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Posted to issues@flink.apache.org by "vinoyang (JIRA)" <ji...@apache.org> on 2019/05/16 07:28:00 UTC
[jira] [Commented] (FLINK-10855) CheckpointCoordinator does not
delete checkpoint directory of late/failed checkpoints
[ https://issues.apache.org/jira/browse/FLINK-10855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16841056#comment-16841056 ]
vinoyang commented on FLINK-10855:
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Hi [~till.rohrmann], Recently [~stefanrichter83@gmail.com] has helped me introduced a {{CheckpointFailureManager}} component and we have combed checkpoint exceptions. Just an idea, can we introduce a checkpoint cleaner for it (or let it alone). It will do the clean work for the failed checkpoint. WDYT? cc [~yunta]
> CheckpointCoordinator does not delete checkpoint directory of late/failed checkpoints
> -------------------------------------------------------------------------------------
>
> Key: FLINK-10855
> URL: https://issues.apache.org/jira/browse/FLINK-10855
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing
> Affects Versions: 1.5.5, 1.6.2, 1.7.0
> Reporter: Till Rohrmann
> Assignee: vinoyang
> Priority: Major
>
> In case that an acknowledge checkpoint message is late or a checkpoint cannot be acknowledged, we discard the subtask state in the {{CheckpointCoordinator}}. What's not happening in this case is that we delete the parent directory of the checkpoint. This only happens when we dispose a {{PendingCheckpoint#dispose}}.
> Due to this behaviour it can happen that a checkpoint fails (e.g. a task not being ready) and we delete the checkpoint directory. Next another task writes its checkpoint data to the checkpoint directory (thereby creating it again) and sending an acknowledge message back to the {{CheckpointCoordinator}}. The {{CheckpointCoordinator}} will realize that there is no longer a {{PendingCheckpoint}} and will discard the sub task state. This will remove the state files from the checkpoint directory but will leave the checkpoint directory untouched.
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