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From Michael Kjellman <mkjell...@barracuda.com>
Subject Re: help turning compaction..hours of run to get 0% compaction....
Date Mon, 07 Jan 2013 20:13:30 GMT
Size tiered or leveled compaction?

From: Brian Tarbox <tarbox@cabotresearch.com<mailto:tarbox@cabotresearch.com>>
Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
Date: Monday, January 7, 2013 12:03 PM
To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
Subject: help turning compaction..hours of run to get 0% compaction....

I have a column family where I'm doing 500 inserts/sec for 12 hours or so at time.  At some
point my performance falls off a cliff due to time spent doing compactions.

I'm seeing row after row of logs saying that after 1 or 2 hours of compactiing it reduced
to 100% of 99% of the original.

I'm trying to understand what direction this data points me to in term of configuration change.

   a) increase my compaction_throughput_mb_per_sec because I'm falling behind (am I falling
behind?)

   b) enable multi-threaded compaction?

Any help is appreciated.

Brian

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