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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4449) When a decommission is awaiting closure of live blocks, show the block IDs on the NameNode's UI report
Date Tue, 29 Jan 2013 05:27:12 GMT
Harsh J created HDFS-4449:
-----------------------------

             Summary: When a decommission is awaiting closure of live blocks, show the block
IDs on the NameNode's UI report
                 Key: HDFS-4449
                 URL: https://issues.apache.org/jira/browse/HDFS-4449
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Harsh J
            Assignee: Harsh J


It is rather common for people to be complaining about 'DN decommission' hangs cause of live
blocks waiting to get completed by some app (especially certain HBase specifics cause a file
to be open for a longer time, as compared with MR/etc.).

While they can see a count of the blocks that are live, we should add some more details to
that view. Particularly add the list of live blocks waiting to be closed, so that a user may
understand better on why its hung and also be able to trace back the block to files manually
if needed.

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