[SPARK-55476] Refactor broadcast variable protocol #54258
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What changes were proposed in this pull request?
Refactored the broadcast variable protocol from random value being sent to a json-based structured message.
Why are the changes needed?
It's part of the effort to make protocol between JVM and the workers more stable and easier to understand.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Tried it on some relevant tests locally and they passed. Need CI to validate the rest.
Was this patch authored or co-authored using generative AI tooling?
No.