[jira] Assigned: (PIG-1144) set default_parallelism construct does not set the number of reducers correctly

["Daniel Dai (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-1144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Dai reassigned PIG-1144:
-------------------------------

    Assignee: Daniel Dai

> set default_parallelism construct does not set the number of reducers correctly
> -------------------------------------------------------------------------------
>
>                 Key: PIG-1144
>                 URL: https://issues.apache.org/jira/browse/PIG-1144
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: 0.6.0
>         Environment: Hadoop 20 cluster with multi-node installation
>            Reporter: Viraj Bhat
>            Assignee: Daniel Dai
>             Fix For: 0.7.0
>
>         Attachments: brokenparallel.out, genericscript_broken_parallel.pig, PIG-1144-1.patch
>
>
> Hi all,
>  I have a Pig script where I set the parallelism using the following set construct: "set default_parallel 100" . I modified the "MRPrinter.java" to printout the parallelism
> {code}
> ...
> public void visitMROp(MapReduceOper mr)
> mStream.println("MapReduce node " + mr.getOperatorKey().toString() + " Parallelism " + mr.getRequestedParallelism());
> ...
> {code}
> When I run an explain on the script, I see that the last job which does the actual sort, runs as a single reducer job. This can be corrected, by adding the PARALLEL keyword in front of the ORDER BY.
> Attaching the script and the explain output
> Viraj

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