create(file, true) appears to be violating atomicity
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Key: HDFS-1563
URL: https://issues.apache.org/jira/browse/HDFS-1563
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.20.1
Reporter: Guanghao Shen
Assignee: dhruba borthakur
Will upload a unittest to reveal this bug.
In a word, when a thread is doing create(file, true) on existing file, there
are chances that another thread will get 'false' for exists(file) during the
period.
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