Till Rohrmann closed FLINK-6523.
    Resolution: Won't Do

No longer valid.

> Improve lifecycle management of created BlobCaches in TaskManagerLogHandler 
> and JobClient
> -----------------------------------------------------------------------------------------
>                 Key: FLINK-6523
>                 URL: https://issues.apache.org/jira/browse/FLINK-6523
>             Project: Flink
>          Issue Type: Bug
>          Components: Runtime / Coordination
>    Affects Versions: 1.3.0, 1.4.0
>            Reporter: Till Rohrmann
>            Priority: Major
> Some components like the {{JobClient#retrieveClassLoader}} and 
> {{TaskManagerLogHandler}} create {{BlobCaches}} to retrieve data from the 
> {{BlobServer}}. These instances are created in a local context and their 
> lifecycle is not properly managed. The cleanup/closing solely relies on the 
> fact that their storage directory will be cleaned up eventually by a 
> registered shutdown hook.
> I think it would be better to properly implement a lifecycle management for 
> these components and close them at an appropriate location in the code. E.g. 
> one could pass in a shared {{BlobCache}} which is closed once the JobClient 
> action is over.

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