Hi Jan, thanks for your time to prepare the question and answer below,
- How many nodes do you have on the ring ?
12
- What is the activity when this occurs - reads / writes/ compactions
?
This cluster has a lot of writes and read. off peak period, ops center
shown cluster write is about 5k/sec, read about 1k/sec and during peak
period, write could be 22k/sec and read about 10k/sec. So this particular
one node hang like every moment irrespect if it is peak or non peak, or
compaction.
- Is there anything that is unique about this node that makes it
different from the other nodes ?
Our nodes are same in term of operating system (centos 6) and cassandra
configuration settings. Other than that, there are no other resources
intensive application running in cassandra nodes.
- Is this a periodic occurance OR a single occurence - I am trying to
determine a pattern about when this shows up.
it *always* happened and in fact, it is happening now.
- What is the load distribution the ring (ie: is this node carrying more
load than the others).
As of this moment,
- Address DC Rack Status State Load
Owns Token
-
155962751505430129087380028406227096910
- <node1> us-east 1e Up Normal 498.66 GB
8.33% 0
- <node2> us-east 1e Up Normal 503.36 GB
8.33% 14178431955039102644307275309657008810
- <node3> us-east 1e Up Normal 492.08 GB
8.33% 28356863910078205288614550619314017619
- <node4> us-east 1e Up Normal 499.54 GB
8.33% 42535295865117307932921825928971026430
- <node5> us-east 1e Up Normal 523.76 GB
8.33% 56713727820156407428984779325531226109
- <node6> us-east 1e Up Normal 515.36 GB
8.33% 70892159775195513221536376548285044050
- <node7> us-east 1e Up Normal 588.93 GB
8.33% 85070591730234615865843651857942052860
- <node8> us-east 1e Up Normal 498.51 GB
8.33% 99249023685273718510150927167599061670
- <node9> us-east 1e Up Normal 531.81 GB
8.33% 113427455640312814857969558651062452221
- <node10> us-east 1e Up Normal 501.85 GB
8.33% 127605887595351923798765477786913079290
- <node11> us-east 1e Up Normal 501.13 GB
8.33% 141784319550391026443072753096570088100
- <node12> us-east 1e Up Normal 508.45 GB
8.33% 155962751505430129087380028406227096910
so that one node is node5. At this instance ring output, yea, it is
second highest in the ring but unlikely this is the cause.
Jason
On Sat, Mar 7, 2015 at 3:35 PM, Jan <cne...@yahoo.com> wrote:
> 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 helps
> Jan/
>
>
>
>
>
> On Friday, March 6, 2015 4:50 AM, Jason Wee <peich...@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 <cne...@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 <peich...@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
>
>
>
>
>
>
>
