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https://issues.apache.org/jira/browse/FLINK-14971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16998311#comment-16998311
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Gary Yao commented on FLINK-14971:
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Parent issue has fix version 1.11 now.
> Move ACK and declined message handling in the same thread with triggering
> -------------------------------------------------------------------------
>
> Key: FLINK-14971
> URL: https://issues.apache.org/jira/browse/FLINK-14971
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Checkpointing
> Reporter: Biao Liu
> Priority: Major
> Fix For: 1.11.0
>
>
> Currently the ACK and declined message handling are executed in IO thread. It
> should be moved into main thread eventually.
> After this step, all operations could be executed in main thread. Also we
> don't need coordinator-wide lock anymore then.
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