[GitHub] [ozone] elek commented on a change in pull request #1636: HDDS-4496. Separate client and server2server GRPC services of datanode

[GitBox <gi...@apache.org>]

elek commented on a change in pull request #1636:
URL: https://github.com/apache/ozone/pull/1636#discussion_r536042955



##########
File path: hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/replication/ReplicationServer.java
##########
@@ -0,0 +1,147 @@
+/**
+ * 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
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.ozone.container.replication;
+
+import javax.net.ssl.SSLException;
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.hadoop.hdds.conf.Config;
+import org.apache.hadoop.hdds.conf.ConfigGroup;
+import org.apache.hadoop.hdds.conf.ConfigTag;
+import org.apache.hadoop.hdds.security.x509.SecurityConfig;
+import org.apache.hadoop.hdds.security.x509.certificate.client.CertificateClient;
+import org.apache.hadoop.hdds.tracing.GrpcServerInterceptor;
+import org.apache.hadoop.ozone.OzoneConsts;
+import org.apache.hadoop.ozone.container.ozoneimpl.ContainerController;
+
+import org.apache.ratis.thirdparty.io.grpc.Server;
+import org.apache.ratis.thirdparty.io.grpc.ServerBuilder;
+import org.apache.ratis.thirdparty.io.grpc.ServerInterceptors;
+import org.apache.ratis.thirdparty.io.grpc.netty.GrpcSslContexts;
+import org.apache.ratis.thirdparty.io.grpc.netty.NettyServerBuilder;
+import org.apache.ratis.thirdparty.io.netty.handler.ssl.ClientAuth;
+import org.apache.ratis.thirdparty.io.netty.handler.ssl.SslContextBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Separated network server for server2server container replication.
+ */
+public class ReplicationServer {
+
+  private static final Logger LOG =
+      LoggerFactory.getLogger(ReplicationServer.class);
+
+  private Server server;
+
+  private SecurityConfig secConf;
+
+  private CertificateClient caClient;
+
+  private ContainerController controller;
+
+  private int port;
+
+  public ReplicationServer(
+      ContainerController controller,
+      ReplicationConfig replicationConfig,
+      SecurityConfig secConf,
+      CertificateClient caClient
+  ) {
+    this.secConf = secConf;
+    this.caClient = caClient;
+    this.controller = controller;
+    this.port = replicationConfig.getPort();
+    init();
+  }
+
+  public void init() {
+    NettyServerBuilder nettyServerBuilder =
+        ((NettyServerBuilder) ServerBuilder.forPort(port))
+            .maxInboundMessageSize(OzoneConsts.OZONE_SCM_CHUNK_MAX_SIZE);
+
+    GrpcServerInterceptor tracingInterceptor = new GrpcServerInterceptor();
+    nettyServerBuilder
+        .addService(ServerInterceptors.intercept(new GrpcReplicationService(
+            new OnDemandContainerReplicationSource(controller)
+        ), tracingInterceptor));
+
+    if (secConf.isSecurityEnabled()) {
+      try {
+        SslContextBuilder sslContextBuilder = SslContextBuilder.forServer(
+            caClient.getPrivateKey(), caClient.getCertificate());
+
+        sslContextBuilder = GrpcSslContexts.configure(
+            sslContextBuilder, secConf.getGrpcSslProvider());
+
+        sslContextBuilder.clientAuth(ClientAuth.REQUIRE);
+        sslContextBuilder.trustManager(caClient.getCACertificate());
+
+        nettyServerBuilder.sslContext(sslContextBuilder.build());
+      } catch (SSLException ex) {
+        throw new IllegalArgumentException(
+            "Unable to setup TLS for secure datanode replication GRPC "
+                + "endpoint.", ex);
+      }
+    }
+
+    server = nettyServerBuilder.build();
+  }
+
+  public void start() throws IOException {
+    server.start();
+
+    port = server.getPort();
+
+    if (port == 0) {

Review comment:
       That's my fault. This is in the wrong order. here the `server.getPort()` should never be 0. `port` includes the final port number which is used in  `datanodeDetails.setPort(Name.REPLICATION, replicationServer.getPort());`. 
   
   But it was not clear as I used the wrong order. port check should be done before setting the variable. Fixed with:
   
   ```
       if (port == 0) {
         LOG.info("{} is started using port {}", getClass().getSimpleName(), server.getPort());
       }
   
       port = server.getPort();
   ```




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