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From "Mostafa Mokhtar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-10704) Errors in Tez HashTableLoader when estimated table size is 0
Date Fri, 22 May 2015 19:15:17 GMT

    [ https://issues.apache.org/jira/browse/HIVE-10704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14556665#comment-14556665
] 

Mostafa Mokhtar commented on HIVE-10704:
----------------------------------------

Test failures are unrelated.

> Errors in Tez HashTableLoader when estimated table size is 0
> ------------------------------------------------------------
>
>                 Key: HIVE-10704
>                 URL: https://issues.apache.org/jira/browse/HIVE-10704
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>            Reporter: Jason Dere
>            Assignee: Mostafa Mokhtar
>             Fix For: 1.2.1
>
>         Attachments: HIVE-10704.1.patch, HIVE-10704.2.patch, HIVE-10704.3.patch
>
>
> Couple of issues:
> - If the table sizes in MapJoinOperator.getParentDataSizes() are 0 for all tables, the
largest small table selection is wrong and could select the large table (which results in
NPE)
> - The memory estimates can either divide-by-zero, or allocate 0 memory if the table size
is 0. Try to come up with a sensible default for this.



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