[jira] [Commented] (HIVE-6043) Document incompatible changes in Hive 0.12 and trunk

["Yin Huai (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-6043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13850759#comment-13850759 ] 

Yin Huai commented on HIVE-6043:
--------------------------------

I added HIVE-4827, which removed the flag of "hive.optimize.mapjoin.mapreduce".

> Document incompatible changes in Hive 0.12 and trunk
> ----------------------------------------------------
>
>                 Key: HIVE-6043
>                 URL: https://issues.apache.org/jira/browse/HIVE-6043
>             Project: Hive
>          Issue Type: Task
>            Reporter: Brock Noland
>            Priority: Blocker
>
> We need to document incompatible changes. For example
> * HIVE-5372 changed object inspector hierarchy breaking most if not all custom serdes
> * HIVE-1511/HIVE-5263 serializes ObjectInspectors with Kryo so all custom serdes (fixed by HIVE-5380)
> * Hive 0.12 separates MapredWork into MapWork and ReduceWork which is used by Serdes
> * HIVE-5411 serializes expressions with Kryo which are used by custom serdes
> * HIVE-4827 removed the flag of "hive.optimize.mapjoin.mapreduce" (This flag was introduced in Hive 0.11 by HIVE-3952).



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