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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12323) NameNode terminates after full GC thinking QJM unresponsive if full GC is much longer than timeout
Date Fri, 15 Sep 2017 21:23:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16168545#comment-16168545
] 

Andrew Wang commented on HDFS-12323:
------------------------------------

Given that this is going into maintenance releases, any reason not to put this into branch-3.0
for beta1 also?

> NameNode terminates after full GC thinking QJM unresponsive if full GC is much 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
>             Fix For: 2.9.0, 2.8.3, 2.7.5, 3.1.0
>
>         Attachments: HDFS-12323.000.patch, HDFS-12323.001.patch, HDFS-12323.002.patch,
HDFS-12323.003.patch, HDFS-12323.004.patch
>
>
> 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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