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https://issues.apache.org/jira/browse/ZOOKEEPER-1508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13412258#comment-13412258
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Patrick Hunt commented on ZOOKEEPER-1508:
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Sounds like an option people might want to have and would be nice to include in
the std distribution. When you say it diverges I'm assuming your concern is
more at the code level than the functional? What would be the impact, would we
be able to implement in a backward compatible way?
> Reliable standalone mode through redundant databases
> ----------------------------------------------------
>
> Key: ZOOKEEPER-1508
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1508
> Project: ZooKeeper
> Issue Type: New Feature
> Environment: Single server with multiple disks or two node cluster
> with multiple shared disks
> Reporter: Bill Bridge
>
> Currently ZooKeeper requires 3 servers to provide both reliability and
> availability. This is fine for large internet scale clusters, but there are
> lots of two node clusters that could benefit from ZooKeeper. There are also
> single server use cases where it is highly desirable to have ZooKeeper
> survive a disk failure, but availability is not as important.
> This feature would allow the configuration of multiple destinations for logs
> and snapshots. A transaction is committed when a majority of the log writes
> complete successfully. If one log gets an error on write, then it is taken
> offline until an administrator brings it online or replaces it with a new
> destination. ZooKeeper continues to run as long as a quorum of disks can be
> written.
> High availability can be provided with a two node cluster. When the ZooKeeper
> node dies, the disks are switched to the surviving node and a new ZooKeeper
> starts. Faster switch over can be done if there is an observer already
> running in the new node.
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