[jira] [Created] (FLINK-5285) CancelCheckpointMarker flood when using at least once mode

["Till Rohrmann (JIRA)" <ji...@apache.org>]

Till Rohrmann created FLINK-5285:
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             Summary: 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: 1.1.3, 1.2.0
            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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