Thank you for the mail. Same here, but I restarted the affected server
before I noticed your mail.
It affected both OpenJDK Java 6 (packaged with Ubuntu 10.04) and Oracle
Java 7 processes. Ubuntu 32 bit servers had no issues, only a 64 bit
machine.
Likely it is related to the leap second introduced today.
On 2012.07.01. 5:11, Mina Naguib wrote:
Hi folks
Our cassandra (and other java-based apps) started experiencing extremely high
CPU usage as of 8pm eastern time (midnight UTC).
The issue appears to be related to specific versions of java + linux + ntpd
There are many solutions floating around on IRC, twitter, stackexchange, LKML.
The simplest one that worked for us is simply to run this command on each
affected machine:
date; date `date +"%m%d%H%M%C%y.%S"`; date;
CPU drop was instantaneous - there was no need to restart the server, ntpd, or
any of the affected JVMs.
