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From "Jeremy Hanna (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-1050) Too many splits for ColumnFamily with only a few rows
Date Fri, 21 May 2010 14:32:20 GMT


Jeremy Hanna commented on CASSANDRA-1050:

I wonder if this would address the problem in CASSANDRA-1042.  I'll give it a try and see.

> Too many splits for ColumnFamily with only a few rows
> -----------------------------------------------------
>                 Key: CASSANDRA-1050
>                 URL:
>             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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