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https://issues.apache.org/jira/browse/ZOOKEEPER-2384?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Yu resolved ZOOKEEPER-2384.
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Resolution: Later
> Support atomic increment / decrement of znode value
> ---------------------------------------------------
>
> Key: ZOOKEEPER-2384
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2384
> Project: ZooKeeper
> Issue Type: Improvement
> Reporter: Ted Yu
> Labels: atomic
>
> Use case is to store reference count (integer type) in znode.
> It is desirable to provide support for atomic increment / decrement of the
> znode value.
> Suggestion from Flavio:
> {quote}
> you can read the znode, keep the version of the znode, update the value,
> write back conditionally. The condition for the setData operation to succeed
> is that the version is the same that it read
> {quote}
> While the above is feasible, developer has to implement retry logic
> him/herself. It is not easy to combine increment / decrement with other
> operations using multi.
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