application configuration description improved.

Author: anouri

com.ibm.streamsx.hdfs/impl/java/src/com/ibm/streamsx/hdfs/IHdfsConstants.java

@@ -156,7 +156,7 @@ public class IHdfsConstants {
 
     public static final String DESC_BLOCK_SIZE = "This parameter specifies the maximum number of bytes to be read at one time when reading a file into binary mode (ie, into a blob); thus, it is the maximum size of the blobs on the output stream. The parameter is optional, and defaults to `4096` .";
 
-    public static final String DESC_CREDENTIALS ="This optional parameter specifies the JSON string that contains the hdfs credentials: `user`, `password` and `hdfsUri` or `webhdfs` . \\n\\n"
+    public static final String DESC_CREDENTIALS ="This optional parameter specifies the JSON string that contains the hdfs credentials key/value pairs for `user`, `password` and `webhdfs` . \\n\\n"
 			+ "This parameter can also be specified in an application configuration.\\n\\n"
     		+ "The JSON string must to have the following format:\\n\\n"
 	        + "    {\\n"
@@ -166,9 +166,10 @@ public class IHdfsConstants {
 			+ "    }\\n";
 
 
-    public static final String DESC_APP_CONFIG_NAME ="This optional parameter specifies the name of the application configuration that contains HDFS connection related configuration parameter 'credentials'. "
-    		+ " The `credentials` is a JSON string that contains `user` and `password` and `webhdfs` . "
-    		+ " If a value is specified in the application configuration and as operator parameter, the application configuration parameter value takes precedence. ";
+    public static final String DESC_APP_CONFIG_NAME ="This optional parameter specifies the name of the application configuration that contains HDFS connection related configuration parameter `credentials`. "
+    		+ " The `credentials` is a JSON string that contains key/value pairs for `user` and `password` and `webhdfs` . "
+    		+ " If a value is specified in the application configuration and as operator parameter, the application configuration parameter value takes precedence. "
+    		+ " An application configuration can be created in the Streams Console or using the `streamtool mkappconfig ... <configObject name>`.";
 
     public static final String DESC_SOURCE_FILE = "This parameter specifies the name of the file that the operator opens and reads. \\n"
             + "This parameter must be specified when the optional input port is not configured. \\n"

com.ibm.streamsx.hdfs/info.xml

@@ -168,10 +168,11 @@ The 'tempFile' parameter specifies the name of the file that the operator writes
 * `copyToLocalFile`   : Copies a file from HDFS file system to the local disk. 
 
 * It supports also two new parameters for all operators:
-* `credentials`        : A JSON string that contains `user`, `password`, `webhdfs`.
-* `appConfigName`      : Streams application configuration that defines `user`, `password`, and `webhdfs`.
+* `credentials`        : credentials is a JSON string that contains key/value pairs for `user` and `password` and `webhdfs` . 
+* `appConfigName`      : Streams application configuration that support `credentials`. And `credentials` is a JSON string that contains   `user` and `password` and `webhdfs`.
 
 * Adapting of streamsx.hdfs to support HDP 2.x and HDP 3.x file systems.
+* Adapting of com.ibm.streamsx.hdfs.client.webhdfs java package to support `knox` HttpURLConnection.
 * The pom.xml file has been upgraded to use Hadoop version 3.1.0 libraries.