Till Rohrmann created FLINK-10352:
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Summary: Bind Task's URLClassLoader to TaskExecutor's slot
Key: FLINK-10352
URL: https://issues.apache.org/jira/browse/FLINK-10352
Project: Flink
Issue Type: Improvement
Components: Distributed Coordination
Affects Versions: 1.6.0, 1.5.3, 1.7.0
Reporter: Till Rohrmann
Fix For: 1.7.0
The {{Task's}} {{URLClassLoader}} is used to dynamically load user code
classes. The lifetime of this class loader is bound to the {{Task}} and, thus,
it can happen that we generate multiple class loader for the same job if
multiple {{Tasks}} are deployed to the same slot successively.
We could avoid this situation by binding the lifetime of the {{URLClassLoader}}
to the slot instead of the {{Task}}. The slot will only be released if the
{{JobMaster}} no longer needs it. That way we won't potentially recreate the
{{URLClassLoader}} for every submitted {{Task}}.
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