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https://issues.apache.org/jira/browse/HDFS-9655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15109655#comment-15109655
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John Zhuge commented on HDFS-9655:
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Thanks [~eddyxu].
> NN should start JVM pause monitor before loading fsimage
> --------------------------------------------------------
>
> Key: HDFS-9655
> URL: https://issues.apache.org/jira/browse/HDFS-9655
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: John Zhuge
> Assignee: John Zhuge
> Priority: Critical
> Fix For: 2.8.0
>
> Attachments: HDFS-9655.001.patch
>
>
> We have seen many cases of NameNode startup either extremely slow or even
> hung. Most of them were caused by insufficient heap size with regard to the
> metadata size. Those cases were resolved by increasing the heap size.
> However it did take support team some time to root cause. JVM pause warning
> messages would greatly assist in such diagnosis, but NN starts JVM pause
> monitor after fsimage/edits loading.
> Propose to start JVM pause monitor before loading fsimage/edits.
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