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https://issues.apache.org/jira/browse/SPARK-17829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15605879#comment-15605879
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Apache Spark commented on SPARK-17829:
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User 'tcondie' has created a pull request for this issue:
https://github.com/apache/spark/pull/15626
> 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
> Assignee: Tyson Condie
>
> 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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