[jira] [Commented] (PIG-2578) Multiple Store-commands mess up mapred.output.dir.

["Ashutosh Chauhan (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-2578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228506#comment-13228506 ] 

Ashutosh Chauhan commented on PIG-2578:
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I am finding this a bit surprising. If this were to be true, multi-query cannot work effectively, since then both stores using FileOutputFormat will effectively write in same directory, messing up the outputs of each other. I suspect problem may exist in HCatalog. A test-case independent of HCatalog demonstrating Pig bug will be highly appreciated. 
                
> Multiple Store-commands mess up mapred.output.dir.
> --------------------------------------------------
>
>                 Key: PIG-2578
>                 URL: https://issues.apache.org/jira/browse/PIG-2578
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.8.1, 0.9.2
>            Reporter: Mithun Radhakrishnan
>
> When one runs a pig-script with multiple storers, one sees the following:
> 1. When run as a script, Pig launches a single job.
> 2. PigOutputCommitter::setupJob() calls the underlyingOutputCommitter::setupJob(), once for each storer. But the mapred.output.dir is the same for both calls, even though the storers write to different locations. 
> This was originally seen in HCATALOG-276, when HCatalog's end-to-end tests are run against Pig.
> (https://issues.apache.org/jira/browse/HCATALOG-276)
> Sample pig-script (near identical to HCatalog's Pig_Checkin_4 test):
> a = load 'keyvals' using org.apache.hcatalog.pig.HCatLoader();
> split a into b if key<200, c if key >=200;
> store b into 'keyvals_lt200' using org.apache.hcatalog.pig.HCatStorer();
> store c into 'keyvals_ge200' using org.apache.hcatalog.pig.HCatStorer();
> I've suggested a workaround in HCat for the time being, but I think this might be something that needs fixing in Pig.
> Thanks.

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