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https://issues.apache.org/jira/browse/HDFS-8771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14628999#comment-14628999
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Takuya Fukudome commented on HDFS-8771:
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[~kanaka], thank you for the clarification. It sounds good to me.
> 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
> Assignee: kanaka kumar avvaru
>
> 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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