org.apache.accumulo.core.client.mapreduce

Class AccumuloOutputFormat

java.lang.Object

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

org.apache.accumulo.core.client.mapreduce.AccumuloOutputFormat

public class AccumuloOutputFormat
extends org.apache.hadoop.mapreduce.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(Job, String, AuthenticationToken)
• setConnectorInfo(Job, String, String)
• setZooKeeperInstance(Job, ClientConfiguration) OR setMockInstance(Job, 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

Modifier and Type	Method and Description
protected static Boolean	canCreateTables(org.apache.hadoop.mapreduce.JobContext context) Determines whether tables are permitted to be created as needed.
void	checkOutputSpecs(org.apache.hadoop.mapreduce.JobContext job)
protected static AuthenticationToken	getAuthenticationToken(org.apache.hadoop.mapreduce.JobContext context) Gets the authenticated token from either the specified token file or directly from the configuration, whichever was used when the job was configured.
protected static BatchWriterConfig	getBatchWriterOptions(org.apache.hadoop.mapreduce.JobContext context) Gets the BatchWriterConfig settings.
protected static String	getDefaultTableName(org.apache.hadoop.mapreduce.JobContext context) Gets the default table name from the configuration.
protected static Instance	getInstance(org.apache.hadoop.mapreduce.JobContext context) Initializes an Accumulo Instance based on the configuration.
protected static org.apache.log4j.Level	getLogLevel(org.apache.hadoop.mapreduce.JobContext context) Gets the log level from this configuration.
org.apache.hadoop.mapreduce.OutputCommitter	getOutputCommitter(org.apache.hadoop.mapreduce.TaskAttemptContext context)
protected static String	getPrincipal(org.apache.hadoop.mapreduce.JobContext context) Gets the user name from the configuration.
org.apache.hadoop.mapreduce.RecordWriter<org.apache.hadoop.io.Text,Mutation>	getRecordWriter(org.apache.hadoop.mapreduce.TaskAttemptContext attempt)
protected static Boolean	getSimulationMode(org.apache.hadoop.mapreduce.JobContext context) Determines whether this feature is enabled.
protected static byte[]	getToken(org.apache.hadoop.mapreduce.JobContext context) Deprecated. since 1.6.0; Use getAuthenticationToken(JobContext) instead.
protected static String	getTokenClass(org.apache.hadoop.mapreduce.JobContext context) Deprecated. since 1.6.0; Use getAuthenticationToken(JobContext) instead.
protected static Boolean	isConnectorInfoSet(org.apache.hadoop.mapreduce.JobContext context) Determines if the connector has been configured.
static void	setBatchWriterOptions(org.apache.hadoop.mapreduce.Job job, BatchWriterConfig bwConfig) Sets the configuration for for the job's BatchWriter instances.
static void	setConnectorInfo(org.apache.hadoop.mapreduce.Job job, String principal, AuthenticationToken token) Sets the connector information needed to communicate with Accumulo in this job.
static void	setConnectorInfo(org.apache.hadoop.mapreduce.Job job, String principal, String tokenFile) Sets the connector information needed to communicate with Accumulo in this job.
static void	setCreateTables(org.apache.hadoop.mapreduce.Job job, boolean enableFeature) Sets the directive to create new tables, as necessary.
static void	setDefaultTableName(org.apache.hadoop.mapreduce.Job 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.mapreduce.Job job, org.apache.log4j.Level level) Sets the log level for this job.
static void	setMockInstance(org.apache.hadoop.mapreduce.Job job, String instanceName) Configures a MockInstance for this job.
static void	setSimulationMode(org.apache.hadoop.mapreduce.Job job, boolean enableFeature) Sets the directive to use simulation mode for this job.
static void	setZooKeeperInstance(org.apache.hadoop.mapreduce.Job job, ClientConfiguration clientConfig) Configures a ZooKeeperInstance for this job.
static void	setZooKeeperInstance(org.apache.hadoop.mapreduce.Job job, String instanceName, String zooKeepers) Deprecated. since 1.6.0; Use setZooKeeperInstance(Job, ClientConfiguration) instead.

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.mapreduce.Job 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 if setCreateTables(Job, boolean) is set to true)

token - the user's password

Throws:

AccumuloSecurityException

Since:

1.5.0

setConnectorInfo

public static void setConnectorInfo(org.apache.hadoop.mapreduce.Job 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 if setCreateTables(Job, boolean) is set to true)

tokenFile - the path to the token file

Throws:

AccumuloSecurityException

Since:

1.6.0

isConnectorInfoSet

protected static Boolean isConnectorInfoSet(org.apache.hadoop.mapreduce.JobContext context)

Determines if the connector has been configured.

Parameters:

context - the Hadoop context for the configured job

Returns:

true if the connector has been configured, false otherwise

Since:

1.5.0

See Also:

setConnectorInfo(Job, String, AuthenticationToken)

getPrincipal

protected static String getPrincipal(org.apache.hadoop.mapreduce.JobContext context)

Gets the user name from the configuration.

Parameters:

context - the Hadoop context for the configured job

Returns:

the user name

Since:

1.5.0

See Also:

setConnectorInfo(Job, String, AuthenticationToken)

getTokenClass

@Deprecated
protected static String getTokenClass(org.apache.hadoop.mapreduce.JobContext context)

Deprecated. since 1.6.0; Use getAuthenticationToken(JobContext) instead.

Gets the serialized token class from either the configuration or the token file.

Since:

1.5.0

getToken

@Deprecated
protected static byte[] getToken(org.apache.hadoop.mapreduce.JobContext context)

Deprecated. since 1.6.0; Use getAuthenticationToken(JobContext) instead.

Gets the serialized token from either the configuration or the token file.

Since:

1.5.0

getAuthenticationToken

protected static AuthenticationToken getAuthenticationToken(org.apache.hadoop.mapreduce.JobContext context)

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

Parameters:

context - the Hadoop context for the configured job

Returns:

the principal's authentication token

Since:

1.6.0

See Also:

setConnectorInfo(Job, String, AuthenticationToken), setConnectorInfo(Job, String, String)

setZooKeeperInstance

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

Deprecated. since 1.6.0; Use setZooKeeperInstance(Job, 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.mapreduce.Job job,
                                        ClientConfiguration clientConfig)

Configures a ZooKeeperInstance for this job.

Parameters:

job - the Hadoop job instance to be configured

clientConfig - client configuration for specifying connection timeouts, SSL connection options, etc.

Since:

1.6.0

setMockInstance

public static void setMockInstance(org.apache.hadoop.mapreduce.Job 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.mapreduce.JobContext context)

Initializes an Accumulo Instance based on the configuration.

Parameters:

context - the Hadoop context for the configured job

Returns:

an Accumulo instance

Since:

1.5.0

See Also:

setZooKeeperInstance(Job, ClientConfiguration), setMockInstance(Job, String)

setLogLevel

public static void setLogLevel(org.apache.hadoop.mapreduce.Job 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.mapreduce.JobContext context)

Gets the log level from this configuration.

Parameters:

context - the Hadoop context for the configured job

Returns:

the log level

Since:

1.5.0

See Also:

setLogLevel(Job, Level)

setDefaultTableName

public static void setDefaultTableName(org.apache.hadoop.mapreduce.Job 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.mapreduce.JobContext context)

Gets the default table name from the configuration.

Parameters:

context - the Hadoop context for the configured job

Returns:

the default table name

Since:

1.5.0

See Also:

setDefaultTableName(Job, String)

setBatchWriterOptions

public static void setBatchWriterOptions(org.apache.hadoop.mapreduce.Job 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.mapreduce.JobContext context)

Gets the BatchWriterConfig settings.

Parameters:

context - the Hadoop context for the configured job

Returns:

the configuration object

Since:

1.5.0

See Also:

setBatchWriterOptions(Job, BatchWriterConfig)

setCreateTables

public static void setCreateTables(org.apache.hadoop.mapreduce.Job 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.mapreduce.JobContext context)

Determines whether tables are permitted to be created as needed.

Parameters:

context - the Hadoop context for the configured job

Returns:

true if the feature is disabled, false otherwise

Since:

1.5.0

See Also:

setCreateTables(Job, boolean)

setSimulationMode

public static void setSimulationMode(org.apache.hadoop.mapreduce.Job 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.mapreduce.JobContext context)

Determines whether this feature is enabled.

Parameters:

context - the Hadoop context for the configured job

Returns:

true if the feature is enabled, false otherwise

Since:

1.5.0

See Also:

setSimulationMode(Job, boolean)

checkOutputSpecs

public void checkOutputSpecs(org.apache.hadoop.mapreduce.JobContext job)
                      throws IOException

Specified by:

checkOutputSpecs in class org.apache.hadoop.mapreduce.OutputFormat<org.apache.hadoop.io.Text,Mutation>

Throws:

IOException

getOutputCommitter

public org.apache.hadoop.mapreduce.OutputCommitter getOutputCommitter(org.apache.hadoop.mapreduce.TaskAttemptContext context)

Specified by:

getOutputCommitter in class org.apache.hadoop.mapreduce.OutputFormat<org.apache.hadoop.io.Text,Mutation>

getRecordWriter

public org.apache.hadoop.mapreduce.RecordWriter<org.apache.hadoop.io.Text,Mutation> getRecordWriter(org.apache.hadoop.mapreduce.TaskAttemptContext attempt)
                                                                                             throws IOException

Specified by:

getRecordWriter in class org.apache.hadoop.mapreduce.OutputFormat<org.apache.hadoop.io.Text,Mutation>

Throws:

IOException