Stephen O'Donnell created HDDS-2449:
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Summary: Delete block command should use a thread pool
Key: HDDS-2449
URL: https://issues.apache.org/jira/browse/HDDS-2449
Project: Hadoop Distributed Data Store
Issue Type: Improvement
Components: Ozone Datanode
Affects Versions: 0.5.0
Reporter: Stephen O'Donnell
Assignee: Stephen O'Donnell
The datanode receives commands over the heartbeat and queues all commands on a
single queue in StateContext.commandQueue. Inside DatanodeStateMachine a single
thread is used to process this queue (started by initCommandHander thread) and
it passes each command to a ‘handler’. Each command type has its own handler.
The delete block command immediately executes the command on the thread used to
process the command queue. Therefore if the delete is slow for some reason (it
must access disk, so this is possible) it could cause other commands to backup.
This should be changed to use a threadpool to queue the deleteBlock command, in
a similar way to ReplicateContainerCommand.
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