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: 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.
  
  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:
  
  
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:
  
  