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From "Johan Oskarsson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1050) Too many splits for ColumnFamily with only a few rows
Date Tue, 25 May 2010 13:23:28 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12871138#action_12871138
] 

Johan Oskarsson commented on CASSANDRA-1050:
--------------------------------------------

I usually do, but my default thrift installation is 0.2.0 (used in all my other projects)
and this required a newer version.

> Too many splits for ColumnFamily with only a few rows
> -----------------------------------------------------
>
>                 Key: CASSANDRA-1050
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1050
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Hadoop
>    Affects Versions: 0.6
>            Reporter: Joost Ouwerkerk
>            Assignee: Johan Oskarsson
>             Fix For: 0.7
>
>         Attachments: CASSANDRA-0.6-1050.patch, CASSANDRA-1050.patch
>
>
> ColumnFamilyInputFormat creates splits for the entire Keyspace.  If one ColumnFamily
has 100 Million rows and another has only 100 rows, the number of splits will be the 1,526
(assuming 64k rows per split) for either one, since it is based on the total number of unique
keys across the whole keyspace, and not on the number of rows in the ColumnFamily.

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