apache/dubbo

[Bug] Registry check does not work in the case of multiple registrations and subscriptions at the application level, and provider export error causes Dubbo to fail to start

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#15,003 opened on Dec 16, 2024

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 (11 comments) (0 reactions) (0 assignees)Java (41,524 stars) (26,453 forks)batch import
help wantedtype/enhancement

Description

Pre-check

  • I am sure that all the content I provide is in English.

Search before asking

  • I had searched in the issues and found no similar issues.

Apache Dubbo Component

Java SDK (apache/dubbo)

Dubbo Version

dubbo3.2.16; jdk openjdk21

Steps to reproduce this issue

Dubbo3.2.16 uses two Nacos clusters as registration centers to implement application level multi subscription and multi subscription, and configure regirty.check=false. When one of the Nacos clusters is unavailable, dubbo serviceConfig. export reports an error causing startup failure, with the error message 'this.registry is null'

What you expected to happen

When a Nacos cluster is unavailable, it should be possible to export services normally on another Nacos cluster and ignore the other Nacos cluster

Anything else

No response

Are you willing to submit a pull request to fix on your own?

  • Yes I am willing to submit a pull request on my own!

Code of Conduct

Contributor guide

Tech stack
java
Domain
backendinfrastructure
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
5
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
JavaApache DubboNacosconfiguration of multiple registries
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
15
Research direction
Investigate the ServiceConfig.export() method in the Apache Dubbo source code, particularly the logic that handles multiple registries and the registry check flag. Look at the RegistryProtocol class to understand how registries are initialized and why 'this.registry' might be null when one Nacos cluster is unavailable. Review comments in the issue for any specific code pointers or maintainer suggestions.