Improper synchronization in some FSNamesystem methods
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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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