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From "paul cannon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2845) Cassandra uses 100% system CPU on Ubuntu Natty (11.04)
Date Tue, 19 Jul 2011 18:52:58 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13067887#comment-13067887
] 

paul cannon commented on CASSANDRA-2845:
----------------------------------------

It seems worth just a tiny bit of extra testing if we can identify the problem a little better,
because the potential benefit from JNA is so large, and Ubuntu is, by and large, a very handy
platform to use with ec2 (not least because of the UEC AMIs).

I've found now that upgrading the kernel to 2.6.38-10 (in my case, the package linux-image-2.6.38-10-virtual)
seems to make the problem go away completely. Steve, can you see if that helps you as well?
If so, we can close this and just recommend avoiding Ubuntu 2.6.38-8 kernel builds.

> Cassandra uses 100% system CPU on Ubuntu Natty (11.04)
> ------------------------------------------------------
>
>                 Key: CASSANDRA-2845
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2845
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.8.0
>         Environment: Default install of Ubuntu 11.04
>            Reporter: Steve Corona
>            Assignee: paul cannon
>            Priority: Critical
>             Fix For: 0.8.2
>
>
> Step 1. Boot up a brand new, default Ubuntu 11.04 Server install
> Step 2. Install Cassandra from Apache APT Respository (deb http://www.apache.org/dist/cassandra/debian
08x main)
> Step 3. apt-get install cassandra, as soon as it cassandra starts it will freeze the
machine
> What's happening is that as soon as cassandra starts up it immediately sucks up 100%
of CPU and starves the machine. This effectively bricks the box until you boot into single
user mode and disable the cassandra init.d script.
> Under htop, the CPU usage shows up as "system" cpu, not user.
> The machine I'm testing this on is a Quad-Core Sandy Bridge w/ 16GB of Memory, so it's
not a system resource issue. I've also tested this on completely different hardware (Dual
64-Bit Xeons & AMD X4) and it has the same effect.
> Ubuntu 10.10 does not exhibit the same issue. I have only tested 0.8 and 0.8.1.
> root@cassandra01:/# java -version
> java version "1.6.0_22"
> OpenJDK Runtime Environment (IcedTea6 1.10.2) (6b22-1.10.2-0ubuntu1~11.04.1)
> OpenJDK 64-Bit Server VM (build 20.0-b11, mixed mode)
> root@cassandra:/# uname -a
> Linux cassandra01 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 x86_64
x86_64 x86_64 GNU/Linux
> /proc/cpu
> Intel(R) Xeon(R) CPU E31270 @ 3.40GHz
> /proc/meminfo
> MemTotal:       16459776 kB
> MemFree:        14190708 kB

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