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From "Benjamin Reed (JIRA)" <j...@apache.org>
Subject [jira] Commented: (ZOOKEEPER-107) Allow dynamic changes to server cluster membership
Date Tue, 07 Jul 2009 19:04:15 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728300#action_12728300

Benjamin Reed commented on ZOOKEEPER-107:

sorry to jump in late here. rather than adding the inform, why don't we just send the PROPOSE
and COMMIT to the Observer as normal, and just make the Observer not send ACKs? That way we
change as little code as possible with minimum overhead. It also makes switching from Observer
to Follower as easy as turning on the ACKs. I also think Observers should be able to issue
proposals. One use case for observers are remote data centers that basically proxy clients
that connect to ZooKeeper. This means an Observer is just a Follower that doesn't vote (ACK).

> Allow dynamic changes to server cluster membership
> --------------------------------------------------
>                 Key: ZOOKEEPER-107
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-107
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: server
>            Reporter: Patrick Hunt
>            Assignee: Henry Robinson
>         Attachments: SimpleAddition.rtf
> Currently cluster membership is statically defined, adding/removing hosts to/from the
server cluster dynamically needs to be supported.

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