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.

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