[jira] [Created] (FLINK-6523) Improve lifecycle management of created BlobCaches in TaskManagerLogHandler and JobClient

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-6523:
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             Summary: 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: Distributed Coordination
    Affects Versions: 1.3.0, 1.4.0
            Reporter: Till Rohrmann


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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