Dmitry Lysnichenko created AMBARI-4323:
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Summary: Add ability to an agent to clear the ActionQueue
Key: AMBARI-4323
URL: https://issues.apache.org/jira/browse/AMBARI-4323
Project: Ambari
Issue Type: Improvement
Components: agent, controller
Affects Versions: 1.5.0
Reporter: Dmitry Lysnichenko
Assignee: Dmitry Lysnichenko
Fix For: 1.5.0
- add new command type CLEAR_QUEUE both on agent and server
- server sends this command:
1) when some command times out
2) after agent registration (to cancel any commands from the previous session)
- add new possible command report state ABORTED to the server
- when agent receives CLEAR_QUEUE command, it immediately removes all scheduled
commands from the queue and for every command in the queue send the command
report with ABORTED state.
Some notes on implementation:
Cancelling commands that are not executed yet requires relatively small effort.
Cancelling command in progress is possible (we may invoke kill-on-timeout
callback method manually or via event, effectively killing all subprocesses),
but may occasionally leave system configuration in a broken state.
Or, instead of clear Queue, we should probably send KILL TASK or something to
kill specific tasks or remove them in the queue. If we choose to do so, we may
also manage task timeouts only at the server.
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