Mohammad Kamrul Islam created MAPREDUCE-5694:
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Summary: MR AM container syslog is empty
Key: MAPREDUCE-5694
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5694
Project: Hadoop Map/Reduce
Issue Type: Bug
Affects Versions: 2.2.0
Reporter: Mohammad Kamrul Islam
Assignee: Mohammad Kamrul Islam
When the property "mapreduce.task.userlog.limit.kb" is set non-zero in
mapped-site.xml, AM container syslog remains empty. Without the log, it is hard
to identify the cause of any MR AM failure.
However, if "mapreduce.task.userlog.limit.kb" is not set (or defaulted to 0),
syslog contents are correct.
Bug details:
For non zero "mapreduce.task.userlog.limit.kb", the code caches the log
contents into memory, waited to be written to file when close() method is
called at the end(Ref: ContainerLogAppender.java).
Explicit call of LogManager.shutdown() from the main() (REF:MRAppMaster.java),
ultimately call the *Appender.close().
Root Cause:
LogManager.shutdown() is not being called from MRAppMaster.java.
Similar steps were taken correctly in YarnChild.java.
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