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https://issues.apache.org/jira/browse/FLINK-28984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17580061#comment-17580061
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Yun Tang commented on FLINK-28984:
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I think the second analysis looks a bit weird. If the FSDataOutputStream has
not been created, it will not call
{{FsCheckpointStateOutputStream#createStream}} , which means we will not get
the generated random path.
The SafetyNetCloseableRegistry would help close the unreleased closable on JVM
GC, it must be we forget to close them in somewhere.
> FsCheckpointStateOutputStream is not being released normally
> ------------------------------------------------------------
>
> Key: FLINK-28984
> URL: https://issues.apache.org/jira/browse/FLINK-28984
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing
> Affects Versions: 1.11.6, 1.15.1
> Reporter: ChangjiGuo
> Priority: Major
>
> If the checkpoint is aborted, AsyncSnapshotCallable will close the
> snapshotCloseableRegistry when it is canceled. There may be two situations
> here:
> # The FSDataOutputStream has been created and closed while closing
> FsCheckpointStateOutputStream.
> # The FSDataOutputStream has not been created yet, but closed flag has been
> set to true. You can see this in log:
> {code:java}
> 2022-08-16 12:55:44,161 WARN
> org.apache.flink.core.fs.SafetyNetCloseableRegistry - Closing
> unclosed resource via safety-net:
> ClosingFSDataOutputStream(org.apache.flink.runtime.fs.hdfs.HadoopDataOutputStream@4ebe8e64)
> :
> xxxxx/flink/checkpoint/state/9214a2e302904b14baf2dc1aacbc7933/ae157c5a05a8922a46a179cdb4c86b10/shared/9d8a1e92-2f69-4ab0-8ce9-c1beb149229a
> {code}
> The output stream will be automatically closed by the
> SafetyNetCloseableRegistry but the file will not be deleted.
> The second case usually occurs when the storage system has high latency in
> creating files.
> How to reproduce?
> This is not easy to reproduce, but you can try to set a smaller checkpoint
> timeout and increase the parallelism of the flink job.
>
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