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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1042) Namesystem metrics are collected before namesystem is fully initialized
Date Fri, 02 Jul 2010 04:50:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12884543#action_12884543
] 

Brahma Reddy Battula commented on HDFS-1042:
--------------------------------------------

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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