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https://issues.apache.org/jira/browse/ZOOKEEPER-3418?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Enrico Olivelli resolved ZOOKEEPER-3418.
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Resolution: Fixed
Fix Version/s: 3.6.0
Issue resolved by pull request 971
[https://github.com/apache/zookeeper/pull/971]
> Improve quorum throughput through eager ACL checks of requests on local
> servers
> -------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-3418
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3418
> Project: ZooKeeper
> Issue Type: Improvement
> Components: server
> Affects Versions: 3.6.0
> Reporter: Michael Han
> Assignee: Michael Han
> Priority: Major
> Labels: Twitter, pull-request-available
> Fix For: 3.6.0
>
> Time Spent: 3.5h
> Remaining Estimate: 0h
>
> Serving write requests that change the state of the system requires quorum
> operations, and in some cases, the quorum operations can be avoided if the
> requests are doomed to fail. ACL check failure is such a case. To optimize
> for this case, we elevate the ACL check logic and perform eager ACL check on
> local server (where the requests are received), and fail fast, before sending
> the requests to leader.
> As with any features, there is a feature flag that can control this feature
> on, or off (default). This feature is also forward compatible in that for new
> any new Op code (and some existing Op code we did not explicit check
> against), they will pass the check and (potentially) fail on leader side,
> instead of being prematurely filtered out on local server.
> The end result is better throughput and stability of the quorum for certain
> workloads.
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