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From "paul cannon (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-2845) Cassandra uses 100% system CPU on Ubuntu Natty (11.04)
Date Tue, 19 Jul 2011 18:54:58 GMT


paul cannon commented on CASSANDRA-2845:

To clarify my earlier comment about different EC2 kernel images: I thought those were the
actual linux kernel images I was getting, but they were actually just different pv-grub builds.
They were all still chaining to the kernel from inside the Ubuntu image.

> Cassandra uses 100% system CPU on Ubuntu Natty (11.04)
> ------------------------------------------------------
>                 Key: CASSANDRA-2845
>                 URL:
>             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
08x main)
> Step 3. apt-get install cassandra, as soon as it cassandra starts it will freeze the
> 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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