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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
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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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