HA: re-enable NO_ACK optimization for block deletion
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Key: HDFS-2973
URL: https://issues.apache.org/jira/browse/HDFS-2973
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha, name-node
Affects Versions: HA branch (HDFS-1623)
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Currently in trunk, when a file is removed, the deletion request is sent to the
DNs with a special NO_ACK flag to indicate that they don't need to ACK the
deletion. The NN itself takes care of removing the blocks from the block map,
so the deletion report would be redundant.
In the HA branch, we disabled this to fix a failure in TestSafeMode -- when the
active NN issues a block deletion, and the standby hasn't read the edits yet,
this test case expects that it would see the block deletions.
I don't see any actual compelling reasons for this. I think we can restore the
optimization and modify the test to pass.
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