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From Mikhail Mazursky <ash...@gmail.com>
Subject Re: C* consumes all RAM
Date Wed, 17 Apr 2013 04:19:44 GMT
Thank you, Aaron.

p.s. we're on 1.1.9 - i forgot to mention that.


2013/4/17 aaron morton <aaron@thelastpickle.com>

> You are probably seeing this http://wiki.apache.org/cassandra/FAQ#mmap
>
> Cheers
>
>    -----------------
> Aaron Morton
> Freelance Cassandra Consultant
> New Zealand
>
> @aaronmorton
> http://www.thelastpickle.com
>
> On 16/04/2013, at 8:43 PM, Mikhail Mazursky <ash2kk@gmail.com> wrote:
>
> More details:
>
> USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
> 219       3801  0.7 92.7 6561116 3567016 ?     SLl  Mar11 372:44
> /usr/java/latest/bin/java
>
> Linux XXX@YYY 3.2.30-49.59.amzn1.x86_64 #1 SMP Wed Oct 3 19:54:33 UTC
> 2012 x86_64 x86_64 x86_64 GNU/Linux
>
> total       used       free     shared    buffers     cached
> Mem:          3754       3695         59          0         37         75
> -/+ buffers/cache:       3582        171
> Swap:         2055        165       1890
>
>
>
> 2013/4/16 Mikhail Mazursky <ash2kk@gmail.com>
>
>> Hello.
>>
>> C* have been running without any problem for some weeks but now it
>> started to consume all available ram.
>>
>> The cluster have very little data in it. There are no errors in logs, CPU
>> is not loaded at all, jstack shows no deadlocks, there are 83 threads.
>> Read/write latency is 1-4ms.
>>
>> The question is: how to find out where is the RAM used?
>>
>> # nodetool ring keyspace name
>> Address         DC          Rack        Status State   Load
>> Effective-Ownership Token
>>
>> 114967934986393518082067045023985443411
>> 10.0.1.220      datacenter1 rack1       Up     Normal  889.71 KB
>> 100.00%             0
>> 10.0.1.222      datacenter1 rack1       Up     Normal  918.92 KB
>> 100.00%             56662868904138943096229641828625627278
>> 10.0.1.221      datacenter1 rack1       Up     Normal  1.04 MB
>> 100.00%             114967934986393518082067045023985443411
>>
>> We use AWS m1.medium - 3.75 RAM, 1 Core
>>
>> java version "1.7.0_10"
>> Java(TM) SE Runtime Environment (build 1.7.0_10-b18)
>> Java HotSpot(TM) 64-Bit Server VM (build 23.6-b04, mixed mode)
>>
>> C* is started with the following command
>> /usr/java/latest/bin/java -ea
>> -javaagent:/usr/share/cassandra/lib/jamm-0.2.5.jar -XX:+UseThreadPriorities
>> -XX:ThreadPriorityPolicy=42 -Xms1G -Xmx1G -Xmn512M
>> -XX:+HeapDumpOnOutOfMemoryError -Xss256k -XX:+UseParNewGC
>>
>> Thanks in advance.
>>
>> Mikhail.
>>
>
>
>

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