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https://issues.apache.org/jira/browse/HIVE-6262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13883389#comment-13883389
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Vikram Dixit K commented on HIVE-6262:
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This is really good in terms of memory efficiency. LGTM +1.
> Remove unnecessary copies of schema + table desc from serialized plan
> ---------------------------------------------------------------------
>
> Key: HIVE-6262
> URL: https://issues.apache.org/jira/browse/HIVE-6262
> Project: Hive
> Issue Type: Bug
> Reporter: Gunther Hagleitner
> Assignee: Gunther Hagleitner
> Attachments: HIVE-6262.1.patch
>
>
> Currently for a partitioned table the following are true:
> - for each partitiondesc we send a copy of the corresponding tabledesc
> - for each partitiondesc we send two copies of the schema (in different
> formats).
> Obviously we need to send different schemas if they are required by schema
> evolution, but in our case we'll always end up with multiple copies.
> The effect can be dramatic. The reductions by removing those on partitioned
> tables easily be can be 8-10x in size. Plans themselves can be 10s to 100s of
> mb (even with kryo). The size difference also plays out in every task on the
> cluster we run.
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