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Posted to user@cassandra.apache.org by Xu Renjie <xr...@gmail.com> on 2012/08/22 05:09:51 UTC
OutOfMemory log in Cassandra
Hi, all
I have a problem about the log. I have set the CASSANDRA_HEAPDUMP_DIR in
the cassandra-env.in file to some path to store the dump file
when OutOfMemory exception happens. But after out of memory happens(I judge
it from the /var/log/messages which says "kernel: out of memory:
kill process XXXX), there is no dump file generated in that path. Is this
because kernel kill the jvm first so no OutOfMemory exception thrown or
what? I am new to linux. Thanks in advance.
Re: OutOfMemory log in Cassandra
Posted by Xu Renjie <xr...@gmail.com>.
BTW, I have checked the jvm by jps that the options are correctly added.
On Wed, Aug 22, 2012 at 11:09 AM, Xu Renjie <xr...@gmail.com> wrote:
> Hi, all
> I have a problem about the log. I have set the CASSANDRA_HEAPDUMP_DIR
> in the cassandra-env.in file to some path to store the dump file
> when OutOfMemory exception happens. But after out of memory happens(I
> judge it from the /var/log/messages which says "kernel: out of memory:
> kill process XXXX), there is no dump file generated in that path. Is this
> because kernel kill the jvm first so no OutOfMemory exception thrown or
> what? I am new to linux. Thanks in advance.
>
>
Re: OutOfMemory log in Cassandra
Posted by aaron morton <aa...@thelastpickle.com>.
> CASSANDRA_HEAPDUMP_DIR
Is for JVM out of memory. You were seeing the OS kill the JVM because of low os memory.
Cheers
-----------------
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 22/08/2012, at 4:28 PM, Xu Renjie <xr...@gmail.com> wrote:
> Guille,
> Thanks for your reply. I seem to find where is the problem. I guess it is because memory is used up not the jvm heap( I use micro ec2 instance just for toy use). Seems that I have set the cassandra heap too high to avoid gc to effect my performance, but the total memory is not enough. So I have set a smaller cache value for my application. Currently, it works well.
>
> On Wed, Aug 22, 2012 at 11:42 AM, Guillermo Winkler <gw...@inconcertcc.com> wrote:
> Xu, what's your configuration?
>
> How many CF, how much data (size/rows/cols), how many clients operations/sec and how much memory assigned for the heap?
>
> Guille
>
>
> On Wed, Aug 22, 2012 at 12:09 AM, Xu Renjie <xr...@gmail.com> wrote:
> Hi, all
> I have a problem about the log. I have set the CASSANDRA_HEAPDUMP_DIR in the cassandra-env.in file to some path to store the dump file
> when OutOfMemory exception happens. But after out of memory happens(I judge it from the /var/log/messages which says "kernel: out of memory:
> kill process XXXX), there is no dump file generated in that path. Is this because kernel kill the jvm first so no OutOfMemory exception thrown or what? I am new to linux. Thanks in advance.
>
>
>
Re: OutOfMemory log in Cassandra
Posted by Xu Renjie <xr...@gmail.com>.
Guille,
Thanks for your reply. I seem to find where is the problem. I guess it
is because memory is used up not the jvm heap( I use micro ec2 instance
just for toy use). Seems that I have set the cassandra heap too high to
avoid gc to effect my performance, but the total memory is not enough. So I
have set a smaller cache value for my application. Currently, it works well.
On Wed, Aug 22, 2012 at 11:42 AM, Guillermo Winkler <
gwinkler@inconcertcc.com> wrote:
> Xu, what's your configuration?
>
> How many CF, how much data (size/rows/cols), how many clients
> operations/sec and how much memory assigned for the heap?
>
> Guille
>
>
> On Wed, Aug 22, 2012 at 12:09 AM, Xu Renjie <xr...@gmail.com>wrote:
>
>> Hi, all
>> I have a problem about the log. I have set the CASSANDRA_HEAPDUMP_DIR
>> in the cassandra-env.in file to some path to store the dump file
>> when OutOfMemory exception happens. But after out of memory happens(I
>> judge it from the /var/log/messages which says "kernel: out of memory:
>> kill process XXXX), there is no dump file generated in that path. Is this
>> because kernel kill the jvm first so no OutOfMemory exception thrown or
>> what? I am new to linux. Thanks in advance.
>>
>>
>
Re: OutOfMemory log in Cassandra
Posted by Guillermo Winkler <gw...@inconcertcc.com>.
Xu, what's your configuration?
How many CF, how much data (size/rows/cols), how many clients
operations/sec and how much memory assigned for the heap?
Guille
On Wed, Aug 22, 2012 at 12:09 AM, Xu Renjie <xr...@gmail.com> wrote:
> Hi, all
> I have a problem about the log. I have set the CASSANDRA_HEAPDUMP_DIR
> in the cassandra-env.in file to some path to store the dump file
> when OutOfMemory exception happens. But after out of memory happens(I
> judge it from the /var/log/messages which says "kernel: out of memory:
> kill process XXXX), there is no dump file generated in that path. Is this
> because kernel kill the jvm first so no OutOfMemory exception thrown or
> what? I am new to linux. Thanks in advance.
>
>