Hi,
We have a cluster with 48 nodes configured with RACK,sometimes it's hang for even 2 minutes.the response time jump from 300ms to 15s. Could anyone please advise how to identified the root cause ? The following is from the system log INFO [Service Thread] 2017-10-26 21:45:46,796 GCInspector.java:258 - G1 Young Generation GC in 222ms. G1 Eden Space: 939524096 -> 0; G1 Old Gen: 6652738584 -> 6662878232; G1 Survivor Space: 134217728 -> 109051904; INFO [Service Thread] 2017-10-26 21:45:46,796 StatusLogger.java:51 - Pool Name Active Pending Completed Blocked All Time Blocked INFO [Service Thread] 2017-10-26 21:45:46,796 StatusLogger.java:66 - MutationStage 0 3 3612475121 0 0 INFO [Service Thread] 2017-10-26 21:45:46,796 StatusLogger.java:66 - RequestResponseStage 0 0 6333593550 0 0 INFO [Service Thread] 2017-10-26 21:45:46,796 StatusLogger.java:66 - ReadRepairStage 0 0 2773154 0 0 INFO [Service Thread] 2017-10-26 21:45:46,796 StatusLogger.java:66 - CounterMutationStage 0 0 0 0 0 INFO [Service Thread] 2017-10-26 21:45:46,796 StatusLogger.java:66 - ReadStage 0 4 417419357 0 0 Thanks.