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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-1548) Optimize scalar to consolidate the part file
Date Wed, 18 Aug 2010 00:52:17 GMT

     [ https://issues.apache.org/jira/browse/PIG-1548?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Dai updated PIG-1548:
----------------------------

        Summary: Optimize scalar to consolidate the part file  (was: Optimize scalar to use
distributed cache )
    Description: Current scalar implementation will write a scalar file onto dfs. When Pig
need the scalar, it will open the dfs file directly. Each scalar file contains more than one
part file though it contains only one record. This puts a huge load to namenode. We should
consolidate part file before open it. Another optional step is put the consolicated file into
distributed cache. This further bring down the load of namenode.  (was: Current scalar implementation
will write a scalar file onto dfs. When Pig need the scalar, it will open the dfs file directly.
This puts a huge load to namenode. We should use distributed cache for scalar file.)

> Optimize scalar to consolidate the part file
> --------------------------------------------
>
>                 Key: PIG-1548
>                 URL: https://issues.apache.org/jira/browse/PIG-1548
>             Project: Pig
>          Issue Type: Improvement
>          Components: impl
>            Reporter: Daniel Dai
>            Assignee: Thejas M Nair
>             Fix For: 0.8.0
>
>
> Current scalar implementation will write a scalar file onto dfs. When Pig need the scalar,
it will open the dfs file directly. Each scalar file contains more than one part file though
it contains only one record. This puts a huge load to namenode. We should consolidate part
file before open it. Another optional step is put the consolicated file into distributed cache.
This further bring down the load of namenode.

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