SteNicholas commented on code in PR #2346:
URL: 
https://github.com/apache/incubator-celeborn/pull/2346#discussion_r1508418112


##########
common/src/main/scala/org/apache/celeborn/common/util/PbSerDeUtils.scala:
##########
@@ -446,9 +447,24 @@ object PbSerDeUtils {
       builder.setCurrentAppDiskUsageMetricsSnapshot(
         toPbAppDiskUsageSnapshot(currentAppDiskUsageMetricsSnapshot))
     }
+    if (applicationMetas != null) {

Review Comment:
   ```suggestion
       if (CollectionUtils.isNotEmpty(applicationMetas)) {
   ```



##########
master/src/main/java/org/apache/celeborn/service/deploy/master/MasterSecretRegistryImpl.java:
##########
@@ -0,0 +1,49 @@
+/*
+ * 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.celeborn.service.deploy.master;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.celeborn.common.network.sasl.SecretRegistry;
+import org.apache.celeborn.common.network.sasl.SecretRegistryImpl;
+import org.apache.celeborn.service.deploy.master.clustermeta.IMetadataHandler;
+
+/**
+ * A simple implementation of {@link SecretRegistry} that stores secrets in 
memory and Ratis. This
+ * persists an application secret in Ratis but the deletion of that secret 
happens when
+ * ApplicationLost is triggered.
+ */
+public class MasterSecretRegistryImpl extends SecretRegistryImpl {
+
+  private static final Logger LOG = 
LoggerFactory.getLogger(MasterSecretRegistryImpl.class);
+  private IMetadataHandler metadataHandler;
+
+  @Override
+  public void register(String appId, String secret) {
+    super.register(appId, secret);
+    if (metadataHandler != null) {
+      LOG.info("Persisting metadata for appId: {}", appId);

Review Comment:
   ```suggestion
         LOG.info("Persisting application metadata for {} and {}.", appId, 
secret);
   ```



##########
worker/src/main/scala/org/apache/celeborn/service/deploy/worker/InternalRpcEndpoint.scala:
##########
@@ -28,16 +29,19 @@ import org.apache.celeborn.common.rpc._
  */
 private[celeborn] class InternalRpcEndpoint(
     override val rpcEnv: RpcEnv,
-    val conf: CelebornConf)
+    val conf: CelebornConf,
+    val secretRegistry: SecretRegistry)
   extends RpcEndpoint with Logging {
 
   override def onDisconnected(address: RpcAddress): Unit = {
     logDebug(s"Client $address got disconnected.")
   }
 
   override def receive: PartialFunction[Any, Unit] = {
-    // TODO: [CELEBORN-1234] Handle the application secret from the Master
-    case _ => throw new CelebornException(self + " not implemented")
+    case pb: PbApplicationMeta =>
+      val appId = pb.getAppId
+      val secret = pb.getSecret
+      logInfo(s"Received application meta for $appId from the coordinator")

Review Comment:
   ```suggestion
         logInfo(s"Received application meta for $appId and $secret from the 
coordinator")
   ```



##########
common/src/main/proto/TransportMessages.proto:
##########
@@ -98,6 +98,7 @@ enum MessageType {
   REGISTER_APPLICATION_RESPONSE = 75;
   WORKER_EVENT_REQUEST = 76;
   WORKER_EVENT_RESPONSE = 77;
+  APPLICATION_META = 78;

Review Comment:
   ```suggestion
     SAVE_APPLICATION_META = 78;
   ```



##########
master/src/main/java/org/apache/celeborn/service/deploy/master/clustermeta/IMetadataHandler.java:
##########
@@ -82,4 +82,6 @@ void handleWorkerEvent(
       int workerEventTypeValue, List<WorkerInfo> workerInfoList, String 
requestId);
 
   void handleUpdatePartitionSize();
+
+  void handleApplicationMeta(String appId, String secret);

Review Comment:
   Could we introduce `ApplicationMeta` to consturct metadata of application 
including appId, secret, and user identifer in future?



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