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From Jan <cne...@yahoo.com>
Subject Re: cassandra node jvm stall intermittently
Date Sat, 07 Mar 2015 07:35:16 GMT
HI Jason; 
The single node showing the anomaly is a hint that the problem is probably local to a node
(as you suspected).    
   - How many nodes do you have on the ring ?    

   - What is the activity when this occurs  - reads / writes/ compactions  ?      

   - Is there anything that is unique about this node that makes it different from the other
nodes ?    

   - Is this a periodic occurance OR a single occurence -   I am trying to determine a pattern
about when this shows up.    

   - What is the load distribution the ring (ie: is this node carrying more load than the
others).   


The system.log should have  more info.,    about it.       
hope this helpsJan/


 

     On Friday, March 6, 2015 4:50 AM, Jason Wee <peichieh@gmail.com> wrote:
   

 well, StatusLogger.java started shown in cassandra system.log, MessagingService.java also
shown some stage (e.g. read, mutation) dropped. 
It's strange it only happen in this node but this type of message does not shown in other
node log file at the same time... 
Jason
On Thu, Mar 5, 2015 at 4:26 AM, Jan <cnet62@yahoo.com> wrote:

HI Jason; 
Whats in the log files at the moment jstat shows 100%. What is the activity on the cluster
& the node at the specific point in time (reads/ writes/ joins etc)
Jan/ 

     On Wednesday, March 4, 2015 5:59 AM, Jason Wee <peichieh@gmail.com> wrote:
   

 Hi, our cassandra node using java 7 update 72 and we ran jstat on one of the node, and notice
some strange behaviour as indicated by output below. any idea why when eden space stay the
same for few seconds like 100% and 18.02% for few seconds? we suspect such "stalling" cause
timeout to our cluster.
any idea what happened, what went wrong and what could cause this?

$ jstat -gcutil 32276 1s
  0.00   5.78  91.21  70.94  60.07   2657   73.437     4    0.056   73.493  0.00
  5.78 100.00  70.94  60.07   2657   73.437     4    0.056   73.493  0.00   5.78
100.00  70.94  60.07   2657   73.437     4    0.056   73.493  0.00   5.78 100.00
 70.94  60.07   2657   73.437     4    0.056   73.493  0.00   5.78 100.00  70.94
 60.07   2657   73.437     4    0.056   73.493  0.00   5.78 100.00  70.94  60.07
  2657   73.437     4    0.056   73.493  0.00   5.78 100.00  70.94  60.07   2657
  73.437     4    0.056   73.493  0.00   5.78 100.00  70.94  60.07   2657   73.437
    4    0.056   73.493  0.00   5.78 100.00  70.94  60.07   2657   73.437    
4    0.056   73.493  0.00   5.78 100.00  70.94  60.07   2657   73.437     4  
 0.056   73.493  0.00   5.78 100.00  70.94  60.07   2657   73.437     4    0.056
  73.493  0.00   5.78 100.00  70.94  60.07   2657   73.437     4    0.056   73.493 
0.00   5.78 100.00  70.94  60.07   2657   73.437     4    0.056   73.493  0.00
  5.78 100.00  70.94  60.07   2657   73.437     4    0.056   73.493  0.00   5.78
100.00  70.94  60.07   2657   73.437     4    0.056   73.493  0.00   5.78 100.00
 70.94  60.07   2657   73.437     4    0.056   73.493  0.00   5.78 100.00  70.94
 60.07   2657   73.437     4    0.056   73.493  0.00   4.65  29.66  71.00  60.07
  2659   73.488     4    0.056   73.544  0.00   4.65  70.88  71.00  60.07   2659
  73.488     4    0.056   73.544  0.00   4.65  71.58  71.00  60.07   2659   73.488
    4    0.056   73.544  0.00   4.65  72.15  71.00  60.07   2659   73.488    
4    0.056   73.544  0.00   4.65  72.33  71.00  60.07   2659   73.488     4  
 0.056   73.544  0.00   4.65  72.73  71.00  60.07   2659   73.488     4    0.056
  73.544  0.00   4.65  73.20  71.00  60.07   2659   73.488     4    0.056   73.544 
0.00   4.65  73.71  71.00  60.07   2659   73.488     4    0.056   73.544  0.00
  4.65  73.84  71.00  60.07   2659   73.488     4    0.056   73.544  0.00   4.65
 73.91  71.00  60.07   2659   73.488     4    0.056   73.544  0.00   4.65  74.18
 71.00  60.07   2659   73.488     4    0.056   73.544  0.00   4.65  74.29  71.00
 60.07   2659   73.488     4    0.056   73.544  0.00   4.65  74.29  71.00  60.07
  2659   73.488     4    0.056   73.544  0.00   4.65  74.29  71.00  60.07   2659
  73.488     4    0.056   73.544  0.00   4.65  74.29  71.00  60.07   2659   73.488
    4    0.056   73.544  0.00   4.65  74.29  71.00  60.07   2659   73.488    
4    0.056   73.544  0.00   4.65  74.29  71.00  60.07   2659   73.488     4  
 0.056   73.544  0.00   4.65  74.29  71.00  60.07   2659   73.488     4    0.056
  73.544  0.00   5.43  12.64  71.09  60.07   2661   73.534     4    0.056   73.590 
0.00   5.43  18.02  71.09  60.07   2661   73.534     4    0.056   73.590  0.00
  5.43  18.02  71.09  60.07   2661   73.534     4    0.056   73.590  0.00   5.43
 18.02  71.09  60.07   2661   73.534     4    0.056   73.590  0.00   5.43  18.02
 71.09  60.07   2661   73.534     4    0.056   73.590  0.00   5.43  18.02  71.09
 60.07   2661   73.534     4    0.056   73.590  0.00   5.43  18.02  71.09  60.07
  2661   73.534     4    0.056   73.590  0.00   5.43  18.02  71.09  60.07   2661
  73.534     4    0.056   73.590  0.00   5.43  18.02  71.09  60.07   2661   73.534
    4    0.056   73.590  0.00   5.43  18.02  71.09  60.07   2661   73.534    
4    0.056   73.590  0.00   5.43  18.02  71.09  60.07   2661   73.534     4  
 0.056   73.590  0.00   5.43  18.02  71.09  60.07   2661   73.534     4    0.056
  73.590  0.00   5.43  18.02  71.09  60.07   2661   73.534     4    0.056   73.590 
0.00   5.43  18.02  71.09  60.07   2661   73.534     4    0.056   73.590  0.00
  5.43  18.02  71.09  60.07   2661   73.534     4    0.056   73.590  0.00   5.43
 18.02  71.09  60.07   2661   73.534     4    0.056   73.590  0.00   5.43  18.02
 71.09  60.07   2661   73.534     4    0.056   73.590  0.00   5.43  18.02  71.09
 60.07   2661   73.534     4    0.056   73.590  0.00   5.43  69.24  71.09  60.07
  2661   73.534     4    0.056   73.590  0.00   5.43  78.05  71.09  60.07   2661
  73.534     4    0.056   73.590  0.00   5.43  78.97  71.09  60.07   2661   73.534
    4    0.056   73.590  0.00   5.43  79.07  71.09  60.07   2661   73.534    
4    0.056   73.590  0.00   5.43  79.18  71.09  60.07   2661   73.534     4  
 0.056   73.590  0.00   5.43  80.09  71.09  60.07   2661   73.534     4    0.056
  73.590  0.00   5.43  80.36  71.09  60.07   2661   73.534     4    0.056   73.590 
0.00   5.43  80.51  71.09  60.07   2661   73.534     4    0.056   73.590  0.00
  5.43  80.70  71.09  60.07   2661   73.534     4    0.056   73.590  0.00   5.43
 81.31  71.09  60.07   2661   73.534     4    0.056   73.590  0.00   5.43  81.63
 71.09  60.07   2661   73.534     4    0.056   73.590  0.00   5.43  82.94  71.09
 60.07   2661   73.534     4    0.056   73.590  0.00   5.43  82.94  71.09  60.07
  2661   73.534     4    0.056   73.590  0.00   5.43  82.94  71.09  60.07   2661
  73.534     4    0.056   73.590  0.00   5.43  82.94  71.09  60.07   2661   73.534
    4    0.056   73.590  0.00   5.43  82.94  71.09  60.07   2661   73.534    
4    0.056   73.590  0.00   5.43  82.94  71.09  60.07   2661   73.534     4  
 0.056   73.590  0.00   5.43  82.94  71.09  60.07   2661   73.534     4    0.056
  73.590  0.00   9.37  65.64  71.21  60.07   2663   73.583     4    0.056   73.639 
0.00   3.49  11.89  71.25  60.10   2665   73.623     4    0.056   73.679  0.00
  3.49  66.11  71.25  60.10   2665   73.623     4    0.056   73.679 14.26   0.00
  9.91  71.25  60.10   2666   73.649     4    0.056   73.705 14.26   0.00  73.25
 71.25  60.10   2666   73.649     4    0.056   73.705  0.00  10.49  14.43  71.29
 60.10   2667   73.675     4    0.056   73.731  0.00  10.49  66.07  71.29  60.10
  2667   73.675     4    0.056   73.731  0.00  10.49 100.00  71.29  60.10   2667
  73.675     4    0.056   73.731  0.00  10.49 100.00  71.29  60.10   2667   73.675
    4    0.056   73.731  0.00  10.49 100.00  71.29  60.10   2667   73.675    
4    0.056   73.731  0.00  10.49 100.00  71.29  60.10   2667   73.675     4  
 0.056   73.731  0.00  10.49 100.00  71.29  60.10   2667   73.675     4    0.056
  73.731  0.00  10.49 100.00  71.29  60.10   2667   73.675     4    0.056   73.731 
0.00  10.49 100.00  71.29  60.10   2667   73.675     4    0.056   73.731  0.00
 10.49 100.00  71.29  60.10   2667   73.675     4    0.056   73.731  0.00  10.49
100.00  71.29  60.10   2667   73.675     4    0.056   73.731  0.00  10.49 100.00
 71.29  60.10   2667   73.675     4    0.056   73.731  0.00  10.49 100.00  71.29
 60.10   2667   73.675     4    0.056   73.731  0.00  10.49 100.00  71.29  60.10
  2667   73.675     4    0.056   73.731  0.00  10.49 100.00  71.29  60.10   2667
  73.675     4    0.056   73.731  0.00  10.49 100.00  71.29  60.10   2667   73.675
    4    0.056   73.731  0.00  10.49 100.00  71.29  60.10   2667   73.675    
4    0.056   73.731

thanks.
jason


    



   
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