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https://issues.apache.org/jira/browse/HDFS-10713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15449776#comment-15449776
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Arpit Agarwal commented on HDFS-10713:
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Thanks for the patch [~hanishakoneru].
# We can do the timestamp checks just before the
{{this.fsLock.writeLock().unlock()}} call, so the new state is protected by the
write lock. The actual logging can be done outside the write lock though. Then
you don't need to make the members volatile anymore.
# We can cache the value returned by {{monotonicNow()}} instead of calling it
twice.
> Throttle FsNameSystem lock warnings
> -----------------------------------
>
> Key: HDFS-10713
> URL: https://issues.apache.org/jira/browse/HDFS-10713
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: logging, namenode
> Reporter: Arpit Agarwal
> Assignee: Hanisha Koneru
> Attachments: HDFS-10713.000.patch
>
>
> The NameNode logs a message if the FSNamesystem write lock is held by a
> thread for over 1 second. These messages can be throttled to at one most one
> per x minutes to avoid potentially filling up NN logs. We can also log the
> number of suppressed notices since the last log message.
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