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Date: Wed, 17 Mar 2010 22:57:27 +0000 (UTC)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-1042) Namesystem metrics are collected
 before namesystem is fully initialized
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    [ https://issues.apache.org/jira/browse/HDFS-1042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12846648#action_12846648 ] 

Todd Lipcon commented on HDFS-1042:
-----------------------------------

Sample stack trace from a CDH 0.20.2:
{noformat}
java.lang.NullPointerException
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getFilesTotal(FSNamesystem.java:4621)
        at org.apache.hadoop.hdfs.server.namenode.metrics.FSNamesystemMetrics.doUpdates(FSNamesystemMetrics.java:100)
        at org.apache.hadoop.metrics.spi.AbstractMetricsContext.timerEvent(AbstractMetricsContext.java:293)
        at org.apache.hadoop.metrics.spi.AbstractMetricsContext.access$000(AbstractMetricsContext.java:53)
        at org.apache.hadoop.metrics.spi.AbstractMetricsContext$1.run(AbstractMetricsContext.java:258)
        at java.util.TimerThread.mainLoop(Timer.java:512)
        at java.util.TimerThread.run(Timer.java:462)
{noformat}

> 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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