anchor.diff:      $ ssh gpadmin@<gpmaster>
       ```
   
  -2. If you installed the PXF `rpm` on your Greenplum 6 hosts:
  +2. If you installed the PXF `rpm` on your Greenplum 6 hosts, you must register it to continue using PXF:
      
       1. Copy the PXF extension files from the PXF installation directory to the new Greenplum 6 install directory:
   
  
positive.code:     gpadmin@gpmaster$ pxf version
      ```
  
  2. Stop PXF on each segment host as described in [Stopping PXF](../../pxf/5-15/cfginitstart_pxf.html#stop_pxf).
  
  3. Upgrade to the new version of Greenplum Database and then continue your PXF upgrade with [Step 2: Upgrading PXF](#pxfup).
  
  
  ## <a id="pxfup"></a>Step 2: Upgrading PXF
  
  After you upgrade to the new version of Greenplum Database, perform the following procedure to upgrade and configure the *PXF.to* software:
  
  
negative.code: 
      2. Start PXF on each segment host as described in [Starting PXF](../../pxf/5-15/cfginitstart_pxf.html#start_pxf).
  
      3. Skip the following steps and exit this procedure.
  
  2. To continue using the PXF version included with the Greenplum Database installation, initialize PXF on each segment host as described in [Initializing PXF](../../pxf/5-15/init_pxf.html). You may choose to use your existing `$PXF_CONF` for the initialization.
  
  3. **If you are upgrading from Greenplum Database version 6.1.x or earlier** and you have configured any JDBC servers that access Kerberos-secured Hive, you must now set the `hadoop.security.authentication` property to the `jdbc-site.xml` file to explicitly identify use of the Kerberos authentication method. Perform the following for each of these server configs:
  
  