apache/dubbo

traceId missing from MDC in logs in Dubbo 3.3.2

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#16,165 opened on Mar 24, 2026

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Description

In Dubbo latest version 3.3.2, MDC.get("traceId") returns null even though the log pattern includes %X{traceId}. The call chain is web -> dubbo -> platform -> domains. Question: Is manual MDC.put required in a preHandler to propagate traceId?

Contributor guide

Research direction
Investigate how traceId is set in MDC in Dubbo 3.3.2 and whether a preHandler is needed for propagation.
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.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
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
JavaDubbo
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60