Michael Han created ZOOKEEPER-3418:
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Summary: 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
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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