Biao Liu created FLINK-13905:
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Summary: Separate checkpoint triggering into stages
Key: FLINK-13905
URL: https://issues.apache.org/jira/browse/FLINK-13905
Project: Flink
Issue Type: Sub-task
Components: Runtime / Coordination
Reporter: Biao Liu
Fix For: 1.10.0
Currently {{CheckpointCoordinator#triggerCheckpoint}} includes some heavy IO
operations. We plan to separate the triggering into different stages. The IO
operations are executed in IO threads, while other on-memory operations are not.
This is a preparation for making all on-memory operations of
{{CheckpointCoordinator}} single threaded (in main thread).
Note that we could not put on-memory operations of triggering into main thread
directly now. Because there are still some operations on a heavy lock
(coordinator-wide).
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