org.apache.cassandra.hadoop

Class HadoopCompat

java.lang.Object

org.apache.cassandra.hadoop.HadoopCompat

public class HadoopCompat
extends Object

Utility methods to allow applications to deal with inconsistencies between MapReduce Context Objects API between Hadoop 1.x and 2.x.

Constructor Summary

Constructors

Constructor and Description
HadoopCompat()

Method Summary

Modifier and Type	Method and Description
static org.apache.hadoop.conf.Configuration	getConfiguration(org.apache.hadoop.mapreduce.JobContext context) Invoke getConfiguration() on JobContext.
static org.apache.hadoop.mapreduce.MapContext	newMapContext(org.apache.hadoop.conf.Configuration conf, org.apache.hadoop.mapreduce.TaskAttemptID taskAttemptID, org.apache.hadoop.mapreduce.RecordReader recordReader, org.apache.hadoop.mapreduce.RecordWriter recordWriter, org.apache.hadoop.mapreduce.OutputCommitter outputCommitter, org.apache.hadoop.mapreduce.StatusReporter statusReporter, org.apache.hadoop.mapreduce.InputSplit inputSplit) Instantiates MapContext under Hadoop 1 and MapContextImpl under Hadoop 2.
static org.apache.hadoop.mapreduce.TaskAttemptContext	newTaskAttemptContext(org.apache.hadoop.conf.Configuration conf, org.apache.hadoop.mapreduce.TaskAttemptID taskAttemptId) Creates TaskAttempContext from a JobConf and jobId using the correct constructor for based on Hadoop version.

Methods inherited from class java.lang.Object

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

Constructor Detail

HadoopCompat

public HadoopCompat()

Method Detail

newTaskAttemptContext

public static org.apache.hadoop.mapreduce.TaskAttemptContext newTaskAttemptContext(org.apache.hadoop.conf.Configuration conf,
                                                                                   org.apache.hadoop.mapreduce.TaskAttemptID taskAttemptId)

Creates TaskAttempContext from a JobConf and jobId using the correct constructor for based on Hadoop version.

newMapContext

public static org.apache.hadoop.mapreduce.MapContext newMapContext(org.apache.hadoop.conf.Configuration conf,
                                                                   org.apache.hadoop.mapreduce.TaskAttemptID taskAttemptID,
                                                                   org.apache.hadoop.mapreduce.RecordReader recordReader,
                                                                   org.apache.hadoop.mapreduce.RecordWriter recordWriter,
                                                                   org.apache.hadoop.mapreduce.OutputCommitter outputCommitter,
                                                                   org.apache.hadoop.mapreduce.StatusReporter statusReporter,
                                                                   org.apache.hadoop.mapreduce.InputSplit inputSplit)

Instantiates MapContext under Hadoop 1 and MapContextImpl under Hadoop 2.

getConfiguration

public static org.apache.hadoop.conf.Configuration getConfiguration(org.apache.hadoop.mapreduce.JobContext context)

Invoke getConfiguration() on JobContext. Works with both Hadoop 1 and 2.