HDFS-6487. TestStandbyCheckpoint#testSBNCheckpoints is racy. Contributed by Mit Desai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1601017 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -153,6 +153,9 @@ Release 2.5.0 - UNRELEASED
     HDFS-6369. Document that BlockReader#available() can return more bytes than
     are remaining in the block (Ted Yu via Colin Patrick McCabe)
 
+    HDFS-6487. TestStandbyCheckpoint#testSBNCheckpoints is racy.
+    (Mit Desai via wang)
+
   OPTIMIZATIONS
 
     HDFS-6214. Webhdfs has poor throughput for files >2GB (daryn)

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestStandbyCheckpoints.java

@@ -153,6 +153,18 @@ public class TestStandbyCheckpoints {
     // do a checkpoint and save one to its local directories.
     HATestUtil.waitForCheckpoint(cluster, 1, ImmutableList.of(12));
 
+    GenericTestUtils.waitFor(new Supplier<Boolean>() {
+      @Override
+      public Boolean get() {
+        if(tmpOivImgDir.list().length > 0) {
+          return true;
+        }
+        else {
+          return false;
+        }
+      }
+    }, 1000, 60000);
+    
     // It should have saved the oiv image too.
     assertEquals("One file is expected", 1, tmpOivImgDir.list().length);