[Backport 2.x] Make Remote Publication a dynamic setting (#15937)

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

@@ -53,7 +53,6 @@
 import java.util.Set;
 
 import static org.opensearch.cluster.coordination.Coordinator.ZEN1_BWC_TERM;
-import static org.opensearch.gateway.remote.RemoteClusterStateService.REMOTE_PUBLICATION_SETTING;
 import static org.opensearch.node.remotestore.RemoteStoreNodeAttribute.isRemoteStoreClusterStateEnabled;
 
 /**
@@ -81,7 +80,6 @@ public class CoordinationState {
     private VotingConfiguration lastPublishedConfiguration;
     private VoteCollection publishVotes;
     private final boolean isRemoteStateEnabled;
-    private boolean isRemotePublicationEnabled;
 
     public CoordinationState(
         DiscoveryNode localNode,
@@ -105,14 +103,6 @@ public CoordinationState(
             .getLastAcceptedConfiguration();
         this.publishVotes = new VoteCollection();
         this.isRemoteStateEnabled = isRemoteStoreClusterStateEnabled(settings);
-        // ToDo: revisit this check while making the setting dynamic
-        this.isRemotePublicationEnabled = isRemoteStateEnabled
-            && REMOTE_PUBLICATION_SETTING.get(settings)
-            && localNode.isRemoteStatePublicationEnabled();
-    }
-
-    public boolean isRemotePublicationEnabled() {
-        return isRemotePublicationEnabled;
     }
 
     public long getCurrentTerm() {

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

@@ -189,9 +189,10 @@ public class Coordinator extends AbstractLifecycleComponent implements Discovery
     private Optional<CoordinatorPublication> currentPublication = Optional.empty();
     private final NodeHealthService nodeHealthService;
     private final PersistedStateRegistry persistedStateRegistry;
+    private final RemoteClusterStateService remoteClusterStateService;
     private final RemoteStoreNodeService remoteStoreNodeService;
     private NodeConnectionsService nodeConnectionsService;
-    private final RemoteClusterStateService remoteClusterStateService;
+    private final ClusterSettings clusterSettings;
 
     /**
      * @param nodeName The name of the node, used to name the {@link java.util.concurrent.ExecutorService} of the {@link SeedHostsResolver}.
@@ -316,6 +317,7 @@ public Coordinator(
         this.localNodeCommissioned = true;
         this.remoteStoreNodeService = remoteStoreNodeService;
         this.remoteClusterStateService = remoteClusterStateService;
+        this.clusterSettings = clusterSettings;
     }
 
     private ClusterFormationState getClusterFormationState() {
@@ -1365,7 +1367,7 @@ assert getLocalNode().equals(clusterState.getNodes().get(getLocalNode().getId())
 
                 final PublicationTransportHandler.PublicationContext publicationContext = publicationHandler.newPublicationContext(
                     clusterChangedEvent,
-                    coordinationState.get().isRemotePublicationEnabled(),
+                    this.isRemotePublicationEnabled(),
                     persistedStateRegistry
                 );
                 logger.debug("initialized PublicationContext using class: {}", publicationContext.getClass().toString());
@@ -1900,8 +1902,8 @@ public static boolean isZen1Node(DiscoveryNode discoveryNode) {
     }
 
     public boolean isRemotePublicationEnabled() {
-        if (coordinationState.get() != null) {
-            return coordinationState.get().isRemotePublicationEnabled();
+        if (remoteClusterStateService != null) {
+            return remoteClusterStateService.isRemotePublicationEnabled();
         }
         return false;
     }

server/src/main/java/org/opensearch/cluster/routing/remote/InternalRemoteRoutingTableService.java

@@ -49,7 +49,7 @@
 import java.util.function.Supplier;
 import java.util.stream.Collectors;
 
-import static org.opensearch.node.remotestore.RemoteStoreNodeAttribute.isRemoteRoutingTableEnabled;
+import static org.opensearch.node.remotestore.RemoteStoreNodeAttribute.isRemoteRoutingTableConfigured;
 
 /**
  * A Service which provides APIs to upload and download routing table from remote store.
@@ -76,7 +76,7 @@ public InternalRemoteRoutingTableService(
         ThreadPool threadpool,
         String clusterName
     ) {
-        assert isRemoteRoutingTableEnabled(settings) : "Remote routing table is not enabled";
+        assert isRemoteRoutingTableConfigured(settings) : "Remote routing table is not enabled";
         this.repositoriesService = repositoriesService;
         this.settings = settings;
         this.threadPool = threadpool;
@@ -233,7 +233,7 @@ protected void doClose() throws IOException {
 
     @Override
     protected void doStart() {
-        assert isRemoteRoutingTableEnabled(settings) == true : "Remote routing table is not enabled";
+        assert isRemoteRoutingTableConfigured(settings) == true : "Remote routing table is not enabled";
         final String remoteStoreRepo = settings.get(
             Node.NODE_ATTRIBUTES.getKey() + RemoteStoreNodeAttribute.REMOTE_STORE_ROUTING_TABLE_REPOSITORY_NAME_ATTRIBUTE_KEY
         );

server/src/main/java/org/opensearch/cluster/routing/remote/RemoteRoutingTableServiceFactory.java

@@ -15,7 +15,7 @@
 
 import java.util.function.Supplier;
 
-import static org.opensearch.node.remotestore.RemoteStoreNodeAttribute.isRemoteRoutingTableEnabled;
+import static org.opensearch.node.remotestore.RemoteStoreNodeAttribute.isRemoteRoutingTableConfigured;
 
 /**
  * Factory to provide impl for RemoteRoutingTableService based on settings.
@@ -37,7 +37,7 @@ public static RemoteRoutingTableService getService(
         ThreadPool threadPool,
         String clusterName
     ) {
-        if (isRemoteRoutingTableEnabled(settings)) {
+        if (isRemoteRoutingTableConfigured(settings)) {
             return new InternalRemoteRoutingTableService(repositoriesService, settings, clusterSettings, threadPool, clusterName);
         }
         return new NoopRemoteRoutingTableService();

server/src/main/java/org/opensearch/gateway/remote/RemoteClusterStateService.java

@@ -83,6 +83,7 @@
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.Function;
 import java.util.function.LongSupplier;
@@ -112,6 +113,8 @@
 import static org.opensearch.gateway.remote.model.RemoteTransientSettingsMetadata.TRANSIENT_SETTING_METADATA;
 import static org.opensearch.gateway.remote.routingtable.RemoteIndexRoutingTable.INDEX_ROUTING_METADATA_PREFIX;
 import static org.opensearch.node.remotestore.RemoteStoreNodeAttribute.isRemoteClusterStateConfigured;
+import static org.opensearch.node.remotestore.RemoteStoreNodeAttribute.isRemoteRoutingTableConfigured;
+import static org.opensearch.node.remotestore.RemoteStoreNodeAttribute.isRemoteStoreClusterStateEnabled;
 
 /**
  * A Service which provides APIs to upload and download cluster metadata from remote store.
@@ -132,7 +135,7 @@
         REMOTE_PUBLICATION_SETTING_KEY,
         false,
         Property.NodeScope,
-        Property.Final
+        Property.Dynamic
     );
 
     /**
@@ -232,7 +235,7 @@
     private final String METADATA_UPDATE_LOG_STRING = "wrote metadata for [{}] indices and skipped [{}] unchanged "
         + "indices, coordination metadata updated : [{}], settings metadata updated : [{}], templates metadata "
         + "updated : [{}], custom metadata updated : [{}], indices routing updated : [{}]";
-    private final boolean isPublicationEnabled;
+    private volatile AtomicBoolean isPublicationEnabled;
     private final String remotePathPrefix;
 
     private final RemoteClusterStateCache remoteClusterStateCache;
@@ -273,9 +276,12 @@
         this.remoteStateStats = new RemotePersistenceStats();
         this.namedWriteableRegistry = namedWriteableRegistry;
         this.indexMetadataUploadListeners = indexMetadataUploadListeners;
-        this.isPublicationEnabled = REMOTE_PUBLICATION_SETTING.get(settings)
-            && RemoteStoreNodeAttribute.isRemoteStoreClusterStateEnabled(settings)
-            && RemoteStoreNodeAttribute.isRemoteRoutingTableEnabled(settings);
+        this.isPublicationEnabled = new AtomicBoolean(
+            clusterSettings.get(REMOTE_PUBLICATION_SETTING)
+                && RemoteStoreNodeAttribute.isRemoteStoreClusterStateEnabled(settings)
+                && RemoteStoreNodeAttribute.isRemoteRoutingTableConfigured(settings)
+        );
+        clusterSettings.addSettingsUpdateConsumer(REMOTE_PUBLICATION_SETTING, this::setRemotePublicationSetting);
         this.remotePathPrefix = CLUSTER_REMOTE_STORE_STATE_PATH_PREFIX.get(settings);
         this.remoteRoutingTableService = RemoteRoutingTableServiceFactory.getService(
             repositoriesService,
@@ -303,19 +309,20 @@
             return null;
         }
 
+        boolean publicationEnabled = isPublicationEnabled.get();
         UploadedMetadataResults uploadedMetadataResults = writeMetadataInParallel(
             clusterState,
             new ArrayList<>(clusterState.metadata().indices().values()),
             emptyMap(),
-            RemoteGlobalMetadataManager.filterCustoms(clusterState.metadata().customs(), isPublicationEnabled),
+            RemoteGlobalMetadataManager.filterCustoms(clusterState.metadata().customs(), publicationEnabled),
             true,
             true,
             true,
-            isPublicationEnabled,
-            isPublicationEnabled,
-            isPublicationEnabled,
-            isPublicationEnabled ? clusterState.customs() : Collections.emptyMap(),
-            isPublicationEnabled,
+            publicationEnabled,
+            publicationEnabled,
+            publicationEnabled,
+            publicationEnabled ? clusterState.customs() : Collections.emptyMap(),
+            publicationEnabled,
             remoteRoutingTableService.getIndicesRouting(clusterState.getRoutingTable()),
             null
         );
@@ -394,9 +401,9 @@
         boolean firstUploadForSplitGlobalMetadata = !previousManifest.hasMetadataAttributesFiles();
 
         final DiffableUtils.MapDiff<String, Metadata.Custom, Map<String, Metadata.Custom>> customsDiff = remoteGlobalMetadataManager
-            .getCustomsDiff(clusterState, previousClusterState, firstUploadForSplitGlobalMetadata, isPublicationEnabled);
+            .getCustomsDiff(clusterState, previousClusterState, firstUploadForSplitGlobalMetadata, isPublicationEnabled.get());
         final DiffableUtils.MapDiff<String, ClusterState.Custom, Map<String, ClusterState.Custom>> clusterStateCustomsDiff =
-            remoteClusterStateAttributesManager.getUpdatedCustoms(clusterState, previousClusterState, isPublicationEnabled, false);
+            remoteClusterStateAttributesManager.getUpdatedCustoms(clusterState, previousClusterState, isPublicationEnabled.get(), false);
         final Map<String, UploadedMetadataAttribute> allUploadedCustomMap = new HashMap<>(previousManifest.getCustomMetadataMap());
         final Map<String, UploadedMetadataAttribute> allUploadedClusterStateCustomsMap = new HashMap<>(
             previousManifest.getClusterStateCustomMap()
@@ -461,10 +468,10 @@
         boolean updateTemplatesMetadata = firstUploadForSplitGlobalMetadata
             || Metadata.isTemplatesMetadataEqual(previousClusterState.metadata(), clusterState.metadata()) == false;
 
-        final boolean updateDiscoveryNodes = isPublicationEnabled
+        final boolean updateDiscoveryNodes = isPublicationEnabled.get()
             && clusterState.getNodes().delta(previousClusterState.getNodes()).hasChanges();
-        final boolean updateClusterBlocks = isPublicationEnabled && !clusterState.blocks().equals(previousClusterState.blocks());
-        final boolean updateHashesOfConsistentSettings = isPublicationEnabled
+        final boolean updateClusterBlocks = isPublicationEnabled.get() && !clusterState.blocks().equals(previousClusterState.blocks());
+        final boolean updateHashesOfConsistentSettings = isPublicationEnabled.get()
             && Metadata.isHashesOfConsistentSettingsEqual(previousClusterState.metadata(), clusterState.metadata()) == false;
 
         uploadedMetadataResults = writeMetadataInParallel(
@@ -1115,6 +1122,14 @@
         this.remoteClusterStateValidationMode = remoteClusterStateValidationMode;
     }
 
+    private void setRemotePublicationSetting(boolean remotePublicationSetting) {
+        if (remotePublicationSetting == false) {
+            this.isPublicationEnabled.set(false);
+        } else {
+            this.isPublicationEnabled.set(isRemoteStoreClusterStateEnabled(settings) && isRemoteRoutingTableConfigured(settings));
+        }
+    }
+
     // Package private for unit test
     RemoteRoutingTableService getRemoteRoutingTableService() {
         return this.remoteRoutingTableService;
@@ -1830,7 +1845,7 @@
     }
 
     public boolean isRemotePublicationEnabled() {
-        return this.isPublicationEnabled;
+        return this.isPublicationEnabled.get();
     }
 
     public void setRemoteStateReadTimeout(TimeValue remoteStateReadTimeout) {

server/src/main/java/org/opensearch/gateway/remote/RemotePersistenceStats.java

@@ -21,8 +21,8 @@ public class RemotePersistenceStats {
     RemoteDownloadStats remoteDiffDownloadStats;
     RemoteDownloadStats remoteFullDownloadStats;
 
-    final String FULL_DOWNLOAD_STATS = "remote_full_download";
-    final String DIFF_DOWNLOAD_STATS = "remote_diff_download";
+    public static final String FULL_DOWNLOAD_STATS = "remote_full_download";
+    public static final String DIFF_DOWNLOAD_STATS = "remote_diff_download";
 
     public RemotePersistenceStats() {
         remoteUploadStats = new RemoteUploadStats();

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

@@ -202,7 +202,7 @@ private static boolean isRemoteRoutingTableAttributePresent(Settings settings) {
             .isEmpty() == false;
     }
 
-    public static boolean isRemoteRoutingTableEnabled(Settings settings) {
+    public static boolean isRemoteRoutingTableConfigured(Settings settings) {
         return isRemoteRoutingTableAttributePresent(settings);
     }
 

server/src/test/java/org/opensearch/cluster/coordination/CoordinationStateTests.java

@@ -68,7 +68,6 @@
 import static java.util.Collections.emptyMap;
 import static java.util.Collections.emptySet;
 import static org.opensearch.gateway.remote.ClusterMetadataManifest.MANIFEST_CURRENT_CODEC_VERSION;
-import static org.opensearch.gateway.remote.RemoteClusterStateService.REMOTE_CLUSTER_STATE_ENABLED_SETTING;
 import static org.opensearch.gateway.remote.RemoteClusterStateService.REMOTE_PUBLICATION_SETTING_KEY;
 import static org.opensearch.node.remotestore.RemoteStoreNodeAttribute.REMOTE_STORE_CLUSTER_STATE_REPOSITORY_NAME_ATTRIBUTE_KEY;
 import static org.opensearch.node.remotestore.RemoteStoreNodeAttribute.REMOTE_STORE_REPOSITORY_SETTINGS_ATTRIBUTE_KEY_PREFIX;
@@ -1268,16 +1267,6 @@ public void testHandleCommitOnFollowerNodeWhenRemotePublicationEnabledWithNullRe
         verifyNoInteractions(remoteClusterStateService);
     }
 
-    public void testIsRemotePublicationEnabled_WithInconsistentSettings() {
-        // create settings with remote state disabled but publication enabled
-        Settings settings = Settings.builder()
-            .put(REMOTE_CLUSTER_STATE_ENABLED_SETTING.getKey(), false)
-            .put(REMOTE_PUBLICATION_SETTING_KEY, true)
-            .build();
-        CoordinationState coordinationState = createCoordinationState(psr1, node1, settings);
-        assertFalse(coordinationState.isRemotePublicationEnabled());
-    }
-
     public static CoordinationState createCoordinationState(
         PersistedStateRegistry persistedStateRegistry,
         DiscoveryNode localNode,

server/src/test/java/org/opensearch/gateway/remote/RemoteClusterStateServiceTests.java

@@ -151,7 +151,7 @@
 import static org.opensearch.node.remotestore.RemoteStoreNodeAttribute.REMOTE_STORE_REPOSITORY_SETTINGS_ATTRIBUTE_KEY_PREFIX;
 import static org.opensearch.node.remotestore.RemoteStoreNodeAttribute.REMOTE_STORE_REPOSITORY_TYPE_ATTRIBUTE_KEY_FORMAT;
 import static org.opensearch.node.remotestore.RemoteStoreNodeAttribute.REMOTE_STORE_ROUTING_TABLE_REPOSITORY_NAME_ATTRIBUTE_KEY;
-import static org.opensearch.node.remotestore.RemoteStoreNodeAttribute.isRemoteRoutingTableEnabled;
+import static org.opensearch.node.remotestore.RemoteStoreNodeAttribute.isRemoteRoutingTableConfigured;
 import static org.hamcrest.Matchers.anEmptyMap;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.is;
@@ -370,6 +370,8 @@ public void testWriteFullMetadataSuccessPublicationEnabled() throws IOException
         // TODO Make the publication flag parameterized
         publicationEnabled = true;
         settings = Settings.builder().put(settings).put(REMOTE_PUBLICATION_SETTING_KEY, publicationEnabled).build();
+        clusterSettings = new ClusterSettings(settings, ClusterSettings.BUILT_IN_CLUSTER_SETTINGS);
+        when(clusterService.getClusterSettings()).thenReturn(clusterSettings);
         remoteClusterStateService = new RemoteClusterStateService(
             "test-node-id",
             repositoriesServiceSupplier,
@@ -388,6 +390,7 @@ public void testWriteFullMetadataSuccessPublicationEnabled() throws IOException
             ),
             writableRegistry()
         );
+        assertTrue(remoteClusterStateService.isRemotePublicationEnabled());
         final ClusterState clusterState = generateClusterStateWithOneIndex().nodes(nodesWithLocalNodeClusterManager())
             .customs(
                 Map.of(
@@ -747,6 +750,8 @@ public void testWriteIncrementalMetadataSuccess() throws IOException {
     public void testWriteIncrementalMetadataSuccessWhenPublicationEnabled() throws IOException {
         publicationEnabled = true;
         settings = Settings.builder().put(settings).put(REMOTE_PUBLICATION_SETTING_KEY, true).build();
+        clusterSettings = new ClusterSettings(settings, ClusterSettings.BUILT_IN_CLUSTER_SETTINGS);
+        when(clusterService.getClusterSettings()).thenReturn(clusterSettings);
         remoteClusterStateService = new RemoteClusterStateService(
             "test-node-id",
             repositoriesServiceSupplier,
@@ -765,6 +770,7 @@ public void testWriteIncrementalMetadataSuccessWhenPublicationEnabled() throws I
             ),
             writableRegistry()
         );
+        assertTrue(remoteClusterStateService.isRemotePublicationEnabled());
         final ClusterState clusterState = generateClusterStateWithOneIndex().nodes(nodesWithLocalNodeClusterManager()).build();
         mockBlobStoreObjects();
         final CoordinationMetadata coordinationMetadata = CoordinationMetadata.builder().term(1L).build();
@@ -2749,7 +2755,7 @@ public void testRemoteStateUploadStats() throws IOException {
     }
 
     public void testRemoteRoutingTableNotInitializedWhenDisabled() {
-        if (isRemoteRoutingTableEnabled(settings)) {
+        if (isRemoteRoutingTableConfigured(settings)) {
             assertTrue(remoteClusterStateService.getRemoteRoutingTableService() instanceof InternalRemoteRoutingTableService);
         } else {
             assertTrue(remoteClusterStateService.getRemoteRoutingTableService() instanceof NoopRemoteRoutingTableService);