Sagar Sadashiv Patwardhan created MESOS-7882:
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Summary: Mesos master rescinds all the in-flight offers from all
the registered agents when a new maintenance schedule is posted for a subset of
slaves
Key: MESOS-7882
URL: https://issues.apache.org/jira/browse/MESOS-7882
Project: Mesos
Issue Type: Bug
Components: master
Affects Versions: 1.3.0
Environment: Ubuntu 14:04(trusty)
Mesos master branch.
SHA: a31dd52ab71d2a529b55cd9111ec54acf7550ded
Reporter: Sagar Sadashiv Patwardhan
Priority: Minor
We are running mesos 1.1.0 in production. We use a custom autoscaler for
scaling our mesos cluster up and down. While scaling down the cluster,
autoscaler makes a POST request to mesos master /maintenance/schedule endpoint
with a set of slaves to move to maintenance mode. This forces mesos master to
rescind all the in-flight offers from *all the slaves* in the cluster. If our
scheduler accepts one of these offers, then we get a TASK_LOST status update
back for that task. We also see such
(https://gist.github.com/sagar8192/8858e7cb59a23e8e1762a27571824118) log lines
in mesos master logs.
After reading the code(refs:
https://github.com/apache/mesos/blob/master/src/master/master.cpp#L6772), it
appears that offers are getting rescinded for all the slaves. I am not sure
what is the expected behavior here, but it makes more sense if only resources
from slaves marked for maintenance are reclaimed.
Experiment:
To verify that it is actually happening, I checked out the master branch(sha:
a31dd52ab71d2a529b55cd9111ec54acf7550ded ) and added some log
lines(https://gist.github.com/sagar8192/42ca055720549c5ff3067b1e6c7c68b3).
Built the binary and started a mesos master and 2 agent processes. Used a basic
python framework that launches docker containers on these slaves. Verified that
there is no existing schedule for any slaves using `curl
10.40.19.239:5050/maintenance/status`. Posted maintenance schedule for one of
the slaves(https://gist.github.com/sagar8192/fb65170240dd32a53f27e6985c549df0)
after starting the mesos framework.
Logs:
mesos-master: https://gist.github.com/sagar8192/91888419fdf8284e33ebd58351131203
mesos-slave1: https://gist.github.com/sagar8192/3a83364b1f5ffc63902a80c728647f31
mesos-slave2: https://gist.github.com/sagar8192/1b341ef2271dde11d276974a27109426
Mesos framework:
https://gist.github.com/sagar8192/bcd4b37dba03bde0a942b5b972004e8a
I think mesos should rescind offers and inverse offers only for those slaves
that are marked for maintenance(draining mode).
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