[JIRA] [core] (JENKINS-24155) Jenkins Slaves Go Offline In Large Quantities and Don't Reconnect Until Reboot

[oldel...@java.net (JIRA)]

Richard Mortimer commented on JENKINS-24155 Jenkins Slaves Go Offline In Large Quantities and Don't Reconnect Until Reboot One potential workaround to try is adding -Djenkins.slaves.NioChannelSelector.disabled=true onto the Jenkins master's launcher command line arguments. On Debian/Ubuntu that is as simple as adding the above to JAVA_ARGS in /etc/default/jenkins If launching jenkins from the commandline it would be java -Djenkins.slaves.NioChannelSelector.disabled=true -jar jenkins.war I just tested this on my system and it does seem to change the behaviour when I run my test case. In 3 tests the slave continued working correctly on 3 occassions. 2 of these saw the queued traffic just delivered and things continued as before. In the other example the original TCP connection entered TIME_WAIT state and a new connection was started successfully by the recently suspended slave. Wed Aug 20 11:18:23 BST 2014 tcp6 0 0 :::42715 :::* LISTEN tcp6 0 0 192.168.1.23:42715 192.168.1.115:50570 TIME_WAIT tcp6 0 0 192.168.1.23:42715 192.168.1.24:47835 ESTABLISHED tcp6 0 0 192.168.1.23:42715 192.168.1.115:50619 ESTABLISHED From this I suspect that the new NIO based method of communicating with slaves is not causing the full TCP socket to get closed until TCP timers timeout. Whereas in the thread-per-slave method the connection is tore down almost immediately. It would be good to know if the NioChannelSelector workaround outlined above helps others.

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