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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1050) Too many splits for ColumnFamily with only a few rows
Date Tue, 25 May 2010 12:33:24 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12871113#action_12871113
] 

Jonathan Ellis commented on CASSANDRA-1050:
-------------------------------------------

btw, if you build the thrift code with "ant gen-thrift-java" it will re-run rat for you to
avoid blowing away the apache license headers in the generated code

> 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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