[jira] [Created] (FLINK-10352) Bind Task's URLClassLoader to TaskExecutor's slot

["Till Rohrmann (JIRA)" <ji...@apache.org>]

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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