xiaoyuyao commented on a change in pull request #1489: HDDS-2019. Handle Set 
DtService of token in S3Gateway for OM HA.
URL: https://github.com/apache/hadoop/pull/1489#discussion_r329748308
 
 

 ##########
 File path: 
hadoop-ozone/s3gateway/src/main/java/org/apache/hadoop/ozone/s3/OzoneServiceProvider.java
 ##########
 @@ -20,33 +20,75 @@
 import org.apache.hadoop.hdds.conf.OzoneConfiguration;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.ozone.OmUtils;
+import org.apache.hadoop.ozone.s3.util.OzoneS3Util;
 import org.apache.hadoop.security.SecurityUtil;
 
 import javax.annotation.PostConstruct;
 import javax.enterprise.context.ApplicationScoped;
 import javax.enterprise.inject.Produces;
 import javax.inject.Inject;
+
+import java.util.Arrays;
+import java.util.Collection;
+
+import static org.apache.hadoop.ozone.om.OMConfigKeys.OZONE_OM_NODES_KEY;
+import static org.apache.hadoop.ozone.om.OMConfigKeys.OZONE_OM_SERVICE_IDS_KEY;
+
 /**
  * This class creates the OM service .
  */
 @ApplicationScoped
 public class OzoneServiceProvider {
 
-  private Text omServiceAdd;
+  private Text omServiceAddr;
+
+  private String omserviceID;
 
   @Inject
   private OzoneConfiguration conf;
 
   @PostConstruct
   public void init() {
-    omServiceAdd = SecurityUtil.buildTokenService(OmUtils.
-        getOmAddressForClients(conf));
+    Collection<String> serviceIdList =
+        conf.getTrimmedStringCollection(OZONE_OM_SERVICE_IDS_KEY);
+    if (serviceIdList.size() == 0) {
+      // Non-HA cluster
+      omServiceAddr = SecurityUtil.buildTokenService(OmUtils.
+          getOmAddressForClients(conf));
+    } else {
+      // HA cluster.
+      //For now if multiple service id's are configured we throw exception.
 
 Review comment:
   This is very similar to what HDFS HA does. Since OM support service 
discovery, can we get the internal service id via service discovery?

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