HDDS-1801. Make Topology Aware Replication/Read non-default for ozone 0.4.1. Contributed by Xiaoyu Yao.

Signed-off-by: Anu Engineer <aengineer@apache.org>

hadoop-hdds/client/src/main/java/org/apache/hadoop/hdds/scm/XceiverClientGrpc.java

@@ -110,7 +110,8 @@ public class XceiverClientGrpc extends XceiverClientSpi {
   public void connect() throws Exception {
     // connect to the closest node, if closest node doesn't exist, delegate to
     // first node, which is usually the leader in the pipeline.
-    DatanodeDetails dn = this.pipeline.getClosestNode();
+    DatanodeDetails dn = topologyAwareRead ? this.pipeline.getClosestNode() :
+        this.pipeline.getFirstNode();
     // just make a connection to the picked datanode at the beginning
     connectToDatanode(dn, null);
   }
@@ -122,8 +123,8 @@ public class XceiverClientGrpc extends XceiverClientSpi {
   public void connect(String encodedToken) throws Exception {
     // connect to the closest node, if closest node doesn't exist, delegate to
     // first node, which is usually the leader in the pipeline.
-    DatanodeDetails dn;
-    dn = this.pipeline.getClosestNode();
+    DatanodeDetails dn = topologyAwareRead ? this.pipeline.getClosestNode() :
+        this.pipeline.getFirstNode();
     // just make a connection to the picked datanode at the beginning
     connectToDatanode(dn, encodedToken);
   }

hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/scm/ScmConfigKeys.java

@@ -317,10 +317,6 @@ public final class ScmConfigKeys {
   public static final String OZONE_SCM_CONTAINER_PLACEMENT_IMPL_KEY =
       "ozone.scm.container.placement.impl";
 
-  public static final String OZONE_SCM_CONTAINER_PLACEMENT_IMPL_DEFAULT =
-      "org.apache.hadoop.hdds.scm.container.placement.algorithms." +
-          "SCMContainerPlacementRackAware";
-
   public static final String OZONE_SCM_PIPELINE_OWNER_CONTAINER_COUNT =
       "ozone.scm.pipeline.owner.container.count";
   public static final int OZONE_SCM_PIPELINE_OWNER_CONTAINER_COUNT_DEFAULT = 3;
@@ -371,7 +367,7 @@ public final class ScmConfigKeys {
   public static final String DFS_NETWORK_TOPOLOGY_AWARE_READ_ENABLED =
       "dfs.network.topology.aware.read.enable";
   public static final String DFS_NETWORK_TOPOLOGY_AWARE_READ_ENABLED_DEFAULT =
-      "true";
+      "false";
 
   public static final String HDDS_TRACING_ENABLED = "hdds.tracing.enabled";
   public static final boolean HDDS_TRACING_ENABLED_DEFAULT = true;

hadoop-hdds/common/src/main/resources/ozone-default.xml

@@ -823,13 +823,13 @@
   <property>
     <name>ozone.scm.container.placement.impl</name>
     <value>
-      org.apache.hadoop.hdds.scm.container.placement.algorithms.SCMContainerPlacementRackAware
+      org.apache.hadoop.hdds.scm.container.placement.algorithms.SCMContainerPlacementRandom
     </value>
     <tag>OZONE, MANAGEMENT</tag>
     <description>
       The full name of class which implements org.apache.hadoop.hdds.scm.container.placement.algorithms.ContainerPlacementPolicy.
       The class decides which datanode will be used to host the container replica. If not set,
-      org.apache.hadoop.hdds.scm.container.placement.algorithms.SCMContainerPlacementRackAware will be used as default value.
+      org.apache.hadoop.hdds.scm.container.placement.algorithms.SCMContainerPlacementRandom will be used as default value.
     </description>
   </property>
   <property>
@@ -2347,7 +2347,7 @@
   </property>
   <property>
     <name>dfs.network.topology.aware.read.enable</name>
-    <value>true</value>
+    <value>false</value>
     <tag>OZONE, PERFORMANCE</tag>
     <description>
       Whether to enable topology aware read to improve the read performance.

hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/placement/algorithms/ContainerPlacementPolicyFactory.java

@@ -34,6 +34,10 @@ public final class ContainerPlacementPolicyFactory {
   private static final Logger LOG =
       LoggerFactory.getLogger(ContainerPlacementPolicyFactory.class);
 
+  private static final Class<? extends ContainerPlacementPolicy>
+      OZONE_SCM_CONTAINER_PLACEMENT_IMPL_DEFAULT =
+      SCMContainerPlacementRandom.class;
+
   private ContainerPlacementPolicyFactory() {
   }
 
@@ -42,7 +46,7 @@ public final class ContainerPlacementPolicyFactory {
       final boolean fallback) throws SCMException{
     final Class<? extends ContainerPlacementPolicy> placementClass = conf
         .getClass(ScmConfigKeys.OZONE_SCM_CONTAINER_PLACEMENT_IMPL_KEY,
-            SCMContainerPlacementRackAware.class,
+            OZONE_SCM_CONTAINER_PLACEMENT_IMPL_DEFAULT,
             ContainerPlacementPolicy.class);
     Constructor<? extends ContainerPlacementPolicy> constructor;
     try {

hadoop-ozone/dist/src/main/compose/ozone-topology/docker-config

@@ -26,11 +26,12 @@ OZONE-SITE.XML_ozone.scm.client.address=scm
 OZONE-SITE.XML_ozone.replication=1
 OZONE-SITE.XML_hdds.datanode.dir=/data/hdds
 OZONE-SITE.XML_hdds.profiler.endpoint.enabled=true
+OZONE-SITE.XML_ozone.scm.container.placement.impl=org.apache.hadoop.hdds.scm.container.placement.algorithms.SCMContainerPlacementRackAware
+OZONE-SITE.XML_net.topology.node.switch.mapping.impl=org.apache.hadoop.net.TableMapping
+OZONE-SITE.XML_net.topology.table.file.name=/opt/hadoop/compose/ozone-topology/network-config
+OZONE-SITE.XML_dfs.network.topology.aware.read.enable=true
 HDFS-SITE.XML_rpc.metrics.quantile.enable=true
 HDFS-SITE.XML_rpc.metrics.percentiles.intervals=60,300
-HDFS-SITE.XML_net.topology.node.switch.mapping.impl=org.apache.hadoop.net.TableMapping
-HDFS-SITE.XML_net.topology.table.file.name=/opt/hadoop/compose/ozone-topology/network-config
-HDFS-SITE.XML_dfs.network.topology.aware.read.enable=true
 ASYNC_PROFILER_HOME=/opt/profiler
 LOG4J.PROPERTIES_log4j.rootLogger=DEBUG, ARF
 LOG4J.PROPERTIES_log4j.appender.stdout=org.apache.log4j.ConsoleAppender