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https://issues.apache.org/jira/browse/HIVE-1806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12971987#action_12971987
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Ning Zhang commented on HIVE-1806:
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dyn_part_empty.q is having intermittent failures. I tried the clean trunk and 
it sometimes fails as well. The failure is not critical -- exception was 
printed to log file rather than console. It should not be caused by this patch.

However, I did find 2 diffs in skewjoin.q and bucketmapjoin2.q. The former has 
a simple fix. I'm looking at why bucketmapjoin2.q has a slightly different 
plan. 

> The merge criteria on dynamic partitons should be per partiton
> --------------------------------------------------------------
>
>                 Key: HIVE-1806
>                 URL: https://issues.apache.org/jira/browse/HIVE-1806
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Ning Zhang
>            Assignee: Ning Zhang
>         Attachments: HIVE-1806.patch
>
>
> Currently the criteria of whether a merge job should be fired on dynamic 
> generated partitions are is the average file size of files across all dynamic 
> partitions. It is very common that some dynamic partitions contains mostly 
> large files and some contains mostly small files. Even though the average 
> size of the total files are larger than the hive.merge.smallfiles.avgsize, we 
> should merge those partitions containing small files only. 

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