Erik Krogen created HDFS-12323:
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Summary: NameNode terminates after full GC thinking QJM
unresponsive if full GC is longer than timeout
Key: HDFS-12323
URL: https://issues.apache.org/jira/browse/HDFS-12323
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode, qjm
Affects Versions: 2.7.4
Reporter: Erik Krogen
Assignee: Erik Krogen
HDFS-10733 attempted to fix the issue where the Namenode process would
terminate itself if it had a GC pause which lasted longer than the QJM timeout,
since it would think that the QJM had taken too long to respond. However, it
only bumps up the timeout expiration by one timeout length, so if the GC pause
was e.g. 2x the length of the timeout, a TimeoutException will be thrown and
the NN will still terminate itself.
Thanks to [~yangjiandan] for noting this issue as a comment on HDFS-10733; we
have also seen this issue on a real cluster even after HDFS-10733 is applied.
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