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https://issues.apache.org/jira/browse/FLINK-5285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15735338#comment-15735338
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ASF GitHub Bot commented on FLINK-5285:
---------------------------------------
Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/2963
Thanks for the review @StephanEwen. Merging...
> CancelCheckpointMarker flood when using at least once mode
> ----------------------------------------------------------
>
> Key: FLINK-5285
> URL: https://issues.apache.org/jira/browse/FLINK-5285
> Project: Flink
> Issue Type: Bug
> Components: State Backends, Checkpointing
> Affects Versions: 1.2.0, 1.1.3
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
> Fix For: 1.2.0, 1.1.4
>
>
> When using at least once mode ({{BarrierTracker}}), then an interleaved
> arrival of cancellation barriers at the {{BarrierTracker}} of two consecutive
> checkpoints can trigger a flood of {{CancelCheckpointMarkers}}.
> The following sequence is problematic:
> {code}
> Cancel(1, 0),
> Cancel(2, 0),
> Cancel(1, 1),
> Cancel(2, 1),
> Cancel(1, 2),
> Cancel(2, 2)
> {code}
> with {{Cancel(checkpointId, channelId)}}
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