Szalay-Beko Mate created YARN-9783:
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Summary: 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: Szalay-Beko Mate
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 fails only because of a single YARN test case:
`TestSecureRegistry.testLowlevelZKSaslLogin()`. 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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