[FLINK-4492] Cleanup files from canceled snapshots

[Nikolay Vasilishin]

Hi, dev.

I've been working on FLINK-4492 issue, but couldn't reproduce the bug. As I mentioned in comment<https://issues.apache.org/jira/browse/FLINK-4492?focusedCommentId=15581831&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15581831>, FsCheckpointStreamFactory properly deletes all checkpoint files even if job is cancelled.
So the question is if anybody met this bug? Does this issue still persist?
Maybe I misunderstood the issue.

Best regards,

Nikolay Vasilishin
Junior Software Engineer

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