Upgrade from 2.0.3. There are several bugs, On Wednesday, February 19, 2014, Yogi Nerella <ynerella...@gmail.com> wrote: > You should start your Cassandra daemon with -verbose:gc (please check syntax) and then run it in foreground, as Cassandra closes the standard out) > Please see other emails in this forum for getting Garbage Collection Statistics from Cassandra user mail, or look at any Java specific sites. > Ex: http://stackoverflow.com/questions/1161647/how-to-redirect-verbose-garbage-collection-output-to-a-file > > > It depends on what JVM you are running. > > > On Wed, Feb 19, 2014 at 9:12 AM, Sourabh Agrawal <iitr.sour...@gmail.com> wrote: >> >> How do I get that statistic? >> >> On Wed, Feb 19, 2014 at 10:34 PM, Yogi Nerella <ynerella...@gmail.com> wrote: >>> >>> Could be your -Xmn800M is too low, that is why it is trying garbage collecting very frequently. >>> Do you have any statistics on how much memory it is collecting on every cycle? >>> >>> >>> On Wed, Feb 19, 2014 at 8:47 AM, Sourabh Agrawal <iitr.sour...@gmail.com> wrote: >>>> >>>> Below is CPU usage from top. I don't see any steal. Idle time is pretty low. >>>> Cpu(s): 83.3%us, 14.5%sy, 0.0%ni, 0.5%id, 0.0%wa, 0.0%hi, 1.7%si, 0.0%st >>>> >>>> Any other pointers? >>>> >>>> On Wed, Feb 19, 2014 at 8:34 PM, Nate McCall <n...@thelastpickle.com> wrote: >>>>> >>>>> You may be seeing steal from another tenant on the VM. This article has a good explanation: >>>>> http://blog.scoutapp.com/articles/2013/07/25/understanding-cpu-steal-time-when-should-you-be-worried >>>>> >>>>> In short, kill the instance and launch a new one. Depending on your latency requirements and operational ability to respond, you may want to consider paying for dedicated instances. >>>>> >>>>> On Wed, Feb 19, 2014 at 2:30 AM, Sourabh Agrawal < iitr.sour...@gmail.com> wrote: >>>>>> >>>>>> Hi, >>>>>> I am running cassandra 2.0.3 cluster on 4 AWS nodes. memory arguments are the following for each node : >>>>>> -Xms8G -Xmx8G -Xmn800M >>>>>> >>>>>> I am experiencing consistent high loads on one of the nodes. Each node is getting approximately equal number of writes. I tried to have a look at the logs and seems like CMS GC is running every 1-2 seconds. >>>>>> Any pointers on how to debug this? >>>>>> -- >>>>>> Sourabh Agrawal >>>>>> Bangalore >>>>>> +91 9945657973 >>>>> >>>>> >>>>> -- >>>>> ----------------- >>>>> Nate McCall >>>>> Austin, TX >>>>> @zznate >>>>> >>>>> Co-Founder & Sr. Technical Consultant >>>>> Apache Cassandra Consulting >>>>> http://www.thelastpickle.com >>>> >>>> >>>> -- >>>> Sourabh Agrawal >>>> Bangalore >>>> +91 9945657973 >> >> >> >> -- >> Sourabh Agrawal >> Bangalore >> +91 9945657973 >
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