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https://issues.apache.org/jira/browse/FLINK-31139?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yanfei Lei reassigned FLINK-31139:
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Assignee: Feifan Wang
> not upload empty state changelog file
> -------------------------------------
>
> Key: FLINK-31139
> URL: https://issues.apache.org/jira/browse/FLINK-31139
> Project: Flink
> Issue Type: Bug
> Components: Runtime / State Backends
> Reporter: Feifan Wang
> Assignee: Feifan Wang
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.16.2
>
> Attachments: image-2023-02-20-19-51-34-397.png
>
>
> h1. Problem
> *_BatchingStateChangeUploadScheduler_* will upload many empty changelog files
> (file size == 1 and only contains compressed flag).
> !image-2023-02-20-19-51-34-397.png|width=1062,height=188!
> These files are not referenced by any checkpoints, are not cleaned up, and
> become more numerous as the job runs. Taking our big job as an example, 2292
> such files were generated within 7 hours. It only takes about 4 months and
> the number of files in the changelog directory will exceed a million.
> h1. Problem causes
> This problem is caused by *_BatchingStateChangeUploadScheduler#drainAndSave_*
> not checking whether the task collection is empty. The data in the scheduled
> queue may have been uploaded when the
> _*BatchingStateChangeUploadScheduler#drainAndSave*_ method is executed.
>
> So we should check whether the task collection is empty in
> *_BatchingStateChangeUploadScheduler#drainAndSave_* . WDYT [~roman] ,
> [~Yanfei Lei] ?
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