[jira] Updated: (ZOOKEEPER-704) GSoC 2010: Read-Only Mode

["Henry Robinson (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Henry Robinson updated ZOOKEEPER-704:
-------------------------------------

    Summary: GSoC 2010: Read-Only Mode  (was: Read-Only Mode)

> 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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