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https://issues.apache.org/jira/browse/FLINK-12858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16891070#comment-16891070
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Till Rohrmann commented on FLINK-12858:
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[~kkl0u] had a comment whether to add a test or not. I would be in favour of
guarding this fix with a test case.
> Potential distributed deadlock in case of synchronous savepoint failure
> -----------------------------------------------------------------------
>
> Key: FLINK-12858
> URL: https://issues.apache.org/jira/browse/FLINK-12858
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing
> Affects Versions: 1.9.0
> Reporter: Alex
> Assignee: Alex
> Priority: Blocker
> Fix For: 1.9.0
>
>
> Current implementation of stop-with-savepoint (FLINK-11458) would lock the
> thread (on {{syncSavepointLatch}}) that carries
> {{StreamTask.performCheckpoint()}}. For non-source tasks, this thread is
> implied to be the task's main thread (stop-with-savepoint deliberately stops
> any activity in the task's main thread).
> Unlocking happens either when the task is cancelled or when the corresponding
> checkpoint is acknowledged.
> It's possible, that other downstream tasks of the same Flink job "soft" fail
> the checkpoint/savepoint due to various reasons (for example, due to max
> buffered bytes {{BarrierBuffer.checkSizeLimit()}}. In such case, the
> checkpoint abortion would be notified to JM . But it looks like, the
> checkpoint coordinator would handle such abortion as usual and assume that
> the Flink job continues running.
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