There are a few Jenkins slaves I've seen this morning that have stopped
responding during jobs, causing IOExceptions and remote channel failure
messages.
I've taken a few of them offline so these should stop occurring. Jenkins
capacity will be much reduced until I can figure out why the hosts are
freezing.
Out of curiosity were these ever put back into use? Recently I have
felt like jobs have been taking a lot longer and jenkins has gotten
overloaded more frequently. It seemed to happen after this event.
-Justin
They were put back online with reduced slot counts (2 instead of 4)
which so far seems to have stopped them locking up. I intend to try 3
slots at some point this week.
–
Dominic Cleal
dominic@cleal.org
I'd like to propose adding the Jenkins Pipeline plugin as a way to help
reduce load through number of jobs [1]. If we were to take jobs that spawn
multiple jobs such as test_katello that does 4 different test sets each
spawning a separate job and use the Pipeline plugin this could be reduced
to a single job with multiple stages. These could either be parallelized to
keep the current view of all pieces that break or do a true serialized
pipeline with the fail fast jobs early to keep the test jobs as short as
possible and eating as few slots as possible.
[1] https://wiki.jenkins-ci.org/display/JENKINS/Pipeline+Plugin
On 29/08/16 17:13, Justin Sherrill wrote:
On 08/16/2016 06:56 AM, Dominic Cleal wrote:
There are a few Jenkins slaves I’ve seen this morning that have stopped
responding during jobs, causing IOExceptions and remote channel failure
messages.I’ve taken a few of them offline so these should stop occurring. Jenkins
capacity will be much reduced until I can figure out why the hosts are
freezing.Out of curiosity were these ever put back into use? Recently I have
felt like jobs have been taking a lot longer and jenkins has gotten
overloaded more frequently. It seemed to happen after this event.They were put back online with reduced slot counts (2 instead of 4)
which so far seems to have stopped them locking up. I intend to try 3
slots at some point this week.–
Dominic Cleal
dominic@cleal.org–
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–
Eric D. Helms
Red Hat Engineering
Ph.D. Student - North Carolina State University
The slave that I attempted this on crashed within a day, so they'll
remain on two slots each.
–
Dominic Cleal
dominic@cleal.org
I'll install the plugin at the next maintenance opportunity.
–
Dominic Cleal
dominic@cleal.org
Dominic,
Do you know why these crashes happen? Are there any monitoring graphs, that show cpu/memory usage over time? The issue sounds like a oom problem judging from what i read here. Do you see anything related in the system’s logs?
Timo
No, I don't know precisely and the slave that crashed yesterday doesn't
have the Rackspace monitoring agent installed to collect memory data.
slave09, one of those that crashed on the morning of 16/08, was showing
high memory and swap usage on 15/08
(http://paste.fedoraproject.org/418780/47271889/), so memory exhaustion
is quite likely. I don't have any data about what processes were using
the memory in this instance.
slave10, that crashed yesterday only logged hanging tasks
(https://paste.fedoraproject.org/418772/72718379/), which I've seen on
consoles and logs from other crashed systems. There's no ability to send
a sysrq through the provided console, and nothing like kdump/watchdogs
are configured on those systems.
–
Dominic Cleal
dominic@cleal.org
The plugin is installed now.
–
Dominic Cleal
dominic@cleal.org