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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-704) Cluster-wide mutex (ZooKeeper integration)
Date Mon, 18 Jan 2010 16:28:54 GMT


Jonathan Ellis commented on CASSANDRA-704:

Who is calling CM.lock()?  If it's intended to be exposed to thrift I don't see that here,
but I don't see any other uses either.

Is there a compelling reason to put this in core instead of contrib/?

> Cluster-wide mutex (ZooKeeper integration)
> ------------------------------------------
>                 Key: CASSANDRA-704
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Jaakko Laine
>            Assignee: Jaakko Laine
>         Attachments: 704-cluster-mutex.patch, zookeeper-3.2.2.jar
> Provide a cluster-wide mutex (zookeeper integration). Not strictly needed at the moment,
but since it's done now, I'll post it here for community to review & decide if it should
be included. This would allow us to have atomic increment/decrement operations before vector
clocks, and might come handy in automatic load balancing and other future tasks.

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