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From Jonathan Ellis <>
Subject Re: Performance Characteristics of CASSANDRA-16 (Memory Efficient Compactions)
Date Sat, 05 Jun 2010 14:30:38 GMT
#16 is very simple: it allows you to make very large rows.  That is all.

Other things being equal, doing reads from really big rows will be
slower (since the row index will take longer to read) and this patch
does not change this.

On Fri, Jun 4, 2010 at 5:47 PM, Jeremy Davis
<> wrote:
> Can someone (Jonathan?)  help me understand the performance characteristics
> of this patch?
> Specifically: If I have an open ended CF, and I keep inserting with ever
> increasing column names (for example current Time), will things generally
> work out ok performance wise? Or will I pay some ever increasing penalty
> with the number of entries?
> My assumption is that you have bucketed things up for me by column name
> order, and as long as I don't delete/modify/create a column in one of the
> old buckets, then things will work out ok. Or is this not at all what is
> going on?
> Thanks,
> -JD

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support

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