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From "Wei-Chiu Chuang (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-16579) Upgrade to Apache Curator 4.2.0 in Hadoop
Date Wed, 09 Oct 2019 16:22:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-16579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16947820#comment-16947820
] 

Wei-Chiu Chuang commented on HADOOP-16579:
------------------------------------------

No. I only updated zookeeper version on top your patch. Tested on top of Hadoop trunk branch.

> Upgrade to Apache Curator 4.2.0 in Hadoop
> -----------------------------------------
>
>                 Key: HADOOP-16579
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16579
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Mate Szalay-Beko
>            Assignee: Norbert Kalmár
>            Priority: Major
>
> Currently in Hadoop we are using [ZooKeeper version 3.4.13|https://github.com/apache/hadoop/blob/7f9073132dcc9db157a6792635d2ed099f2ef0d2/hadoop-project/pom.xml#L90].
ZooKeeper 3.5.5 is the latest stable Apache ZooKeeper release. It contains many new features
(including SSL related improvements which can be very important for production use; see [the
release notes|https://zookeeper.apache.org/doc/r3.5.5/releasenotes.html]).
> Apache Curator is a high level ZooKeeper client library, that makes it easier to use
the low level ZooKeeper API. Currently [in Hadoop we are using Curator 2.13.0|https://github.com/apache/hadoop/blob/7f9073132dcc9db157a6792635d2ed099f2ef0d2/hadoop-project/pom.xml#L91]
and [in Ozone we use Curator 2.12.0|https://github.com/apache/hadoop/blob/7f9073132dcc9db157a6792635d2ed099f2ef0d2/pom.ozone.xml#L146].
> Curator 2.x is supporting only the ZooKeeper 3.4.x releases, while Curator 3.x is compatible
only with the new ZooKeeper 3.5.x releases. Fortunately, the latest Curator 4.x versions are
compatible with both ZooKeeper 3.4.x and 3.5.x. (see [the relevant Curator page|https://curator.apache.org/zk-compatibility.html]).
Many Apache projects have already migrated to Curator 4 (like HBase, Phoenix, Druid, etc.),
other components are doing it right now (e.g. Hive).
> *The aims of this task are* to:
>  - change Curator version in Hadoop to the latest stable 4.x version (currently 4.2.0)
>  - also make sure we don't have multiple ZooKeeper versions in the classpath to avoid
runtime problems (it is [recommended|https://curator.apache.org/zk-compatibility.html] to
exclude the ZooKeeper which come with Curator, so that there will be only a single ZooKeeper
version used runtime in Hadoop)
> In this ticket we still don't want to change the default ZooKeeper version in Hadoop,
we only want to make it possible for the community to be able to build / use Hadoop with the
new ZooKeeper (e.g. if they need to secure the ZooKeeper communication with SSL, what is only
supported in the new ZooKeeper version). Upgrading to Curator 4.x should keep Hadoop to be
compatible with both ZooKeeper 3.4 and 3.5.



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