Raúl Gracia Tinedo created CURATOR-519:
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Summary: Curator 4.0.x/4.1.x release using Zookeeper 3.5.5
Key: CURATOR-519
URL: https://issues.apache.org/jira/browse/CURATOR-519
Project: Apache Curator
Issue Type: Wish
Components: General
Affects Versions: 4.1.0, 4.0.1
Reporter: Raúl Gracia Tinedo
We are using Curator 4.0.1 in our project (Pravega,
[https://github.com/pravega/pravega]).
Just for context, we are intensively deploying Pravega on Kubernetes. In this
sense, Zookeeper (3.5.4-beta) is also being deployed as a service in
Kubernetes. In this environment, Zookeeper instances (i.e., pods) can be
frequently restarted or relocated and their IP may change. Properly handling
this situation requires to re-resolve the IP for hostname of Zookeeper
instances.
In fact, we are experiencing problems with this exact issue with Curator 4.0.1
(i.e., re-resolution of Zookeeper hostnames), which internally uses Zookeeper
3.5.3-beta as a dependency. Details can be found in this GitHub issue:
[https://github.com/pravega/pravega/issues/3651
]
Fortunately, the proper resolution of Zookeepr hostnames has been actually
reported and fixed in the Zookeeper project:
- Issue: https://issues.apache.org/jira/browse/ZOOKEEPER-2184
- Commit on Zookeeper 3.5.5 branch:
[https://github.com/apache/zookeeper/commit/1e65b9f4873fc995308972433ea8a664e98fe41f]
To verify that it helps us to solve our problem, I have built a custom Curator
4.0.1 library using Zookeeper 3.5.5 and then I used that library to build a
Pravega image. A couple of comments to take into account:
- Using Zookeeper 3.5.5 to build Curator 4.0.1 required no code change, just
changing the Zookeeper dependency version in the pom.xml (I had the same
experience with Curator 4.1.0).
- I verified that using Curator 4.0.1 and 4.1.0 with Zookeeper 3.5.5 solves the
re-resolution of Zookeeper hostnames, which makes our system able to properly
handle Zookeeper instance restarts.
Therefore, the main point of this issue is: _is in the roadmap to release
Curator 4.0.x and/or 4.1.x using Zookeeper 3.5.5?_ (Note that Zookeeper 3.5.5
is about to get released: [https://github.com/apache/zookeeper/releases])
Thanks in advance,
Raúl.
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