Harsh J created HDFS-4449:
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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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