Add dedicated string prefix for remote index metadata and remote rout…

…ing table (#15575) (#15740)

* Hashed prefix for index metadata

Signed-off-by: Sooraj Sinha <soosinha@amazon.com>
(cherry picked from commit 1935650)

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

@@ -17,7 +17,11 @@
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.util.FeatureFlags;
 import org.opensearch.discovery.DiscoveryStats;
+import org.opensearch.gateway.remote.ClusterMetadataManifest.UploadedIndexMetadata;
 import org.opensearch.gateway.remote.model.RemoteClusterMetadataManifest;
+import org.opensearch.gateway.remote.model.RemoteRoutingTableBlobStore;
+import org.opensearch.index.remote.RemoteStoreEnums.PathHashAlgorithm;
+import org.opensearch.index.remote.RemoteStoreEnums.PathType;
 import org.opensearch.indices.recovery.RecoverySettings;
 import org.opensearch.remotestore.RemoteStoreBaseIntegTestCase;
 import org.opensearch.repositories.RepositoriesService;
@@ -48,19 +52,27 @@
 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.test.hamcrest.OpenSearchAssertions.assertAcked;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.startsWith;
 
 @ClusterScope(scope = Scope.TEST, numDataNodes = 0)
 public class RemoteStatePublicationIT extends RemoteStoreBaseIntegTestCase {
 
-    private static String INDEX_NAME = "test-index";
+    private static final String INDEX_NAME = "test-index";
+    private static final String REMOTE_STATE_PREFIX = "!";
+    private static final String REMOTE_ROUTING_PREFIX = "_";
     private boolean isRemoteStateEnabled = true;
     private String isRemotePublicationEnabled = "true";
+    private boolean hasRemoteStateCharPrefix;
+    private boolean hasRemoteRoutingCharPrefix;
 
     @Before
     public void setup() {
         asyncUploadMockFsRepo = false;
         isRemoteStateEnabled = true;
         isRemotePublicationEnabled = "true";
+        hasRemoteStateCharPrefix = randomBoolean();
+        hasRemoteRoutingCharPrefix = randomBoolean();
     }
 
     @Override
@@ -84,6 +96,7 @@ protected Settings nodeSettings(int nodeOrdinal) {
             "node.attr." + REMOTE_STORE_REPOSITORY_SETTINGS_ATTRIBUTE_KEY_PREFIX,
             routingTableRepoName
         );
+
         return Settings.builder()
             .put(super.nodeSettings(nodeOrdinal))
             .put(REMOTE_CLUSTER_STATE_ENABLED_SETTING.getKey(), isRemoteStateEnabled)
@@ -94,6 +107,19 @@ protected Settings nodeSettings(int nodeOrdinal) {
                 RemoteClusterStateService.REMOTE_CLUSTER_STATE_CHECKSUM_VALIDATION_MODE_SETTING.getKey(),
                 RemoteClusterStateService.RemoteClusterStateValidationMode.FAILURE
             )
+            .put(
+                RemoteClusterStateService.CLUSTER_REMOTE_STORE_STATE_PATH_PREFIX.getKey(),
+                hasRemoteStateCharPrefix ? REMOTE_STATE_PREFIX : ""
+            )
+            .put(
+                RemoteRoutingTableBlobStore.CLUSTER_REMOTE_STORE_ROUTING_TABLE_PATH_PREFIX.getKey(),
+                hasRemoteRoutingCharPrefix ? REMOTE_ROUTING_PREFIX : ""
+            )
+            .put(RemoteIndexMetadataManager.REMOTE_INDEX_METADATA_PATH_TYPE_SETTING.getKey(), PathType.HASHED_PREFIX.toString())
+            .put(
+                RemoteIndexMetadataManager.REMOTE_INDEX_METADATA_PATH_HASH_ALGO_SETTING.getKey(),
+                PathHashAlgorithm.FNV_1A_COMPOSITE_1.toString()
+            )
             .build();
     }
 
@@ -137,6 +163,27 @@ public void testPublication() throws Exception {
         Map<String, Integer> manifestFiles = getMetadataFiles(repository, RemoteClusterMetadataManifest.MANIFEST);
         assertTrue(manifestFiles.containsKey(RemoteClusterMetadataManifest.MANIFEST));
 
+        RemoteClusterStateService remoteClusterStateService = internalCluster().getInstance(
+            RemoteClusterStateService.class,
+            internalCluster().getClusterManagerName()
+        );
+        ClusterMetadataManifest manifest = remoteClusterStateService.getLatestClusterMetadataManifest(
+            getClusterState().getClusterName().value(),
+            getClusterState().metadata().clusterUUID()
+        ).get();
+        assertThat(manifest.getIndices().size(), is(1));
+        if (hasRemoteStateCharPrefix) {
+            for (UploadedIndexMetadata md : manifest.getIndices()) {
+                assertThat(md.getUploadedFilename(), startsWith(REMOTE_STATE_PREFIX));
+            }
+        }
+        assertThat(manifest.getIndicesRouting().size(), is(1));
+        if (hasRemoteRoutingCharPrefix) {
+            for (UploadedIndexMetadata md : manifest.getIndicesRouting()) {
+                assertThat(md.getUploadedFilename(), startsWith(REMOTE_ROUTING_PREFIX));
+            }
+        }
+
         // get settings from each node and verify that it is updated
         Settings settings = clusterService().getSettings();
         logger.info("settings : {}", settings);

server/src/internalClusterTest/java/org/opensearch/remotestore/RemoteStoreClusterStateRestoreIT.java

@@ -328,10 +328,17 @@ public void testFullClusterRestoreManifestFilePointsToInvalidIndexMetadataPathTh
         internalCluster().stopAllNodes();
         // Step - 3 Delete index metadata file in remote
         try {
-            Files.move(
-                segmentRepoPath.resolve(encodeString(clusterName) + "/cluster-state/" + prevClusterUUID + "/index"),
-                segmentRepoPath.resolve("cluster-state/")
+            RemoteClusterStateService remoteClusterStateService = internalCluster().getInstance(
+                RemoteClusterStateService.class,
+                internalCluster().getClusterManagerName()
             );
+            ClusterMetadataManifest manifest = remoteClusterStateService.getLatestClusterMetadataManifest(
+                getClusterState().getClusterName().value(),
+                getClusterState().metadata().clusterUUID()
+            ).get();
+            for (UploadedIndexMetadata md : manifest.getIndices()) {
+                Files.move(segmentRepoPath.resolve(md.getUploadedFilename()), segmentRepoPath.resolve("cluster-state/"));
+            }
         } catch (IOException e) {
             throw new RuntimeException(e);
         }

server/src/main/java/org/opensearch/common/remote/RemoteWriteableBlobEntity.java

@@ -63,6 +63,17 @@ public String[] getBlobPathTokens() {
 
     public abstract String generateBlobFileName();
 
+    /**
+     * Generate the blob path for the remote entity by adding a custom prefix.
+     * This custom prefix may be generated by any of the strategies defined in {@link org.opensearch.index.remote.RemoteStoreEnums}
+     * The default implementation returns the same path as passed in the argument.
+     * @param blobPath The remote path on which the remote entity is to be uploaded
+     * @return The modified remote path after adding a custom prefix at which the remote entity will be uploaded.
+     */
+    public BlobPath getPrefixedPath(BlobPath blobPath) {
+        return blobPath;
+    }
+
     public String clusterUUID() {
         return clusterUUID;
     }

server/src/main/java/org/opensearch/common/remote/RemoteWriteableEntityBlobStore.java

@@ -102,7 +102,7 @@ public BlobPath getBlobPathForUpload(final RemoteWriteableBlobEntity<T> obj) {
         for (String token : obj.getBlobPathParameters().getPathTokens()) {
             blobPath = blobPath.add(token);
         }
-        return blobPath;
+        return obj.getPrefixedPath(blobPath);
     }
 
     public BlobPath getBlobPathForDownload(final RemoteWriteableBlobEntity<T> obj) {

server/src/main/java/org/opensearch/common/settings/ClusterSettings.java

@@ -109,6 +109,7 @@
 import org.opensearch.gateway.ShardsBatchGatewayAllocator;
 import org.opensearch.gateway.remote.RemoteClusterStateCleanupManager;
 import org.opensearch.gateway.remote.RemoteClusterStateService;
+import org.opensearch.gateway.remote.RemoteIndexMetadataManager;
 import org.opensearch.gateway.remote.model.RemoteRoutingTableBlobStore;
 import org.opensearch.http.HttpTransportSettings;
 import org.opensearch.index.IndexModule;
@@ -738,6 +739,9 @@ public void apply(Settings value, Settings current, Settings previous) {
                 GLOBAL_METADATA_UPLOAD_TIMEOUT_SETTING,
                 METADATA_MANIFEST_UPLOAD_TIMEOUT_SETTING,
                 RemoteClusterStateService.REMOTE_STATE_READ_TIMEOUT_SETTING,
+                RemoteClusterStateService.CLUSTER_REMOTE_STORE_STATE_PATH_PREFIX,
+                RemoteIndexMetadataManager.REMOTE_INDEX_METADATA_PATH_TYPE_SETTING,
+                RemoteIndexMetadataManager.REMOTE_INDEX_METADATA_PATH_HASH_ALGO_SETTING,
                 RemoteStoreNodeService.REMOTE_STORE_COMPATIBILITY_MODE_SETTING,
                 RemoteStoreNodeService.MIGRATION_DIRECTION_SETTING,
 
@@ -746,6 +750,7 @@ public void apply(Settings value, Settings current, Settings previous) {
                 RemoteRoutingTableBlobStore.REMOTE_ROUTING_TABLE_PATH_TYPE_SETTING,
                 RemoteRoutingTableBlobStore.REMOTE_ROUTING_TABLE_PATH_HASH_ALGO_SETTING,
                 RemoteClusterStateService.REMOTE_CLUSTER_STATE_CHECKSUM_VALIDATION_MODE_SETTING,
+                RemoteRoutingTableBlobStore.CLUSTER_REMOTE_STORE_ROUTING_TABLE_PATH_PREFIX,
 
                 AdmissionControlSettings.ADMISSION_CONTROL_TRANSPORT_LAYER_MODE,
                 CpuBasedAdmissionControllerSettings.CPU_BASED_ADMISSION_CONTROLLER_TRANSPORT_LAYER_MODE,

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

@@ -150,6 +150,16 @@ public class RemoteClusterStateService implements Closeable {
         Setting.Property.NodeScope
     );
 
+    /**
+    * Controls the fixed prefix for the cluster state path on remote store.
+     */
+    public static final Setting<String> CLUSTER_REMOTE_STORE_STATE_PATH_PREFIX = Setting.simpleString(
+        "cluster.remote_store.state.path.prefix",
+        "",
+        Property.NodeScope,
+        Property.Final
+    );
+
     /**
      * Validation mode for cluster state checksum.
      *  None: Validation will be disabled.
@@ -211,6 +221,7 @@ public static RemoteClusterStateValidationMode parseString(String mode) {
         + "indices, coordination metadata updated : [{}], settings metadata updated : [{}], templates metadata "
         + "updated : [{}], custom metadata updated : [{}], indices routing updated : [{}]";
     private final boolean isPublicationEnabled;
+    private final String remotePathPrefix;
 
     // ToXContent Params with gateway mode.
     // We are using gateway context mode to persist all custom metadata.
@@ -252,6 +263,7 @@ public RemoteClusterStateService(
         this.isPublicationEnabled = FeatureFlags.isEnabled(REMOTE_PUBLICATION_EXPERIMENTAL)
             && RemoteStoreNodeAttribute.isRemoteStoreClusterStateEnabled(settings)
             && RemoteStoreNodeAttribute.isRemoteRoutingTableEnabled(settings);
+        this.remotePathPrefix = CLUSTER_REMOTE_STORE_STATE_PATH_PREFIX.get(settings);
         this.remoteRoutingTableService = RemoteRoutingTableServiceFactory.getService(
             repositoriesService,
             settings,
@@ -728,7 +740,10 @@ UploadedMetadataResults writeMetadataInParallel(
                     indexMetadata,
                     clusterState.metadata().clusterUUID(),
                     blobStoreRepository.getCompressor(),
-                    blobStoreRepository.getNamedXContentRegistry()
+                    blobStoreRepository.getNamedXContentRegistry(),
+                    remoteIndexMetadataManager.getPathTypeSetting(),
+                    remoteIndexMetadataManager.getPathHashAlgoSetting(),
+                    remotePathPrefix
                 ),
                 listener
             );

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

@@ -20,6 +20,7 @@
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.gateway.remote.model.RemoteIndexMetadata;
 import org.opensearch.gateway.remote.model.RemoteReadResult;
+import org.opensearch.index.remote.RemoteStoreEnums;
 import org.opensearch.index.translog.transfer.BlobStoreTransferService;
 import org.opensearch.repositories.blobstore.BlobStoreRepository;
 import org.opensearch.threadpool.ThreadPool;
@@ -44,11 +45,38 @@ public class RemoteIndexMetadataManager extends AbstractRemoteWritableEntityMana
         Setting.Property.Deprecated
     );
 
+    /**
+     * This setting is used to set the remote index metadata blob store path type strategy.
+     */
+    public static final Setting<RemoteStoreEnums.PathType> REMOTE_INDEX_METADATA_PATH_TYPE_SETTING = new Setting<>(
+        "cluster.remote_store.index_metadata.path_type",
+        RemoteStoreEnums.PathType.HASHED_PREFIX.toString(),
+        RemoteStoreEnums.PathType::parseString,
+        Setting.Property.NodeScope,
+        Setting.Property.Dynamic
+    );
+
+    /**
+     * This setting is used to set the remote index metadata blob store path hash algorithm strategy.
+     * This setting will come to effect if the {@link #REMOTE_INDEX_METADATA_PATH_TYPE_SETTING}
+     * is either {@code HASHED_PREFIX} or {@code HASHED_INFIX}.
+     */
+    public static final Setting<RemoteStoreEnums.PathHashAlgorithm> REMOTE_INDEX_METADATA_PATH_HASH_ALGO_SETTING = new Setting<>(
+        "cluster.remote_store.index_metadata.path_hash_algo",
+        RemoteStoreEnums.PathHashAlgorithm.FNV_1A_BASE64.toString(),
+        RemoteStoreEnums.PathHashAlgorithm::parseString,
+        Setting.Property.NodeScope,
+        Setting.Property.Dynamic
+    );
+
     private final Compressor compressor;
     private final NamedXContentRegistry namedXContentRegistry;
 
     private volatile TimeValue indexMetadataUploadTimeout;
 
+    private RemoteStoreEnums.PathType pathType;
+    private RemoteStoreEnums.PathHashAlgorithm pathHashAlgo;
+
     public RemoteIndexMetadataManager(
         ClusterSettings clusterSettings,
         String clusterName,
@@ -70,7 +98,11 @@ public RemoteIndexMetadataManager(
         this.namedXContentRegistry = blobStoreRepository.getNamedXContentRegistry();
         this.compressor = blobStoreRepository.getCompressor();
         this.indexMetadataUploadTimeout = clusterSettings.get(INDEX_METADATA_UPLOAD_TIMEOUT_SETTING);
+        this.pathType = clusterSettings.get(REMOTE_INDEX_METADATA_PATH_TYPE_SETTING);
+        this.pathHashAlgo = clusterSettings.get(REMOTE_INDEX_METADATA_PATH_HASH_ALGO_SETTING);
         clusterSettings.addSettingsUpdateConsumer(INDEX_METADATA_UPLOAD_TIMEOUT_SETTING, this::setIndexMetadataUploadTimeout);
+        clusterSettings.addSettingsUpdateConsumer(REMOTE_INDEX_METADATA_PATH_TYPE_SETTING, this::setPathTypeSetting);
+        clusterSettings.addSettingsUpdateConsumer(REMOTE_INDEX_METADATA_PATH_HASH_ALGO_SETTING, this::setPathHashAlgoSetting);
     }
 
     /**
@@ -127,4 +159,20 @@ protected ActionListener<Object> getWrappedReadListener(
             ex -> listener.onFailure(new RemoteStateTransferException("Download failed for " + component, remoteEntity, ex))
         );
     }
+
+    private void setPathTypeSetting(RemoteStoreEnums.PathType pathType) {
+        this.pathType = pathType;
+    }
+
+    private void setPathHashAlgoSetting(RemoteStoreEnums.PathHashAlgorithm pathHashAlgo) {
+        this.pathHashAlgo = pathHashAlgo;
+    }
+
+    protected RemoteStoreEnums.PathType getPathTypeSetting() {
+        return pathType;
+    }
+
+    protected RemoteStoreEnums.PathHashAlgorithm getPathHashAlgoSetting() {
+        return pathHashAlgo;
+    }
 }

server/src/main/java/org/opensearch/gateway/remote/model/RemoteIndexMetadata.java

@@ -9,6 +9,7 @@
 package org.opensearch.gateway.remote.model;
 
 import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.common.blobstore.BlobPath;
 import org.opensearch.common.io.Streams;
 import org.opensearch.common.remote.AbstractClusterMetadataWriteableBlobEntity;
 import org.opensearch.common.remote.BlobPathParameters;
@@ -17,6 +18,8 @@
 import org.opensearch.gateway.remote.ClusterMetadataManifest.UploadedIndexMetadata;
 import org.opensearch.gateway.remote.ClusterMetadataManifest.UploadedMetadata;
 import org.opensearch.gateway.remote.RemoteClusterStateUtils;
+import org.opensearch.index.remote.RemoteStoreEnums;
+import org.opensearch.index.remote.RemoteStorePathStrategy;
 import org.opensearch.index.remote.RemoteStoreUtils;
 import org.opensearch.repositories.blobstore.ChecksumBlobStoreFormat;
 
@@ -41,15 +44,24 @@ public class RemoteIndexMetadata extends AbstractClusterMetadataWriteableBlobEnt
     public static final String INDEX = "index";
 
     private IndexMetadata indexMetadata;
+    private RemoteStoreEnums.PathType pathType;
+    private RemoteStoreEnums.PathHashAlgorithm pathHashAlgo;
+    private String fixedPrefix;
 
     public RemoteIndexMetadata(
         final IndexMetadata indexMetadata,
         final String clusterUUID,
         final Compressor compressor,
-        final NamedXContentRegistry namedXContentRegistry
+        final NamedXContentRegistry namedXContentRegistry,
+        final RemoteStoreEnums.PathType pathType,
+        final RemoteStoreEnums.PathHashAlgorithm pathHashAlgo,
+        final String fixedPrefix
     ) {
         super(clusterUUID, compressor, namedXContentRegistry);
         this.indexMetadata = indexMetadata;
+        this.pathType = pathType;
+        this.pathHashAlgo = pathHashAlgo;
+        this.fixedPrefix = fixedPrefix;
     }
 
     public RemoteIndexMetadata(
@@ -86,6 +98,22 @@ public String generateBlobFileName() {
         return blobFileName;
     }
 
+    @Override
+    public BlobPath getPrefixedPath(BlobPath blobPath) {
+        if (pathType == null) {
+            return blobPath;
+        }
+        assert pathHashAlgo != null;
+        return pathType.path(
+            RemoteStorePathStrategy.BasePathInput.builder()
+                .fixedPrefix(fixedPrefix)
+                .basePath(blobPath)
+                .indexUUID(indexMetadata.getIndexUUID())
+                .build(),
+            pathHashAlgo
+        );
+    }
+
     @Override
     public UploadedMetadata getUploadedMetadata() {
         assert blobName != null;