Michael Armbrust created SPARK-17829:
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Summary: Stable format for offset log
Key: SPARK-17829
URL: https://issues.apache.org/jira/browse/SPARK-17829
Project: Spark
Issue Type: Sub-task
Components: SQL
Reporter: Michael Armbrust
Currently we use java serialization for the WAL that stores the offsets
contained in each batch. This has two main issues:
- It can break across spark releases (though this is not the only thing
preventing us from upgrading a running query)
- It is unnecessarily opaque to the user.
I'd propose we require offsets to provide a user readable serialization and use
that instead. JSON is probably a good option.
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