Karen Coppage created HADOOP-17267:
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             Summary: Add debug-level logs in Filesystem#close
                 Key: HADOOP-17267
                 URL: https://issues.apache.org/jira/browse/HADOOP-17267
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Karen Coppage


HDFS reuses the same cached FileSystem object across the file system. If the 
client calls FileSystem.close(), closeAllForUgi(), or closeAll() (if it applies 
to the instance) anywhere in the system it purges the cache of that FS 
instance, and trying to use the instance results in an IOException: FileSystem 
closed.

It would be a great help to clients to see where and when a given FS instance 
was closed. I.e. in close(), closeAllForUgi(), or closeAll(), it would be great 
to see a DEBUG-level log of
 * calling method name, class, file name/line number
 * FileSystem object's identity hash (FileSystem.close() only)



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