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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9655) NN should start JVM pause monitor before loading fsimage
Date Tue, 26 Jan 2016 06:00:44 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Yongjun Zhang updated HDFS-9655:
    Labels: supportability  (was: )

> 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
>              Labels: supportability
>             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
> Propose to start JVM pause monitor before loading fsimage/edits.

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