YARN-7946. Update TimelineServerV2 doc as per YARN-7919. (Haibo Chen)

BUILDING.txt

@@ -138,6 +138,18 @@ Maven build goals:
   * Use -DskipShade to disable client jar shading to speed up build times (in
     development environments only, not to build release artifacts)
 
+ YARN Application Timeline Service V2 build options:
+
+   YARN Timeline Service v.2 chooses Apache HBase as the primary backing storage. The supported
+   versions of Apache HBase are 1.2.6 (default) and 2.0.0-beta1.
+
+  * HBase 1.2.6 is used by default to build Hadoop. The official releases are ready to use if you
+    plan on running Timeline Service v2 with HBase 1.2.6.
+
+  * Use -Dhbase.profile=2.0 to build Hadoop with HBase 2.0.0-beta1. Provide this option if you plan
+    on running Timeline Service v2 with HBase 2.0.
+
+
  Snappy build options:
 
    Snappy is a compression library that can be utilized by the native code.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/TimelineServiceV2.md

@@ -190,9 +190,9 @@ Each step is explained in more detail below.
 
 ##### <a name="Set_up_the_HBase_cluster"> </a>Step 1) Set up the HBase cluster
 The first part is to set up or pick an Apache HBase cluster to use as the storage cluster. The
-version of Apache HBase that is supported with Timeline Service v.2 is 1.2.6. The 1.0.x versions
-do not work with Timeline Service v.2. Later versions of HBase have not been tested with
-Timeline Service.
+supported versions of Apache HBase are 1.2.6 (default) and 2.0.0-beta1.
+The 1.0.x versions do not work with Timeline Service v.2. By default, Hadoop releases are built
+with HBase 1.2.6. To use HBase 2.0.0-beta1, build from source with option -Dhbase.profile=2.0
 
 HBase has different deployment modes. Refer to the HBase book for understanding them and pick a
 mode that is suitable for your setup.
@@ -236,7 +236,7 @@ is needed for the `flowrun` table creation in the schema creator. The default HD
 For example,
 
     hadoop fs -mkdir /hbase/coprocessor
-    hadoop fs -put hadoop-yarn-server-timelineservice-hbase-3.0.0-alpha1-SNAPSHOT.jar
+    hadoop fs -put hadoop-yarn-server-timelineservice-hbase-coprocessor-3.2.0-SNAPSHOT.jar
            /hbase/coprocessor/hadoop-yarn-server-timelineservice.jar