[Doc] Add *HDFS2 sink connector guide* (#5226)

* Add *HDFS2 sink connector guide*

* Update

* Update

site2/docs/io-connectors.md

@@ -50,9 +50,9 @@ Pulsar has various sink connectors, which are sorted alphabetically as below.
 
 - [HBase sink connector](io-hbase.md)
 
-- [HDFS2 sink connector](io-hdfs2.md)
+- [HDFS2 sink connector](io-hdfs2-sink.md)
 
-- [HDFS3 sink connector](io-hdfs3.md)
+- [HDFS3 sink connector](io-hdfs3-sink.md)
 
 - [InfluxDB sink connector](io-influxdb-sink.md)
 

site2/docs/io-hdfs2-sink.md

@@ -0,0 +1,53 @@
+---
+id: io-hdfs2-sink
+title: HDFS2 sink connector
+sidebar_label: HDFS2 sink connector
+---
+
+The HDFS2 sink connector pulls the messages from Pulsar topics 
+and persists the messages to HDFS files.
+
+## Configuration
+
+The configuration of the HDFS2 sink connector has the following properties.
+
+### Property
+
+| Name | Type|Required | Default | Description 
+|------|----------|----------|---------|-------------|
+| `hdfsConfigResources` | String|true| None | A file or a comma-separated list containing the Hadoop file system configuration.<br/><br/>**Example**<br/>'core-site.xml'<br/>'hdfs-site.xml' |
+| `directory` | String | true | None|The HDFS directory where files read from or written to. |
+| `encoding` | String |false |None |The character encoding for the files.<br/><br/>**Example**<br/>UTF-8<br/>ASCII |
+| `compression` | Compression |false |None |The compression code used to compress or de-compress the files on HDFS. <br/><br/>Below are the available options:<br/><li>BZIP2<br/><li>DEFLATE<br/><li>GZIP<br/><li>LZ4<br/><li>SNAPPY|
+| `kerberosUserPrincipal` |String| false| None|The principal account of Kerberos user used for authentication. |
+| `keytab` | String|false|None| The full pathname of the Kerberos keytab file used for authentication. |
+| `filenamePrefix` |String| false |None |The prefix of the files created inside the HDFS directory.<br/><br/>**Example**<br/> The value of topicA result in files named topicA-. |
+| `fileExtension` | String| false | None| The extension added to the files written to HDFS.<br/><br/>**Example**<br/>'.txt'<br/> '.seq' |
+| `separator` | char|false |None |The character used to separate records in a text file. <br/><br/>If no value is provided, the contents from all records are concatenated together in one continuous byte array. |
+| `syncInterval` | long| false |0| The interval between calls to flush data to HDFS disk in milliseconds. |
+| `maxPendingRecords` |int| false|Integer.MAX_VALUE |  The maximum number of records that hold in memory before acking. <br/><br/>Setting this property to 1 makes every record send to disk before the record is acked.<br/><br/>Setting this property to a higher value allows buffering records before flushing them to disk. 
+
+### Example
+
+Before using the HDFS2 sink connector, you need to create a configuration file through one of the following methods.
+
+* JSON 
+
+    ```json
+    {
+        "hdfsConfigResources": "core-site.xml",
+        "directory": "/foo/bar",
+        "filenamePrefix": "prefix",
+        "compression": "SNAPPY"
+    }
+    ```
+
+* YAML
+
+    ```yaml
+    configs:
+        hdfsConfigResources: "core-site.xml"
+        directory: "/foo/bar"
+        filenamePrefix: "prefix"
+        compression: "SNAPPY"
+    ```