I experienced no problem today. Is this Java-specific?
No, it's a problem with futexes. If your production code doesn't use many (any) threads, you should be fine.
People are reporting the same issue with MySQLd, I had it with Firefox.
Out of control Java processes when dealing with a leap second?
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Re: Out of control Java processes when dealing with a leap second?
#32What's the explanation of that wacky date format? minute day hour month year . second
It's actually month day hour minute.second
Originally (and perhaps still) the month day is optional; allowing you to set the date with just hour and minute.
Re: Out of control Java processes when dealing with a leap second?
#33Leap second + Java + Linux fix (without reboot): /etc/init.d/ntp stop; date; date `date +"%m%d%H%M%C%y.%S"`; date; -- then restart java
Doesn't work for everyone (Didn't work with our java processes on RHEL 6.2)
Re: Out of control Java processes when dealing with a leap second?
#34I had a lovely morning (2am-4.30) rebooting about 50 boxes by hand. All wearing some shade of java.
Re: Out of control Java processes when dealing with a leap second?
#35At the risk of shooting myself, all our jvms were fine on windows and Ubuntu.
Re: Out of control Java processes when dealing with a leap second?
#36I was just wondering why everything stopped working at night. System.exit() didn't work anymore in any of the java processes, or just random hangs.
wow.
Re: Out of control Java processes when dealing with a leap second?
#37Thank you guys.. since yestartday night i was working on it.. searched lots of places.. some of servers were going down and some were working great.. never thought this would be the reason.
Re: Out of control Java processes when dealing with a leap second?
#38Even if you're not running java in your stack, it's worth a quick check on your servers. Our SoftLayer servers use an Adaptec RAID card and the monitoring software uses the JVM and will suck up all of your CPU. All of our MySQL/Cassandra/Redis/Kestrel servers needed to be bounced because they had RAID cards. Frustrating.
I also use Softlayer and have a pair of servers with Adaptec RAID cards. Checking up on them they were not affected.
Having looked in to it, it seems our server admin decided to install OpenNTP to replace the standard NTP daemon. I'm not sure why he did that, but it seems OpenNTP just ignores leap seconds and compensates after the fact just as if your clock had drifted a second out of sync in the usual way.
Re: Out of control Java processes when dealing with a leap second?
#39Leap second + Java + Linux fix (without reboot): /etc/init.d/ntp stop; date; date `date +"%m%d%H%M%C%y.%S"`; date; -- then restart java
A lot simpler: date --set "`date`"
On a localized box, I had to run "unset LANG" first, because otherwise date doesn't seem to understand its own output.
Re: Out of control Java processes when dealing with a leap second?
#40Same problem here. I am supposedly on vacation in Barcelona and was summoned to help :/ Gotta love your java.
Except that it's not a Java problem, it's a Linux futex problem.