HBASE-23683 Make HBaseInterClusterReplicationEndpoint more extensible (…

…#1027)

Signed-off-by: Bharath Vissapragada <bharathv@apache.org>
Signed-off-by: Josh Elser <elserj@apache.org>
Signed-off-by: binlijin <binlijin@gmail.com>

hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/HBaseInterClusterReplicationEndpoint.java

@@ -113,6 +113,25 @@ public class HBaseInterClusterReplicationEndpoint extends HBaseReplicationEndpoi
   private boolean dropOnDeletedTables;
   private boolean isSerial = false;
 
+  /*
+   * Some implementations of HBaseInterClusterReplicationEndpoint may require instantiate different
+   * Connection implementations, or initialize it in a different way, so defining createConnection
+   * as protected for possible overridings.
+   */
+  protected AsyncClusterConnection createConnection(Configuration conf) throws IOException {
+    return ClusterConnectionFactory.createAsyncClusterConnection(conf,
+      null, User.getCurrent());
+  }
+
+  /*
+   * Some implementations of HBaseInterClusterReplicationEndpoint may require instantiate different
+   * ReplicationSinkManager implementations, or initialize it in a different way,
+   * so defining createReplicationSinkManager as protected for possible overridings.
+   */
+  protected ReplicationSinkManager createReplicationSinkManager(AsyncClusterConnection conn) {
+    return new ReplicationSinkManager(conn, this, this.conf);
+  }
+
   @Override
   public void init(Context context) throws IOException {
     super.init(context);
@@ -131,13 +150,12 @@ public void init(Context context) throws IOException {
     // TODO: This connection is replication specific or we should make it particular to
     // replication and make replication specific settings such as compression or codec to use
     // passing Cells.
-    this.conn =
-      ClusterConnectionFactory.createAsyncClusterConnection(conf, null, User.getCurrent());
+    this.conn = createConnection(this.conf);
     this.sleepForRetries =
         this.conf.getLong("replication.source.sleepforretries", 1000);
     this.metrics = context.getMetrics();
     // ReplicationQueueInfo parses the peerId out of the znode for us
-    this.replicationSinkMgr = new ReplicationSinkManager(conn, this, this.conf);
+    this.replicationSinkMgr = createReplicationSinkManager(conn);
     // per sink thread pool
     this.maxThreads = this.conf.getInt(HConstants.REPLICATION_SOURCE_MAXTHREADS_KEY,
       HConstants.REPLICATION_SOURCE_MAXTHREADS_DEFAULT);