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From aaron morton <>
Subject Re: about the compaction and read performance
Date Mon, 20 Feb 2012 00:36:16 GMT
If you run a manual compaction with nodetool each CF will  be compacted to a single SSTable.

Not that this is not normally recommended as it means that automatic compaction will take
a long time to get to the file. 

Take a look at nodetool cfhistograms to get an idea of how spread out your data is. 

Aaron Morton
Freelance Developer

On 17/02/2012, at 8:14 PM, zhangcheng wrote:

> Cassandra has no way of knowing that all the data is in the most recent sstable, and
will have to check the others too, and this bring a lot of difficulty to data compaction.
> I have a question that if  I want a high performance data compaction, how can I implement
that all the columns are all in the most recent sstable, by this, I think the read and write
performace will be better.
> Thanks.
> 2012-02-17
> zhangcheng

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