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Posted to dev@flink.apache.org by "Chesnay Schepler (Jira)" <ji...@apache.org> on 2023/04/24 09:35:00 UTC

[jira] [Created] (FLINK-31919) Skip ClosureCleaner if object can be serialized

Chesnay Schepler created FLINK-31919:
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             Summary: Skip ClosureCleaner if object can be serialized
                 Key: FLINK-31919
                 URL: https://issues.apache.org/jira/browse/FLINK-31919
             Project: Flink
          Issue Type: Sub-task
          Components: API / Core
            Reporter: Chesnay Schepler
            Assignee: Chesnay Schepler
             Fix For: 1.18.0


Given an object the ClosureCleaner currently recursively digs into every non-static/transient field of the given object. This causes a problem on Java 17 because these reflective accesses all need to be explicitly allowed beforehand.

Instead, we could limit the CC to objects that fail serialization, because if something can be serialized there isn't anything for the CC to do.
This should allow us to avoid a lot of unnecessary reflection accesses to immutable JDK classes, like Strings/BigDecimals etc etc.



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