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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 updated ZOOKEEPER-2384:
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Description:
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.
was:
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:
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
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.
> 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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