[Remote Store] Add implementation for path types and change default p…

…ath type

Signed-off-by: Ashish Singh <ssashish@amazon.com>

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

@@ -21,6 +21,7 @@
 import org.opensearch.cluster.ClusterState;
 import org.opensearch.cluster.metadata.IndexMetadata;
 import org.opensearch.common.Nullable;
+import org.opensearch.common.blobstore.BlobPath;
 import org.opensearch.common.io.PathUtils;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.util.io.IOUtils;
@@ -56,6 +57,10 @@
 
 import static org.opensearch.cluster.metadata.IndexMetadata.SETTING_REMOTE_SEGMENT_STORE_REPOSITORY;
 import static org.opensearch.cluster.metadata.IndexMetadata.SETTING_REMOTE_STORE_ENABLED;
+import static org.opensearch.index.remote.RemoteStoreEnums.DataCategory.SEGMENTS;
+import static org.opensearch.index.remote.RemoteStoreEnums.DataCategory.TRANSLOG;
+import static org.opensearch.index.remote.RemoteStoreEnums.DataType.DATA;
+import static org.opensearch.index.remote.RemoteStoreEnums.DataType.METADATA;
 import static org.opensearch.indices.IndicesService.CLUSTER_REMOTE_STORE_PATH_PREFIX_TYPE_SETTING;
 import static org.opensearch.test.hamcrest.OpenSearchAssertions.assertAcked;
 import static org.hamcrest.Matchers.equalTo;
@@ -279,6 +284,11 @@ public void testRemoteStoreCustomDataOnIndexCreationAndRestore() {
         String restoredIndexName1version1 = indexName1 + "-restored-1";
         String restoredIndexName1version2 = indexName1 + "-restored-2";
 
+        client(clusterManagerNode).admin()
+            .cluster()
+            .prepareUpdateSettings()
+            .setTransientSettings(Settings.builder().put(CLUSTER_REMOTE_STORE_PATH_PREFIX_TYPE_SETTING.getKey(), PathType.FIXED))
+            .get();
         createRepository(snapshotRepoName, "fs", getRepositorySettings(absolutePath1, true));
         Client client = client();
         Settings indexSettings = getIndexSettings(1, 0).build();
@@ -476,12 +486,15 @@ public void testRestoreInSameRemoteStoreEnabledIndex() throws IOException {
     }
 
     void assertRemoteSegmentsAndTranslogUploaded(String idx) throws IOException {
-        String indexUUID = client().admin().indices().prepareGetSettings(idx).get().getSetting(idx, IndexMetadata.SETTING_INDEX_UUID);
-
-        Path remoteTranslogMetadataPath = Path.of(String.valueOf(remoteRepoPath), indexUUID, "/0/translog/metadata");
-        Path remoteTranslogDataPath = Path.of(String.valueOf(remoteRepoPath), indexUUID, "/0/translog/data");
-        Path segmentMetadataPath = Path.of(String.valueOf(remoteRepoPath), indexUUID, "/0/segments/metadata");
-        Path segmentDataPath = Path.of(String.valueOf(remoteRepoPath), indexUUID, "/0/segments/data");
+        Client client = client();
+        String path = getShardLevelBlobPath(client, idx, new BlobPath(), "0", TRANSLOG, METADATA).buildAsString();
+        Path remoteTranslogMetadataPath = Path.of(remoteRepoPath + "/" + path);
+        path = getShardLevelBlobPath(client, idx, new BlobPath(), "0", TRANSLOG, DATA).buildAsString();
+        Path remoteTranslogDataPath = Path.of(remoteRepoPath + "/" + path);
+        path = getShardLevelBlobPath(client, idx, new BlobPath(), "0", SEGMENTS, METADATA).buildAsString();
+        Path segmentMetadataPath = Path.of(remoteRepoPath + "/" + path);
+        path = getShardLevelBlobPath(client, idx, new BlobPath(), "0", SEGMENTS, DATA).buildAsString();
+        Path segmentDataPath = Path.of(remoteRepoPath + "/" + path);
 
         try (
             Stream<Path> translogMetadata = Files.list(remoteTranslogMetadataPath);

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

@@ -23,6 +23,7 @@
 import org.opensearch.cluster.routing.RecoverySource;
 import org.opensearch.cluster.routing.allocation.command.MoveAllocationCommand;
 import org.opensearch.common.Priority;
+import org.opensearch.common.blobstore.BlobPath;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.unit.TimeValue;
 import org.opensearch.common.util.concurrent.BufferedAsyncIOProcessor;
@@ -57,7 +58,11 @@
 
 import static org.opensearch.cluster.metadata.IndexMetadata.SETTING_NUMBER_OF_REPLICAS;
 import static org.opensearch.cluster.metadata.IndexMetadata.SETTING_NUMBER_OF_SHARDS;
+import static org.opensearch.index.remote.RemoteStoreEnums.DataCategory.SEGMENTS;
+import static org.opensearch.index.remote.RemoteStoreEnums.DataType.DATA;
+import static org.opensearch.index.remote.RemoteStoreEnums.DataType.METADATA;
 import static org.opensearch.indices.RemoteStoreSettings.CLUSTER_REMOTE_TRANSLOG_BUFFER_INTERVAL_SETTING;
+import static org.opensearch.test.OpenSearchTestCase.getShardLevelBlobPath;
 import static org.opensearch.test.hamcrest.OpenSearchAssertions.assertAcked;
 import static org.opensearch.test.hamcrest.OpenSearchAssertions.assertHitCount;
 import static org.hamcrest.Matchers.comparesEqualTo;
@@ -182,13 +187,9 @@ public void testStaleCommitDeletionWithInvokeFlush() throws Exception {
         createIndex(INDEX_NAME, remoteStoreIndexSettings(1, 10000l, -1));
         int numberOfIterations = randomIntBetween(5, 15);
         indexData(numberOfIterations, true, INDEX_NAME);
-        String indexUUID = client().admin()
-            .indices()
-            .prepareGetSettings(INDEX_NAME)
-            .get()
-            .getSetting(INDEX_NAME, IndexMetadata.SETTING_INDEX_UUID);
-        Path indexPath = Path.of(String.valueOf(segmentRepoPath), indexUUID, "/0/segments/metadata");
-
+        String shardPath = getShardLevelBlobPath(client(), INDEX_NAME, BlobPath.cleanPath(), "0", SEGMENTS, METADATA).buildAsString();
+        Path indexPath = Path.of(segmentRepoPath + "/" + shardPath);
+        ;
         IndexShard indexShard = getIndexShard(dataNode, INDEX_NAME);
         int lastNMetadataFilesToKeep = indexShard.getRemoteStoreSettings().getMinRemoteSegmentMetadataFiles();
         // Delete is async.
@@ -212,12 +213,8 @@ public void testStaleCommitDeletionWithoutInvokeFlush() throws Exception {
         createIndex(INDEX_NAME, remoteStoreIndexSettings(1, 10000l, -1));
         int numberOfIterations = randomIntBetween(5, 15);
         indexData(numberOfIterations, false, INDEX_NAME);
-        String indexUUID = client().admin()
-            .indices()
-            .prepareGetSettings(INDEX_NAME)
-            .get()
-            .getSetting(INDEX_NAME, IndexMetadata.SETTING_INDEX_UUID);
-        Path indexPath = Path.of(String.valueOf(segmentRepoPath), indexUUID, "/0/segments/metadata");
+        String shardPath = getShardLevelBlobPath(client(), INDEX_NAME, BlobPath.cleanPath(), "0", SEGMENTS, METADATA).buildAsString();
+        Path indexPath = Path.of(segmentRepoPath + "/" + shardPath);
         int actualFileCount = getFileCount(indexPath);
         // We also allow (numberOfIterations + 1) as index creation also triggers refresh.
         MatcherAssert.assertThat(actualFileCount, is(oneOf(numberOfIterations - 1, numberOfIterations, numberOfIterations + 1)));
@@ -231,12 +228,8 @@ public void testStaleCommitDeletionWithMinSegmentFiles_3() throws Exception {
         createIndex(INDEX_NAME, remoteStoreIndexSettings(1, 10000l, -1));
         int numberOfIterations = randomIntBetween(5, 15);
         indexData(numberOfIterations, true, INDEX_NAME);
-        String indexUUID = client().admin()
-            .indices()
-            .prepareGetSettings(INDEX_NAME)
-            .get()
-            .getSetting(INDEX_NAME, IndexMetadata.SETTING_INDEX_UUID);
-        Path indexPath = Path.of(String.valueOf(segmentRepoPath), indexUUID, "/0/segments/metadata");
+        String shardPath = getShardLevelBlobPath(client(), INDEX_NAME, BlobPath.cleanPath(), "0", SEGMENTS, METADATA).buildAsString();
+        Path indexPath = Path.of(segmentRepoPath + "/" + shardPath);
         int actualFileCount = getFileCount(indexPath);
         // We also allow (numberOfIterations + 1) as index creation also triggers refresh.
         MatcherAssert.assertThat(actualFileCount, is(oneOf(4)));
@@ -250,12 +243,9 @@ public void testStaleCommitDeletionWithMinSegmentFiles_Disabled() throws Excepti
         createIndex(INDEX_NAME, remoteStoreIndexSettings(1, 10000l, -1));
         int numberOfIterations = randomIntBetween(12, 18);
         indexData(numberOfIterations, true, INDEX_NAME);
-        String indexUUID = client().admin()
-            .indices()
-            .prepareGetSettings(INDEX_NAME)
-            .get()
-            .getSetting(INDEX_NAME, IndexMetadata.SETTING_INDEX_UUID);
-        Path indexPath = Path.of(String.valueOf(segmentRepoPath), indexUUID, "/0/segments/metadata");
+        String shardPath = getShardLevelBlobPath(client(), INDEX_NAME, BlobPath.cleanPath(), "0", SEGMENTS, METADATA).buildAsString();
+        Path indexPath = Path.of(segmentRepoPath + "/" + shardPath);
+        ;
         int actualFileCount = getFileCount(indexPath);
         // We also allow (numberOfIterations + 1) as index creation also triggers refresh.
         MatcherAssert.assertThat(actualFileCount, is(oneOf(numberOfIterations + 1)));
@@ -589,12 +579,8 @@ public void testFallbackToNodeToNodeSegmentCopy() throws Exception {
         flushAndRefresh(INDEX_NAME);
 
         // 3. Delete data from remote segment store
-        String indexUUID = client().admin()
-            .indices()
-            .prepareGetSettings(INDEX_NAME)
-            .get()
-            .getSetting(INDEX_NAME, IndexMetadata.SETTING_INDEX_UUID);
-        Path segmentDataPath = Path.of(String.valueOf(segmentRepoPath), indexUUID, "/0/segments/data");
+        String shardPath = getShardLevelBlobPath(client(), INDEX_NAME, BlobPath.cleanPath(), "0", SEGMENTS, DATA).buildAsString();
+        Path segmentDataPath = Path.of(segmentRepoPath + "/" + shardPath);
 
         try (Stream<Path> files = Files.list(segmentDataPath)) {
             files.forEach(p -> {

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

@@ -11,6 +11,7 @@
 import org.opensearch.action.admin.cluster.settings.ClusterUpdateSettingsResponse;
 import org.opensearch.action.admin.indices.stats.IndicesStatsRequest;
 import org.opensearch.action.admin.indices.stats.IndicesStatsResponse;
+import org.opensearch.common.blobstore.BlobPath;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.test.OpenSearchIntegTestCase;
 
@@ -22,7 +23,10 @@
 import java.util.Set;
 import java.util.concurrent.TimeUnit;
 
+import static org.opensearch.index.remote.RemoteStoreEnums.DataCategory.SEGMENTS;
+import static org.opensearch.index.remote.RemoteStoreEnums.DataType.DATA;
 import static org.opensearch.index.remote.RemoteStorePressureSettings.REMOTE_REFRESH_SEGMENT_PRESSURE_ENABLED;
+import static org.opensearch.test.OpenSearchTestCase.getShardLevelBlobPath;
 
 @OpenSearchIntegTestCase.ClusterScope(scope = OpenSearchIntegTestCase.Scope.TEST, numDataNodes = 0)
 public class RemoteStoreRefreshListenerIT extends AbstractRemoteStoreMockRepositoryIntegTestCase {
@@ -45,8 +49,10 @@ public void testRemoteRefreshRetryOnFailure() throws Exception {
         IndicesStatsResponse response = client().admin().indices().stats(new IndicesStatsRequest()).get();
         assertEquals(1, response.getShards().length);
 
+        String indexName = response.getShards()[0].getShardRouting().index().getName();
         String indexUuid = response.getShards()[0].getShardRouting().index().getUUID();
-        Path segmentDataRepoPath = location.resolve(String.format(Locale.ROOT, "%s/0/segments/data", indexUuid));
+        String shardPath = getShardLevelBlobPath(client(), indexName, new BlobPath(), "0", SEGMENTS, DATA).buildAsString();
+        Path segmentDataRepoPath = location.resolve(shardPath);
         String segmentDataLocalPath = String.format(Locale.ROOT, "%s/indices/%s/0/index", response.getShards()[0].getDataPath(), indexUuid);
 
         logger.info("--> Verify that the segment files are same on local and repository eventually");

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

@@ -14,9 +14,14 @@
 import org.opensearch.cluster.metadata.IndexMetadata;
 import org.opensearch.common.UUIDs;
 import org.opensearch.common.action.ActionFuture;
+import org.opensearch.common.blobstore.BlobContainer;
+import org.opensearch.common.blobstore.BlobPath;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.unit.TimeValue;
+import org.opensearch.index.store.RemoteBufferedOutputDirectory;
 import org.opensearch.remotestore.RemoteStoreBaseIntegTestCase;
+import org.opensearch.repositories.RepositoriesService;
+import org.opensearch.repositories.blobstore.BlobStoreRepository;
 import org.opensearch.test.OpenSearchIntegTestCase;
 
 import java.nio.file.Path;
@@ -27,6 +32,8 @@
 import java.util.concurrent.TimeUnit;
 import java.util.stream.Stream;
 
+import static org.opensearch.index.remote.RemoteStoreEnums.DataCategory.SEGMENTS;
+import static org.opensearch.index.remote.RemoteStoreEnums.DataType.LOCK_FILES;
 import static org.opensearch.remotestore.RemoteStoreBaseIntegTestCase.remoteStoreClusterSettings;
 import static org.opensearch.test.hamcrest.OpenSearchAssertions.assertAcked;
 import static org.hamcrest.Matchers.comparesEqualTo;
@@ -307,7 +314,21 @@ public void testRemoteStoreCleanupForDeletedIndex() throws Exception {
         SnapshotInfo snapshotInfo1 = createFullSnapshot(snapshotRepoName, "snap1");
         SnapshotInfo snapshotInfo2 = createFullSnapshot(snapshotRepoName, "snap2");
 
-        String[] lockFiles = getLockFilesInRemoteStore(remoteStoreEnabledIndexName, REMOTE_REPO_NAME);
+        final RepositoriesService repositoriesService = internalCluster().getCurrentClusterManagerNodeInstance(RepositoriesService.class);
+        final BlobStoreRepository remoteStoreRepository = (BlobStoreRepository) repositoriesService.repository(REMOTE_REPO_NAME);
+        BlobPath shardLevelBlobPath = getShardLevelBlobPath(
+            client(),
+            remoteStoreEnabledIndexName,
+            remoteStoreRepository.basePath(),
+            "0",
+            SEGMENTS,
+            LOCK_FILES
+        );
+        BlobContainer blobContainer = remoteStoreRepository.blobStore().blobContainer(shardLevelBlobPath);
+        String[] lockFiles;
+        try (RemoteBufferedOutputDirectory lockDirectory = new RemoteBufferedOutputDirectory(blobContainer)) {
+            lockFiles = lockDirectory.listAll();
+        }
         assert (lockFiles.length == 2) : "lock files are " + Arrays.toString(lockFiles);
 
         // delete remote store index
@@ -320,7 +341,9 @@ public void testRemoteStoreCleanupForDeletedIndex() throws Exception {
             .get();
         assertAcked(deleteSnapshotResponse);
 
-        lockFiles = getLockFilesInRemoteStore(remoteStoreEnabledIndexName, REMOTE_REPO_NAME, indexUUID);
+        try (RemoteBufferedOutputDirectory lockDirectory = new RemoteBufferedOutputDirectory(blobContainer)) {
+            lockFiles = lockDirectory.listAll();
+        }
         assert (lockFiles.length == 1) : "lock files are " + Arrays.toString(lockFiles);
         assertTrue(lockFiles[0].contains(snapshotInfo2.snapshotId().getUUID()));
 

server/src/main/java/org/opensearch/index/remote/RemoteStoreEnums.java

@@ -103,9 +103,24 @@ boolean requiresHashAlgorithm() {
         HASHED_PREFIX(1) {
             @Override
             public BlobPath generatePath(PathInput pathInput, PathHashAlgorithm hashAlgorithm) {
-                // TODO - We need to implement this, keeping the same path as Fixed for sake of multiple tests that can fail otherwise.
-                // throw new UnsupportedOperationException("Not implemented"); --> Not using this for unblocking couple of tests.
+                assert Objects.nonNull(hashAlgorithm) : "hashAlgorithm is expected to be non-null";
+                return addPrefix(pathInput.basePath(), hashAlgorithm.hash(pathInput)).add(pathInput.indexUUID())
+                    .add(pathInput.shardId())
+                    .add(pathInput.dataCategory().getName())
+                    .add(pathInput.dataType().getName());
+            }
+
+            @Override
+            boolean requiresHashAlgorithm() {
+                return true;
+            }
+        },
+        HASHED_INFIX(2) {
+            @Override
+            public BlobPath generatePath(PathInput pathInput, PathHashAlgorithm hashAlgorithm) {
+                assert Objects.nonNull(hashAlgorithm) : "hashAlgorithm is expected to be non-null";
                 return pathInput.basePath()
+                    .add(hashAlgorithm.hash(pathInput))
                     .add(pathInput.indexUUID())
                     .add(pathInput.shardId())
                     .add(pathInput.dataCategory().getName())
@@ -200,10 +215,11 @@ public enum PathHashAlgorithm {
 
         FNV_1A(0) {
             @Override
-            long hash(PathInput pathInput) {
+            String hash(PathInput pathInput) {
                 String input = pathInput.indexUUID() + pathInput.shardId() + pathInput.dataCategory().getName() + pathInput.dataType()
                     .getName();
-                return FNV1a.hash32(input);
+                long hash = FNV1a.hash64(input);
+                return RemoteStoreUtils.longToBase64(hash);
             }
         };
 
@@ -218,6 +234,7 @@ public int getCode() {
         }
 
         private static final Map<Integer, PathHashAlgorithm> CODE_TO_ENUM;
+
         static {
             PathHashAlgorithm[] values = values();
             Map<Integer, PathHashAlgorithm> codeToStatus = new HashMap<>(values.length);
@@ -240,7 +257,7 @@ public static PathHashAlgorithm fromCode(int code) {
             return CODE_TO_ENUM.get(code);
         }
 
-        abstract long hash(PathInput pathInput);
+        abstract String hash(PathInput pathInput);
 
         public static PathHashAlgorithm parseString(String pathHashAlgorithm) {
             try {
@@ -257,4 +274,13 @@ public static PathHashAlgorithm parseString(String pathHashAlgorithm) {
          */
         public static final String NAME = "path_hash_algorithm";
     }
+
+    static BlobPath addPrefix(BlobPath blobPath, String prefix) {
+        BlobPath updatedPath = BlobPath.cleanPath();
+        updatedPath = updatedPath.add(prefix);
+        for (String path : blobPath) {
+            updatedPath = updatedPath.add(path);
+        }
+        return updatedPath;
+    }
 }

server/src/main/java/org/opensearch/index/remote/RemoteStoreUtils.java

@@ -10,7 +10,9 @@
 
 import org.opensearch.common.collect.Tuple;
 
+import java.nio.ByteBuffer;
 import java.util.Arrays;
+import java.util.Base64;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -101,4 +103,26 @@ public static void verifyNoMultipleWriters(List<String> mdFiles, Function<String
         });
     }
 
+    /**
+     * Converts an input hash which occupies 64 bits of space into Base64 (6 bits per character) String. This must not
+     * be changed as it is used for creating path for storing remote store data on the remote store.
+     */
+    static String longToBase64(long value) {
+        byte[] hashBytes = ByteBuffer.allocate(Long.BYTES).putLong(value).array();
+        return base64(hashBytes);
+    }
+
+    /**
+     * This converts the byte array to base 64 string. `/` is replaced with `_`, `+` is replaced with `-` and `=`
+     * which is padded at the last is also removed. These characters are either used as delimiter or special character
+     * requiring special handling in some vendors. The characters present in this base64 version are [A-Za-z0-9_-].
+     * This must not be changed as it is used for creating path for storing remote store data on the remote store.
+     *
+     * @param bytes byte array
+     * @return base 64 string.
+     */
+    private static String base64(byte[] bytes) {
+        String base64 = Base64.getEncoder().encodeToString(bytes);
+        return base64.substring(0, base64.length() - 1).replace('/', '_').replace('+', '-');
+    }
 }

server/src/main/java/org/opensearch/indices/IndicesService.java

@@ -312,7 +312,7 @@ public class IndicesService extends AbstractLifecycleComponent
      */
     public static final Setting<PathType> CLUSTER_REMOTE_STORE_PATH_PREFIX_TYPE_SETTING = new Setting<>(
         "cluster.remote_store.index.path.prefix.type",
-        PathType.FIXED.toString(),
+        PathType.HASHED_PREFIX.toString(),
         PathType::parseString,
         Property.NodeScope,
         Property.Dynamic