoSet

protected static Boolean isConnectorInfoSet(org.apache.hadoop.mapred.JobConf job)

Determines if the connector has been configured.

Parameters:

job - the Hadoop context for the configured job

Returns:

true if the connector has been configured, false otherwise

Since:

1.5.0

See Also:

setConnectorInfo(JobConf, String, AuthenticationToken)

getPrincipal

protected static String getPrincipal(org.apache.hadoop.mapred.JobConf job)

Gets the user name from the configuration.

Parameters:

job - the Hadoop context for the configured job

Returns:

the user name

Since:

1.5.0

See Also:

setConnectorInfo(JobConf, String, AuthenticationToken)

getAuthenticationToken

protected static AuthenticationToken getAuthenticationToken(org.apache.hadoop.mapred.JobConf job)

Gets the authenticated token from either the specified token file or directly from the configuration, whichever was used when the job was configured.

Parameters:

job - the Hadoop context for the configured job

Returns:

the principal's authentication token

Since:

1.6.0

See Also:

setConnectorInfo(JobConf, String, AuthenticationToken), setConnectorInfo(JobConf, String, String)

setZooKeeperInstance

@Deprecated
public static void setZooKeeperInstance(org.apache.hadoop.mapred.JobConf job,
                                                    String instanceName,
                                                    String zooKeepers)

Deprecated. since 1.6.0; Use setZooKeeperInstance(JobConf, ClientConfiguration) instead.

Configures a ZooKeeperInstance for this job.

Parameters:

job - the Hadoop job instance to be configured

instanceName - the Accumulo instance name

zooKeepers - a comma-separated list of zookeeper servers

Since:

1.5.0

setZooKeeperInstance

public static void setZooKeeperInstance(org.apache.hadoop.mapred.JobConf job,
                                        ClientConfiguration clientConfig)

Configures a ZooKeeperInstance for this job.

Parameters:

job - the Hadoop job instance to be configured

clientConfig - client configuration containing connection options

Since:

1.6.0

setMockInstance

@Deprecated
public static void setMockInstance(org.apache.hadoop.mapred.JobConf job,
                                               String instanceName)

Deprecated. since 1.8.0; use MiniAccumuloCluster or a standard mock framework

Configures a MockInstance for this job.

Parameters:

job - the Hadoop job instance to be configured

instanceName - the Accumulo instance name

Since:

1.5.0

getInstance

protected static Instance getInstance(org.apache.hadoop.mapred.JobConf job)

Initializes an Accumulo Instance based on the configuration.

Parameters:

job - the Hadoop context for the configured job

Returns:

an Accumulo instance

Since:

1.5.0

See Also:

setZooKeeperInstance(JobConf, ClientConfiguration)

setLogLevel

public static void setLogLevel(org.apache.hadoop.mapred.JobConf job,
                               org.apache.log4j.Level level)

Sets the log level for this job.

Parameters:

job - the Hadoop job instance to be configured

level - the logging level

Since:

1.5.0

getLogLevel

protected static org.apache.log4j.Level getLogLevel(org.apache.hadoop.mapred.JobConf job)

Gets the log level from this configuration.

Parameters:

job - the Hadoop context for the configured job

Returns:

the log level

Since:

1.5.0

See Also:

setLogLevel(JobConf, Level)

setScanAuthorizations

public static void setScanAuthorizations(org.apache.hadoop.mapred.JobConf job,
                                         Authorizations auths)

Sets the Authorizations used to scan. Must be a subset of the user's authorization. Defaults to the empty set.

Parameters:

job - the Hadoop job instance to be configured

auths - the user's authorizations

Since:

1.5.0

getScanAuthorizations

protected static Authorizations getScanAuthorizations(org.apache.hadoop.mapred.JobConf job)

Gets the authorizations to set for the scans from the configuration.

Parameters:

job - the Hadoop context for the configured job

Returns:

the Accumulo scan authorizations

Since:

1.5.0

See Also:

setScanAuthorizations(JobConf, Authorizations)

getTabletLocator

@Deprecated
protected static org.apache.accumulo.core.client.impl.TabletLocator getTabletLocator(org.apache.hadoop.mapred.JobConf job,
                                                                                                 String tableId)
                                                                                          throws TableNotFoundException

Deprecated. since 1.7.0 This method returns a type that is not part of the public API and is not guaranteed to be stable. The method was deprecated to discourage its use.

Initializes an Accumulo TabletLocator based on the configuration.

Parameters:

job - the Hadoop context for the configured job

Returns:

an Accumulo tablet locator

Throws:

TableNotFoundException - if the table name set on the configuration doesn't exist

Since:

1.6.0

getClientConfiguration

protected static ClientConfiguration getClientConfiguration(org.apache.hadoop.mapred.JobConf job)

Fetch the client configuration from the job.

Parameters:

job - The job

Returns:

The client configuration for the job

Since:

1.7.0

validateOptions

protected static void validateOptions(org.apache.hadoop.mapred.JobConf job)
                               throws IOException

Check whether a configuration is fully configured to be used with an Accumulo InputFormat.

Parameters:

job - the Hadoop context for the configured job

Throws:

IOException - if the context is improperly configured

Since:

1.5.0

getInputTableConfigs

public static Map<String,InputTableConfig> getInputTableConfigs(org.apache.hadoop.mapred.JobConf job)

Fetches all InputTableConfigs that have been set on the given Hadoop job.

Parameters:

job - the Hadoop job instance to be configured

Returns:

the InputTableConfig objects set on the job

Since:

1.6.0

getInputTableConfig

public static InputTableConfig getInputTableConfig(org.apache.hadoop.mapred.JobConf job,
                                                   String tableName)

Fetches a InputTableConfig that has been set on the configuration for a specific table.

null is returned in the event that the table doesn't exist.

Parameters:

job - the Hadoop job instance to be configured

tableName - the table name for which to grab the config object

Returns:

the InputTableConfig for the given table

Since:

1.6.0

getSplits

public org.apache.hadoop.mapred.InputSplit[] getSplits(org.apache.hadoop.mapred.JobConf job,
                                                       int numSplits)
                                                throws IOException

Gets the splits of the tables that have been set on the job by reading the metadata table for the specified ranges.

Specified by:

getSplits in interface org.apache.hadoop.mapred.InputFormat<K,V>

Returns:

the splits from the tables based on the ranges.

Throws:

IOException - if a table set on the job doesn't exist or an error occurs initializing the tablet locator