Delete stale index routing files.

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

@@ -10,6 +10,7 @@
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.message.ParameterizedMessage;
 import org.apache.lucene.store.IndexInput;
 import org.opensearch.action.LatchedActionListener;
 import org.opensearch.cluster.ClusterState;
@@ -297,4 +298,15 @@ protected void doStart() {
     @Override
     protected void doStop() {}
 
+    @Override
+    public void deleteStaleIndexRoutingPaths(List<String> stalePaths) throws IOException {
+        try {
+            logger.debug(() -> "Deleting stale index routing files from remote - " + stalePaths);
+            blobStoreRepository.blobStore().blobContainer(BlobPath.cleanPath()).deleteBlobsIgnoringIfNotExists(stalePaths);
+        } catch (IOException e) {
+            logger.error(() -> new ParameterizedMessage("Failed to delete some stale index routing paths from {}", stalePaths), e);
+            throw e;
+        }
+    }
+
 }

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

@@ -74,4 +74,9 @@
     protected void doClose() throws IOException {
         // noop
     }
+
+    @Override
+    public void deleteStaleIndexRoutingPaths(List<String> stalePaths) throws IOException {
+        // noop
+    }
 }

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

@@ -61,4 +61,6 @@ List<ClusterMetadataManifest.UploadedIndexMetadata> getAllUploadedIndicesRouting
         List<String> indicesRoutingToDelete
     );
 
+    public void deleteStaleIndexRoutingPaths(List<String> stalePaths) throws IOException;
+
 }

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

@@ -13,6 +13,7 @@
 import org.apache.logging.log4j.message.ParameterizedMessage;
 import org.apache.logging.log4j.util.Strings;
 import org.opensearch.cluster.ClusterState;
+import org.opensearch.cluster.routing.remote.RemoteRoutingTableService;
 import org.opensearch.cluster.service.ClusterApplierService;
 import org.opensearch.cluster.service.ClusterService;
 import org.opensearch.common.blobstore.BlobMetadata;
@@ -72,8 +73,13 @@
     private final ThreadPool threadpool;
     private final ClusterApplierService clusterApplierService;
     private RemoteManifestManager remoteManifestManager;
+    private final RemoteRoutingTableService remoteRoutingTableService;
 
-    public RemoteClusterStateCleanupManager(RemoteClusterStateService remoteClusterStateService, ClusterService clusterService) {
+    public RemoteClusterStateCleanupManager(
+        RemoteClusterStateService remoteClusterStateService,
+        ClusterService clusterService,
+        RemoteRoutingTableService remoteRoutingTableService
+    ) {
         this.remoteClusterStateService = remoteClusterStateService;
         this.remoteStateStats = remoteClusterStateService.getStats();
         ClusterSettings clusterSettings = clusterService.getClusterSettings();
@@ -83,6 +89,7 @@
         // initialize with 0, a cleanup will be done when this node is elected master node and version is incremented more than threshold
         this.lastCleanupAttemptStateVersion = 0;
         clusterSettings.addSettingsUpdateConsumer(REMOTE_CLUSTER_STATE_CLEANUP_INTERVAL_SETTING, this::updateCleanupInterval);
+        this.remoteRoutingTableService = remoteRoutingTableService;
     }
 
     void start() {
@@ -170,6 +177,7 @@
             Set<String> staleManifestPaths = new HashSet<>();
             Set<String> staleIndexMetadataPaths = new HashSet<>();
             Set<String> staleGlobalMetadataPaths = new HashSet<>();
+            Set<String> staleIndexRoutingPaths = new HashSet<>();
             activeManifestBlobMetadata.forEach(blobMetadata -> {
                 ClusterMetadataManifest clusterMetadataManifest = remoteManifestManager.fetchRemoteClusterMetadataManifest(
                     clusterName,
@@ -192,6 +200,10 @@
                         .values()
                         .forEach(attribute -> filesToKeep.add(attribute.getUploadedFilename()));
                 }
+                if (clusterMetadataManifest.getIndicesRouting() != null) {
+                    clusterMetadataManifest.getIndicesRouting()
+                        .forEach(uploadedIndicesRouting -> filesToKeep.add(uploadedIndicesRouting.getUploadedFilename()));
+                }
             });
             staleManifestBlobMetadata.forEach(blobMetadata -> {
                 ClusterMetadataManifest clusterMetadataManifest = remoteManifestManager.fetchRemoteClusterMetadataManifest(
@@ -221,6 +233,19 @@
                         .filter(file -> filesToKeep.contains(file) == false)
                         .forEach(staleGlobalMetadataPaths::add);
                 }
+                if (clusterMetadataManifest.getIndicesRouting() != null) {
+                    clusterMetadataManifest.getIndicesRouting().forEach(uploadedIndicesRouting -> {
+                        if (!filesToKeep.contains(uploadedIndicesRouting.getUploadedFilename())) {
+                            staleIndexRoutingPaths.add(uploadedIndicesRouting.getUploadedFilename());
+                            logger.debug(
+                                () -> new ParameterizedMessage(
+                                    "Indices routing paths in stale manifest: {}",
+                                    uploadedIndicesRouting.getUploadedFilename()
+                                )
+                            );
+                        }
+                    });
+                }
 
                 clusterMetadataManifest.getIndices().forEach(uploadedIndexMetadata -> {
                     String fileName = RemoteClusterStateUtils.getFormattedIndexFileName(uploadedIndexMetadata.getUploadedFilename());
@@ -238,6 +263,15 @@
             deleteStalePaths(new ArrayList<>(staleGlobalMetadataPaths));
             deleteStalePaths(new ArrayList<>(staleIndexMetadataPaths));
             deleteStalePaths(new ArrayList<>(staleManifestPaths));
+            try {
+                remoteRoutingTableService.deleteStaleIndexRoutingPaths(new ArrayList<>(staleIndexRoutingPaths));
+            } catch (IOException e) {
+                logger.error(
+                    () -> new ParameterizedMessage("Error while deleting stale index routing files {}", staleIndexRoutingPaths),
+                    e
+                );
+                remoteStateStats.indexRoutingFilesCleanupAttemptFailed();
+            }
         } catch (IllegalStateException e) {
             logger.error("Error while fetching Remote Cluster Metadata manifests", e);
         } catch (IOException e) {

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

@@ -150,9 +150,9 @@ public RemoteClusterStateService(
         this.slowWriteLoggingThreshold = clusterSettings.get(SLOW_WRITE_LOGGING_THRESHOLD);
         clusterSettings.addSettingsUpdateConsumer(SLOW_WRITE_LOGGING_THRESHOLD, this::setSlowWriteLoggingThreshold);
         this.remoteStateStats = new RemotePersistenceStats();
-        this.remoteClusterStateCleanupManager = new RemoteClusterStateCleanupManager(this, clusterService);
         this.indexMetadataUploadListeners = indexMetadataUploadListeners;
         this.remoteRoutingTableService = RemoteRoutingTableServiceFactory.getService(repositoriesService, settings, clusterSettings);
+        this.remoteClusterStateCleanupManager = new RemoteClusterStateCleanupManager(this, clusterService, remoteRoutingTableService);
     }
 
     /**

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

@@ -19,12 +19,16 @@
  */
 public class RemotePersistenceStats extends PersistedStateStats {
     static final String CLEANUP_ATTEMPT_FAILED_COUNT = "cleanup_attempt_failed_count";
+    static final String INDEX_ROUTING_FILES_CLEANUP_ATTEMPT_FAILED_COUNT = "index_routing_files_cleanup_attempt_failed_count";
     static final String REMOTE_UPLOAD = "remote_upload";
     private AtomicLong cleanupAttemptFailedCount = new AtomicLong(0);
 
+    private AtomicLong indexRoutingFilesCleanupAttemptFailedCount = new AtomicLong(0);
+
     public RemotePersistenceStats() {
         super(REMOTE_UPLOAD);
         addToExtendedFields(CLEANUP_ATTEMPT_FAILED_COUNT, cleanupAttemptFailedCount);
+        addToExtendedFields(INDEX_ROUTING_FILES_CLEANUP_ATTEMPT_FAILED_COUNT, indexRoutingFilesCleanupAttemptFailedCount);
     }
 
     public void cleanUpAttemptFailed() {
@@ -34,4 +38,12 @@ public void cleanUpAttemptFailed() {
     public long getCleanupAttemptFailedCount() {
         return cleanupAttemptFailedCount.get();
     }
+
+    public void indexRoutingFilesCleanupAttemptFailed() {
+        indexRoutingFilesCleanupAttemptFailedCount.incrementAndGet();
+    }
+
+    public long getIndexRoutingFilesCleanupAttemptFailedCount() {
+        return indexRoutingFilesCleanupAttemptFailedCount.get();
+    }
 }

server/src/test/java/org/opensearch/cluster/routing/remote/RemoteRoutingTableServiceTests.java

@@ -47,12 +47,14 @@
 import org.junit.Before;
 
 import java.io.IOException;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.function.Supplier;
 
 import org.mockito.ArgumentCaptor;
+import org.mockito.Mockito;
 
 import static org.opensearch.cluster.routing.remote.InternalRemoteRoutingTableService.INDEX_ROUTING_FILE_PREFIX;
 import static org.opensearch.cluster.routing.remote.InternalRemoteRoutingTableService.INDEX_ROUTING_PATH_TOKEN;
@@ -65,6 +67,7 @@
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.ArgumentMatchers.startsWith;
 import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.doNothing;
 import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.times;
@@ -91,14 +94,12 @@ public void setup() {
             .put("node.attr." + REMOTE_STORE_ROUTING_TABLE_REPOSITORY_NAME_ATTRIBUTE_KEY, "routing_repository")
             .put(FsRepository.REPOSITORIES_COMPRESS_SETTING.getKey(), false)
             .build();
-
         blobStoreRepository = mock(BlobStoreRepository.class);
         when(blobStoreRepository.getCompressor()).thenReturn(new DeflateCompressor());
         blobStore = mock(BlobStore.class);
         blobContainer = mock(BlobContainer.class);
         when(repositoriesService.repository("routing_repository")).thenReturn(blobStoreRepository);
         when(blobStoreRepository.blobStore()).thenReturn(blobStore);
-
         Settings nodeSettings = Settings.builder().put(REMOTE_PUBLICATION_EXPERIMENTAL, "true").build();
         FeatureFlags.initializeFeatureFlags(nodeSettings);
 
@@ -552,4 +553,28 @@ private BlobPath getPath() {
             RemoteStoreEnums.PathHashAlgorithm.FNV_1A_BASE64
         );
     }
+
+    public void testDeleteStaleIndexRoutingPaths() throws IOException {
+        doNothing().when(blobContainer).deleteBlobsIgnoringIfNotExists(any());
+        when(blobStore.blobContainer(any())).thenReturn(blobContainer);
+        List<String> stalePaths = Arrays.asList("path1", "path2");
+        remoteRoutingTableService.doStart();
+        remoteRoutingTableService.deleteStaleIndexRoutingPaths(stalePaths);
+        verify(blobContainer).deleteBlobsIgnoringIfNotExists(stalePaths);
+    }
+
+    public void testDeleteStaleIndexRoutingPathsThrowsIOException() throws IOException {
+        when(blobStore.blobContainer(any())).thenReturn(blobContainer);
+        List<String> stalePaths = Arrays.asList("path1", "path2");
+        // Simulate an IOException
+        doThrow(new IOException("test exception")).when(blobContainer).deleteBlobsIgnoringIfNotExists(Mockito.anyList());
+
+        remoteRoutingTableService.doStart();
+        IOException thrown = assertThrows(IOException.class, () -> {
+            remoteRoutingTableService.deleteStaleIndexRoutingPaths(stalePaths);
+        });
+        assertEquals("test exception", thrown.getMessage());
+        verify(blobContainer).deleteBlobsIgnoringIfNotExists(stalePaths);
+    }
+
 }