streaming should optionally treat a non-zero exit status of a child process as
a failed task
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Key: HADOOP-2057
URL: https://issues.apache.org/jira/browse/HADOOP-2057
Project: Hadoop
Issue Type: Improvement
Components: contrib/streaming
Affects Versions: 0.14.2
Reporter: Rick Cox
The exit status of the external processes spawned by streaming tasks is
currently logged, but not used to indicate success or failure of the task.
While this is reasonable for some UNIX tools (e.g. grep), many programs will
indicate failure by a non-zero exit status. (Also, even for custom programs,
intentionally indicating the failure of a streaming task is currently rather
tricky.)
This could be supported by adding a new job-configuration setting,
'stream.non.zero.exit.is.failure'. If true, a non-zero exit status of a child
process would throw an exception in the PipeMapRed, causing task failure. The
current behavior would be preserved by using a default setting of false.
This would allow streaming tasks to easily indicate failure, even if all input
has already been consumed.
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