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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