[Snapshot Interop] Add Logic in Lock Manager to cleanup stale data po…

…st index deletion. (opensearch-project#8472)

Signed-off-by: Harish Bhakuni <hbhakuni@amazon.com>
(cherry picked from commit 5670d2a)

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

@@ -240,7 +240,7 @@ public void teardown() {
         assertAcked(clusterAdmin().prepareDeleteRepository(REPOSITORY_2_NAME));
     }
 
-    public int getFileCount(Path path) throws Exception {
+    public static int getFileCount(Path path) throws Exception {
         final AtomicInteger filesExisting = new AtomicInteger(0);
         Files.walkFileTree(path, new SimpleFileVisitor<>() {
             @Override

server/src/internalClusterTest/java/org/opensearch/snapshots/DeleteSnapshotIT.java

@@ -9,23 +9,29 @@
 package org.opensearch.snapshots;
 
 import org.opensearch.action.admin.cluster.snapshots.create.CreateSnapshotResponse;
+import org.opensearch.action.support.master.AcknowledgedResponse;
 import org.opensearch.client.Client;
+import org.opensearch.cluster.metadata.IndexMetadata;
 import org.opensearch.common.UUIDs;
 import org.opensearch.common.action.ActionFuture;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.unit.TimeValue;
 import org.opensearch.common.util.FeatureFlags;
+import org.opensearch.remotestore.RemoteStoreBaseIntegTestCase;
 import org.opensearch.test.FeatureFlagSetter;
 import org.opensearch.test.OpenSearchIntegTestCase;
 
 import java.nio.file.Path;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Locale;
+import java.util.concurrent.TimeUnit;
 import java.util.stream.Stream;
 
 import static org.opensearch.remotestore.RemoteStoreBaseIntegTestCase.remoteStoreClusterSettings;
 import static org.opensearch.test.hamcrest.OpenSearchAssertions.assertAcked;
+import static org.hamcrest.Matchers.comparesEqualTo;
 import static org.hamcrest.Matchers.is;
 
 @OpenSearchIntegTestCase.ClusterScope(scope = OpenSearchIntegTestCase.Scope.TEST, numDataNodes = 0)
@@ -240,12 +246,13 @@ public void testDeleteMultipleShallowCopySnapshotsCase3() throws Exception {
         final String snapshotRepoName = "snapshot-repo-name";
         final Path snapshotRepoPath = randomRepoPath();
         createRepository(snapshotRepoName, "mock", snapshotRepoSettingsForShallowCopy(snapshotRepoPath));
-        final String testIndex = "index-test";
-        createIndexWithContent(testIndex);
 
         final Path remoteStoreRepoPath = randomRepoPath();
         createRepository(REMOTE_REPO_NAME, "fs", remoteStoreRepoPath);
 
+        final String testIndex = "index-test";
+        createIndexWithContent(testIndex);
+
         final String remoteStoreEnabledIndexName = "remote-index-1";
         final Settings remoteStoreEnabledIndexSettings = getRemoteStoreBackedIndexSettings();
         createIndex(remoteStoreEnabledIndexName, remoteStoreEnabledIndexSettings);
@@ -289,6 +296,71 @@ public void testDeleteMultipleShallowCopySnapshotsCase3() throws Exception {
         assert (getLockFilesInRemoteStore(remoteStoreEnabledIndexName, REMOTE_REPO_NAME).length == 0);
     }
 
+    public void testRemoteStoreCleanupForDeletedIndex() throws Exception {
+        disableRepoConsistencyCheck("Remote store repository is being used in the test");
+        FeatureFlagSetter.set(FeatureFlags.REMOTE_STORE);
+
+        internalCluster().startClusterManagerOnlyNode(remoteStoreClusterSettings(REMOTE_REPO_NAME));
+        internalCluster().startDataOnlyNode();
+        final Client clusterManagerClient = internalCluster().clusterManagerClient();
+        ensureStableCluster(2);
+
+        final String snapshotRepoName = "snapshot-repo-name";
+        final Path snapshotRepoPath = randomRepoPath();
+        createRepository(snapshotRepoName, "mock", snapshotRepoSettingsForShallowCopy(snapshotRepoPath));
+
+        final Path remoteStoreRepoPath = randomRepoPath();
+        createRepository(REMOTE_REPO_NAME, "fs", remoteStoreRepoPath);
+
+        final String testIndex = "index-test";
+        createIndexWithContent(testIndex);
+
+        final String remoteStoreEnabledIndexName = "remote-index-1";
+        final Settings remoteStoreEnabledIndexSettings = getRemoteStoreBackedIndexSettings();
+        createIndex(remoteStoreEnabledIndexName, remoteStoreEnabledIndexSettings);
+        indexRandomDocs(remoteStoreEnabledIndexName, randomIntBetween(5, 10));
+
+        String indexUUID = client().admin()
+            .indices()
+            .prepareGetSettings(remoteStoreEnabledIndexName)
+            .get()
+            .getSetting(remoteStoreEnabledIndexName, IndexMetadata.SETTING_INDEX_UUID);
+
+        logger.info("--> create two remote index shallow snapshots");
+        List<String> shallowCopySnapshots = createNSnapshots(snapshotRepoName, 2);
+
+        String[] lockFiles = getLockFilesInRemoteStore(remoteStoreEnabledIndexName, REMOTE_REPO_NAME);
+        assert (lockFiles.length == 2) : "lock files are " + Arrays.toString(lockFiles);
+
+        // delete remote store index
+        assertAcked(client().admin().indices().prepareDelete(remoteStoreEnabledIndexName));
+
+        logger.info("--> delete snapshot 1");
+        AcknowledgedResponse deleteSnapshotResponse = clusterManagerClient.admin()
+            .cluster()
+            .prepareDeleteSnapshot(snapshotRepoName, shallowCopySnapshots.get(0))
+            .get();
+        assertAcked(deleteSnapshotResponse);
+
+        lockFiles = getLockFilesInRemoteStore(remoteStoreEnabledIndexName, REMOTE_REPO_NAME, indexUUID);
+        assert (lockFiles.length == 1) : "lock files are " + Arrays.toString(lockFiles);
+
+        logger.info("--> delete snapshot 2");
+        deleteSnapshotResponse = clusterManagerClient.admin()
+            .cluster()
+            .prepareDeleteSnapshot(snapshotRepoName, shallowCopySnapshots.get(1))
+            .get();
+        assertAcked(deleteSnapshotResponse);
+
+        Path indexPath = Path.of(String.valueOf(remoteStoreRepoPath), indexUUID);
+        // Delete is async. Give time for it
+        assertBusy(() -> {
+            try {
+                assertThat(RemoteStoreBaseIntegTestCase.getFileCount(indexPath), comparesEqualTo(0));
+            } catch (Exception e) {}
+        }, 30, TimeUnit.SECONDS);
+    }
+
     private List<String> createNSnapshots(String repoName, int count) {
         final List<String> snapshotNames = new ArrayList<>(count);
         final String prefix = "snap-" + UUIDs.randomBase64UUID(random()).toLowerCase(Locale.ROOT) + "-";

server/src/main/java/org/opensearch/index/store/RemoteSegmentStoreDirectory.java

@@ -760,30 +760,37 @@ public void deleteStaleSegments(int lastNMetadataFilesToKeep) throws IOException
         }
     }
 
+    public void deleteStaleSegmentsAsync(int lastNMetadataFilesToKeep) {
+        deleteStaleSegmentsAsync(lastNMetadataFilesToKeep, ActionListener.wrap(r -> {}, e -> {}));
+    }
+
     /**
      * Delete stale segment and metadata files asynchronously.
      * This method calls {@link RemoteSegmentStoreDirectory#deleteStaleSegments(int)} in an async manner.
      *
      * @param lastNMetadataFilesToKeep number of metadata files to keep
      */
-    public void deleteStaleSegmentsAsync(int lastNMetadataFilesToKeep) {
+    public void deleteStaleSegmentsAsync(int lastNMetadataFilesToKeep, ActionListener<Void> listener) {
         if (canDeleteStaleCommits.compareAndSet(true, false)) {
             try {
                 threadPool.executor(ThreadPool.Names.REMOTE_PURGE).execute(() -> {
                     try {
                         deleteStaleSegments(lastNMetadataFilesToKeep);
+                        listener.onResponse(null);
                     } catch (Exception e) {
-                        logger.info(
+                        logger.error(
                             "Exception while deleting stale commits from remote segment store, will retry delete post next commit",
                             e
                         );
+                        listener.onFailure(e);
                     } finally {
                         canDeleteStaleCommits.set(true);
                     }
                 });
             } catch (Exception e) {
-                logger.info("Exception occurred while scheduling deleteStaleCommits", e);
+                logger.error("Exception occurred while scheduling deleteStaleCommits", e);
                 canDeleteStaleCommits.set(true);
+                listener.onFailure(e);
             }
         }
     }
@@ -815,7 +822,6 @@ private boolean deleteIfEmpty() throws IOException {
     }
 
     public void close() throws IOException {
-        deleteStaleSegmentsAsync(0);
-        deleteIfEmpty();
+        deleteStaleSegmentsAsync(0, ActionListener.wrap(r -> deleteIfEmpty(), e -> logger.error("Failed to cleanup remote directory")));
     }
 }

server/src/main/java/org/opensearch/index/store/lockmanager/RemoteStoreLockManagerFactory.java

@@ -33,7 +33,7 @@ public RemoteStoreLockManagerFactory(Supplier<RepositoriesService> repositoriesS
         this.repositoriesService = repositoriesService;
     }
 
-    public RemoteStoreMetadataLockManager newLockManager(String repositoryName, String indexUUID, String shardId) throws IOException {
+    public RemoteStoreLockManager newLockManager(String repositoryName, String indexUUID, String shardId) throws IOException {
         return newLockManager(repositoriesService.get(), repositoryName, indexUUID, shardId);
     }
 
@@ -58,6 +58,12 @@ public static RemoteStoreMetadataLockManager newLockManager(
         }
     }
 
+    // TODO: remove this once we add poller in place to trigger remote store cleanup
+    // see: https://github.com/opensearch-project/OpenSearch/issues/8469
+    public Supplier<RepositoriesService> getRepositoriesService() {
+        return repositoriesService;
+    }
+
     private static RemoteBufferedOutputDirectory createRemoteBufferedOutputDirectory(
         Repository repository,
         BlobPath commonBlobPath,

server/src/main/java/org/opensearch/repositories/blobstore/BlobStoreRepository.java

@@ -116,11 +116,12 @@
 import org.opensearch.index.snapshots.blobstore.RemoteStoreShardShallowCopySnapshot;
 import org.opensearch.index.snapshots.blobstore.SlicedInputStream;
 import org.opensearch.index.snapshots.blobstore.SnapshotFiles;
+import org.opensearch.index.store.RemoteSegmentStoreDirectoryFactory;
 import org.opensearch.index.store.Store;
 import org.opensearch.index.store.StoreFileMetadata;
 import org.opensearch.index.store.lockmanager.FileLockInfo;
+import org.opensearch.index.store.lockmanager.RemoteStoreLockManager;
 import org.opensearch.index.store.lockmanager.RemoteStoreLockManagerFactory;
-import org.opensearch.index.store.lockmanager.RemoteStoreMetadataLockManager;
 import org.opensearch.indices.recovery.RecoverySettings;
 import org.opensearch.indices.recovery.RecoveryState;
 import org.opensearch.repositories.IndexId;
@@ -633,7 +634,7 @@ public void cloneRemoteStoreIndexShardSnapshot(
             RemoteStoreShardShallowCopySnapshot remStoreBasedShardMetadata = (RemoteStoreShardShallowCopySnapshot) indexShardSnapshot;
             String indexUUID = remStoreBasedShardMetadata.getIndexUUID();
             String remoteStoreRepository = remStoreBasedShardMetadata.getRemoteStoreRepository();
-            RemoteStoreMetadataLockManager remoteStoreMetadataLockManger = remoteStoreLockManagerFactory.newLockManager(
+            RemoteStoreLockManager remoteStoreMetadataLockManger = remoteStoreLockManagerFactory.newLockManager(
                 remoteStoreRepository,
                 indexUUID,
                 String.valueOf(shardId.shardId())
@@ -1159,11 +1160,24 @@ private void executeStaleShardDelete(
                                 // Releasing lock file before deleting the shallow-snap-UUID file because in case of any failure while
                                 // releasing the lock file, we would still have the shallow-snap-UUID file and that would be used during
                                 // next delete operation for releasing this lock file
-                                RemoteStoreMetadataLockManager remoteStoreMetadataLockManager = remoteStoreLockManagerFactory
-                                    .newLockManager(remoteStoreRepoForIndex, indexUUID, shardId);
+                                RemoteStoreLockManager remoteStoreMetadataLockManager = remoteStoreLockManagerFactory.newLockManager(
+                                    remoteStoreRepoForIndex,
+                                    indexUUID,
+                                    shardId
+                                );
                                 remoteStoreMetadataLockManager.release(
                                     FileLockInfo.getLockInfoBuilder().withAcquirerId(snapshotUUID).build()
                                 );
+                                if (!isIndexPresent(clusterService, indexUUID)) {
+                                    // this is a temporary solution where snapshot deletion triggers remote store side
+                                    // cleanup if index is already deleted. We will add a poller in future to take
+                                    // care of remote store side cleanup.
+                                    // see https://github.com/opensearch-project/OpenSearch/issues/8469
+                                    new RemoteSegmentStoreDirectoryFactory(
+                                        remoteStoreLockManagerFactory.getRepositoriesService(),
+                                        threadPool
+                                    ).newDirectory(remoteStoreRepoForIndex, indexUUID, shardId).close();
+                                }
                             }
                         }
                     }
@@ -1574,6 +1588,15 @@ private void cleanupStaleIndices(
         }
     }
 
+    private static boolean isIndexPresent(ClusterService clusterService, String indexUUID) {
+        for (final IndexMetadata indexMetadata : clusterService.state().metadata().getIndices().values()) {
+            if (indexUUID.equals(indexMetadata.getIndexUUID())) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     private void executeOneStaleIndexDelete(
         BlockingQueue<Map.Entry<String, BlobContainer>> staleIndicesToDelete,
         RemoteStoreLockManagerFactory remoteStoreLockManagerFactory,
@@ -1606,11 +1629,21 @@ private void executeOneStaleIndexDelete(
                                         // Releasing lock files before deleting the shallow-snap-UUID file because in case of any failure
                                         // while releasing the lock file, we would still have the corresponding shallow-snap-UUID file
                                         // and that would be used during next delete operation for releasing this stale lock file
-                                        RemoteStoreMetadataLockManager remoteStoreMetadataLockManager = remoteStoreLockManagerFactory
+                                        RemoteStoreLockManager remoteStoreMetadataLockManager = remoteStoreLockManagerFactory
                                             .newLockManager(remoteStoreRepoForIndex, indexUUID, shardBlob.getKey());
                                         remoteStoreMetadataLockManager.release(
                                             FileLockInfo.getLockInfoBuilder().withAcquirerId(snapshotUUID).build()
                                         );
+                                        if (!isIndexPresent(clusterService, indexUUID)) {
+                                            // this is a temporary solution where snapshot deletion triggers remote store side
+                                            // cleanup if index is already deleted. We will add a poller in future to take
+                                            // care of remote store side cleanup.
+                                            // see https://github.com/opensearch-project/OpenSearch/issues/8469
+                                            new RemoteSegmentStoreDirectoryFactory(
+                                                remoteStoreLockManagerFactory.getRepositoriesService(),
+                                                threadPool
+                                            ).newDirectory(remoteStoreRepoForIndex, indexUUID, shardBlob.getKey()).close();
+                                        }
                                     }
                                 }
                             }

server/src/test/java/org/opensearch/repositories/blobstore/BlobStoreRepositoryTests.java

@@ -166,8 +166,6 @@ public void testRetrieveSnapshots() throws Exception {
         assertThat(snapshotIds, equalTo(originalSnapshots));
     }
 
-    // Validate Scenario remoteStoreShallowCopy Snapshot -> remoteStoreShallowCopy Snapshot
-    // -> remoteStoreShallowCopy Snapshot -> normal snapshot
     public void testReadAndWriteSnapshotsThroughIndexFile() throws Exception {
         final BlobStoreRepository repository = setupRepo();
         final long pendingGeneration = repository.metadata.pendingGeneration();

test/framework/src/main/java/org/opensearch/snapshots/AbstractSnapshotIntegTestCase.java

@@ -558,6 +558,11 @@ protected String[] getLockFilesInRemoteStore(String remoteStoreIndex, String rem
             .prepareGetSettings(remoteStoreIndex)
             .get()
             .getSetting(remoteStoreIndex, IndexMetadata.SETTING_INDEX_UUID);
+        return getLockFilesInRemoteStore(remoteStoreIndex, remoteStoreRepositoryName, indexUUID);
+    }
+
+    protected String[] getLockFilesInRemoteStore(String remoteStoreIndex, String remoteStoreRepositoryName, String indexUUID)
+        throws IOException {
         final RepositoriesService repositoriesService = internalCluster().getCurrentClusterManagerNodeInstance(RepositoriesService.class);
         final BlobStoreRepository remoteStoreRepository = (BlobStoreRepository) repositoriesService.repository(remoteStoreRepositoryName);
         BlobPath shardLevelBlobPath = remoteStoreRepository.basePath().add(indexUUID).add("0").add("segments").add("lock_files");