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From sunc...@apache.org
Subject [27/50] [abbrv] hadoop git commit: HDDS-620. ozone.scm.client.address should be an optional setting. Contributed by chencan and Arpit Agarwal.
Date Wed, 31 Oct 2018 18:23:38 GMT
HDDS-620. ozone.scm.client.address should be an optional setting. Contributed by chencan and
Arpit Agarwal.


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/496f0ffe
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/496f0ffe
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/496f0ffe

Branch: refs/heads/HDFS-12943
Commit: 496f0ffe9017b11d0d7c071bad259d132687c656
Parents: 3655e57
Author: Arpit Agarwal <arp@apache.org>
Authored: Mon Oct 29 17:14:15 2018 -0700
Committer: Arpit Agarwal <arp@apache.org>
Committed: Mon Oct 29 17:14:18 2018 -0700

----------------------------------------------------------------------
 .../java/org/apache/hadoop/hdds/HddsUtils.java  |  40 ++++-
 .../apache/hadoop/hdds/scm/HddsServerUtil.java  |  16 +-
 .../hadoop/hdds/scm/TestHddsServerUtils.java    | 153 +++++++++++++++++++
 .../ozone/client/TestHddsClientUtils.java       | 137 +++++++++++++++--
 4 files changed, 325 insertions(+), 21 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/496f0ffe/hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/HddsUtils.java
----------------------------------------------------------------------
diff --git a/hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/HddsUtils.java b/hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/HddsUtils.java
index 7a42a10..09fc75b 100644
--- a/hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/HddsUtils.java
+++ b/hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/HddsUtils.java
@@ -87,10 +87,22 @@ public final class HddsUtils {
    * @return Target InetSocketAddress for the SCM client endpoint.
    */
   public static InetSocketAddress getScmAddressForClients(Configuration conf) {
-    final Optional<String> host = getHostNameFromConfigKeys(conf,
+    Optional<String> host = getHostNameFromConfigKeys(conf,
         ScmConfigKeys.OZONE_SCM_CLIENT_ADDRESS_KEY);
 
     if (!host.isPresent()) {
+      // Fallback to Ozone SCM names.
+      Collection<InetSocketAddress> scmAddresses = getSCMAddresses(conf);
+      if (scmAddresses.size() > 1) {
+        throw new IllegalArgumentException(
+            ScmConfigKeys.OZONE_SCM_NAMES +
+                " must contain a single hostname. Multiple SCM hosts are " +
+                "currently unsupported");
+      }
+      host = Optional.of(scmAddresses.iterator().next().getHostName());
+    }
+
+    if (!host.isPresent()) {
       throw new IllegalArgumentException(
           ScmConfigKeys.OZONE_SCM_CLIENT_ADDRESS_KEY + " must be defined. See"
               + " https://wiki.apache.org/hadoop/Ozone#Configuration for "
@@ -109,7 +121,8 @@ public final class HddsUtils {
    * Retrieve the socket address that should be used by clients to connect
    * to the SCM for block service. If
    * {@link ScmConfigKeys#OZONE_SCM_BLOCK_CLIENT_ADDRESS_KEY} is not defined
-   * then {@link ScmConfigKeys#OZONE_SCM_CLIENT_ADDRESS_KEY} is used.
+   * then {@link ScmConfigKeys#OZONE_SCM_CLIENT_ADDRESS_KEY} is used. If neither
+   * is defined then {@link ScmConfigKeys#OZONE_SCM_NAMES} is used.
    *
    * @param conf
    * @return Target InetSocketAddress for the SCM block client endpoint.
@@ -123,13 +136,26 @@ public final class HddsUtils {
     if (!host.isPresent()) {
       host = getHostNameFromConfigKeys(conf,
           ScmConfigKeys.OZONE_SCM_CLIENT_ADDRESS_KEY);
-      if (!host.isPresent()) {
+    }
+
+    if (!host.isPresent()) {
+      // Fallback to Ozone SCM names.
+      Collection<InetSocketAddress> scmAddresses = getSCMAddresses(conf);
+      if (scmAddresses.size() > 1) {
         throw new IllegalArgumentException(
-            ScmConfigKeys.OZONE_SCM_BLOCK_CLIENT_ADDRESS_KEY
-                + " must be defined. See"
-                + " https://wiki.apache.org/hadoop/Ozone#Configuration"
-                + " for details on configuring Ozone.");
+            ScmConfigKeys.OZONE_SCM_NAMES +
+                " must contain a single hostname. Multiple SCM hosts are " +
+                "currently unsupported");
       }
+      host = Optional.of(scmAddresses.iterator().next().getHostName());
+    }
+
+    if (!host.isPresent()) {
+      throw new IllegalArgumentException(
+          ScmConfigKeys.OZONE_SCM_BLOCK_CLIENT_ADDRESS_KEY
+              + " must be defined. See"
+              + " https://wiki.apache.org/hadoop/Ozone#Configuration"
+              + " for details on configuring Ozone.");
     }
 
     final Optional<Integer> port = getPortNumberFromConfigKeys(conf,

http://git-wip-us.apache.org/repos/asf/hadoop/blob/496f0ffe/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/hdds/scm/HddsServerUtil.java
----------------------------------------------------------------------
diff --git a/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/hdds/scm/HddsServerUtil.java
b/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/hdds/scm/HddsServerUtil.java
index d505be3..395a77d 100644
--- a/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/hdds/scm/HddsServerUtil.java
+++ b/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/hdds/scm/HddsServerUtil.java
@@ -28,6 +28,7 @@ import org.slf4j.LoggerFactory;
 
 import java.io.File;
 import java.net.InetSocketAddress;
+import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.TimeUnit;
@@ -81,12 +82,25 @@ public final class HddsServerUtil {
     // target host.
     // - OZONE_SCM_DATANODE_ADDRESS_KEY
     // - OZONE_SCM_CLIENT_ADDRESS_KEY
+    // - OZONE_SCM_NAMES
     //
-    final Optional<String> host = getHostNameFromConfigKeys(conf,
+    Optional<String> host = getHostNameFromConfigKeys(conf,
         ScmConfigKeys.OZONE_SCM_DATANODE_ADDRESS_KEY,
         ScmConfigKeys.OZONE_SCM_CLIENT_ADDRESS_KEY);
 
     if (!host.isPresent()) {
+      // Fallback to Ozone SCM names.
+      Collection<InetSocketAddress> scmAddresses = getSCMAddresses(conf);
+      if (scmAddresses.size() > 1) {
+        throw new IllegalArgumentException(
+            ScmConfigKeys.OZONE_SCM_NAMES +
+                " must contain a single hostname. Multiple SCM hosts are " +
+                "currently unsupported");
+      }
+      host = Optional.of(scmAddresses.iterator().next().getHostName());
+    }
+
+    if (!host.isPresent()) {
       throw new IllegalArgumentException(
           ScmConfigKeys.OZONE_SCM_CLIENT_ADDRESS_KEY +
               " must be defined. See" +

http://git-wip-us.apache.org/repos/asf/hadoop/blob/496f0ffe/hadoop-hdds/server-scm/src/test/java/org/apache/hadoop/hdds/scm/TestHddsServerUtils.java
----------------------------------------------------------------------
diff --git a/hadoop-hdds/server-scm/src/test/java/org/apache/hadoop/hdds/scm/TestHddsServerUtils.java
b/hadoop-hdds/server-scm/src/test/java/org/apache/hadoop/hdds/scm/TestHddsServerUtils.java
new file mode 100644
index 0000000..21acda8
--- /dev/null
+++ b/hadoop-hdds/server-scm/src/test/java/org/apache/hadoop/hdds/scm/TestHddsServerUtils.java
@@ -0,0 +1,153 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.hdds.scm;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.junit.rules.Timeout;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.net.InetSocketAddress;
+
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_CLIENT_ADDRESS_KEY;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_DATANODE_ADDRESS_KEY;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_DATANODE_PORT_DEFAULT;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_NAMES;
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Unit tests for {@link HddsServerUtil}
+ */
+public class TestHddsServerUtils {
+  public static final Logger LOG = LoggerFactory.getLogger(
+      TestHddsServerUtils.class);
+
+  @Rule
+  public Timeout timeout = new Timeout(300_000);
+
+  @Rule
+  public ExpectedException thrown= ExpectedException.none();
+
+  /**
+   * Test getting OZONE_SCM_DATANODE_ADDRESS_KEY with port.
+   */
+  @Test
+  public void testGetDatanodeAddressWithPort() {
+    final String scmHost = "host123:100";
+    final Configuration conf = new OzoneConfiguration();
+    conf.set(OZONE_SCM_DATANODE_ADDRESS_KEY, scmHost);
+    final InetSocketAddress address =
+        HddsServerUtil.getScmAddressForDataNodes(conf);
+    assertEquals(address.getHostName(), scmHost.split(":")[0]);
+    assertEquals(address.getPort(), Integer.parseInt(scmHost.split(":")[1]));
+  }
+
+  /**
+   * Test getting OZONE_SCM_DATANODE_ADDRESS_KEY without port.
+   */
+  @Test
+  public void testGetDatanodeAddressWithoutPort() {
+    final String scmHost = "host123";
+    final Configuration conf = new OzoneConfiguration();
+    conf.set(OZONE_SCM_DATANODE_ADDRESS_KEY, scmHost);
+    final InetSocketAddress address =
+        HddsServerUtil.getScmAddressForDataNodes(conf);
+    assertEquals(address.getHostName(), scmHost);
+    assertEquals(address.getPort(), OZONE_SCM_DATANODE_PORT_DEFAULT);
+  }
+
+  /**
+   * When OZONE_SCM_DATANODE_ADDRESS_KEY is undefined, test fallback to
+   * OZONE_SCM_CLIENT_ADDRESS_KEY.
+   */
+  @Test
+  public void testDatanodeAddressFallbackToClientNoPort() {
+    final String scmHost = "host123";
+    final Configuration conf = new OzoneConfiguration();
+    conf.set(OZONE_SCM_CLIENT_ADDRESS_KEY, scmHost);
+    final InetSocketAddress address =
+        HddsServerUtil.getScmAddressForDataNodes(conf);
+    assertEquals(address.getHostName(), scmHost);
+    assertEquals(address.getPort(), OZONE_SCM_DATANODE_PORT_DEFAULT);
+  }
+
+  /**
+   * When OZONE_SCM_DATANODE_ADDRESS_KEY is undefined, test fallback to
+   * OZONE_SCM_CLIENT_ADDRESS_KEY. Port number defined by
+   * OZONE_SCM_CLIENT_ADDRESS_KEY should be ignored.
+   */
+  @Test
+  public void testDatanodeAddressFallbackToClientWithPort() {
+    final String scmHost = "host123:100";
+    final Configuration conf = new OzoneConfiguration();
+    conf.set(OZONE_SCM_CLIENT_ADDRESS_KEY, scmHost);
+    final InetSocketAddress address =
+        HddsServerUtil.getScmAddressForDataNodes(conf);
+    assertEquals(address.getHostName(), scmHost.split(":")[0]);
+    assertEquals(address.getPort(), OZONE_SCM_DATANODE_PORT_DEFAULT);
+  }
+
+  /**
+   * When OZONE_SCM_DATANODE_ADDRESS_KEY and OZONE_SCM_CLIENT_ADDRESS_KEY
+   * are undefined, test fallback to OZONE_SCM_NAMES.
+   */
+  @Test
+  public void testDatanodeAddressFallbackToScmNamesNoPort() {
+    final String scmHost = "host123";
+    final Configuration conf = new OzoneConfiguration();
+    conf.set(OZONE_SCM_NAMES, scmHost);
+    final InetSocketAddress address =
+        HddsServerUtil.getScmAddressForDataNodes(conf);
+    assertEquals(address.getHostName(), scmHost);
+    assertEquals(address.getPort(), OZONE_SCM_DATANODE_PORT_DEFAULT);
+  }
+
+  /**
+   * When OZONE_SCM_DATANODE_ADDRESS_KEY and OZONE_SCM_CLIENT_ADDRESS_KEY
+   * are undefined, test fallback to OZONE_SCM_NAMES. Port number
+   * defined by OZONE_SCM_NAMES should be ignored.
+   */
+  @Test
+  public void testDatanodeAddressFallbackToScmNamesWithPort() {
+    final String scmHost = "host123:100";
+    final Configuration conf = new OzoneConfiguration();
+    conf.set(OZONE_SCM_NAMES, scmHost);
+    final InetSocketAddress address =
+        HddsServerUtil.getScmAddressForDataNodes(conf);
+    assertEquals(address.getHostName(), scmHost.split(":")[0]);
+    assertEquals(address.getPort(), OZONE_SCM_DATANODE_PORT_DEFAULT);
+  }
+
+  /**
+   * getScmAddressForDataNodes should fail when OZONE_SCM_NAMES has
+   * multiple addresses.
+   */
+  @Test
+  public void testClientFailsWithMultipleScmNames() {
+    final String scmHost = "host123,host456";
+    final Configuration conf = new OzoneConfiguration();
+    conf.set(OZONE_SCM_NAMES, scmHost);
+    thrown.expect(IllegalArgumentException.class);
+    HddsServerUtil.getScmAddressForDataNodes(conf);
+  }
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/496f0ffe/hadoop-ozone/client/src/test/java/org/apache/hadoop/ozone/client/TestHddsClientUtils.java
----------------------------------------------------------------------
diff --git a/hadoop-ozone/client/src/test/java/org/apache/hadoop/ozone/client/TestHddsClientUtils.java
b/hadoop-ozone/client/src/test/java/org/apache/hadoop/ozone/client/TestHddsClientUtils.java
index 3aefe8a..9850778 100644
--- a/hadoop-ozone/client/src/test/java/org/apache/hadoop/ozone/client/TestHddsClientUtils.java
+++ b/hadoop-ozone/client/src/test/java/org/apache/hadoop/ozone/client/TestHddsClientUtils.java
@@ -19,9 +19,10 @@
 package org.apache.hadoop.ozone.client;
 
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdds.HddsUtils;
 import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+import org.apache.hadoop.ozone.OmUtils;
 import org.apache.hadoop.ozone.om.OMConfigKeys;
-import org.apache.hadoop.hdds.scm.ScmConfigKeys;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
@@ -29,9 +30,12 @@ import org.junit.rules.Timeout;
 
 import java.net.InetSocketAddress;
 
-import static org.apache.hadoop.hdds.HddsUtils.getScmAddressForClients;
-import static org.apache.hadoop.ozone.OmUtils.getOmAddress;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_BLOCK_CLIENT_PORT_DEFAULT;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_CLIENT_ADDRESS_KEY;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_CLIENT_PORT_DEFAULT;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_NAMES;
 import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertThat;
 
 /**
@@ -40,7 +44,7 @@ import static org.junit.Assert.assertThat;
  */
 public class TestHddsClientUtils {
   @Rule
-  public Timeout timeout = new Timeout(300000);
+  public Timeout timeout = new Timeout(300_000);
 
   @Rule
   public ExpectedException thrown= ExpectedException.none();
@@ -52,7 +56,7 @@ public class TestHddsClientUtils {
   public void testMissingScmClientAddress() {
     final Configuration conf = new OzoneConfiguration();
     thrown.expect(IllegalArgumentException.class);
-    getScmAddressForClients(conf);
+    HddsUtils.getScmAddressForClients(conf);
   }
 
   /**
@@ -65,15 +69,15 @@ public class TestHddsClientUtils {
 
     // First try a client address with just a host name. Verify it falls
     // back to the default port.
-    conf.set(ScmConfigKeys.OZONE_SCM_CLIENT_ADDRESS_KEY, "1.2.3.4");
-    InetSocketAddress addr = getScmAddressForClients(conf);
+    conf.set(OZONE_SCM_CLIENT_ADDRESS_KEY, "1.2.3.4");
+    InetSocketAddress addr = HddsUtils.getScmAddressForClients(conf);
     assertThat(addr.getHostString(), is("1.2.3.4"));
-    assertThat(addr.getPort(), is(ScmConfigKeys.OZONE_SCM_CLIENT_PORT_DEFAULT));
+    assertThat(addr.getPort(), is(OZONE_SCM_CLIENT_PORT_DEFAULT));
 
     // Next try a client address with a host name and port. Verify both
     // are used correctly.
-    conf.set(ScmConfigKeys.OZONE_SCM_CLIENT_ADDRESS_KEY, "1.2.3.4:100");
-    addr = getScmAddressForClients(conf);
+    conf.set(OZONE_SCM_CLIENT_ADDRESS_KEY, "1.2.3.4:100");
+    addr = HddsUtils.getScmAddressForClients(conf);
     assertThat(addr.getHostString(), is("1.2.3.4"));
     assertThat(addr.getPort(), is(100));
   }
@@ -85,21 +89,128 @@ public class TestHddsClientUtils {
     // First try a client address with just a host name. Verify it falls
     // back to the default port.
     conf.set(OMConfigKeys.OZONE_OM_ADDRESS_KEY, "1.2.3.4");
-    InetSocketAddress addr = getOmAddress(conf);
+    InetSocketAddress addr = OmUtils.getOmAddress(conf);
     assertThat(addr.getHostString(), is("1.2.3.4"));
     assertThat(addr.getPort(), is(OMConfigKeys.OZONE_OM_PORT_DEFAULT));
 
     // Next try a client address with just a host name and port. Verify the port
     // is ignored and the default OM port is used.
     conf.set(OMConfigKeys.OZONE_OM_ADDRESS_KEY, "1.2.3.4:100");
-    addr = getOmAddress(conf);
+    addr = OmUtils.getOmAddress(conf);
     assertThat(addr.getHostString(), is("1.2.3.4"));
     assertThat(addr.getPort(), is(100));
 
     // Assert the we are able to use default configs if no value is specified.
     conf.set(OMConfigKeys.OZONE_OM_ADDRESS_KEY, "");
-    addr = getOmAddress(conf);
+    addr = OmUtils.getOmAddress(conf);
     assertThat(addr.getHostString(), is("0.0.0.0"));
     assertThat(addr.getPort(), is(OMConfigKeys.OZONE_OM_PORT_DEFAULT));
   }
+
+  @Test
+  public void testBlockClientFallbackToClientNoPort() {
+    // When OZONE_SCM_BLOCK_CLIENT_ADDRESS_KEY is undefined it should
+    // fallback to OZONE_SCM_CLIENT_ADDRESS_KEY.
+    final String scmHost = "host123";
+    final Configuration conf = new OzoneConfiguration();
+    conf.set(OZONE_SCM_CLIENT_ADDRESS_KEY, scmHost);
+    final InetSocketAddress address =HddsUtils.getScmAddressForBlockClients(
+        conf);
+    assertEquals(address.getHostName(), scmHost);
+    assertEquals(address.getPort(), OZONE_SCM_BLOCK_CLIENT_PORT_DEFAULT);
+  }
+
+  @Test
+  public void testBlockClientFallbackToClientWithPort() {
+    // When OZONE_SCM_BLOCK_CLIENT_ADDRESS_KEY is undefined it should
+    // fallback to OZONE_SCM_CLIENT_ADDRESS_KEY.
+    //
+    // Verify that the OZONE_SCM_CLIENT_ADDRESS_KEY port number is ignored,
+    // if present. Instead we should use OZONE_SCM_BLOCK_CLIENT_PORT_DEFAULT.
+    final String scmHost = "host123:100";
+    final Configuration conf = new OzoneConfiguration();
+    conf.set(OZONE_SCM_CLIENT_ADDRESS_KEY, scmHost);
+    final InetSocketAddress address =HddsUtils.getScmAddressForBlockClients(
+        conf);
+    assertEquals(address.getHostName(), scmHost.split(":")[0]);
+    assertEquals(address.getPort(), OZONE_SCM_BLOCK_CLIENT_PORT_DEFAULT);
+  }
+
+  @Test
+  public void testBlockClientFallbackToScmNamesNoPort() {
+    // When OZONE_SCM_BLOCK_CLIENT_ADDRESS_KEY and OZONE_SCM_CLIENT_ADDRESS_KEY
+    // are undefined it should fallback to OZONE_SCM_NAMES.
+    final String scmHost = "host456";
+    final Configuration conf = new OzoneConfiguration();
+    conf.set(OZONE_SCM_NAMES, scmHost);
+    final InetSocketAddress address =HddsUtils.getScmAddressForBlockClients(
+        conf);
+    assertEquals(address.getHostName(), scmHost);
+    assertEquals(address.getPort(), OZONE_SCM_BLOCK_CLIENT_PORT_DEFAULT);
+  }
+
+  @Test
+  public void testBlockClientFallbackToScmNamesWithPort() {
+    // When OZONE_SCM_BLOCK_CLIENT_ADDRESS_KEY and OZONE_SCM_CLIENT_ADDRESS_KEY
+    // are undefined it should fallback to OZONE_SCM_NAMES.
+    //
+    // Verify that the OZONE_SCM_NAMES port number is ignored, if present.
+    // Instead we should use OZONE_SCM_BLOCK_CLIENT_PORT_DEFAULT.
+    final String scmHost = "host456:200";
+    final Configuration conf = new OzoneConfiguration();
+    conf.set(OZONE_SCM_NAMES, scmHost);
+    final InetSocketAddress address =HddsUtils.getScmAddressForBlockClients(
+        conf);
+    assertEquals(address.getHostName(), scmHost.split(":")[0]);
+    assertEquals(address.getPort(), OZONE_SCM_BLOCK_CLIENT_PORT_DEFAULT);
+  }
+
+  @Test
+  public void testClientFallbackToScmNamesNoPort() {
+    // When OZONE_SCM_CLIENT_ADDRESS_KEY is undefined, it should fallback
+    // to OZONE_SCM_NAMES.
+    final String scmHost = "host456";
+    final Configuration conf = new OzoneConfiguration();
+    conf.set(OZONE_SCM_NAMES, scmHost);
+    final InetSocketAddress address =HddsUtils.getScmAddressForClients(conf);
+    assertEquals(address.getHostName(), scmHost);
+    assertEquals(address.getPort(), OZONE_SCM_CLIENT_PORT_DEFAULT);
+  }
+
+  @Test
+  public void testClientFallbackToScmNamesWithPort() {
+    // When OZONE_SCM_CLIENT_ADDRESS_KEY is undefined, it should fallback
+    // to OZONE_SCM_NAMES.
+    //
+    // Verify that the OZONE_SCM_NAMES port number is ignored, if present.
+    // Instead we should use OZONE_SCM_BLOCK_CLIENT_PORT_DEFAULT.
+    final String scmHost = "host456:300";
+    final Configuration conf = new OzoneConfiguration();
+    conf.set(OZONE_SCM_NAMES, scmHost);
+    final InetSocketAddress address =HddsUtils.getScmAddressForClients(conf);
+    assertEquals(address.getHostName(), scmHost.split(":")[0]);
+    assertEquals(address.getPort(), OZONE_SCM_CLIENT_PORT_DEFAULT);
+  }
+
+  @Test
+  public void testBlockClientFailsWithMultipleScmNames() {
+    // When OZONE_SCM_BLOCK_CLIENT_ADDRESS_KEY and OZONE_SCM_CLIENT_ADDRESS_KEY
+    // are undefined, fail if OZONE_SCM_NAMES has multiple SCMs.
+    final String scmHost = "host123,host456";
+    final Configuration conf = new OzoneConfiguration();
+    conf.set(OZONE_SCM_NAMES, scmHost);
+    thrown.expect(IllegalArgumentException.class);
+    HddsUtils.getScmAddressForBlockClients(conf);
+  }
+
+  @Test
+  public void testClientFailsWithMultipleScmNames() {
+    // When OZONE_SCM_CLIENT_ADDRESS_KEY is undefined, fail if OZONE_SCM_NAMES
+    // has multiple SCMs.
+    final String scmHost = "host123,host456";
+    final Configuration conf = new OzoneConfiguration();
+    conf.set(OZONE_SCM_NAMES, scmHost);
+    thrown.expect(IllegalArgumentException.class);
+    HddsUtils.getScmAddressForClients(conf);
+  }
 }


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