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https://issues.apache.org/jira/browse/FLINK-10963?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kostas Kloudas closed FLINK-10963.
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Resolution: Fixed
Merged to master with bf5dc6c8bac73e7f8d54e983be2080cf6ce48a94
and to release-1.7 with 5de507835b2b9a93376820b79a435b8efe53b8a6
> Cleanup small objects uploaded to S3 as independent objects
> -----------------------------------------------------------
>
> Key: FLINK-10963
> URL: https://issues.apache.org/jira/browse/FLINK-10963
> Project: Flink
> Issue Type: Sub-task
> Components: filesystem-connector
> Affects Versions: 1.7.0
> Reporter: Kostas Kloudas
> Assignee: Kostas Kloudas
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.7.1
>
>
> The S3 {{RecoverableWriter}} uses the Multipart Upload (MPU) Feature of S3 in
> order to upload the different part files. This means that a large part is
> split in chunks of at least 5MB which are uploaded independently, whenever
> each one of them is ready.
> This 5MB minimum size requires special handling of parts that are less than
> 5MB when a checkpoint barrier arrives. These small files are uploaded as
> independent objects (not associated with an active MPU). This way, when Flink
> needs to restore, it simply downloads them and resumes writing to them.
> These small objects are currently not cleaned up, thus leading to wasted
> space on S3.
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