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From "Takuya Fukudome (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8771) If IPCLoggerChannel#purgeLogsOlderThan takes too long, Namenode could not send another RPC calls to Journalnodes
Date Tue, 14 Jul 2015 08:20:04 GMT
Takuya Fukudome created HDFS-8771:
-------------------------------------

             Summary: If IPCLoggerChannel#purgeLogsOlderThan takes too long, Namenode could
not send another RPC calls to Journalnodes
                 Key: HDFS-8771
                 URL: https://issues.apache.org/jira/browse/HDFS-8771
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Takuya Fukudome


In our cluster, edits has became huge(about 50GB) accidentally and our Jounalnodes' disks
were busy, therefore {{purgeLogsOlderThan}} took more than 30secs. If {{IPCLoggerChannel#purgeLogsOlderThan}}
takes too much time, Namenode couldn't send other RPC calls to Journalnodes because {{o.a.h.hdfs.qjournal.client.IPCLoggerChannel}}'s
executor is single thread. It will cause namenode shutting down.
I think IPCLoggerChannel#purgeLogsOlderThan should not block other RPC calls like sendEdits.



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