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[MAPREDUCE-7193] Review of CombineFile Code #610

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[MAPREDUCE-7193] Review of CombineFile Code #610

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43 changes: 21 additions & 22 deletions ...t/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/InputFormat.java
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Original file line number Diff line number Diff line change
Expand Up @@ -69,39 +69,38 @@
@InterfaceStability.Stable
public abstract class InputFormat<K, V> {

/**
* Logically split the set of input files for the job.
*
* <p>Each {@link InputSplit} is then assigned to an individual {@link Mapper}
* for processing.</p>
/**
* Logically split the set of input files for the job.
*
* <p>
* Each {@link InputSplit} is then assigned to an individual {@link Mapper}
* for processing.
* </p>
*
* <p>
* <i>Note</i>: The split is a <i>logical</i> split of the inputs and the
* input files are not physically split into chunks. For e.g. a split could be
* <i>&lt;input-file-path, start, offset&gt;</i> tuple. The InputFormat also
* creates the {@link RecordReader} to read the {@link InputSplit}.
*
* <p><i>Note</i>: The split is a <i>logical</i> split of the inputs and the
* input files are not physically split into chunks. For e.g. a split could
* be <i>&lt;input-file-path, start, offset&gt;</i> tuple. The InputFormat
* also creates the {@link RecordReader} to read the {@link InputSplit}.
*
* @param context job configuration.
* @return an array of {@link InputSplit}s for the job.
*/
public abstract
List<InputSplit> getSplits(JobContext context
) throws IOException, InterruptedException;

public abstract List<InputSplit> getSplits(JobContext context)
throws IOException, InterruptedException;

/**
* Create a record reader for a given split. The framework will call
* {@link RecordReader#initialize(InputSplit, TaskAttemptContext)} before
* the split is used.
* {@link RecordReader#initialize(InputSplit, TaskAttemptContext)} before the
* split is used.
*
* @param split the split to be read
* @param context the information about the task
* @return a new record reader
* @throws IOException
* @throws InterruptedException
*/
public abstract
RecordReader<K,V> createRecordReader(InputSplit split,
TaskAttemptContext context
) throws IOException,
InterruptedException;

public abstract RecordReader<K, V> createRecordReader(InputSplit split,
TaskAttemptContext context) throws IOException, InterruptedException;
}

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