Provide programmatic access to use job log
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Key: HADOOP-7592
URL: https://issues.apache.org/jira/browse/HADOOP-7592
Project: Hadoop Common
Issue Type: Improvement
Reporter: Mohammad Kamrul Islam
Since hadoop job/task log is critical for debugging, providing a programmatic
access would definitely add a big value to the end user.
Oozie users are repeatedly asking to open up the hadoop job log for them.
However, Oozie doesn't have any knowledge about the log location as well as the
log contents of hadoop job.
The expected programmatic access could come in any or both ways:
1. Allowing an API such as getLogPath(jobId) that returns the base HDFS path of
the job directory.
2. Allowing an API such as getLog(jobId) that will return the log contents (may
be as streaming output).
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