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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-3418) Improve quorum throughput through eager ACL checks of requests on local servers
Date Wed, 24 Jul 2019 02:36:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-3418?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16891540#comment-16891540

Hadoop QA commented on ZOOKEEPER-3418:

-1 overall.  GitHub Pull Request  Build

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 8 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 3.0.1) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    -1 core tests.  The patch failed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/4069//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/4069//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/4069//console

This message is automatically generated.

> 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
>          Time Spent: 2.5h
>  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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