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Apache Dubbo Component
Java Samples (apache/dubbo-samples)
Dubbo Version
Samples：apache/dubbo-samples：dubbo-samples-zookeeper-provider Dubbo: 3.3.0/3.3.1 zookeeper server: 3.4.10;
Steps to reproduce this issue
从 dubbo2 升级到 dubbo3:如果您当前正在使用的 Zookeeper Server 版本是 3.4.x 版本，则使用以下 starter：
What you expected to happen
2025-04-24T00:22:34.751+08:00 ERROR 32324 --- [tor-Framework-0] o.a.c.f.i.CuratorFrameworkImpl : Background exception was not retry-able or retry gave up
org.apache.zookeeper.KeeperException$UnimplementedException: KeeperErrorCode = Unimplemented for /dubbo at org.apache.zookeeper.KeeperException.create(KeeperException.java:106) ~[zookeeper-3.7.2.jar:3.7.2] at org.apache.zookeeper.KeeperException.create(KeeperException.java:54) ~[zookeeper-3.7.2.jar:3.7.2] at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:1347) ~[zookeeper-3.7.2.jar:3.7.2] at org.apache.curator.utils.ZKPaths.mkdirs(ZKPaths.java:351) ~[curator-client-5.1.0.jar:?] at org.apache.curator.framework.imps.CreateBuilderImpl$8.performBackgroundOperation(CreateBuilderImpl.java:758) ~[curator-framework-5.1.0.jar:5.1.0] at org.apache.curator.framework.imps.OperationAndData.callPerformBackgroundOperation(OperationAndData.java:84) ~[curator-framework-5.1.0.jar:5.1.0] at org.apache.curator.framework.imps.CuratorFrameworkImpl.performBackgroundOperation(CuratorFrameworkImpl.java:974) ~[curator-framework-5.1.0.jar:5.1.0] at org.apache.curator.framework.imps.CuratorFrameworkImpl.backgroundOperationsLoop(CuratorFrameworkImpl.java:952) ~[curator-framework-5.1.0.jar:5.1.0] at org.apache.curator.framework.imps.CuratorFrameworkImpl.access$300(CuratorFrameworkImpl.java:66) ~[curator-framework-5.1.0.jar:5.1.0] at org.apache.curator.framework.imps.CuratorFrameworkImpl$4.call(CuratorFrameworkImpl.java:342) ~[curator-framework-5.1.0.jar:5.1.0] at java.base/java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:317) ~[?:?] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java) ~[?:?] at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304) ~[?:?] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?] at java.base/java.lang.Thread.run(Thread.java:1575) [?:?]
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Comment From: heliang666s
If you use zk upper than 3.4.x, it would be better to use dubbo-dependencies-zookeeper-curator5.@jockercheng91
Comment From: songxiaosheng
Attempt to align the versions of the Zookeeper client and server: https://curator.apache.org/docs/zk-compatibility-34
Comment From: wukaixian
ZooKeeper 3.4.x needs to be used with Curator 4.2.x. However, starting from Dubbo 3.3.x, Curator 4.2.x is no longer supported. Therefore, the conclusion is that Dubbo 3.3.x no longer supports ZooKeeper 3.4.x.
Dubbo 3.3.x only retains the Curator5ZookeeperClient
Comment From: wukaixian
Dubbo
If you want to use ZooKeeper 3.4.x, please use Dubbo 3.2.x.
Comment From: bert82503
ZooKeeper 3.4.x needs to be used with Curator 4.2.x. However, starting from Dubbo 3.3.x, Curator 4.2.x is no longer supported. Therefore, the conclusion is that Dubbo 3.3.x no longer supports ZooKeeper 3.4.x.
Dubbo 3.3.x only retains the
Curator5ZookeeperClient
Registration Center / Zookeeper https://cn.dubbo.apache.org/en/docs3-v2/java-sdk/reference-manual/registry/zookeeper/
Comment From: wukaixian
ZooKeeper 3.4.x needs to be used with Curator 4.2.x. However, starting from Dubbo 3.3.x, Curator 4.2.x is no longer supported. Therefore, the conclusion is that Dubbo 3.3.x no longer supports ZooKeeper 3.4.x. Dubbo 3.3.x only retains the
Curator5ZookeeperClientRegistration Center / Zookeeper https://cn.dubbo.apache.org/en/docs3-v2/java-sdk/reference-manual/registry/zookeeper/
The docs you provided is too old. It's no longer applicable, at least not in Dubbo 3.3.x. You can check the source code of the Zookeeper registry — support for Zookeeper 3.4.x has already been removed in version 3.3.x,and only Curator 5 is retained.