docs - pxf default port is now 5888 (#4452)

gpdb-doc/dita/security-guide/topics/ports_and_protocols.xml

@@ -144,6 +144,12 @@
                 EXTERNAL TABLE</codeph> command specifies the host address and port number for the
               Hadoop namenode service. </entry>
           </row>
+          <row>
+            <entry>Greenplum Platform Extension Framework (PXF)</entry>
+            <entry>TCP 5888</entry>
+            <entry>The PXF Java service runs on port number 5888 on each Greenplum Database
+              segment host.</entry>
+          </row>
           <row otherprops="pivotal">
             <entry morerows="2">Greenplum Workload Manager (GP-WLM)</entry>
             <entry>TCP 4369, epmd</entry>

gpdb-doc/markdown/pxf/cfginitstart_pxf.html.md.erb

@@ -94,7 +94,7 @@ Perform the following procedure to initialize PXF on each segment host in your G
 
 ## <a id="start_pxf"></a>Starting PXF
 
-After initializing PXF, you must explicitly start PXF on each segment host in your Greenplum Database cluster. The PXF service, once started, runs as the `gpadmin` user on default port 51200. Only the `gpadmin` user can start and stop the PXF service.
+After initializing PXF, you must explicitly start PXF on each segment host in your Greenplum Database cluster. The PXF service, once started, runs as the `gpadmin` user on default port 5888. Only the `gpadmin` user can start and stop the PXF service.
 
 Perform the following procedure to start PXF on each segment host in your Greenplum Database cluster.  You will use the `gpssh` command and a `seghostfile` to run the command on multiple hosts.
 

gpdb-doc/markdown/pxf/troubleshooting_pxf.html.md.erb

@@ -31,7 +31,7 @@ The following table describes some errors you may encounter while using PXF:
 | Invalid URI pxf://\<path-to-data\>: missing options section | **Cause**: The `LOCATION` URI does not include the profile or other required options.<br>**Remedy**: Provide the profile and required options in the URI. |
 | org.apache.hadoop.mapred.InvalidInputException: Input path does not exist: hdfs://\<namenode\>:8020/\<path-to-file\> | **Cause**: The HDFS file you specified in \<path-to-file\> does not exist. <br>**Remedy**: Provide the path to an existing HDFS file. |
 | NoSuchObjectException(message:\<schema\>.\<hivetable\> table not found) | **Cause**: The Hive table you specified with \<schema\>.\<hivetable\> does not exist. <br>**Remedy**: Provide the name of an existing Hive table. |
-| Failed to connect to \<segment-host\> port 51200: Connection refused (libchurl.c:944)  (\<segment-id\> slice\<N\> \<segment-host\>:40000 pid=\<process-id\>)<br> ... |**Cause**: PXF is not running on \<segment-host\>.<br>**Remedy**: Restart PXF on \<segment-host\>. |
+| Failed to connect to \<segment-host\> port 5888: Connection refused (libchurl.c:944)  (\<segment-id\> slice\<N\> \<segment-host\>:40000 pid=\<process-id\>)<br> ... |**Cause**: PXF is not running on \<segment-host\>.<br>**Remedy**: Restart PXF on \<segment-host\>. |
 | *ERROR*: failed to acquire resources on one or more segments<br>*DETAIL*:  could not connect to server: Connection refused<br>&nbsp;&nbsp;&nbsp;&nbsp;Is the server running on host "\<segment-host\>" and accepting<br>&nbsp;&nbsp;&nbsp;&nbsp;TCP/IP connections on port 40000?(seg\<N\> \<segment-host\>:40000) | **Cause**: The Greenplum Database segment host \<segment-host\> is down.
 
 ## <a id="pxf-logging"></a>PXF Logging
@@ -91,7 +91,7 @@ dbname=# SELECT * FROM hdfstest;
 ...
 DEBUG2:  churl http header: cell #19: X-GP-URL-HOST: seghost1  (seg0 slice1 127.0.0.1:40000 pid=3981)
 CONTEXT:  External table hdfstest, file pxf://data/dir/hdfsfile?PROFILE=HdfsTextSimple
-DEBUG2:  churl http header: cell #20: X-GP-URL-PORT: 51200  (seg0 slice1 127.0.0.1:40000 pid=3981)
+DEBUG2:  churl http header: cell #20: X-GP-URL-PORT: 5888  (seg0 slice1 127.0.0.1:40000 pid=3981)
 CONTEXT:  External table hdfstest, file pxf://data/dir/hdfsfile?PROFILE=HdfsTextSimple
 DEBUG2:  churl http header: cell #21: X-GP-DATA-DIR: data/dir/hdfsfile  (seg0 slice1 127.0.0.1:40000 pid=3981)
 CONTEXT:  External table hdfstest, file pxf://data/dir/hdfsfile?PROFILE=HdfsTextSimple