Chris Nauroth created HADOOP-9993:
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             Summary: FileSystem#close JavaDoc should state that the 
implementation must be idempotent.
                 Key: HADOOP-9993
                 URL: https://issues.apache.org/jira/browse/HADOOP-9993
             Project: Hadoop Common
          Issue Type: Improvement
          Components: documentation, fs
            Reporter: Chris Nauroth


In discussion during MAPREDUCE-5508, we realized that any {{FileSystem}} 
subclass must implement an idempotent {{close}} method, due to potential 
multi-threaded interactions with the {{FileSystem#Cache}}.  We should state 
this in the JavaDoc for {{FileSystem#close}}, so that subclass implementers are 
aware.

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