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https://issues.apache.org/jira/browse/HDFS-956?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon resolved HDFS-956.
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Resolution: Duplicate
HDFS-988 will cover these as well.
> Improper synchronization in some FSNamesystem methods
> -----------------------------------------------------
>
> Key: HDFS-956
> URL: https://issues.apache.org/jira/browse/HDFS-956
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 0.21.0, 0.22.0
> Reporter: Todd Lipcon
>
> There are some methods in FSNamesystem that check isInSafeMode while not
> synchronized, and then proceed to perform operations. Thus the actual
> operations can occur after the NN has entered safemode, which is no good.
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