this should help you: https://blogs.oracle.com/poonam/entry/understanding_cms_gc_logs
Best Regards, Sebastian Martinka Von: Michał Łowicki [mailto:mlowi...@gmail.com] Gesendet: Montag, 1. Juni 2015 11:47 An: user@cassandra.apache.org Betreff: How to interpret some GC logs Hi, Normally I get logs like: 2015-06-01T09:19:50.610+0000: 4736.314: [GC 6505591K->4895804K(8178944K), 0.0494560 secs] which is fine and understandable but occasionalIy I see something like: 2015-06-01T09:19:50.661+0000: 4736.365: [GC 4901600K(8178944K), 0.0049600 secs] How to interpret it? Does it miss only part before "->" so memory occupied before GC cycle? -- BR, Michał Łowicki