Size tiered or leveled compaction? From: Brian Tarbox <tar...@cabotresearch.com<mailto:tar...@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 Southfield Public School students safely access the tech tools they need on and off campus with the Barracuda Web Filter. Quick installation and easy to use- try the Barracuda Web Filter free for 30 days: http://on.fb.me/Vj6JBd
