changes to OutputFormat to work on temporary directory to enable re-running
crashed jobs (Issue: 1121)
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Key: HADOOP-1558
URL: https://issues.apache.org/jira/browse/HADOOP-1558
Project: Hadoop
Issue Type: Improvement
Components: mapred
Environment: all
Reporter: Alejandro Abdelnur
Fix For: 0.14.0
Add OutputFormat methods like:
/** Called to initialize output for this job. */
void initialize(JobConf job) throws IOException;
/** Called to finalize output for this job. */
void commit(JobConf job) throws IOException;
In the base implemenation for FileSystem output, initialize() might then create
a temporary directory for the job, removing any that already exists, and commit
could rename the temporary output directory to the final name.
The existing checkOutputSpecs() would continue to throw an exception if the
final output already exists.
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