HADOOP-6400. Log errors getting Unix UGI. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@886645 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -38,6 +38,8 @@ Trunk (unreleased changes)
 
     HADOOP-6366. Reduce ivy console output to ovservable level (cos)
 
+    HADOOP-6400. Log errors getting Unix UGI. (Todd Lipcon via tomwhite)
+
   OPTIMIZATIONS
 
   BUG FIXES

src/java/org/apache/hadoop/security/UnixUserGroupInformation.java

@@ -244,6 +244,7 @@ public class UnixUserGroupInformation extends UserGroupInformation {
       try {
         userName =  getUnixUserName();
       } catch (Exception e) {
+        LOG.warn("Couldn't get unix username, using " + DEFAULT_USERNAME, e);
         userName = DEFAULT_USERNAME;
       }
 
@@ -263,6 +264,7 @@ public class UnixUserGroupInformation extends UserGroupInformation {
       try {
         groupNames = getUnixGroups();
       } catch (Exception e) {
+        LOG.warn("Couldn't get unix groups, using " + DEFAULT_GROUP, e);
         groupNames = new String[1];
         groupNames[0] = DEFAULT_GROUP;
       }