FSNamesystem#internalReleaseLease will throw ArrayIndexOutOfBoundException on
an empty file's lease recovery
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Key: HDFS-812
URL: https://issues.apache.org/jira/browse/HDFS-812
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.21.0, 0.22.0
Reporter: Konstantin Boudnik
{{FSNamesystem.internalReleaseLease()}} uses the result of
{{iFile#numBlocks();}} call to get a number of an under construction file's
blocks. {{numBlock()}} can return 0 if the file doesn't have any blocks yet.
This will cause {{internalReleaseLease()}} to throw
ArrayIndexOutOfBoundException
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