From c202a10923a46a6e7f7f518e6e3dbb6545dbb971 Mon Sep 17 00:00:00 2001
From: Varun Saxena <varunsaxena@apache.org>
Date: Thu, 10 Nov 2016 11:41:34 +0530
Subject: [PATCH] YARN-5862. TestDiskFailures.testLocalDirsFailures failed
 (Yufei Gu via Varun Saxena)

---
 .../java/org/apache/hadoop/yarn/server/TestDiskFailures.java  | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-tests/src/test/java/org/apache/hadoop/yarn/server/TestDiskFailures.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-tests/src/test/java/org/apache/hadoop/yarn/server/TestDiskFailures.java
index c7e34d87dd..bf82ec54a3 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-tests/src/test/java/org/apache/hadoop/yarn/server/TestDiskFailures.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-tests/src/test/java/org/apache/hadoop/yarn/server/TestDiskFailures.java
@@ -244,7 +244,9 @@ private void verifyDisksHealth(boolean localORLogDirs, String expectedDirs,
     for (int i = 0; i < 10; i++) {
       Iterator<RMNode> iter = yarnCluster.getResourceManager().getRMContext()
                               .getRMNodes().values().iterator();
-      if ((iter.next().getState() != NodeState.UNHEALTHY) == isHealthy) {
+      // RMNode # might be zero because of timing related issue.
+      if (iter.hasNext() &&
+          (iter.next().getState() != NodeState.UNHEALTHY) == isHealthy) {
         break;
       }
       // wait for the node health info to go to RM