diff --git a/hadoop-yarn-project/CHANGES.txt b/hadoop-yarn-project/CHANGES.txt
index 21ae6260bc6..0a6f76c06c6 100644
--- a/hadoop-yarn-project/CHANGES.txt
+++ b/hadoop-yarn-project/CHANGES.txt
@@ -52,6 +52,9 @@ Release 2.0.5-beta - UNRELEASED
     YARN-196. Nodemanager should be more robust in handling connection failure
     to ResourceManager when a cluster is started (Xuan Gong via hitesh)
 
+    YARN-485. TestProcfsProcessTree#testProcessTree() doesn't wait long enough 
+    for the process to die. (kkambatl via tucu)
+
 Release 2.0.4-alpha - UNRELEASED
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/util/TestProcfsBasedProcessTree.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/util/TestProcfsBasedProcessTree.java
index 528e03e4ead..13cf8689abe 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/util/TestProcfsBasedProcessTree.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/util/TestProcfsBasedProcessTree.java
@@ -18,6 +18,8 @@
 
 package org.apache.hadoop.yarn.util;
 
+import static org.junit.Assert.fail;
+
 import java.io.BufferedReader;
 import java.io.BufferedWriter;
 import java.io.File;
@@ -183,11 +185,20 @@ public class TestProcfsBasedProcessTree {
     // destroy the process and all its subprocesses
     destroyProcessTree(pid);
 
-    if (isSetsidAvailable()) { // whole processtree should be gone
-      Assert.assertFalse("Proceesses in process group live",
-          isAnyProcessInTreeAlive(p));
-    } else {// process should be gone
-      Assert.assertFalse("ProcessTree must have been gone", isAlive(pid));
+    boolean isAlive = true;
+    for (int tries = 100; tries > 0; tries--) {
+      if (isSetsidAvailable()) {// whole processtree
+        isAlive = isAnyProcessInTreeAlive(p);
+      } else {// process
+        isAlive = isAlive(pid);
+      }
+      if (!isAlive) {
+        break;
+      }
+      Thread.sleep(100);
+    }
+    if (isAlive) {
+      fail("ProcessTree shouldn't be alive");
     }
 
     LOG.info("Process-tree dump follows: \n" + processTreeDump);