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https://issues.apache.org/jira/browse/ZOOKEEPER-1355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13246175#comment-13246175
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Flavio Junqueira commented on ZOOKEEPER-1355:
---------------------------------------------
There are currently two separate reviews on the review board for this jira, one
by Alex and one by Marshall. It would be great if we could keep one review
request and update it with new revisions. And, just so that the comments from
review board are recorded in the jira, please make sure to update the bugs
field with the jira number.
I have also already reviewed the java part of this patch, but I don't see any
of my previous comments reflected.
Could you guys please fix all these?
> 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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