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From Benno Evers <bev...@mesosphere.com>
Subject Agent reconfiguration without losing tasks
Date Wed, 06 Dec 2017 16:42:55 GMT
Hi everyone,

as a follow-up to the earlier discussions, I'm happy to announce that we
just landed a patch series that adds the
`--reconfiguration_policy=[equal|additive]` flag to the Mesos agent, which
allows an agent to change parts of its configured state while still
reconnecting to live, running executors and keeping its old agent id.

# What changes are allowed?

For now, we opted to keep the set of allowed configuration changes somewhat
restricted, mainly because we felt that in particular changing the hostname
has some nasty corner-cases that we didn't have the time yet to fully think
about. This means that right now, you can only

  - add additional attributes,
  - increase static resources, or
  - add a fault domain.

However, if you are compiling Mesos yourself and think you could benefit
from relaxing these requirements, I would encourage you to apply
https://reviews.apache.org/r/64384/ and share the feedback about any issues
it causes (or doesn't cause).

Best regards,
-- 
Benno Evers
Software Engineer, Mesosphere

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