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https://issues.apache.org/jira/browse/CASSANDRA-1050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12870658#action_12870658
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Jonathan Ellis commented on CASSANDRA-1050:
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+1
> 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
> Fix For: 0.6.2
>
> Attachments: 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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