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https://issues.apache.org/jira/browse/FLINK-13905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16964944#comment-16964944
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Biao Liu commented on FLINK-13905:
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[~pnowojski],
{quote}If all things equal, I would prefer to postpone FLINK-13848 as much as
possible, as that would be another chunk of code to review/maintain.{quote}
Fair enough. FLINK-13848 is quite independent. We could come back to it when we
really need it.
I'll try to write the ideas down to see what it looks like. Maybe we will find
a better solution based on that.
> 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 / Checkpointing
> Reporter: Biao Liu
> Assignee: Biao Liu
> Priority: Major
> 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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