Yong Qiao Wang created MESOS-4008:
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Summary: Master recovery with the persisted roles in registry
Key: MESOS-4008
URL: https://issues.apache.org/jira/browse/MESOS-4008
Project: Mesos
Issue Type: Task
Reporter: Yong Qiao Wang
Assignee: Yong Qiao Wang
To consider the Mesos master recovery and failover case, Mesos master needs to
persist the roles and weights information in registry:
In the first boot, the first leading master initialize the replicated log with
the roles/weights specified by command-line flags(--roles and --weights). The
flags values are only useful to bootstrap the cluster, after which point the
registry becomes the source of truth.
At runtime, the replicated log can only be updated to add/remove/update entries
by the operator REST API.
For Mesos master restart/failover case, if the replicated log for roles/weights
has exist, and then it prefers to use the registry values and ignore the flags
(--roles/--weights), and also log a warning in Mesos master that the flags
values are being ignored.
For the future works, we can educate end users to create the replicated log to
initialize the supported roles/weights before Mesos cluster bootstrap, and
reset roles/weights configurations by update the replicated log.
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