[DOCFIX] Improve HBase doc

This doc change updates how Alluxio can work with HBase 2.0. One extra
parameter needs to be configured. Minor format updates besides that.

pr-link: #10450
change-id: cid-39aaab87d9e5e529f8f66058de1b9b0cbdefcd1f

docs/en/compute/HBase.md

@@ -30,29 +30,54 @@ Therefore, the configuration of Alluxio is done mostly in HBase configuration fi
 
 ### Set property in `hbase-site.xml`
 
-Change the `hbase.rootdir` property in `conf/hbase-site.xml`:
-> You do not need to create the `/hbase` directory in Alluxio, HBase will do this for you.
+Set the following properties in `conf/hbase-site.xml` and make sure all HBase cluster nodes
+have the configuration.
 
+Set the `hbase.rootdir` property as follows: 
 ```xml
 <property>
   <name>hbase.rootdir</name>
   <value>alluxio://master_hostname:port/hbase</value>
 </property>
 ```
 
-Add the following property to the same file `hbase-site.xml`.
-(make sure it is configured in all HBase cluster nodes):
+> You do not need to create the `/hbase` directory in Alluxio, HBase will do this for you.
+
+You also need to add the FS implementation classes to HBase configuration. These classes are provided in Alluxio Client jar.
+
+```xml
+<property>
+  <name>fs.alluxio.impl</name>
+  <value>alluxio.hadoop.FileSystem</value>
+</property>
+<property>
+  <name>fs.AbstractFileSystem.alluxio.impl</name>
+  <value>alluxio.hadoop.AlluxioFileSystem</value>
+</property>
+```
 
+Also add the following property to the same file `hbase-site.xml`:
 ```xml
 <property>
   <name>hbase.regionserver.hlog.syncer.count</name>
   <value>1</value>
 </property>
 ```
 
-This property is required to prevent HBase from flushing Alluxio file stream in a thread unsafe
+> This property is required to prevent HBase from flushing Alluxio file stream in a thread unsafe
 way.
 
+If you are running HBase version greater than 2.0, add the following property:
+
+```xml
+<property>
+  <name>hbase.unsafe.stream.capability.enforce</name>
+  <value>false</value>
+</property>
+```
+
+> This will disable HBase new stream capabilities (hflush/hsync) used for WAL.
+
 ### Distribute the Alluxio Client jar
 
 We need to make the Alluxio client jar file available to HBase, because it contains the configured
@@ -157,6 +182,12 @@ Instead of specifying the location of the jar file in the `$HBASE_CLASSPATH` env
 users could copy the `{{site.ALLUXIO_CLIENT_JAR_PATH}}` file into the `lib` directory of HBase
 (make sure it's available on all cluster nodes).
 
+```console
+$ cp `{{site.ALLUXIO_CLIENT_JAR_PATH}}` /path/to/hbase-master/lib/
+$ cp `{{site.ALLUXIO_CLIENT_JAR_PATH}}` /path/to/current/hbase-client/lib/
+$ cp `{{site.ALLUXIO_CLIENT_JAR_PATH}}` /path/to/hbase-regionserver/lib/
+```
+
 ## Troubleshooting
 
 ### Logging Configuration