[
https://issues.apache.org/jira/browse/PIG-2652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13254397#comment-13254397
]
Bill Graham commented on PIG-2652:
----------------------------------
FYI, here's my script that reproduces with an initial Map-only job:
{noformat}
L = LOAD 'data1.txt' AS (owner:chararray,pet:chararray,age:int,phone:chararray);
R = LOAD 'data2.txt' AS (owner:chararray,pet:chararray,age:int,phone:chararray);
L2 = FILTER L BY ((int)age > 0);
UNIONED = UNION L, L2;
JOINED = JOIN UNIONED BY owner, R BY owner USING 'skewed';
STORE JOINED INTO 'tmp/skew_join_union';
{noformat}
> Skew join and order by don't trigger reducer estimation
> -------------------------------------------------------
>
> Key: PIG-2652
> URL: https://issues.apache.org/jira/browse/PIG-2652
> Project: Pig
> Issue Type: Bug
> Reporter: Bill Graham
> Assignee: Bill Graham
> Fix For: 0.10.0, 0.9.3, 0.11
>
> Attachments: PIG-2652_1.patch
>
>
> If neither PARALLEL, default parallel or {{mapred.reduce.tasks}} are set, the
> number of reducers is not estimated based on input size for skew joins or
> order by. Instead, these jobs get only 1 reducer.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
