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java.lang.Object org.apache.hadoop.mapreduce.OutputCommitter org.apache.hadoop.mapred.OutputCommitter org.apache.hadoop.mapred.FileOutputCommitter
@InterfaceAudience.Public @InterfaceStability.Stable public class FileOutputCommitter
An OutputCommitter
that commits files specified
in job output directory i.e. ${mapreduce.output.fileoutputformat.outputdir}.
Field Summary | |
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static org.apache.commons.logging.Log |
LOG
|
static String |
SUCCEEDED_FILE_NAME
|
static String |
TEMP_DIR_NAME
Temporary directory name |
Constructor Summary | |
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FileOutputCommitter()
|
Method Summary | |
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void |
abortJob(JobContext context,
int runState)
For aborting an unsuccessful job's output. |
void |
abortTask(TaskAttemptContext context)
Discard the task output. |
void |
cleanupJob(JobContext context)
Deprecated. |
void |
commitJob(JobContext context)
For committing job's output after successful job completion. |
void |
commitTask(TaskAttemptContext context)
To promote the task's temporary output to final output location. |
Path |
getWorkPath(TaskAttemptContext context,
Path outputPath)
|
boolean |
isRecoverySupported()
This method implements the new interface by calling the old method. |
boolean |
needsTaskCommit(TaskAttemptContext context)
Check whether task needs a commit. |
void |
recoverTask(TaskAttemptContext context)
Recover the task output. |
void |
setupJob(JobContext context)
For the framework to setup the job output during initialization. |
void |
setupTask(TaskAttemptContext context)
Sets up output for the task. |
Methods inherited from class org.apache.hadoop.mapred.OutputCommitter |
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abortJob, abortTask, cleanupJob, commitJob, commitTask, needsTaskCommit, recoverTask, setupJob, setupTask |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final org.apache.commons.logging.Log LOG
public static final String TEMP_DIR_NAME
public static final String SUCCEEDED_FILE_NAME
Constructor Detail |
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public FileOutputCommitter()
Method Detail |
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public Path getWorkPath(TaskAttemptContext context, Path outputPath) throws IOException
IOException
public void setupJob(JobContext context) throws IOException
OutputCommitter
setupJob
in class OutputCommitter
context
- Context of the job whose output is being written.
IOException
- if temporary output could not be createdpublic void commitJob(JobContext context) throws IOException
OutputCommitter
commitJob
in class OutputCommitter
context
- Context of the job whose output is being written.
IOException
@Deprecated public void cleanupJob(JobContext context) throws IOException
OutputCommitter
cleanupJob
in class OutputCommitter
context
- Context of the job whose output is being written.
IOException
public void abortJob(JobContext context, int runState) throws IOException
OutputCommitter
JobStatus.FAILED
or
JobStatus.KILLED
. This is called from the application
master process for the entire job. This may be called multiple times.
abortJob
in class OutputCommitter
context
- Context of the job whose output is being written.runState
- final runstate of the job
IOException
public void setupTask(TaskAttemptContext context) throws IOException
OutputCommitter
setupTask
in class OutputCommitter
context
- Context of the task whose output is being written.
IOException
public void commitTask(TaskAttemptContext context) throws IOException
OutputCommitter
OutputCommitter.needsTaskCommit(TaskAttemptContext)
returns true and this
task is the task that the AM determines finished first, this method
is called to commit an individual task's output. This is to mark
that tasks output as complete, as OutputCommitter.commitJob(JobContext)
will
also be called later on if the entire job finished successfully. This
is called from a task's process. This may be called multiple times for the
same task, but different task attempts. It should be very rare for this to
be called multiple times and requires odd networking failures to make this
happen. In the future the Hadoop framework may eliminate this race.
commitTask
in class OutputCommitter
context
- Context of the task whose output is being written.
IOException
- if commit is notpublic void abortTask(TaskAttemptContext context) throws IOException
OutputCommitter
abortTask
in class OutputCommitter
IOException
public boolean needsTaskCommit(TaskAttemptContext context) throws IOException
OutputCommitter
needsTaskCommit
in class OutputCommitter
IOException
public boolean isRecoverySupported()
OutputCommitter
isRecoverySupported
in class OutputCommitter
true
if task output recovery is supported,
false
otherwiseOutputCommitter.recoverTask(TaskAttemptContext)
public void recoverTask(TaskAttemptContext context) throws IOException
OutputCommitter
MRConstants.APPLICATION_ATTEMPT_ID
key in
JobContext.getConfiguration()
for the
OutputCommitter
. This is called from the application master
process, but it is called individually for each task.
If an exception is thrown the task will be attempted again.
recoverTask
in class OutputCommitter
context
- Context of the task whose output is being recovered
IOException
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