org.apache.accumulo.core.client.mapred

Class AccumuloOutputFormat

java.lang.Object

org.apache.accumulo.core.client.mapred.AccumuloOutputFormat

All Implemented Interfaces:

org.apache.hadoop.mapred.OutputFormat<org.apache.hadoop.io.Text,Mutation>

public class AccumuloOutputFormat
extends Object
implements org.apache.hadoop.mapred.OutputFormat<org.apache.hadoop.io.Text,Mutation>

This class allows MapReduce jobs to use Accumulo as the sink for data. This OutputFormat accepts keys and values of type Text (for a table name) and Mutation from the Map and Reduce functions. The user must specify the following via static configurator methods:

• setConnectorInfo(JobConf, String, AuthenticationToken)
• setZooKeeperInstance(JobConf, String, String) OR setMockInstance(JobConf, String)

Other static methods are optional.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	AccumuloOutputFormat.AccumuloRecordWriter A base class to be used to create RecordWriter instances that write to Accumulo.

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.apache.log4j.Logger	log

Constructor Summary

Constructors

Constructor and Description
AccumuloOutputFormat()

Method Summary

Methods

Modifier and Type	Method and Description
protected static Boolean	canCreateTables(org.apache.hadoop.mapred.JobConf job) Determines whether tables are permitted to be created as needed.
void	checkOutputSpecs(org.apache.hadoop.fs.FileSystem ignored, org.apache.hadoop.mapred.JobConf job)
protected static BatchWriterConfig	getBatchWriterOptions(org.apache.hadoop.mapred.JobConf job) Gets the BatchWriterConfig settings.
protected static String	getDefaultTableName(org.apache.hadoop.mapred.JobConf job) Gets the default table name from the configuration.
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 principal from the configuration.
org.apache.hadoop.mapred.RecordWriter<org.apache.hadoop.io.Text,Mutation>	getRecordWriter(org.apache.hadoop.fs.FileSystem ignored, org.apache.hadoop.mapred.JobConf job, String name, org.apache.hadoop.util.Progressable progress)
protected static Boolean	getSimulationMode(org.apache.hadoop.mapred.JobConf job) Determines whether this feature is enabled.
protected static byte[]	getToken(org.apache.hadoop.mapred.JobConf job) Gets the password from the configuration.
protected static String	getTokenClass(org.apache.hadoop.mapred.JobConf job) Gets the serialized token class from the configuration.
protected static Boolean	isConnectorInfoSet(org.apache.hadoop.mapred.JobConf job) Determines if the connector has been configured.
static void	setBatchWriterOptions(org.apache.hadoop.mapred.JobConf job, BatchWriterConfig bwConfig) Sets the configuration for for the job's BatchWriter instances.
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	setCreateTables(org.apache.hadoop.mapred.JobConf job, boolean enableFeature) Sets the directive to create new tables, as necessary.
static void	setDefaultTableName(org.apache.hadoop.mapred.JobConf job, String tableName) Sets the default table name to use if one emits a null in place of a table name for a given mutation.
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) Configures a MockInstance for this job.
static void	setSimulationMode(org.apache.hadoop.mapred.JobConf job, boolean enableFeature) Sets the directive to use simulation mode for this job.
static void	setZooKeeperInstance(org.apache.hadoop.mapred.JobConf job, String instanceName, String zooKeepers) Configures a ZooKeeperInstance for this job.

Methods inherited from class java.lang.Object

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

Field Detail

log

protected static final org.apache.log4j.Logger log

Constructor Detail

AccumuloOutputFormat

public AccumuloOutputFormat()

Method Detail

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: The serialized token is stored in the configuration and shared with all MapReduce tasks. It is BASE64 encoded to provide a charset safe conversion to a string, and is not intended to be secure.

Parameters:

job - the Hadoop job instance to be configured

principal - a valid Accumulo user name (user must have Table.CREATE permission if setCreateTables(JobConf, boolean) is set to true)

token - the user's password

Throws:

AccumuloSecurityException

Since:

1.5.0

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 principal 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)

getTokenClass

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

Gets the serialized token class 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)

getToken

protected static byte[] getToken(org.apache.hadoop.mapred.JobConf job)

Gets the password from the configuration. WARNING: The password is stored in the Configuration and shared with all MapReduce tasks; It is BASE64 encoded to provide a charset safe conversion to a string, and is not intended to be secure.

Parameters:

job - the Hadoop context for the configured job

Returns:

the decoded user password

Since:

1.5.0

See Also:

setConnectorInfo(JobConf, String, AuthenticationToken)

setZooKeeperInstance

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

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

setMockInstance

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

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, String, String), setMockInstance(JobConf, String)

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)

setDefaultTableName

public static void setDefaultTableName(org.apache.hadoop.mapred.JobConf job,
                       String tableName)

Sets the default table name to use if one emits a null in place of a table name for a given mutation. Table names can only be alpha-numeric and underscores.

Parameters:

job - the Hadoop job instance to be configured

tableName - the table to use when the tablename is null in the write call

Since:

1.5.0

getDefaultTableName

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

Gets the default table name from the configuration.

Parameters:

job - the Hadoop context for the configured job

Returns:

the default table name

Since:

1.5.0

See Also:

setDefaultTableName(JobConf, String)

setBatchWriterOptions

public static void setBatchWriterOptions(org.apache.hadoop.mapred.JobConf job,
                         BatchWriterConfig bwConfig)

Sets the configuration for for the job's BatchWriter instances. If not set, a new BatchWriterConfig, with sensible built-in defaults is used. Setting the configuration multiple times overwrites any previous configuration.

Parameters:

job - the Hadoop job instance to be configured

bwConfig - the configuration for the BatchWriter

Since:

1.5.0

getBatchWriterOptions

protected static BatchWriterConfig getBatchWriterOptions(org.apache.hadoop.mapred.JobConf job)

Gets the BatchWriterConfig settings.

Parameters:

job - the Hadoop context for the configured job

Returns:

the configuration object

Since:

1.5.0

See Also:

setBatchWriterOptions(JobConf, BatchWriterConfig)

setCreateTables

public static void setCreateTables(org.apache.hadoop.mapred.JobConf job,
                   boolean enableFeature)

Sets the directive to create new tables, as necessary. Table names can only be alpha-numeric and underscores.

By default, this feature is disabled.

Parameters:

job - the Hadoop job instance to be configured

enableFeature - the feature is enabled if true, disabled otherwise

Since:

1.5.0

canCreateTables

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

Determines whether tables are permitted to be created as needed.

Parameters:

job - the Hadoop context for the configured job

Returns:

true if the feature is disabled, false otherwise

Since:

1.5.0

See Also:

setCreateTables(JobConf, boolean)

setSimulationMode

public static void setSimulationMode(org.apache.hadoop.mapred.JobConf job,
                     boolean enableFeature)

Sets the directive to use simulation mode for this job. In simulation mode, no output is produced. This is useful for testing.

By default, this feature is disabled.

Parameters:

job - the Hadoop job instance to be configured

enableFeature - the feature is enabled if true, disabled otherwise

Since:

1.5.0

getSimulationMode

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

Determines whether this feature is enabled.

Parameters:

job - the Hadoop context for the configured job

Returns:

true if the feature is enabled, false otherwise

Since:

1.5.0

See Also:

setSimulationMode(JobConf, boolean)

checkOutputSpecs

public void checkOutputSpecs(org.apache.hadoop.fs.FileSystem ignored,
                    org.apache.hadoop.mapred.JobConf job)
                      throws IOException

Specified by:

checkOutputSpecs in interface org.apache.hadoop.mapred.OutputFormat<org.apache.hadoop.io.Text,Mutation>

Throws:

IOException

getRecordWriter

public org.apache.hadoop.mapred.RecordWriter<org.apache.hadoop.io.Text,Mutation> getRecordWriter(org.apache.hadoop.fs.FileSystem ignored,
                                                                                        org.apache.hadoop.mapred.JobConf job,
                                                                                        String name,
                                                                                        org.apache.hadoop.util.Progressable progress)
                                                                                          throws IOException

Specified by:

getRecordWriter in interface org.apache.hadoop.mapred.OutputFormat<org.apache.hadoop.io.Text,Mutation>

Throws:

IOException