org.apache.hadoop.hbase.mapreduce

Class HFileOutputFormat2

java.lang.Object

org.apache.hadoop.mapreduce.OutputFormat<K,V>

org.apache.hadoop.mapreduce.lib.output.FileOutputFormat<ImmutableBytesWritable,Cell>

org.apache.hadoop.hbase.mapreduce.HFileOutputFormat2

@InterfaceAudience.Public
@InterfaceStability.Evolving
public class HFileOutputFormat2
extends org.apache.hadoop.mapreduce.lib.output.FileOutputFormat<ImmutableBytesWritable,Cell>

Writes HFiles. Passed Cells must arrive in order. Writes current time as the sequence id for the file. Sets the major compacted attribute on created hfiles. Calling write(null,null) will forcibly roll all HFiles being written.

Using this class as part of a MapReduce job is best done using configureIncrementalLoad(Job, HTable).

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.lib.output.FileOutputFormat

org.apache.hadoop.mapreduce.lib.output.FileOutputFormat.Counter

Field Summary

Fields

Modifier and Type	Field and Description
static String	DATABLOCK_ENCODING_OVERRIDE_CONF_KEY

Fields inherited from class org.apache.hadoop.mapreduce.lib.output.FileOutputFormat

BASE_OUTPUT_NAME, PART

Constructor Summary

Constructors

Constructor and Description
HFileOutputFormat2()

Method Summary

Methods

Modifier and Type	Method and Description
static void	configureIncrementalLoad(org.apache.hadoop.mapreduce.Job job, HTable table) Configure a MapReduce Job to perform an incremental load into the given table.
org.apache.hadoop.mapreduce.RecordWriter<ImmutableBytesWritable,Cell>	getRecordWriter(org.apache.hadoop.mapreduce.TaskAttemptContext context)

Methods inherited from class org.apache.hadoop.mapreduce.lib.output.FileOutputFormat

checkOutputSpecs, getCompressOutput, getDefaultWorkFile, getOutputCommitter, getOutputCompressorClass, getOutputName, getOutputPath, getPathForWorkFile, getUniqueFile, getWorkOutputPath, setCompressOutput, setOutputCompressorClass, setOutputName, setOutputPath

Methods inherited from class java.lang.Object

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

Field Detail

DATABLOCK_ENCODING_OVERRIDE_CONF_KEY

public static final String DATABLOCK_ENCODING_OVERRIDE_CONF_KEY

See Also:

Constant Field Values

Constructor Detail

HFileOutputFormat2

public HFileOutputFormat2()

Method Detail

getRecordWriter

public org.apache.hadoop.mapreduce.RecordWriter<ImmutableBytesWritable,Cell> getRecordWriter(org.apache.hadoop.mapreduce.TaskAttemptContext context)
                                                                                      throws IOException,
                                                                                             InterruptedException

Specified by:

getRecordWriter in class org.apache.hadoop.mapreduce.lib.output.FileOutputFormat<ImmutableBytesWritable,Cell>

Throws:

IOException

InterruptedException

configureIncrementalLoad

public static void configureIncrementalLoad(org.apache.hadoop.mapreduce.Job job,
                            HTable table)
                                     throws IOException

Configure a MapReduce Job to perform an incremental load into the given table. This

• Inspects the table to configure a total order partitioner
• Uploads the partitions file to the cluster and adds it to the DistributedCache
• Sets the number of reduce tasks to match the current number of regions
• Sets the output key/value class to match HFileOutputFormat2's requirements
• Sets the reducer up to perform the appropriate sorting (either KeyValueSortReducer or PutSortReducer)

The user should be sure to set the map output value class to either KeyValue or Put before running this function.

Throws:

IOException