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
