HADOOP-13244. o.a.h.ipc.Server#Server should honor handlerCount when queueSizePerHandler is specified in consturctor. Contributed by Kai Sasaki.

(cherry picked from commit 20b13d109a1f66d8911936d26bdde38d81a1c4c6)

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java

@@ -2469,7 +2469,7 @@ public abstract class Server {
     this.maxDataLength = conf.getInt(CommonConfigurationKeys.IPC_MAXIMUM_DATA_LENGTH,
         CommonConfigurationKeys.IPC_MAXIMUM_DATA_LENGTH_DEFAULT);
     if (queueSizePerHandler != -1) {
-      this.maxQueueSize = queueSizePerHandler;
+      this.maxQueueSize = handlerCount * queueSizePerHandler;
     } else {
       this.maxQueueSize = handlerCount * conf.getInt(
           CommonConfigurationKeys.IPC_SERVER_HANDLER_QUEUE_SIZE_KEY,

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/TestRPC.java

@@ -348,6 +348,10 @@ public class TestRPC extends TestRpcBase {
 
     assertEquals(3, server.getNumReaders());
     assertEquals(200, server.getMaxQueueSize());
+
+    server = newServerBuilder(conf).setQueueSizePerHandler(10)
+        .setNumHandlers(2).setVerbose(false).build();
+    assertEquals(2 * 10, server.getMaxQueueSize());
   }
 
   @Test