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https://issues.apache.org/jira/browse/HDFS-1042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12884543#action_12884543
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Brahma Reddy Battula commented on HDFS-1042:
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Hi Todd Lipcon ,
can you give exact scenario to replicate this...
> Namesystem metrics are collected before namesystem is fully initialized
> -----------------------------------------------------------------------
>
> Key: HDFS-1042
> URL: https://issues.apache.org/jira/browse/HDFS-1042
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.20.2, 0.21.0, 0.22.0
> Reporter: Todd Lipcon
>
> FSNamesystem leaks its reference out to the metrics system before it has
> initialized FSDirectory. Therefore in rare occasions you can get NPEs when
> metrics try to collect data from FSN before it's initialized.
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