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https://issues.apache.org/jira/browse/FLINK-17988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17118147#comment-17118147
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Roman Khachatryan commented on FLINK-17988:
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The problem is in duplicated discard calls for channel state handles.
> Checkpointing slows down after reaching state.checkpoints.num-retained
> ----------------------------------------------------------------------
>
> Key: FLINK-17988
> URL: https://issues.apache.org/jira/browse/FLINK-17988
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing
> Affects Versions: 1.11.0
> Reporter: Roman Khachatryan
> Assignee: Roman Khachatryan
> Priority: Major
> Labels: pull-request-available
> Attachments: flink-conf.yaml, jobmanager.s3a.dmp, jobmanager.s3p.dmp
>
>
> With Unaligned checkpoints, happens always (new checkpoint is never started
> or triggered).
> With Aligned checkpoints - to some degree - depending on state size and
> thresholds: delayed by 1 minute. Delay grows very slowly with state size.
>
> Filesystems: s3p and s3a
> Parallelism: 176, repartition (num stages): 5.
> Number of files in checkpoint is about 1K (depends on
> state.backend.fs.memory-threshold and their size). Size doesn't matter
> (100K..10G).
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