YARN-11898. TestRMHA.testTransitionedToStandbyShouldNotHang hangs

This does NOT fix the issue, only adds a timeout to stop it from hanging
and reporting the error instead of hanging forever

Author: stoty

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestRMHA.java

@@ -22,6 +22,7 @@
 import java.io.File;
 import java.nio.file.Files;
 import java.util.UUID;
+import java.util.concurrent.TimeUnit;
 import java.util.function.Supplier;
 import org.apache.hadoop.test.GenericTestUtils;
 import org.apache.hadoop.util.concurrent.SubjectInheritingThread;
@@ -33,6 +34,7 @@
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.junit.jupiter.api.Assertions.fail;
+import static org.junit.jupiter.api.Timeout.ThreadMode.SEPARATE_THREAD;
 
 import java.io.IOException;
 import java.net.InetSocketAddress;
@@ -475,6 +477,7 @@ public synchronized void startInternal() throws Exception {
   }
 
   @Test
+  @Timeout(value=60, unit = TimeUnit.SECONDS, threadMode = SEPARATE_THREAD)
   public void testTransitionedToStandbyShouldNotHang() throws Exception {
     configuration.setBoolean(YarnConfiguration.AUTO_FAILOVER_ENABLED, false);
     Configuration conf = new YarnConfiguration(configuration);
@@ -611,7 +614,7 @@ protected void serviceStart() throws Exception {
   }
 
   @Test
-  @Timeout(value = 9000)
+  @Timeout(value = 9000) // FIXME that's more than two hours
   public void testTransitionedToActiveRefreshFail() throws Exception {
     configuration.setBoolean(YarnConfiguration.AUTO_FAILOVER_ENABLED, false);
     rm = new MockRM(configuration) {