[Backport 2.x] - create publication repos during join task execution (#16383)

server/src/internalClusterTest/java/org/opensearch/gateway/remote/RemotePublicationConfigurationIT.java

@@ -14,6 +14,7 @@
 import org.opensearch.remotemigration.MigrationBaseTestCase;
 import org.opensearch.remotestore.multipart.mocks.MockFsRepositoryPlugin;
 import org.opensearch.repositories.blobstore.BlobStoreRepository;
+import org.opensearch.repositories.fs.FsRepository;
 import org.opensearch.repositories.fs.ReloadableFsRepository;
 import org.opensearch.test.InternalSettingsPlugin;
 import org.opensearch.test.OpenSearchIntegTestCase;
@@ -97,23 +98,26 @@ public Settings.Builder remotePublishConfiguredNodeSetting() {
             .put(stateRepoSettingsAttributeKeyPrefix + prefixModeVerificationSuffix, true)
             .put(REMOTE_CLUSTER_STATE_ENABLED_SETTING.getKey(), true)
             .put("node.attr." + REMOTE_STORE_ROUTING_TABLE_REPOSITORY_NAME_ATTRIBUTE_KEY, ROUTING_TABLE_REPO_NAME)
-            .put(routingTableRepoTypeAttributeKey, ReloadableFsRepository.TYPE)
+            .put(routingTableRepoTypeAttributeKey, FsRepository.TYPE)
             .put(routingTableRepoSettingsAttributeKeyPrefix + "location", segmentRepoPath);
         return builder;
     }
 
     public Settings.Builder remoteWithRoutingTableNodeSetting() {
         // Remote Cluster with Routing table
+
         return Settings.builder()
             .put(
-                buildRemoteStoreNodeAttributes(
+                remoteStoreClusterSettings(
                     REPOSITORY_NAME,
                     segmentRepoPath,
+                    ReloadableFsRepository.TYPE,
                     REPOSITORY_2_NAME,
                     translogRepoPath,
+                    ReloadableFsRepository.TYPE,
                     REPOSITORY_NAME,
                     segmentRepoPath,
-                    false
+                    ReloadableFsRepository.TYPE
                 )
             )
             .put(REMOTE_CLUSTER_STATE_ENABLED_SETTING.getKey(), true);

server/src/main/java/org/opensearch/cluster/coordination/JoinTaskExecutor.java

@@ -43,6 +43,7 @@
 import org.opensearch.cluster.metadata.IndexMetadata;
 import org.opensearch.cluster.metadata.Metadata;
 import org.opensearch.cluster.metadata.RepositoriesMetadata;
+import org.opensearch.cluster.metadata.RepositoryMetadata;
 import org.opensearch.cluster.node.DiscoveryNode;
 import org.opensearch.cluster.node.DiscoveryNodes;
 import org.opensearch.cluster.routing.RerouteService;
@@ -59,6 +60,7 @@
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
@@ -190,11 +192,30 @@ public ClusterTasksResult<Task> execute(ClusterState currentState, List<Task> jo
         // for every set of node join task which we can optimize to not compute if cluster state already has
         // repository information.
         Optional<DiscoveryNode> remoteDN = currentNodes.getNodes().values().stream().filter(DiscoveryNode::isRemoteStoreNode).findFirst();
-        DiscoveryNode dn = remoteDN.orElseGet(() -> (currentNodes.getNodes().values()).stream().findFirst().get());
-        RepositoriesMetadata repositoriesMetadata = remoteStoreNodeService.updateRepositoriesMetadata(
-            dn,
-            currentState.getMetadata().custom(RepositoriesMetadata.TYPE)
-        );
+        Optional<DiscoveryNode> remotePublicationDN = currentNodes.getNodes()
+            .values()
+            .stream()
+            .filter(DiscoveryNode::isRemoteStatePublicationEnabled)
+            .findFirst();
+        RepositoriesMetadata existingRepositoriesMetadata = currentState.getMetadata().custom(RepositoriesMetadata.TYPE);
+        Map<String, RepositoryMetadata> repositories = new LinkedHashMap<>();
+        if (existingRepositoriesMetadata != null) {
+            existingRepositoriesMetadata.repositories().forEach(r -> repositories.putIfAbsent(r.name(), r));
+        }
+        if (remoteDN.isPresent()) {
+            RepositoriesMetadata repositoriesMetadata = remoteStoreNodeService.updateRepositoriesMetadata(
+                remoteDN.get(),
+                existingRepositoriesMetadata
+            );
+            repositoriesMetadata.repositories().forEach(r -> repositories.putIfAbsent(r.name(), r));
+        }
+        if (remotePublicationDN.isPresent()) {
+            RepositoriesMetadata repositoriesMetadata = remoteStoreNodeService.updateRepositoriesMetadata(
+                remotePublicationDN.get(),
+                existingRepositoriesMetadata
+            );
+            repositoriesMetadata.repositories().forEach(r -> repositories.putIfAbsent(r.name(), r));
+        }
 
         assert nodesBuilder.isLocalNodeElectedClusterManager();
 
@@ -224,15 +245,16 @@ public ClusterTasksResult<Task> execute(ClusterState currentState, List<Task> jo
                     ensureNodeCommissioned(node, currentState.metadata());
                     nodesBuilder.add(node);
 
-                    if (remoteDN.isEmpty() && node.isRemoteStoreNode()) {
+                    if ((remoteDN.isEmpty() && node.isRemoteStoreNode())
+                        || (remotePublicationDN.isEmpty() && node.isRemoteStatePublicationEnabled())) {
                         // This is hit only on cases where we encounter first remote node
                         logger.info("Updating system repository now for remote store");
-                        repositoriesMetadata = remoteStoreNodeService.updateRepositoriesMetadata(
+                        RepositoriesMetadata repositoriesMetadata = remoteStoreNodeService.updateRepositoriesMetadata(
                             node,
-                            currentState.getMetadata().custom(RepositoriesMetadata.TYPE)
+                            existingRepositoriesMetadata
                         );
+                        repositoriesMetadata.repositories().forEach(r -> repositories.putIfAbsent(r.name(), r));
                     }
-
                     nodesChanged = true;
                     minClusterNodeVersion = Version.min(minClusterNodeVersion, node.getVersion());
                     maxClusterNodeVersion = Version.max(maxClusterNodeVersion, node.getVersion());
@@ -246,7 +268,7 @@ public ClusterTasksResult<Task> execute(ClusterState currentState, List<Task> jo
             }
             results.success(joinTask);
         }
-
+        RepositoriesMetadata repositoriesMetadata = new RepositoriesMetadata(new ArrayList<>(repositories.values()));
         if (nodesChanged) {
             rerouteService.reroute(
                 "post-join reroute",

server/src/main/java/org/opensearch/node/remotestore/RemoteStoreNodeService.java

@@ -168,7 +168,7 @@ public void createAndVerifyRepositories(DiscoveryNode localNode) {
      * node repository metadata an exception will be thrown and the node will not be allowed to join the cluster.
      */
     public RepositoriesMetadata updateRepositoriesMetadata(DiscoveryNode joiningNode, RepositoriesMetadata existingRepositories) {
-        if (joiningNode.isRemoteStoreNode()) {
+        if (joiningNode.isRemoteStoreNode() || joiningNode.isRemoteStatePublicationEnabled()) {
             List<RepositoryMetadata> updatedRepositoryMetadataList = new ArrayList<>();
             List<RepositoryMetadata> newRepositoryMetadataList = new RemoteStoreNodeAttribute(joiningNode).getRepositoriesMetadata()
                 .repositories();