Adding TransportCLient support for connecting to remote elasticsearch cluster

elasticsearch/src/main/java/com/yahoo/ycsb/db/ElasticSearchClient.java

@@ -14,7 +14,10 @@ import org.elasticsearch.action.search.SearchResponse;
 import org.elasticsearch.client.Client;
 import org.elasticsearch.client.Requests;
 import static org.elasticsearch.common.settings.ImmutableSettings.*;
+
+import org.elasticsearch.client.transport.TransportClient;
 import org.elasticsearch.common.settings.ImmutableSettings.Builder;
+import org.elasticsearch.common.transport.InetSocketTransportAddress;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import static org.elasticsearch.common.xcontent.XContentFactory.*;
 import static org.elasticsearch.index.query.FilterBuilders.*;
@@ -37,10 +40,13 @@ public class ElasticSearchClient extends DB {
 
     public static final String DEFAULT_CLUSTER_NAME = "es.ycsb.cluster";
     public static final String DEFAULT_INDEX_KEY = "es.ycsb";
+    public static final String DEFAULT_REMOTE_HOST = "localhost:9300";
     private Node node;
     private Client client;
     private String indexKey;
 
+    private Boolean remoteMode;
+
     /**
      * Initialize any state for this DB. Called once per DB instance; there is
      * one DB instance per client thread.
@@ -51,6 +57,8 @@ public class ElasticSearchClient extends DB {
         Properties props = getProperties();
         this.indexKey = props.getProperty("es.index.key", DEFAULT_INDEX_KEY);
         String clusterName = props.getProperty("cluster.name", DEFAULT_CLUSTER_NAME);
+        //Check if transport client needs to be used (To connect to multiple elasticsearch nodes)
+        remoteMode = Boolean.parseBoolean(props.getProperty("elasticsearch.remote", "false"));
         Boolean newdb = Boolean.parseBoolean(props.getProperty("elasticsearch.newdb", "false"));
         Builder settings = settingsBuilder()
                 .put("node.local", "true")
@@ -68,10 +76,28 @@ public class ElasticSearchClient extends DB {
         settings.put(props);
         System.out.println("ElasticSearch starting node = " + settings.get("cluster.name"));
         System.out.println("ElasticSearch node data path = " + settings.get("path.data"));
+        System.out.println("ElasticSearch Remote Mode = " +remoteMode);
+        //Remote mode support for connecting to remote elasticsearch cluster
+        if(remoteMode) {
+            settings.put("client.transport.sniff", true)
+                    .put("client.transport.ignore_cluster_name", false)
+                    .put("client.transport.ping_timeout", "30s")
+                    .put("client.transport.nodes_sampler_interval", "30s");
+            //Default it to localhost:9300
+            String nodeList[] =  props.getProperty("elasticsearch.hosts.list", DEFAULT_REMOTE_HOST).split(",");
+            System.out.println("ElasticSearch Remote Hosts = " +props.getProperty("elasticsearch.hosts.list", DEFAULT_REMOTE_HOST));
+            TransportClient tClient = new TransportClient(settings);
+            for(String h : nodeList) {
+                String node[] = h.split(":");
+                tClient.addTransportAddress(new InetSocketTransportAddress(node[0], Integer.parseInt(node[1])));
+            }
+            client = tClient;
+        } else { //Start node only if transport client mode is disabled
+            node = nodeBuilder().clusterName(clusterName).settings(settings).node();
+            node.start();
+            client = node.client();
+        }
 
-        node = nodeBuilder().clusterName(clusterName).settings(settings).node();
-        node.start();
-        client = node.client();
 
         if (newdb) {
             client.admin().indices().prepareDelete(indexKey).execute().actionGet();
@@ -86,10 +112,14 @@ public class ElasticSearchClient extends DB {
 
     @Override
     public void cleanup() throws DBException {
-        if (!node.isClosed()) {
+        if(!remoteMode) {
+            if (!node.isClosed()) {
+                client.close();
+                node.stop();
+                node.close();
+            }
+        } else {
             client.close();
-            node.stop();
-            node.close();
         }
     }