diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/SplitLogManager.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/SplitLogManager.java
index 63af39854b7..2e2f8bf47d9 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/SplitLogManager.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/SplitLogManager.java
@@ -121,8 +121,12 @@ public class SplitLogManager {
       throws IOException {
     this.server = master;
     this.conf = conf;
+    // Get Server Thread name. Sometimes the Server is mocked so may not implement HasThread.
+    // For example, in tests.
+    String name = master instanceof HasThread? ((HasThread)master).getName():
+        master.getServerName().toShortString();
     this.choreService =
-        new ChoreService(((HasThread)master).getName() + ".splitLogManager.");
+        new ChoreService(name + ".splitLogManager.");
     if (server.getCoordinatedStateManager() != null) {
       SplitLogManagerCoordination coordination = getSplitLogManagerCoordination();
       Set<String> failedDeletions = Collections.synchronizedSet(new HashSet<String>());
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java
index 1f6523031af..e09b29b7c98 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java
@@ -1624,7 +1624,11 @@ public class AssignmentManager implements ServerListener {
   }
 
   private void startAssignmentThread() {
-    assignThread = new Thread(((HasThread)this.master).getName()) {
+    // Get Server Thread name. Sometimes the Server is mocked so may not implement HasThread.
+    // For example, in tests.
+    String name = master instanceof HasThread? ((HasThread)master).getName():
+        master.getServerName().toShortString();
+    assignThread = new Thread(name) {
       @Override
       public void run() {
         while (isRunning()) {