Cassandra occupy over 80% CPU when take a compaction

2012-07-16 Thread
Hello, I find the compaction of my secondary index takes a long time and occupy a lot of CPU. INFO [CompactionExecutor:8] 2012-07-16 12:03:16,408 CompactionTask.java (line 213) Compacted to [XXX]. 71,018,346 to 9,020 (~0% of original) bytes for 3 keys at 0.22MB/s. Time: 397,602ms. The sta

Cassandra consistency issue on cluster system

2012-06-28 Thread
*Background*: My application is running on a cluster system(which have 4 nodes), and system time of these four nodes are synchronizing by NTP. I use Write.QUORUM and Read.QUORUM strategy. The probability of this problem is not very high. Cassandra version is 1.0.3, I have tried Cassandra 1.1.1, thi