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From "Corinne Chandel (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-978) ERROR 2100 (hdfs://localhost/tmp/temp175740929/tmp-1126214010 does not exist) and ERROR 2999: (Unexpected internal error. null) when using Multi-Query optimization
Date Mon, 30 Nov 2009 22:11:20 GMT

     [ https://issues.apache.org/jira/browse/PIG-978?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Corinne Chandel updated PIG-978:
--------------------------------

    Status: Patch Available  (was: Open)

Apply patch to trunk: http://svn.apache.org/repos/asf/hadoop/pig/trunk

Note: No new test code required; changes to documentation only.

> ERROR 2100 (hdfs://localhost/tmp/temp175740929/tmp-1126214010 does not exist) and ERROR
2999: (Unexpected internal error. null) when using Multi-Query optimization
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: PIG-978
>                 URL: https://issues.apache.org/jira/browse/PIG-978
>             Project: Pig
>          Issue Type: Bug
>          Components: documentation
>    Affects Versions: 0.6.0
>            Reporter: Viraj Bhat
>            Assignee: Corinne Chandel
>             Fix For: 0.6.0
>
>         Attachments: pig-latin-users-guide.patch
>
>
> I have  Pig script of this form.. which I execute using Multi-query optimization.
> {code}
> A = load '/user/viraj/firstinput' using PigStorage();
> B = group ....
> C = ..agrregation function
> store C into '/user/viraj/firstinputtempresult/days1';
> ..
> Atab = load '/user/viraj/secondinput' using PigStorage();
> Btab = group ....
> Ctab = ..agrregation function
> store Ctab into '/user/viraj/secondinputtempresult/days1';
> ..
> E = load '/user/viraj/firstinputtempresult/' using PigStorage();
> F = group 
> G = aggregation function
> store G into '/user/viraj/finalresult1';
> Etab = load '/user/viraj/secondinputtempresult/' using PigStorage();
> Ftab = group 
> Gtab = aggregation function
> store Gtab into '/user/viraj/finalresult2';
> {code}
> 2009-07-20 22:05:44,507 [main] ERROR org.apache.pig.tools.grunt.GruntParser - ERROR 2100:
hdfs://localhost/tmp/temp175740929/tmp-1126214010 does not exist. Details at logfile: /homes/viraj/pigscripts/pig_1248127173601.log)
 
> is due to the mismatch of store/load commands. The script first stores files into the
'days1' directory (store C into '/user/viraj/firstinputtempresult/days1' using PigStorage();),
but it later loads from the top level directory (E = load '/user/viraj/firstinputtempresult/'
using PigStorage()) instead of the original directory (/user/viraj/firstinputtempresult/days1).
> The current multi-query optimizer can't solve the dependency between these two commands--they
have different load file paths. So the jobs will run concurrently and result in the errors.
> The solution is to add 'exec' or 'run' command after the first two stores . This will
force the first two store commands to run before the rest commands.
> It would be nice to see this fixed as a part of an enhancement to the Multi-query. We
either disable the Multi-query or throw a warning/error message, so that the user can correct
his load/store statements.
> Viraj

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