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https://issues.apache.org/jira/browse/FLINK-7844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16206017#comment-16206017
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Till Rohrmann edited comment on FLINK-7844 at 10/16/17 2:54 PM:
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Hi [~zhenzhongxu],
thanks for the feedback. The checkpoint timeout is currently hardcoded to 10
minutes. We should definitely expose this to the user via a configuration
option.
Moreover, it looks to me as if we don't fail the currently ongoing checkpoint
in case of a fine grained recovery. We also don't resend the checkpoint
barriers for the restarted component. Therefore, the checkpoint will never
complete and the {{CheckpointCoordinator}} will wait until the checkpoint times
out. The easiest solution should be to fail all currently ongoing checkpoints
upon fine grained recovery. That's also what happens in the case of a global
recovery.
I will split this issue into two issues. One adding the configuration option
for the timeout and this one for aborting of all currently ongoing checkpoints.
was (Author: till.rohrmann):
Hi [~zhenzhongxu],
thanks for the feedback. The checkpoint timeout is currently hardcoded to 10
minutes. We should definitely expose this to the user via a configuration
option.
Moreover, it looks to me as if we don't fail the currently ongoing checkpoint
in case of a fine grained recovery. We also don't resend the checkpoint
barriers for the restarted component. Therefore, the checkpoint will never
complete and the {{CheckpointCoordinator}} will wait until the checkpoint times
out. The easiest solution should be to fail all currently ongoing checkpoints
upon fine grained recovery. That's also what happens in the case of a global
recovery.
I will split this issue into two issues. One adding the configuration option
for the timeout and this one for the abort of all currently ongoing checkpoints.
> Fine Grained Recovery triggers checkpoint timeout failure
> ---------------------------------------------------------
>
> Key: FLINK-7844
> URL: https://issues.apache.org/jira/browse/FLINK-7844
> Project: Flink
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.3.2
> Reporter: Zhenzhong Xu
> Attachments: screenshot-1.png
>
>
> Context:
> We are using "individual" failover (fine-grained) recovery strategy for our
> embarrassingly parallel router use case. The topic has over 2000 partitions,
> and parallelism is set to ~180 that dispatched to over 20 task managers with
> around 180 slots.
> Observations:
> We've noticed after one task manager termination, even though the individual
> recovery happens correctly, that the workload was re-dispatched to a new
> available task manager instance. However, the checkpoint would take 10 mins
> to eventually timeout, causing all other task managers not able to commit
> checkpoints. In a worst-case scenario, if job got restarted for other reasons
> (i.e. job manager termination), that would cause more messages to be
> re-processed/duplicates compared to the job without fine-grained recovery
> enabled.
> I am suspecting that uber checkpoint was waiting for a previous checkpoint
> that initiated by the old task manager and thus taking a long time to time
> out.
> Two questions:
> 1. Is there a configuration that controls this checkpoint timeout?
> 2. Is there any reason that when Job Manager realizes that Task Manager is
> gone and workload is redispatched, it still need to wait for the checkpoint
> initiated by the old task manager?
> Checkpoint screenshot in attachments.
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