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https://issues.apache.org/jira/browse/ZOOKEEPER-5063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18093081#comment-18093081
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Li Wang edited comment on ZOOKEEPER-5063 at 7/1/26 10:38 PM:
-------------------------------------------------------------
Proposed solution:
Modify `Observer.findLearnerMaster()` to call `recreateSocketAddresses()` on
the selected observer master before returning it:
```java
QuorumServer findLearnerMaster() {
// ... existing code ...
finalQuorumPeer.QuorumServermaster= (prescribedLearnerMaster == null)
?self.findLearnerMaster(findLeader())
: prescribedLearnerMaster;
// Add this line to ensure fresh DNS resolution
if (master != null) {
master.recreateSocketAddresses();
}
currentLearnerMaster = master;
// ... rest of existing code ...
}
```
was (Author: liwang):
Proposed solution:
Modify `Observer.findLearnerMaster()` to call `recreateSocketAddresses()` on
the selected observer master before returning it:
```java
QuorumServer findLearnerMaster() {
// ... existing code ...
finalQuorumPeer.QuorumServermaster= (prescribedLearnerMaster == null)
?self.findLearnerMaster(findLeader())
: prescribedLearnerMaster;
// Add this line to ensure fresh DNS resolution
if (master != null) {
master.recreateSocketAddresses();
}
currentLearnerMaster = master;
// ... rest of existing code ...
}
```
> ZooKeeper observer master needs to dynamically resolve socket addresses
> -----------------------------------------------------------------------
>
> Key: ZOOKEEPER-5063
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-5063
> Project: ZooKeeper
> Issue Type: Bug
> Components: quorum, server
> Affects Versions: 4.0.0, 3.7.2, 3.10.0, 3.9.5, 3.8.6
> Environment: - Kubernetes deployments where ZooKeeper participants
> run as pods
> - Observer Master feature enabled (`observerMasterPort` configured)
> - DNS-based service discovery
> Reporter: Li Wang
> Assignee: Li Wang
> Priority: Major
>
> Observer Master feature does not dynamically recreate socket addresses when
> connecting to learner master, causing connection failures in Kubernetes
> environments where participant pods get rescheduled with new IP addresses.
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