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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-833) Storage access layer
Date Wed, 29 Jul 2009 03:00:14 GMT

     [ https://issues.apache.org/jira/browse/PIG-833?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Raghu Angadi updated PIG-833:
-----------------------------

    Attachment: PIG-833-zebra.patch

The first cut of contrib/zebra. The patch is very large and should probably compress the subsequent
versions of it.

More documentation on design and usage will be added to the jira.

How to compile :
----------------------
 * check out latest PIG trunk
 * Apply the latest patch from PIG-660
 * copy attached hadoop20.jar to ./lib
 * run '{{ant jar}}' (and {{'ant -Dtestcase=none test-core'}} for zebra tests).
 * cd contrib/zebra
 * ant jar
 * ant test (for tests).

Currently there are compile time deprecation warnings related to use of deprecated mapred
API (JobConf). There is will be fixed later.


> Storage access layer
> --------------------
>
>                 Key: PIG-833
>                 URL: https://issues.apache.org/jira/browse/PIG-833
>             Project: Pig
>          Issue Type: New Feature
>            Reporter: Jay Tang
>         Attachments: hadoop20.jar.bz2, PIG-833-zebra.patch
>
>
> A layer is needed to provide a high level data access abstraction and a tabular view
of data in Hadoop, and could free Pig users from implementing their own data storage/retrieval
code.  This layer should also include a columnar storage format in order to provide fast data
projection, CPU/space-efficient data serialization, and a schema language to manage physical
storage metadata.  Eventually it could also support predicate pushdown for further performance
improvement.  Initially, this layer could be a contrib project in Pig and become a hadoop
subproject later on.

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