From 0a45b39ab5a86a3c2ccc22eee04d0adc9a37c187 Mon Sep 17 00:00:00 2001
From: Qingtian Wang <wqt.net@gmail.com>
Date: Thu, 25 Apr 2024 22:36:51 -0500
Subject: [PATCH] + better worker context switch

---
 src/main/java/elf4j/engine/service/writer/GroupWriter.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/elf4j/engine/service/writer/GroupWriter.java b/src/main/java/elf4j/engine/service/writer/GroupWriter.java
index 2df9e86..01b2b36 100644
--- a/src/main/java/elf4j/engine/service/writer/GroupWriter.java
+++ b/src/main/java/elf4j/engine/service/writer/GroupWriter.java
@@ -120,7 +120,7 @@ private static List<LogWriterType> getLogWriterTypes(@NonNull LogServiceConfigur
 
     private static Runnable withMdcContext(Runnable task) {
         Map<String, String> callerContext = MDC.getCopyOfContextMap();
-        return (callerContext == null)
+        return (callerContext == null || callerContext.isEmpty())
                 ? task
                 : () -> {
                     Map<String, String> workerContext = replaceContextWith(callerContext);