[
https://issues.apache.org/jira/browse/MESOS-903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13878244#comment-13878244
]
Vinod Kone commented on MESOS-903:
----------------------------------
https://reviews.apache.org/r/17171/
https://reviews.apache.org/r/17172/
https://reviews.apache.org/r/17173/
I propose we include the first 2 reviews in 0.16.0 and the last one in 0.17.0
to make backwards compatible upgrade easier. Thoughts?
There will be another patch that adds "hostname" field to MasterInfo.
> Store MasterInfo in ZK to enable master web UI redirection etc.
> ---------------------------------------------------------------
>
> Key: MESOS-903
> URL: https://issues.apache.org/jira/browse/MESOS-903
> Project: Mesos
> Issue Type: Improvement
> Reporter: Yan Xu
> Assignee: Vinod Kone
> Fix For: 0.17.0
>
>
> Storing a ProtoBuf MasterInfo in ZK allows us to add more fields other than
> the PID to associate with the (leading) master so that other entities (e.g.
> the follower masters) get more information such as the public hostname.
> The current solution that BenH and I have worked out:
> ## Introduce Group::Membership::label for backwards compatibility.
> - Group: use the sequence number for membership `id` and `label_` for storing
> additional data. This way a ProtoBuf blob is never stored at the same path as
> a regular PID so that the backwards compatibility issue (parsing a PID string
> as ProtoBuf blob or vise versa) can be avoided.
> - Group::Membership will include a label field. Group::join() writes
> `label_sequence` as ZNode name: `info_sequence` stores MasterInfo and plain
> `sequence` stores PID.
> ## Current version (v0: 0.16)
> - Group operation ignores ZNodes whose names can't be parse into `int32`. So
> that when a slave is rolled back and reads from ZK which has v1 data, it
> ignores all the masters and stays idle.
> ## New version (v1: >= 0.17)
> - Roll slaves first. New slaves can work with old ZK data.
> - Master can be rolled back after slave roll.
> See more: https://gist.github.com/xujyan/796d2e10b8fbddaf7979
--
This message was sent by Atlassian JIRA
(v6.1.5#6160)
