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https://issues.apache.org/jira/browse/HIVE-6043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13850810#comment-13850810
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Sergey Shelukhin commented on HIVE-6043:
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HIVE-4914? It does have backward compat
> 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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