TisonKun commented on issue #10408: [FLINK-14992][client] Add job listener to execution environments URL: https://github.com/apache/flink/pull/10408#issuecomment-561553419 @aljoscha I rewrite `doClose` as described above & see also [this comment](https://github.com/apache/flink/pull/10413#issuecomment-561515078). One thing I find different from your statement "return a duplicate JobClient on `executeAsync`". It wouldn't be true. No one take ownership of the JobClient return by `Executor#execute` in `executeAsync`. We simply returns it and in another perspective, that JobClient should be called `close` by someone(here the caller of `executeAsync` to ensure the specific close actions executed)
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