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https://issues.apache.org/jira/browse/FLINK-15132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16992491#comment-16992491
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Stephan Ewen commented on FLINK-15132:
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True, the {{receiveAcknowledgeMessage()}} call itself is no longer in the main
thread since the scheduler refactoring.
I think in that case, we don't need to make this a blocker.
> Checkpoint Coordinator does Checkpoint I/O in JobMaster Main Thread
> -------------------------------------------------------------------
>
> Key: FLINK-15132
> URL: https://issues.apache.org/jira/browse/FLINK-15132
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing
> Reporter: Stephan Ewen
> Priority: Blocker
> Fix For: 1.10.0
>
>
> The {{PendingCheckpoint.completePendingCheckpoint()}} method is called
> synchronously from within the Scheduler / JobMaster Main Thread.
> The method writes out the checkpoint metadata, which is a potentially
> blocking I/O method.
> Because the target may block arbitrarily long (for example S3 when load
> throttling), this can bring down the entire cluster (blocking actor threads,
> heartbeat timeouts).
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