org.apache.hadoop.mapreduce

类 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

所有已实现的接口:

Progressable

封闭类:

Reducer<KEYIN,VALUEIN,KEYOUT,VALUEOUT>

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

嵌套类概要

从类继承的嵌套类/接口 org.apache.hadoop.mapreduce.ReduceContext

ReduceContext.ValueIterable, ReduceContext.ValueIterator

字段概要

从类继承的字段 org.apache.hadoop.mapreduce.ReduceContext

reporter

从类继承的字段 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

构造器概要

构造器

构造器和说明
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)

方法概要

从类继承的方法 org.apache.hadoop.mapreduce.ReduceContext

getCurrentKey, getCurrentValue, getValues, nextKey, nextKeyValue

从类继承的方法 org.apache.hadoop.mapreduce.TaskInputOutputContext

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

从类继承的方法 org.apache.hadoop.mapreduce.TaskAttemptContext

getStatus, getTaskAttemptID

从类继承的方法 org.apache.hadoop.mapreduce.JobContext

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

从类继承的方法 java.lang.Object

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

构造器详细资料

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

抛出:

IOException

InterruptedException