diff --git a/kafka-impl/src/main/java/io/streamnative/pulsar/handlers/kop/coordinator/transaction/TransactionMarkerChannelManager.java b/kafka-impl/src/main/java/io/streamnative/pulsar/handlers/kop/coordinator/transaction/TransactionMarkerChannelManager.java
index 50225242f7..086f5805de 100644
--- a/kafka-impl/src/main/java/io/streamnative/pulsar/handlers/kop/coordinator/transaction/TransactionMarkerChannelManager.java
+++ b/kafka-impl/src/main/java/io/streamnative/pulsar/handlers/kop/coordinator/transaction/TransactionMarkerChannelManager.java
@@ -27,7 +27,6 @@
 import java.io.IOException;
 import java.net.InetSocketAddress;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
@@ -79,7 +78,8 @@ public class TransactionMarkerChannelManager {
 
     private final Bootstrap bootstrap;
 
-    private Map<InetSocketAddress, CompletableFuture<TransactionMarkerChannelHandler>> handlerMap = new HashMap<>();
+    private final Map<InetSocketAddress, CompletableFuture<TransactionMarkerChannelHandler>> handlerMap =
+            new ConcurrentHashMap<>();
 
     private TransactionStateManager txnStateManager;