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https://issues.apache.org/jira/browse/ZOOKEEPER-704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12873003#action_12873003
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Sergey Doroshenko commented on ZOOKEEPER-704:
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I have updated wiki page to describe new (quite simple and elegant) approach of
implementing server-side part of the read-only mode.
Already discussed this with Henry yesterday.
Take a look if you're interested in the details, and lmk if you have some
thoughts about this.
> GSoC 2010: Read-Only Mode
> -------------------------
>
> Key: ZOOKEEPER-704
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-704
> Project: Zookeeper
> Issue Type: Wish
> Reporter: Henry Robinson
>
> Read-only mode
> Possible Mentor
> Henry Robinson (henry at apache dot org)
> Requirements
> Java and TCP/IP networking
> Description
> When a ZooKeeper server loses contact with over half of the other servers in
> an ensemble ('loses a quorum'), it stops responding to client requests
> because it cannot guarantee that writes will get processed correctly. For
> some applications, it would be beneficial if a server still responded to read
> requests when the quorum is lost, but caused an error condition when a write
> request was attempted.
> This project would implement a 'read-only' mode for ZooKeeper servers (maybe
> only for Observers) that allowed read requests to be served as long as the
> client can contact a server.
> This is a great project for getting really hands-on with the internals of
> ZooKeeper - you must be comfortable with Java and networking otherwise you'll
> have a hard time coming up to speed.
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