Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/5740
I agree that having a single shut down hook for cleaning up the temp
directory is the best solution. I think that the `TaskManager` does not
properly do it like you've described. The `TaskExecutorLocalStateStoresManager`
registers its own shut down hooks and most of the `TaskManager` components like
`BlobCache`, `FileCache` and `IOManager` do so likewise.
The upload directory is a good point. With my changes it will always be
deleted. If this is not the intended behaviour, then I will adapt it
accordingly.
In order to not widen the scope of this task too much I would suggest the
following:
1. Addressing the general problem of reducing the number of shut down hooks
in a separate issue
2. Creating a a sub directory in `WebOptions#TMP_DIR` which is set up and
cleaned up by the `ClusterEntrypoint` and its shut down hook
What do you think @StephanEwen.
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