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From Edward Capriolo <edlinuxg...@gmail.com>
Subject Re: word of caution to those switching to LCS from SizeTieredStrategy
Date Tue, 12 Mar 2013 21:29:26 GMT
yes LCS has its own compacting thing. It does not honor min compaction, max
compaction, and no-ops major compaction. The issue is that at the moment
you change your system moves all your sized data to L0 and then starts a
huge compaction grid to level it.

It would be great to just make this change to one server and see
read/write.

Check out the write sampling mode.

Edward

On Tue, Mar 12, 2013 at 9:08 AM, Hiller, Dean <Dean.Hiller@nrel.gov> wrote:

> We tested it in QA, but in production it brought our cluster to a halt
> even though we setcompactionthroughput to 1, we were severely limited.
>  Nodetool stop compaction did not seem to have any impact either.  We ended
> up increasing memory on one node to help alleviate some issue(cranked it up
> to 16G and we hope to put it back down to 8 G later).
>
> Just be careful if you are trying to make the switch.  Also, I added this
> jira ticket which would be extremely nice to turn on LCS for a CF/node and
> do a node by node switch…
>
> https://issues.apache.org/jira/browse/CASSANDRA-5335
>
>
> Dean
>

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