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From Henrik Schröder <skro...@gmail.com>
Subject Testing compaction strategies on a single production server?
Date Tue, 19 Feb 2013 13:56:52 GMT
Hey,

Version 1.1 of Cassandra introduced live traffic sampling, which allows you
to measure the performance of a node without it really joining the cluster:
http://www.datastax.com/dev/blog/whats-new-in-cassandra-1-1-live-traffic-sampling

That page mentions that you can change the compaction strategy through jmx
if you want to test out a different strategy on your survey node.

That's great, but it doesn't give you a complete view of how your
performance would change, since you're not doing reads from the survey
node. But what would happen if you used jmx to change the compaction
strategy of a column family on a single *production* node? Would that be a
safe way to test it out or are there side-effects of doing that live?

And if you do that, would running a major compaction transform the entire
column family to the new format?

Finally, if the test was a success, how do you proceed from there? Just
change the schema?


/Henrik

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