org.apache.hadoop.hbase.mapreduce

Class MultiTableOutputFormat.MultiTableRecordWriter

java.lang.Object

org.apache.hadoop.mapreduce.RecordWriter<org.apache.hadoop.hbase.io.ImmutableBytesWritable,org.apache.hadoop.hbase.client.Mutation>

org.apache.hadoop.hbase.mapreduce.MultiTableOutputFormat.MultiTableRecordWriter

Enclosing class:

MultiTableOutputFormat

protected static class MultiTableOutputFormat.MultiTableRecordWriter
extends org.apache.hadoop.mapreduce.RecordWriter<org.apache.hadoop.hbase.io.ImmutableBytesWritable,org.apache.hadoop.hbase.client.Mutation>

Record writer for outputting to multiple HTables.

Constructor Summary

Constructors

Constructor and Description
MultiTableRecordWriter(org.apache.hadoop.conf.Configuration conf, boolean useWriteAheadLogging)

Method Summary

Modifier and Type	Method and Description
void	close(org.apache.hadoop.mapreduce.TaskAttemptContext context)
void	write(org.apache.hadoop.hbase.io.ImmutableBytesWritable tableName, org.apache.hadoop.hbase.client.Mutation action) Writes an action (Put or Delete) to the specified table.

Methods inherited from class java.lang.Object

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

Constructor Detail

MultiTableRecordWriter

public MultiTableRecordWriter(org.apache.hadoop.conf.Configuration conf,
                              boolean useWriteAheadLogging)
                       throws IOException

Parameters:

conf - HBaseConfiguration to used

useWriteAheadLogging - whether to use write ahead logging. This can be turned off ( false) to improve performance when bulk loading data.

Throws:

IOException

Method Detail

close

public void close(org.apache.hadoop.mapreduce.TaskAttemptContext context)
           throws IOException

Specified by:

close in class org.apache.hadoop.mapreduce.RecordWriter<org.apache.hadoop.hbase.io.ImmutableBytesWritable,org.apache.hadoop.hbase.client.Mutation>

Throws:

IOException

write

public void write(org.apache.hadoop.hbase.io.ImmutableBytesWritable tableName,
                  org.apache.hadoop.hbase.client.Mutation action)
           throws IOException

Writes an action (Put or Delete) to the specified table.

Specified by:

write in class org.apache.hadoop.mapreduce.RecordWriter<org.apache.hadoop.hbase.io.ImmutableBytesWritable,org.apache.hadoop.hbase.client.Mutation>

Parameters:

tableName - the table being updated.

action - the update, either a put or a delete.

Throws:

IllegalArgumentException - if the action is not a put or a delete.

IOException