YARN-2213. Change proxy-user cookie log in AmIpFilter to DEBUG.

Contributed by Varun Saxena

hadoop-yarn-project/CHANGES.txt

@@ -837,6 +837,9 @@ Release 2.7.0 - UNRELEASED
     YARN-3393. Getting application(s) goes wrong when app finishes before
     starting the attempt. (Zhijie Shen via xgong)
 
+    YARN-2213. Change proxy-user cookie log in AmIpFilter to DEBUG.
+    (Varun Saxena via xgong)
+
 Release 2.6.0 - 2014-11-18
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-web-proxy/src/main/java/org/apache/hadoop/yarn/server/webproxy/amfilter/AmIpFilter.java

@@ -152,8 +152,10 @@ public void doFilter(ServletRequest req, ServletResponse resp,
       }
     }
     if (user == null) {
-      LOG.warn("Could not find " + WebAppProxyServlet.PROXY_USER_COOKIE_NAME
+      if (LOG.isDebugEnabled()) {
+        LOG.debug("Could not find " + WebAppProxyServlet.PROXY_USER_COOKIE_NAME
                  + " cookie, so user will not be set");
+      }
       chain.doFilter(req, resp);
     } else {
       final AmIpPrincipal principal = new AmIpPrincipal(user);