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From "Pradeep Kamath (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-953) Enable merge join in pig to work with loaders and store functions which can internally index sorted data
Date Fri, 16 Oct 2009 18:32:31 GMT

     [ https://issues.apache.org/jira/browse/PIG-953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pradeep Kamath updated PIG-953:
-------------------------------

    Attachment: PIG-953-6.patch

Dmitriy - by default when the application does not set an OutputCommitter, hadoop uses FileOutputCommitter.
So currently (in trunk code) since pig does not set an OuptuCommitter, hadoop would be using
FileOutputCommitter. Hence I derived from FileOutputCommitter so that the current cleanup
continues to happen and we do the extra commit needed by Zebra.

The new load-store redesign already has an allFinished() method in storeFunc which is the
same as this commit except it does not have the Configuration - I have modified it to have
the Configuration parameter.

It turns out zebra needs the job configuration in order to open the right side file during
merge join. Hence I am introducing an initialize(Configuration conf) method into the IndexableLoadFunc
interface in the attached patch so that the pig runtime can call it allowing zebra to store
this configuration for use in opening the right side file later.

> Enable merge join in pig to work with loaders and store functions which can internally
index sorted data 
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: PIG-953
>                 URL: https://issues.apache.org/jira/browse/PIG-953
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.3.0
>            Reporter: Pradeep Kamath
>            Assignee: Pradeep Kamath
>         Attachments: PIG-953-2.patch, PIG-953-3.patch, PIG-953-4.patch, PIG-953-5.patch,
PIG-953-6.patch, PIG-953.patch
>
>
> Currently merge join implementation in pig includes construction of an index on sorted
data and use of that index to seek into the "right input" to efficiently perform the join
operation. Some loaders (notably the zebra loader) internally implement an index on sorted
data and can perform this seek efficiently using their index. So the use of the index needs
to be abstracted in such a way that when the loader supports indexing, pig uses it (indirectly
through the loader) and does not construct an index. 

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