apache/dubbo

[Bug] Dubbo3.3.2 ，Can not Use broadcast and Tag same time

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#15850 opened on Dec 15, 2025

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help wantedtype/enhancement

Description

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  • 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

Dubbo 3.3.2

Steps to reproduce this issue

Start 4 service provider instances, each configured with different dubbo.provider.tag (e.g., t-01, t-02...) Consumer uses the following Reference configuration: @DubboReference( interfaceClass = BpRcvMsgApi.class, version = "1.0.0", group = "all-t", cluster = "broadcast" ) private ApiTest api; Invoke api.test() method Exception thrown: No provider available for the service

What you expected to happen

The broadcast call should succeed and send requests to all 4 provider instances.

Anything else

TagStateRouter filters out all providers in the router chain and returns an empty list, causing the call to fail. The issue is in org.apache.dubbo.rpc.cluster.router.tag.TagStateRouter.filterUsingStaticTag(),if tag is Null: result = filterInvoker( invokers, invoker -> StringUtils.isEmpty(invoker.getUrl().getParameter(TAG_KEY))); When tagRouterRule is not configured, this method performs static tag filtering with exact string matching. Since providers have tag=t-01 and broadcast requests don't specify a tag, the matching fails and eventually returns an empty list. Can at least one wildcard * be added?like: result = filterInvoker(invokers, invoker -> "*".equals(tag) || tag.equals(invoker.getUrl().getParameter(TAG_KEY)) );

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
backend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
JavaDubbo basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
The issue is in org.apache.dubbo.rpc.cluster.router.tag.TagStateRouter.filterUsingStaticTag() method. When tag is null, it performs static tag filtering with exact string matching, but since providers have tags and broadcast requests don't, it returns an empty list. A potential fix is to add a wildcard check so that when tag is '*', all providers are included. The contributor should examine this method and consider the suggested change, ensuring backward compatibility.