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From "Raghu S (JIRA)" <j...@apache.org>
Subject [jira] Commented: (ZOOKEEPER-107) Allow dynamic changes to server cluster membership
Date Mon, 04 May 2009 23:26:30 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12705822#action_12705822
] 

Raghu S commented on ZOOKEEPER-107:
-----------------------------------

Using a URL for obtaining a list of servers may not be acceptable in all environments. The
URL will have to highly available otherwise the clients won't connect after a restart. It
applies to ZK peers as well, a peer won't be able to restart if the URL is down at the time
of peer restart. So I believe (1) is a better choice here -- the cluster needs to be self-contained.

IIUC, using a ZK node to expose the cluster config would mean that the cluster can't be created
unless the cluster config is pre-populated? We need to first create a log file that contains
a config node that has the initial cluster members, copy them to all the nodes and power them
on to create the cluster? Once the cluster is formed, new nodes can be admitted to the cluster
by having a quorum commit the new server name in the cluster config. 

Another alternative would be to have a single node come up first (with the log file pre-populated
to contain a single server in the cluster config node) and then have all other servers join
one at a time? This sounds a bit weird to me in that the first node will have to form a single
node cluster in the beginning, which is an oxymoron :)



> 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
>
> Currently cluster membership is statically defined, adding/removing hosts to/from the
server cluster dynamically needs to be supported.

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