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From Sourabh Agrawal <iitr.sour...@gmail.com>
Subject Re: High CPU load on one node in the cluster
Date Wed, 19 Feb 2014 17:12:31 GMT
How do I get that statistic?


On Wed, Feb 19, 2014 at 10:34 PM, Yogi Nerella <ynerella999@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.sourabh@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 <nate@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.sourabh@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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