Monitoring - Cassandra: The Definitive Guide - page 194

log4j.rootLogger= DEBUG ,stdout,R
NOTE
Of course, in production you'll want to tune the logging level back up to WARN or ERROR , as the verbose
output will slow things down considerably.
Now we can see a lot more activity as Cassandra does its work:
INFO 09:41:54,936 Completed flushing /var/lib/cassandra/data/system/
LocationInfo-8-Data.db
DEBUG 09:41:54,942 Checking to see if compaction of LocationInfo would be useful
DEBUG 09:41:54,942 discard completed log segments for CommitLogContext(file='/var/
lib/cassandra/commitlog/CommitLog-1277397714697.log',...
INFO 09:41:54,943 Compacting [org.apache.cassandra.io.SSTableReader(path='/var/
lib/cassandra
DEBUG 09:41:54,943 Marking replay position 121 on commit log CommitLogSegment(/var/
lib/cassandra/commitlog/CommitLog-1277397714697.log)...
DEBUG 09:41:54,943 index size for bloom filter calc for file
: /var/lib/cassandra/data/system/LocationInfo-5-Data.db : 256
DEBUG 09:41:54,944 index size for bloom filter calc for file
: /var/lib/cassandra/data/system/LocationInfo-6-Data.db : 512
DEBUG 09:41:54,944 index size for bloom filter calc for file
: /var/lib/cassandra/data/system/LocationInfo-7-Data.db : 768
INFO 09:41:54,985 Log replay complete
INFO 09:41:55,009 Saved Token found: 94408749511599155261361719888434486550
INFO 09:41:55,010 Saved ClusterName found: Test Cluster
INFO 09:41:55,016 Starting up server gossip
INFO 09:41:55,048 Binding thrift service to morpheus/192.168.1.5:9160
INFO 09:41:55,051 Cassandra starting up...
DEBUG 09:41:55,112 Marking /var/lib/cassandra/data/system/LocationInfo-5-Data.db
compacted
//...
DEBUG 09:41:55,117 Estimating compactions for Super1
DEBUG 09:41:55,117 Estimating compactions for Standard2
DEBUG 09:41:55,117 Estimating compactions for Super2
DEBUG 09:41:55,118 Estimating compactions for Standard1
DEBUG 09:41:55,118 Estimating compactions for StandardByUUID1
DEBUG 09:41:55,118 Estimating compactions for LocationInfo
DEBUG 09:41:55,118 Estimating compactions for HintsColumnFamily
DEBUG 09:41:55,118 Checking to see if compaction of Super1 would be useful
DEBUG 09:41:55,119 Checking to see if compaction of Standard2 would be useful
DEBUG 09:41:55,119 Checking to see if compaction of Super2 would be useful
//...
DEBUG 09:41:56,023 GC for ParNew: 1 ms, 14643776 reclaimed leaving 80756296 used;