| 程序包 | 说明 |
|---|---|
| org.apache.hadoop.mapred |
A software framework for easily writing applications which process vast
amounts of data (multi-terabyte data-sets) parallelly on large clusters
(thousands of nodes) built of commodity hardware in a reliable, fault-tolerant
manner.
|
| org.apache.hadoop.mapreduce |
| 限定符和类型 | 方法和说明 |
|---|---|
protected void |
Task.OldCombinerRunner.combine(RawKeyValueIterator kvIter,
OutputCollector<K,V> combineCollector) |
protected static <INKEY,INVALUE,OUTKEY,OUTVALUE> |
Task.createReduceContext(Reducer<INKEY,INVALUE,OUTKEY,OUTVALUE> reducer,
Configuration job,
TaskAttemptID taskId,
RawKeyValueIterator rIter,
Counter inputKeyCounter,
Counter inputValueCounter,
RecordWriter<OUTKEY,OUTVALUE> output,
OutputCommitter committer,
StatusReporter reporter,
RawComparator<INKEY> comparator,
Class<INKEY> keyClass,
Class<INVALUE> valueClass) |
| 构造器和说明 |
|---|
Task.CombineValuesIterator(RawKeyValueIterator in,
RawComparator<KEY> comparator,
Class<KEY> keyClass,
Class<VALUE> valClass,
Configuration conf,
Reporter reporter,
Counters.Counter combineInputCounter) |
| 构造器和说明 |
|---|
ReduceContext(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) |
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) |
Copyright © 2009 The Apache Software Foundation