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From "Jeff Hammerbacher (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (PIG-823) Hadoop Metadata Service
Date Fri, 29 May 2009 18:48:45 GMT

    [ https://issues.apache.org/jira/browse/PIG-823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714547#action_12714547
] 

Jeff Hammerbacher edited comment on PIG-823 at 5/29/09 11:48 AM:
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It's an open source project and easily extensible. There are many extensions to the service
within Facebook to support more general information. Why not try to add the desired "lower
level" metadata to the existing service as a patch to Hive, since it's already got pluggable
backends and a server implementation already defined? Also, could you better define what "close
to HDFS" means? There's a lot of HDFS metadata stored in the NameNode. Also, the initial implementation
of the metadata repository for Hive stored data in HDFS, but it was found to be quite useful
to have a separate service for metadata. Perhaps you could learn from their experiences?

      was (Author: hammer):
    It's an open source project and easily extensible. There are many extensions to the service
within Facebook to support more general information. Why not try to add them to the existing
service, since it's already got pluggable backends and a server implementation already defined?
  
> Hadoop Metadata Service
> -----------------------
>
>                 Key: PIG-823
>                 URL: https://issues.apache.org/jira/browse/PIG-823
>             Project: Pig
>          Issue Type: New Feature
>            Reporter: Olga Natkovich
>
> This JIRA is created to track development of a metadata system for  Hadoop. The goal
of the system is to allow users and applications to register data stored on HDFS, search for
the data available on HDFS, and associate metadata such as schema, statistics, etc. with a
particular data unit or a data set stored on HDFS. The initial goal is to provide a fairly
generic, low level abstraction that any user or application on HDFS can use to store an retrieve
metadata. Over time a higher level abstractions closely tied to particular applications or
tools can be developed.
> Over time, it would make sense for the metadata service to become a subproject within
Hadoop. For now, the proposal is to make it a contrib to Pig since Pig SQL is likely to be
the first user of the system.

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