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https://issues.apache.org/jira/browse/ZOOKEEPER-1355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13243211#comment-13243211
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Flavio Junqueira commented on ZOOKEEPER-1355:
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I'm reviewing this one.
> Add zk.updateServerList(newServerList)
> ---------------------------------------
>
> Key: ZOOKEEPER-1355
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1355
> Project: ZooKeeper
> Issue Type: New Feature
> Components: java client
> Reporter: Alexander Shraer
> Assignee: Alexander Shraer
> Fix For: 3.5.0
>
> Attachments: ZOOKEEPER-1355-ver10-1.patch,
> ZOOKEEPER-1355-ver10-2.patch, ZOOKEEPER-1355-ver10-3.patch,
> ZOOKEEPER-1355-ver10-4.patch, ZOOKEEPER-1355-ver10-4.patch,
> ZOOKEEPER-1355-ver10.patch, ZOOKEEPER-1355-ver11-1.patch,
> ZOOKEEPER-1355-ver11.patch, ZOOKEEPER-1355-ver2.patch,
> ZOOKEEPER-1355-ver4.patch, ZOOKEEPER-1355-ver5.patch,
> ZOOKEEPER-1355-ver6.patch, ZOOKEEPER-1355-ver7.patch,
> ZOOKEEPER-1355-ver8.patch, ZOOKEEPER-1355-ver9-1.patch,
> ZOOKEEPER-1355-ver9.patch, ZOOKEEPER=1355-ver3.patch,
> ZOOOKEEPER-1355-test.patch, ZOOOKEEPER-1355-ver1.patch,
> ZOOOKEEPER-1355.patch, loadbalancing-more-details.pdf, loadbalancing.pdf
>
>
> When the set of servers changes, we would like to update the server list
> stored by clients without restarting the clients.
> Moreover, assuming that the number of clients per server is the same (in
> expectation) in the old configuration (as guaranteed by the current list
> shuffling for example), we would like to re-balance client connections across
> the new set of servers in a way that a) the number of clients per server is
> the same for all servers (in expectation) and b) there is no
> excessive/unnecessary client migration.
> It is simple to achieve (a) without (b) - just re-shuffle the new list of
> servers at every client. But this would create unnecessary migration, which
> we'd like to avoid.
> We propose a simple probabilistic migration scheme that achieves (a) and (b)
> - each client locally decides whether and where to migrate when the list of
> servers changes. The attached document describes the scheme and shows an
> evaluation of it in Zookeeper. We also implemented re-balancing through a
> consistent-hashing scheme and show a comparison. We derived the probabilistic
> migration rules from a simple formula that we can also provide, if someone's
> interested in the proof.
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