HDFS-3501. Checkpointing with security enabled will stop working after ticket lifetime expires. Contributed by Aaron T. Myers

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1346108 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -150,6 +150,9 @@ Release 2.0.1-alpha - UNRELEASED
 
     HDFS-2025. Go Back to File View link is not working in tail.jsp.(Ashish and Sravan via umamahesh)
 
+    HDFS-3501. Checkpointing with security enabled will stop working
+    after ticket lifetime expires. (atm via eli)
+
 Release 2.0.0-alpha - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/GetImageServlet.java

@@ -160,6 +160,11 @@ public class GetImageServlet extends HttpServlet {
                 return null;
               }
               
+              // We may have lost our ticket since last checkpoint, log in again, just in case
+              if (UserGroupInformation.isSecurityEnabled()) {
+                UserGroupInformation.getCurrentUser().reloginFromKeytab();
+              }
+              
               // issue a HTTP get request to download the new fsimage 
               MD5Hash downloadImageDigest =
                 TransferFsImage.downloadImageToStorage(