diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/RWQueueRpcExecutor.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/RWQueueRpcExecutor.java
index e0203ab0012..68e7b6541f6 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/RWQueueRpcExecutor.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/RWQueueRpcExecutor.java
@@ -142,7 +142,7 @@ public class RWQueueRpcExecutor extends RpcExecutor {
     this.numScanQueues = numScanQueues;
     this.writeBalancer = getBalancer(numWriteQueues);
     this.readBalancer = getBalancer(numReadQueues);
-    this.scanBalancer = getBalancer(numScanQueues);
+    this.scanBalancer = numScanQueues > 0 ? getBalancer(numScanQueues) : null;
 
     queues = new ArrayList<BlockingQueue<CallRunner>>(numWriteQueues + numReadQueues + numScanQueues);
     LOG.debug(name + " writeQueues=" + numWriteQueues + " writeHandlers=" + writeHandlersCount +
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/ipc/TestSimpleRpcScheduler.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/ipc/TestSimpleRpcScheduler.java
index 97ef97369f0..8ae3078a270 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/ipc/TestSimpleRpcScheduler.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/ipc/TestSimpleRpcScheduler.java
@@ -250,6 +250,22 @@ public class TestSimpleRpcScheduler {
     }
   }
 
+  @Test
+  public void testScanQueueWithZeroScanRatio() throws Exception {
+    Configuration schedConf = HBaseConfiguration.create();
+    schedConf.setFloat(SimpleRpcScheduler.CALL_QUEUE_HANDLER_FACTOR_CONF_KEY, 1.0f);
+    schedConf.setFloat(SimpleRpcScheduler.CALL_QUEUE_READ_SHARE_CONF_KEY, 0.5f);
+    schedConf.setFloat(SimpleRpcScheduler.CALL_QUEUE_SCAN_SHARE_CONF_KEY, 0f);
+
+    PriorityFunction priority = mock(PriorityFunction.class);
+    when(priority.getPriority(any(RequestHeader.class), any(Message.class),
+      any(User.class))).thenReturn(HConstants.NORMAL_QOS);
+
+    RpcScheduler scheduler = new SimpleRpcScheduler(schedConf, 2, 1, 1, priority,
+                                                    HConstants.QOS_THRESHOLD);
+    assertNotEquals(scheduler, null);
+  }
+
   @Test
   public void testScanQueues() throws Exception {
     Configuration schedConf = HBaseConfiguration.create();