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From: Brian Burruss <bburruss@real.com>
To: 
  "cassandra-user@incubator.apache.org" <cassandra-user@incubator.apache.org>
Date: Wed, 16 Dec 2009 15:39:12 -0800
Subject: RE: OOM Exception
Thread-Topic: OOM Exception
Thread-Index: Acp+p9DQlq4i1KIMRAe4wHzqmQZCJgAASfPc
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is this what you want?  they are big - i'd rather not spam everyone with th=
em.  if you need them or the hprof files i can tar them and send them to yo=
u.

thx!


[bburruss@gen-app02 cassandra]$ ls -l ~/cassandra/btoddb/commitlog/
total 597228
-rw-rw-r-- 1 bburruss bburruss 134219796 Dec 16 13:52 CommitLog-12609958951=
23.log
-rw-rw-r-- 1 bburruss bburruss 134218547 Dec 16 13:52 CommitLog-12609978113=
17.log
-rw-rw-r-- 1 bburruss bburruss 134218331 Dec 16 13:52 CommitLog-12609984977=
44.log
-rw-rw-r-- 1 bburruss bburruss 134219677 Dec 16 13:53 CommitLog-12610003305=
87.log
-rw-rw-r-- 1 bburruss bburruss  74055680 Dec 16 14:49 CommitLog-12610004390=
79.log
[bburruss@gen-app02 cassandra]$=20

________________________________________
From: Jonathan Ellis [jbellis@gmail.com]
Sent: Wednesday, December 16, 2009 3:29 PM
To: cassandra-user@incubator.apache.org
Subject: Re: OOM Exception

How large are the log files being replayed?

Can you attach the log from a replay attempt?

On Wed, Dec 16, 2009 at 5:21 PM, Brian Burruss <bburruss@real.com> wrote:
> sorry, thought i included everything ;)
>
> however, i am using beta2
>
> ________________________________________
> From: Jonathan Ellis [jbellis@gmail.com]
> Sent: Wednesday, December 16, 2009 3:18 PM
> To: cassandra-user@incubator.apache.org
> Subject: Re: OOM Exception
>
> What version are you using?  0.5 beta2 fixes the
> using-more-memory-on-startup problem.
>
> On Wed, Dec 16, 2009 at 5:16 PM, Brian Burruss <bburruss@real.com> wrote:
>> i'll put my question first:
>>
>> - how can i determine how much RAM is required by cassandra?  (for norma=
l operation and restarting server)
>>
>> *** i've attached my storage-conf.xml
>>
>> i've gotten several more OOM exceptions since i mentioned it a week or s=
o ago.  i started from a fresh database a couple days ago and have been add=
ing 2k blocks of data keyed off a random integer at the rate of about 400/s=
ec.  i have a 2 node cluster, RF=3D2, Consistency for read/write is ONE.  t=
here are ~70,420,082 2k blocks of data in the database.
>>
>> i used the default memory setup of Xmx1G when i started a couple days ag=
o.  as the database grew to ~180G (reported by unix du command) both server=
s OOM'ed at about the same time, within 10 minutes of each other.  well nee=
dless to say, my cluster is dead.  so i upped the memory to 3G and the serv=
ers tried to come back up, but one died again with OOM.
>>
>> Before cleaning the disk and starting over a couple days ago, i played t=
he game of "jack up the RAM", but eventually i didn't want to up it anymore=
 when i got to 5G.  the parameter, SSTable.INDEX_INTERVAL, was discussed a =
few days ago that would change the number of "keys" cached in memory, so i =
could modify that at the cost of read performance, but doing the math, 3G s=
hould be plenty of room.
>>
>> it seems like startup requires more RAM than just normal running.
>>
>> so this of course concerns me.
>>
>> i have the hprof files from when the server initially crashed and when i=
t crashed trying to restart if anyone wants them
>>
>