anchor.diff:  
       2. Start PXF on each segment host as described in [Starting PXF](../../pxf/5-15/cfginitstart_pxf.html#start_pxf).
   
  -    3. Exit this procedure.
  +    3. Skip the following steps and exit this procedure.
   
  -2. Initialize PXF on each segment host as described in [Initializing PXF](../../pxf/5-15/init_pxf.html). You may choose to use your existing `$PXF_CONF` for the initialization.
  +2. To continue using the PXF version included with the Greenplum Database installation, initialize PXF on each segment host as described in [Initializing PXF](../../pxf/5-15/init_pxf.html). You may choose to use your existing `$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:
   
  
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: If you are using PXF in your current Greenplum Database 6.x installation, you must perform some PXF upgrade actions when you upgrade to a newer version of Greenplum Database 6.x.
  
  The PXF upgrade procedure describes how to upgrade PXF in your Greenplum Database installation. This procedure uses *PXF.from* to refer to your currently-installed PXF version and *PXF.to* to refer to the PXF version installed when you upgrade to the new version of Greenplum Database.
  
  **Note**: if you are planning to upgrade PXF but not as part of a Greenplum Database upgrade, refer to the [PXF Documentation](../../pxf/5-15/upgrade_pxf_rpm.html)
  
  The PXF upgrade procedure has two parts. You perform one procedure before, and one procedure after, you upgrade to a new version of Greenplum Database:
  
  