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From "Pi Song (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-120) support hadoop map reduce in loal mode
Date Fri, 29 Feb 2008 09:52:51 GMT

    [ https://issues.apache.org/jira/browse/PIG-120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12573654#action_12573654

Pi Song commented on PIG-120:

+1  with the concept. Allowing Hadoop local execution mode will be very beneficial for testing
with a subset of data before going into production. Theoretically outputs from Pig local and
Hadoop Mapreduce should be exactly the same but sometimes I found that they are different.
In such case, I would trust local hadoop more than Pig local for my development.

So, from the patch, if I want to run local hadoop Pig, I just have to set  cluster and nameNode
properties to "local" right?

> support hadoop map reduce in loal mode
> --------------------------------------
>                 Key: PIG-120
>                 URL: https://issues.apache.org/jira/browse/PIG-120
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Stefan Groschupf
>         Attachments: PIG-120_v_1.patch
> Currently pig support mapreduce and local as execution modes. LocalExecutionEngine is
used for local and HExecutionEngine for map reduce. HExecutionEngine always expect that hadoop
runs as cluster with a name node and jobtracker listing on a port. 
> Though, hadoop can also run in a local mode (LocalJobRunner) this would give several
> First it would speed up the test suite significant. Second it would be possible to debug
map reduce plans easily.
> For example we was able to debug and reproduce PIG-110 with this method.

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