Benjamin Mahler created MESOS-660:
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Summary: Better slave recovery semantics when flags are changed.
Key: MESOS-660
URL: https://issues.apache.org/jira/browse/MESOS-660
Project: Mesos
Issue Type: Improvement
Reporter: Benjamin Mahler
Assignee: Vinod Kone
Fix For: 0.15.0
Ideally we can have one of the following semantics apply for all of the slave
flags:
1. Safety: If the flag is modified and this will have an strange or unintended
behavior, do not proceed.
2. "Do The Right Thing": If flags are modified and the slave can take action to
ensure the expected behavior occurs. Many of the isolator related flags can
DTRT.
We currently have neither of these properties covered for all flags. For
example:
-Any of the slave flags that affect SlaveInfo will have "Safe" semantics. The
slave will not proceed with recovery as the master has cached the SlaveInfo.
-Adding --cgroups_cfs_enabled will DTRT (apply cfs_quota_us to existing
executors). But removing it will not DTRT (will leave cfs_quota_us untouched if
it is already applied)!
It's not clear what level of support we want to provide for flag changes, but
at the very least we need Safety, otherwise things will behave strangely.
Assigning this to Vinod as a placeholder for now.
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