HDFS-12850. Ozone: TestContainerPersistence#testListContainer fails frequently due to timed out. Contributed by Yiqun Lin.

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/ozone/container/common/impl/TestContainerPersistence.java

@@ -322,14 +322,14 @@ public class TestContainerPersistence {
   }
 
   /**
-   * This test creates 1000 containers and reads them back 5 containers at a
+   * This test creates 50 containers and reads them back 5 containers at a
    * time and verifies that we did get back all containers.
    *
    * @throws IOException
    */
   @Test
   public void testListContainer() throws IOException {
-    final int count = 1000;
+    final int count = 50;
     final int step = 5;
 
     Map<String, ContainerData> testMap = new HashMap<>();