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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 -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira