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Jackson Chung commented on CASSANDRA-2845: ------------------------------------------ fwiw, i was able to avoid this (hang) if using just java (Sun's) instead of jsvc. (jna enabled on both, i do have to symlink it manually when start manually if install from deb package) Once i switch to jsvc, hell breaks kernel was on the older one on ec2: Linux domU-12-31-39-00-2C-42 2.6.38-8-virtual #42-Ubuntu SMP Mon Apr 11 04:06:34 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux Also able to had the same hang on a 2.6.35 on a rackspace couple days ago (killed the vm already..) dmesg shows timeout/OOM, crazy stuff :) on my own local,with separate install kernel Distributor ID: Ubuntu Description: Ubuntu 10.10 Release: 10.10 Codename: maverick Linux faranth 2.6.39-02063903-generic #201107091121 SMP Sat Jul 9 11:25:36 UTC 2011 x86_64 GNU/Linux I don't have the hang problem (using jsvc/jna/package) > 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