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From "Jeremy Hanna (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (CASSANDRA-1047) Get hadoop ColumnFamily metadata from describe_keyspace instead of config file
Date Fri, 11 Jun 2010 15:58:17 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12877839#action_12877839
] 

Jeremy Hanna edited comment on CASSANDRA-1047 at 6/11/10 11:57 AM:
-------------------------------------------------------------------

No, sorry, it's just that with the word_count, there is a java program that needs to be written
for the map reduce anyway, so I could put the configuration information into the config helper
for that case.

For the pig stuff, all that's needed is the CassandraStorage file - which is probably going
to move into core.  Other than that it's just relying on libraries and you get to run pig
scripts or the pig shell - no other java programming needed.  So for that, it's either that
we need to use the configuration file for cassandra that's already there - based on the static
initialization of the vars in DatabaseDescriptor, or we have to create a mechanism to configure
it.

Does that make more sense?

      was (Author: jeromatron):
    No, sorry, it's just that with the word_count, there is a java program that needs to be
written for the map reduce anyway, so I could put the configuration information into the config
helper for that case.

For the pig stuff, all that's needed is the CassandraStorage file - which is probably going
to move into core.  Other than that it's just relying on libraries and you get to run pig
scripts or the pig shell - no other java programming needed.  So for that, it's either that
we need to use the configuration file for cassandra that's already there - based on the static
initialization of the vars in DatabaseDescriptor, or we have to create a mechanism to use
configure it.

Does that make more sense?
  
> Get hadoop ColumnFamily metadata from describe_keyspace instead of config file
> ------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-1047
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1047
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Hadoop
>            Reporter: Jonathan Ellis
>            Assignee: Jeremy Hanna
>             Fix For: 0.7
>
>         Attachments: add-reconciler-data-patch.txt
>
>
> Requiring the Hadoop job to contain a copy of the Cassandra configuration file is clunky
and error-prone.  Instead, the Hadoop job should get an IP and port to contact for the range
map and for CF metadata (with describe_keyspace).

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