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Posted to issues@spark.apache.org by "Michael Armbrust (JIRA)" <ji...@apache.org> on 2016/10/07 16:24:20 UTC

[jira] [Created] (SPARK-17829) Stable format for offset log

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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