HDFS-9904. testCheckpointCancellationDuringUpload occasionally fails. Contributed by Lin Yiqun.

(cherry picked from commit d457401784)

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

@@ -284,6 +284,11 @@ public class TestStandbyCheckpoints {
    */
   @Test(timeout=60000)
   public void testCheckpointCancellationDuringUpload() throws Exception {
+    // Set dfs.namenode.checkpoint.txns differently on the first NN to avoid it
+    // doing checkpoint when it becomes a standby
+    cluster.getConfiguration(0).setInt(
+        DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_TXNS_KEY, 1000);
+
     // don't compress, we want a big image
     cluster.getConfiguration(0).setBoolean(
         DFSConfigKeys.DFS_IMAGE_COMPRESS_KEY, false);