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From Todd Lipcon <>
Subject Re: cassandra vs hbase summary (was facebook messaging)
Date Mon, 22 Nov 2010 20:05:44 GMT
On Mon, Nov 22, 2010 at 12:03 PM, Edward Capriolo <>wrote:

> What of reads that are not in the cache?
> Cassandra can use memory mapped io for its data and index files. Hbase
> has a very expensive read path for things that are not in cache. HDFS
> random read performance is historically poor.

Yep, you guys have an advantage there currently. We have some improvements
coming this year that will fix this (HDFS-347 and HDFS-941)


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