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https://issues.apache.org/jira/browse/FLINK-6684?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bowen Li closed FLINK-6684.
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Resolution: Invalid
> Remove AsyncCheckpointRunnable from StreamTask
> ----------------------------------------------
>
> Key: FLINK-6684
> URL: https://issues.apache.org/jira/browse/FLINK-6684
> Project: Flink
> Issue Type: Improvement
> Components: State Backends, Checkpointing
> Reporter: Stefan Richter
> Assignee: Bowen Li
>
> Right now, {{StreamTask}} executes {{AsyncCheckpointRunnable}} to run the
> async part of a snapshot. However, it seems that currently the main reason
> for executing this code in a separate tread is to avoid its execution under
> the checkpoint lock, so that processing can proceed.
> Actually, the checkpoint is already triggered asynchronously, in
> {{Task::triggerCheckpointBarrier}}. We could also execute the checkpointing
> without executing {{AsyncCheckpointRunnable}}, by just running the code
> inside the thread that is spawned in {{Task::triggerCheckpointBarrier}}. We
> could simply
> 1) Run the synchronous part of the checkpoint under the checkpointing lock.
> 2) Run the asynchronous part of the checkpoint without holding the
> checkpointing lock.
> 3) Returning a {{Future}} from {{StatefulTask::triggerCheckpoint}} when
> called from {{Task::triggerCheckpointBarrier}}.
> This would simplify the code and make the usage of the
> {{SafetyNetCloseableRegistry}} possible as intended.
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