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Date: Wed, 22 Aug 2012 12:28:26 +0800
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Subject: Re: OutOfMemory log in Cassandra
From: Xu Renjie <xrjxrjxrjnet@gmail.com>
To: user@cassandra.apache.org
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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 <xrjxrjxrjnet@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.
>>
>>
>

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Guille,=A0<div>=A0 =A0Thanks for your reply. I seem to find where is the pr=
oblem. I guess it is because memory is used up not the jvm heap( I use micr=
o 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.<br>
<br><div class=3D"gmail_quote">On Wed, Aug 22, 2012 at 11:42 AM, Guillermo =
Winkler <span dir=3D"ltr">&lt;<a href=3D"mailto:gwinkler@inconcertcc.com" t=
arget=3D"_blank">gwinkler@inconcertcc.com</a>&gt;</span> wrote:<br><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc s=
olid;padding-left:1ex">
Xu, what&#39;s your configuration?<div><br></div><div>How many CF, how much=
 data (size/rows/cols), how many clients operations/sec and how much memory=
 assigned for the heap?</div><div><br></div><div>Guille</div><div class=3D"=
HOEnZb">
<div class=3D"h5"><div><br><br>

<div class=3D"gmail_quote">On Wed, Aug 22, 2012 at 12:09 AM, Xu Renjie <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:xrjxrjxrjnet@gmail.com" target=3D"_blan=
k">xrjxrjxrjnet@gmail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex">


Hi, all<div>=A0 =A0I have a problem about the log. I have set the CASSANDRA=
_HEAPDUMP_DIR in the <a href=3D"http://cassandra-env.in" target=3D"_blank">=
cassandra-env.in</a> file to some path to store the dump file</div><div>whe=
n OutOfMemory exception happens. But after out of memory happens(I judge it=
 from the /var/log/messages which says &quot;kernel: out of memory:</div>


<div>kill process XXXX), there is no dump file generated in that path. Is t=
his because kernel kill the jvm first so no OutOfMemory exception thrown or=
 what? I am new=A0to linux. Thanks in advance.</div><div><br></div>
</blockquote></div><br></div>
</div></div></blockquote></div><br></div>

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