HDFS-2043. TestHFlush failing intermittently. Contributed by Lin Yiqun.

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -170,6 +170,8 @@ Release 2.7.3 - UNRELEASED
     HDFS-10347. Namenode report bad block method doesn't log the bad block or
     datanode. (Rushabh Shah via kihwal)
 
+    HDFS-2043. TestHFlush failing intermittently. (Lin Yiqun via iwasakims)
+
 Release 2.7.2 - 2016-01-25
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestHFlush.java

@@ -484,8 +484,14 @@ public class TestHFlush {
         // If we got the exception, we shouldn't have interrupted status anymore.
         assertFalse(Thread.interrupted());
 
-        // Now do a successful close.
-        stm.close();
+        // Do the try-catch in the second stm.close() avoid that streamer was already
+        // closed in other places.
+        try {
+          // Now do a successful close.
+          stm.close();
+        } catch (IOException e) {
+          System.out.println("Got expected exception during second close");
+        }
       }