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From "Cody Koeninger (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-17829) Stable format for offset log
Date Thu, 20 Oct 2016 21:02:59 GMT

    [ https://issues.apache.org/jira/browse/SPARK-17829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15593000#comment-15593000
] 

Cody Koeninger commented on SPARK-17829:
----------------------------------------

At least with regard to kafka offsets, it might be good to keep this the same format as in
SPARK-17812

> 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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