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

["Shixiong Zhu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-17829?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shixiong Zhu resolved SPARK-17829.
----------------------------------
    Resolution: Fixed

> Stable format for offset log
> ----------------------------
>
>                 Key: SPARK-17829
>                 URL: https://issues.apache.org/jira/browse/SPARK-17829
>             Project: Spark
>          Issue Type: Improvement
>          Components: Structured Streaming
>            Reporter: Michael Armbrust
>            Assignee: Tyson Condie
>             Fix For: 2.1.0
>
>
> 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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