Hunter L created HELIX-808:
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Summary: TASK: Fix double-booking of tasks with task CurrentStates
Key: HELIX-808
URL: https://issues.apache.org/jira/browse/HELIX-808
Project: Apache Helix
Issue Type: Improvement
Reporter: Hunter L
Assignee: Hunter L
It was observed that TestNoDoubleAssign was failing intermittently. Upon
debugging with more detailed logs, there was a race condition between newly
starting tasks and dropping tasks. To prevent this, dropping state transitions
will be prioritized and prevInstanceToTaskAssignment will be built from
CurrentStates. This is needed to make sure the right number of tasks are
assigned every task pipeline and dropping transitions happen right away.
Changelist:
1\. Change the logic for generating prevInstToTaskAssignment so that it's
based on CurrentState
2\. Add a special check for not updating task partition state upon Participant
connection loss
3\. TestNoDoubleAssign passes consistently
4. Fix TestNoDoubleAssign so that there won't be any thread leak
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