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From "Erik Krogen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-12323) NameNode terminates after full GC thinking QJM unresponsive if full GC is longer than timeout
Date Fri, 18 Aug 2017 20:36:00 GMT
Erik Krogen created HDFS-12323:
----------------------------------

             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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