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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1042) Namesystem metrics are collected before namesystem is fully initialized
Date Wed, 17 Mar 2010 22:57:27 GMT

    [ 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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