diff --git a/hadoop-yarn-project/CHANGES.txt b/hadoop-yarn-project/CHANGES.txt
index 59f3bbe3524..b5ecb17342f 100644
--- a/hadoop-yarn-project/CHANGES.txt
+++ b/hadoop-yarn-project/CHANGES.txt
@@ -241,6 +241,9 @@ Release 2.4.0 - UNRELEASED
     token for the right ResourceManager when HA is enabled. (Karthik Kambatla via
     vinodkv)
 
+    YARN-1785. FairScheduler treats app lookup failures as ERRORs. 
+    (bc Wong via kasha)
+
   OPTIMIZATIONS
 
   BUG FIXES
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairScheduler.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairScheduler.java
index dbadd2d10a1..9cc90bc7225 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairScheduler.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairScheduler.java
@@ -1094,7 +1094,9 @@ public class FairScheduler extends AbstractYarnScheduler {
       ApplicationAttemptId appAttemptId) {
     FSSchedulerApp attempt = getSchedulerApp(appAttemptId);
     if (attempt == null) {
-      LOG.error("Request for appInfo of unknown attempt" + appAttemptId);
+      if (LOG.isDebugEnabled()) {
+        LOG.debug("Request for appInfo of unknown attempt " + appAttemptId);
+      }
       return null;
     }
     return new SchedulerAppReport(attempt);
@@ -1105,7 +1107,9 @@ public class FairScheduler extends AbstractYarnScheduler {
       ApplicationAttemptId appAttemptId) {
     FSSchedulerApp attempt = getSchedulerApp(appAttemptId);
     if (attempt == null) {
-      LOG.error("Request for appInfo of unknown attempt" + appAttemptId);
+      if (LOG.isDebugEnabled()) {
+        LOG.debug("Request for appInfo of unknown attempt " + appAttemptId);
+      }
       return null;
     }
     return attempt.getResourceUsageReport();