[
https://issues.apache.org/jira/browse/ZOOKEEPER-2819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16063970#comment-16063970
]
Michael Han commented on ZOOKEEPER-2819:
----------------------------------------
bq. the cluster is partitioned and an admin may want to force a minority of
servers to form a cluster
Yeah, I think being able to deal with the partitioned / none quorum forming
case is important from an operational point of view. Actually I think this is
the main reason we should continue supporting rolling restart while advocating
dynamic reconfig as the main approach to do reconfig.
bq. One idea of how this can be achieved is by setting reconfigEnable parameter
to false
Created ZOOKEEPER-2820 to document this.
> Changing membership configuration via rolling restart does not work on 3.5.x.
> -----------------------------------------------------------------------------
>
> Key: ZOOKEEPER-2819
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2819
> Project: ZooKeeper
> Issue Type: Bug
> Components: quorum, server
> Affects Versions: 3.5.0, 3.5.1, 3.5.2, 3.5.3
> Reporter: Michael Han
> Assignee: Michael Han
> Priority: Critical
>
> In 3.5.x there is no easy way of changing the membership config using rolling
> restarts because of the introduction of dynamic reconfig feature in
> ZOOKEEPER-107, which automatically manages membership configuration
> parameters.
> ZOOKEEPER-2014 introduced a reconfigEnabled flag to turn on / off the
> reconfig feature. We can use same flag and when it sets to false, it should
> disable both in memory and on disk updates of membership configuration
> information, besides disabling the reconfig commands on CLI which
> ZOOKEEPER-2014 already did, so users can continue using rolling restarts if
> needed.
> We should also document explicitly the support of membership changes via
> rolling restarts will be deprecated at what release time frame and promote
> reconfig as the replacement.
> The problem was raised at user mailing list by Guillermo Vega-Toro, reference
> thread:
> http://zookeeper-user.578899.n2.nabble.com/How-to-add-nodes-to-a-Zookeeper-3-5-3-beta-ensemble-with-reconfigEnabled-false-td7583138.html
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
