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https://issues.apache.org/jira/browse/YARN-9783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16919084#comment-16919084
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Akira Ajisaka commented on YARN-9783:
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Thanks [~symat] for the contribution and thanks [~adam.antal] for the review.
> Remove low-level zookeeper test to be able to build Hadoop against zookeeper
> 3.5.5
> ----------------------------------------------------------------------------------
>
> Key: YARN-9783
> URL: https://issues.apache.org/jira/browse/YARN-9783
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: Mate Szalay-Beko
> Assignee: Mate Szalay-Beko
> Priority: Major
> Fix For: 3.3.0
>
> Attachments: YARN-9783.001.patch, YARN-9783.002.patch,
> YARN-9783.003.patch
>
>
> ZooKeeper 3.5.5 release is the latest stable one. It contains many new
> features (including SSL related improvements which are very important for
> production use; see [the release
> notes|https://zookeeper.apache.org/doc/r3.5.5/releasenotes.html]). Yet there
> should be no backward incompatible changes on the API, so the applications
> using ZooKeeper clients should be built against the new zookeeper without any
> problem and the new ZooKeeper client should work with the older (3.4) servers
> without any issue, at least until someone is start to use new functionality.
> The aim of this ticket is not to change the ZooKeeper version used by Hadoop
> YARN yet, but to enable people to rebuild and test Hadoop with the new
> ZooKeeper version.
> Currently the Hadoop build (with ZooKeeper 3.5.5) fails because of a YARN
> test case:
> [TestSecureRegistry.testLowlevelZKSaslLogin()|https://github.com/apache/hadoop/blob/a0da1ec01051108b77f86799dd5e97563b2a3962/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/test/java/org/apache/hadoop/registry/secure/TestSecureRegistry.java#L64].
> This test case seems to use low-level ZooKeeper internal code, which changed
> in the new ZooKeeper version. Although I am not sure what was the original
> reasoning of the inclusion of this test in the YARN code, I propose to remove
> it, and if there is still any missing test case in ZooKeeper, then let's
> issue a ZooKeeper ticket to test this scenario there.
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