Re: Cassandra take 100% CPU for 2~3 minutes every half an hour and mutation lost

2012-07-12 Thread Jason Tang
Hi After change the parameter of concurrent compactor, we can limit Cassandra to use 100% of one core at that moment. (concurrent_compactors: 1) And I got the stack of the crazy thread, it last 2~3 minutes, on same stack. Any clue of this issue? Thread 18114: (state = IN_JAVA) -

Cassandra take 100% CPU for 2~3 minutes every half an hour and mutation lost

2012-07-10 Thread Jason Tang
Hi I encounter the High CPU problem, Cassandra 1.0.3, happened on both sized and leveled compaction, 6G heap, 64bit Oracle java. For normal traffic, Cassandra will use 15% CPU. But every half a hour, Cassandra will use almost 100% total cpu (SUSE, 12 Core). And here is the top