org.apache.hadoop.mapreduce
Class Reducer.Context

java.lang.Object
  org.apache.hadoop.mapreduce.JobContext
      org.apache.hadoop.mapreduce.TaskAttemptContext
          org.apache.hadoop.mapreduce.TaskInputOutputContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT>
              org.apache.hadoop.mapreduce.ReduceContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT>
                  org.apache.hadoop.mapreduce.Reducer.Context

All Implemented Interfaces:

Progressable

Enclosing class:

Reducer<KEYIN,VALUEIN,KEYOUT,VALUEOUT>

public class Reducer.Context
extends ReduceContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT>

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.ReduceContext

ReduceContext.ValueIterable, ReduceContext.ValueIterator

Field Summary

Fields inherited from class org.apache.hadoop.mapreduce.ReduceContext

reporter

Fields inherited from class org.apache.hadoop.mapreduce.JobContext

CACHE_ARCHIVES_VISIBILITIES, CACHE_FILE_VISIBILITIES, COMBINE_CLASS_ATTR, conf, credentials, INPUT_FORMAT_CLASS_ATTR, JOB_ACL_MODIFY_JOB, JOB_ACL_VIEW_JOB, JOB_CANCEL_DELEGATION_TOKEN, JOB_NAMENODES, MAP_CLASS_ATTR, OUTPUT_FORMAT_CLASS_ATTR, PARTITIONER_CLASS_ATTR, REDUCE_CLASS_ATTR, ugi, USER_LOG_RETAIN_HOURS

Constructor Summary

Reducer.Context(Configuration conf, TaskAttemptID taskid, RawKeyValueIterator input, Counter inputKeyCounter, Counter inputValueCounter, RecordWriter<KEYOUT,VALUEOUT> output, OutputCommitter committer, StatusReporter reporter, RawComparator<KEYIN> comparator, Class<KEYIN> keyClass, Class<VALUEIN> valueClass)

Method Summary

Methods inherited from class org.apache.hadoop.mapreduce.ReduceContext

getCurrentKey, getCurrentValue, getValues, nextKey, nextKeyValue

Methods inherited from class org.apache.hadoop.mapreduce.TaskInputOutputContext

getCounter, getCounter, getOutputCommitter, getProgress, progress, setStatus, write

Methods inherited from class org.apache.hadoop.mapreduce.TaskAttemptContext

getStatus, getTaskAttemptID

Methods inherited from class org.apache.hadoop.mapreduce.JobContext

getCombinerClass, getConfiguration, getCredentials, getGroupingComparator, getInputFormatClass, getJar, getJobID, getJobName, getMapOutputKeyClass, getMapOutputValueClass, getMapperClass, getNumReduceTasks, getOutputFormatClass, getOutputKeyClass, getOutputValueClass, getPartitionerClass, getReducerClass, getSortComparator, getWorkingDirectory

Methods inherited from class java.lang.Object

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

Constructor Detail

Reducer.Context

public Reducer.Context(Configuration conf,
                       TaskAttemptID taskid,
                       RawKeyValueIterator input,
                       Counter inputKeyCounter,
                       Counter inputValueCounter,
                       RecordWriter<KEYOUT,VALUEOUT> output,
                       OutputCommitter committer,
                       StatusReporter reporter,
                       RawComparator<KEYIN> comparator,
                       Class<KEYIN> keyClass,
                       Class<VALUEIN> valueClass)
                throws IOException,
                       InterruptedException

Throws:

IOException

InterruptedException