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https://issues.apache.org/jira/browse/HADOOP-8443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13284609#comment-13284609
]
Harsh J commented on HADOOP-8443:
---------------------------------
Appears to be a hanging metrics thread:
{code}
java.lang.NullPointerException
at
org.apache.hadoop.hdfs.server.namenode.BlocksMap.size(BlocksMap.java:457)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getBlocksTotal(FSNamesystem.java:5046)
at
org.apache.hadoop.hdfs.server.namenode.metrics.FSNamesystemMetrics.doUpdates(FSNamesystemMetrics.java:101)
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)
{code}
> MiniDFSCluster Hangs
> --------------------
>
> Key: HADOOP-8443
> URL: https://issues.apache.org/jira/browse/HADOOP-8443
> Project: Hadoop Common
> Issue Type: Bug
> Components: test
> Affects Versions: 1.0.2
> Environment: Mac OSX 10.7.3
> Reporter: Ivan Provalov
> Attachments: hadoop-hanging.tar
>
>
> When using MiniDFSCluster in a unit test it works and terminates as expected.
> However creating and shutting it down from a main causes it to hang.
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