james strachan commented on ZOOKEEPER-78:

Great catch Benjamin! I've a working patch using your algorithm; am using 
x-sessionId-sequenceNumber and its working a treat (though its a tad hard to 
force ZK to fail mid-create :). 

Am working on some unit tests to try out the server stopping/starting which 
I'll attach shortly once they're working a bit better...

> added a high level protocol/feature - for easy Leader Election or exclusive 
> Write Lock creation
> -----------------------------------------------------------------------------------------------
>                 Key: ZOOKEEPER-78
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-78
>             Project: Zookeeper
>          Issue Type: New Feature
>          Components: java client
>    Affects Versions: 3.0.0
>            Reporter: james strachan
>            Assignee: james strachan
>         Attachments: writeLock_protocol_version3.patch
> Here's a patch which adds a little WriteLock helper class for performing 
> leader elections or creating exclusive locks in some directory znode. Note 
> its an early cut; am sure we can improve it over time. The aim is to avoid 
> folks having to use the low level ZK stuff but provide a simpler high level 
> abstraction.

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