Remove the IndexCommitRef class (opensearch-project#2421)

This inner class is no longer required because its functionality has been moved to the generic GatedCloseable class.

Signed-off-by: Kartik Ganesh <gkart@amazon.com>

server/src/internalClusterTest/java/org/opensearch/action/admin/indices/forcemerge/ForceMergeIT.java

@@ -32,11 +32,13 @@
 
 package org.opensearch.action.admin.indices.forcemerge;
 
+import org.apache.lucene.index.IndexCommit;
 import org.opensearch.action.admin.indices.flush.FlushResponse;
 import org.opensearch.cluster.ClusterState;
 import org.opensearch.cluster.metadata.IndexMetadata;
 import org.opensearch.cluster.routing.IndexRoutingTable;
 import org.opensearch.cluster.routing.IndexShardRoutingTable;
+import org.opensearch.common.concurrent.GatedCloseable;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.index.Index;
 import org.opensearch.index.engine.Engine;
@@ -99,8 +101,8 @@ public void testForceMergeUUIDConsistent() throws IOException {
     }
 
     private static String getForceMergeUUID(IndexShard indexShard) throws IOException {
-        try (Engine.IndexCommitRef indexCommitRef = indexShard.acquireLastIndexCommit(true)) {
-            return indexCommitRef.get().getUserData().get(Engine.FORCE_MERGE_UUID_KEY);
+        try (GatedCloseable<IndexCommit> wrappedIndexCommit = indexShard.acquireLastIndexCommit(true)) {
+            return wrappedIndexCommit.get().getUserData().get(Engine.FORCE_MERGE_UUID_KEY);
         }
     }
 }

server/src/internalClusterTest/java/org/opensearch/indices/recovery/IndexRecoveryIT.java

@@ -33,8 +33,8 @@
 package org.opensearch.indices.recovery;
 
 import org.apache.lucene.analysis.TokenStream;
+import org.apache.lucene.index.IndexCommit;
 import org.apache.lucene.util.SetOnce;
-
 import org.opensearch.OpenSearchException;
 import org.opensearch.Version;
 import org.opensearch.action.admin.cluster.health.ClusterHealthResponse;
@@ -75,6 +75,7 @@
 import org.opensearch.common.Strings;
 import org.opensearch.common.breaker.CircuitBreaker;
 import org.opensearch.common.breaker.CircuitBreakingException;
+import org.opensearch.common.concurrent.GatedCloseable;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.unit.ByteSizeUnit;
 import org.opensearch.common.unit.ByteSizeValue;
@@ -88,7 +89,6 @@
 import org.opensearch.index.MockEngineFactoryPlugin;
 import org.opensearch.index.analysis.AbstractTokenFilterFactory;
 import org.opensearch.index.analysis.TokenFilterFactory;
-import org.opensearch.index.engine.Engine;
 import org.opensearch.index.mapper.MapperParsingException;
 import org.opensearch.index.recovery.RecoveryStats;
 import org.opensearch.index.seqno.ReplicationTracker;
@@ -114,11 +114,11 @@
 import org.opensearch.snapshots.SnapshotState;
 import org.opensearch.tasks.Task;
 import org.opensearch.test.BackgroundIndexer;
+import org.opensearch.test.InternalSettingsPlugin;
+import org.opensearch.test.InternalTestCluster;
 import org.opensearch.test.OpenSearchIntegTestCase;
 import org.opensearch.test.OpenSearchIntegTestCase.ClusterScope;
 import org.opensearch.test.OpenSearchIntegTestCase.Scope;
-import org.opensearch.test.InternalSettingsPlugin;
-import org.opensearch.test.InternalTestCluster;
 import org.opensearch.test.engine.MockEngineSupport;
 import org.opensearch.test.store.MockFSIndexStore;
 import org.opensearch.test.transport.MockTransportService;
@@ -151,12 +151,6 @@
 
 import static java.util.Collections.singletonMap;
 import static java.util.stream.Collectors.toList;
-import static org.opensearch.action.DocWriteResponse.Result.CREATED;
-import static org.opensearch.action.DocWriteResponse.Result.UPDATED;
-import static org.opensearch.node.RecoverySettingsChunkSizePlugin.CHUNK_SIZE_SETTING;
-import static org.opensearch.test.hamcrest.OpenSearchAssertions.assertAcked;
-import static org.opensearch.test.hamcrest.OpenSearchAssertions.assertHitCount;
-
 import static org.hamcrest.Matchers.empty;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.everyItem;
@@ -167,6 +161,11 @@
 import static org.hamcrest.Matchers.isOneOf;
 import static org.hamcrest.Matchers.lessThanOrEqualTo;
 import static org.hamcrest.Matchers.not;
+import static org.opensearch.action.DocWriteResponse.Result.CREATED;
+import static org.opensearch.action.DocWriteResponse.Result.UPDATED;
+import static org.opensearch.node.RecoverySettingsChunkSizePlugin.CHUNK_SIZE_SETTING;
+import static org.opensearch.test.hamcrest.OpenSearchAssertions.assertAcked;
+import static org.opensearch.test.hamcrest.OpenSearchAssertions.assertHitCount;
 
 @ClusterScope(scope = Scope.TEST, numDataNodes = 0)
 public class IndexRecoveryIT extends OpenSearchIntegTestCase {
@@ -1599,9 +1598,9 @@ public void testRecoverLocallyUpToGlobalCheckpoint() throws Exception {
             .getShardOrNull(new ShardId(resolveIndex(indexName), 0));
         final long lastSyncedGlobalCheckpoint = shard.getLastSyncedGlobalCheckpoint();
         final long localCheckpointOfSafeCommit;
-        try (Engine.IndexCommitRef safeCommitRef = shard.acquireSafeIndexCommit()) {
+        try (GatedCloseable<IndexCommit> wrappedSafeCommit = shard.acquireSafeIndexCommit()) {
             localCheckpointOfSafeCommit = SequenceNumbers.loadSeqNoInfoFromLuceneCommit(
-                safeCommitRef.get().getUserData().entrySet()
+                wrappedSafeCommit.get().getUserData().entrySet()
             ).localCheckpoint;
         }
         final long maxSeqNo = shard.seqNoStats().getMaxSeqNo();

server/src/main/java/org/opensearch/index/engine/Engine.java

@@ -55,7 +55,6 @@
 import org.apache.lucene.util.SetOnce;
 import org.opensearch.ExceptionsHelper;
 import org.opensearch.action.index.IndexRequest;
-import org.opensearch.common.CheckedRunnable;
 import org.opensearch.common.Nullable;
 import org.opensearch.common.bytes.BytesReference;
 import org.opensearch.common.collect.ImmutableOpenMap;
@@ -1109,12 +1108,12 @@ public abstract void forceMerge(
      *
      * @param flushFirst indicates whether the engine should flush before returning the snapshot
      */
-    public abstract IndexCommitRef acquireLastIndexCommit(boolean flushFirst) throws EngineException;
+    public abstract GatedCloseable<IndexCommit> acquireLastIndexCommit(boolean flushFirst) throws EngineException;
 
     /**
      * Snapshots the most recent safe index commit from the engine.
      */
-    public abstract IndexCommitRef acquireSafeIndexCommit() throws EngineException;
+    public abstract GatedCloseable<IndexCommit> acquireSafeIndexCommit() throws EngineException;
 
     /**
      * @return a summary of the contents of the current safe commit
@@ -1829,12 +1828,6 @@ private void awaitPendingClose() {
         }
     }
 
-    public static class IndexCommitRef extends GatedCloseable<IndexCommit> {
-        public IndexCommitRef(IndexCommit indexCommit, CheckedRunnable<IOException> onClose) {
-            super(indexCommit, onClose);
-        }
-    }
-
     public void onSettingsChanged(TimeValue translogRetentionAge, ByteSizeValue translogRetentionSize, long softDeletesRetentionOps) {
 
     }

server/src/main/java/org/opensearch/index/engine/InternalEngine.java

@@ -72,6 +72,7 @@
 import org.opensearch.common.Booleans;
 import org.opensearch.common.Nullable;
 import org.opensearch.common.SuppressForbidden;
+import org.opensearch.common.concurrent.GatedCloseable;
 import org.opensearch.common.lease.Releasable;
 import org.opensearch.common.lucene.LoggerInfoStream;
 import org.opensearch.common.lucene.Lucene;
@@ -103,10 +104,10 @@
 import org.opensearch.index.seqno.SequenceNumbers;
 import org.opensearch.index.shard.OpenSearchMergePolicy;
 import org.opensearch.index.shard.ShardId;
+import org.opensearch.index.translog.DefaultTranslogDeletionPolicy;
 import org.opensearch.index.translog.Translog;
 import org.opensearch.index.translog.TranslogConfig;
 import org.opensearch.index.translog.TranslogCorruptedException;
-import org.opensearch.index.translog.DefaultTranslogDeletionPolicy;
 import org.opensearch.index.translog.TranslogDeletionPolicy;
 import org.opensearch.index.translog.TranslogStats;
 import org.opensearch.search.suggest.completion.CompletionStats;
@@ -2193,7 +2194,7 @@ public void forceMerge(
     }
 
     @Override
-    public IndexCommitRef acquireLastIndexCommit(final boolean flushFirst) throws EngineException {
+    public GatedCloseable<IndexCommit> acquireLastIndexCommit(final boolean flushFirst) throws EngineException {
         // we have to flush outside of the readlock otherwise we might have a problem upgrading
         // the to a write lock when we fail the engine in this operation
         if (flushFirst) {
@@ -2202,13 +2203,13 @@ public IndexCommitRef acquireLastIndexCommit(final boolean flushFirst) throws En
             logger.trace("finish flush for snapshot");
         }
         final IndexCommit lastCommit = combinedDeletionPolicy.acquireIndexCommit(false);
-        return new Engine.IndexCommitRef(lastCommit, () -> releaseIndexCommit(lastCommit));
+        return new GatedCloseable<>(lastCommit, () -> releaseIndexCommit(lastCommit));
     }
 
     @Override
-    public IndexCommitRef acquireSafeIndexCommit() throws EngineException {
+    public GatedCloseable<IndexCommit> acquireSafeIndexCommit() throws EngineException {
         final IndexCommit safeCommit = combinedDeletionPolicy.acquireIndexCommit(true);
-        return new Engine.IndexCommitRef(safeCommit, () -> releaseIndexCommit(safeCommit));
+        return new GatedCloseable<>(safeCommit, () -> releaseIndexCommit(safeCommit));
     }
 
     private void releaseIndexCommit(IndexCommit snapshot) throws IOException {

server/src/main/java/org/opensearch/index/engine/ReadOnlyEngine.java

@@ -41,6 +41,7 @@
 import org.apache.lucene.store.Lock;
 import org.opensearch.LegacyESVersion;
 import org.opensearch.Version;
+import org.opensearch.common.concurrent.GatedCloseable;
 import org.opensearch.common.lucene.Lucene;
 import org.opensearch.common.lucene.index.OpenSearchDirectoryReader;
 import org.opensearch.common.util.concurrent.ReleasableLock;
@@ -49,9 +50,9 @@
 import org.opensearch.index.seqno.SeqNoStats;
 import org.opensearch.index.seqno.SequenceNumbers;
 import org.opensearch.index.store.Store;
+import org.opensearch.index.translog.DefaultTranslogDeletionPolicy;
 import org.opensearch.index.translog.Translog;
 import org.opensearch.index.translog.TranslogConfig;
-import org.opensearch.index.translog.DefaultTranslogDeletionPolicy;
 import org.opensearch.index.translog.TranslogDeletionPolicy;
 import org.opensearch.index.translog.TranslogStats;
 import org.opensearch.search.suggest.completion.CompletionStats;
@@ -413,13 +414,13 @@ public void forceMerge(
     ) {}
 
     @Override
-    public IndexCommitRef acquireLastIndexCommit(boolean flushFirst) {
+    public GatedCloseable<IndexCommit> acquireLastIndexCommit(boolean flushFirst) {
         store.incRef();
-        return new IndexCommitRef(indexCommit, store::decRef);
+        return new GatedCloseable<>(indexCommit, store::decRef);
     }
 
     @Override
-    public IndexCommitRef acquireSafeIndexCommit() {
+    public GatedCloseable<IndexCommit> acquireSafeIndexCommit() {
         return acquireLastIndexCommit(false);
     }
 

server/src/main/java/org/opensearch/index/shard/IndexShard.java

@@ -51,9 +51,9 @@
 import org.apache.lucene.util.SetOnce;
 import org.apache.lucene.util.ThreadInterruptedException;
 import org.opensearch.Assertions;
+import org.opensearch.ExceptionsHelper;
 import org.opensearch.LegacyESVersion;
 import org.opensearch.OpenSearchException;
-import org.opensearch.ExceptionsHelper;
 import org.opensearch.action.ActionListener;
 import org.opensearch.action.ActionRunnable;
 import org.opensearch.action.admin.indices.flush.FlushRequest;
@@ -73,6 +73,7 @@
 import org.opensearch.common.CheckedRunnable;
 import org.opensearch.common.Nullable;
 import org.opensearch.common.collect.Tuple;
+import org.opensearch.common.concurrent.GatedCloseable;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.lease.Releasable;
 import org.opensearch.common.lease.Releasables;
@@ -1409,7 +1410,7 @@ public org.apache.lucene.util.Version minimumCompatibleVersion() {
      *
      * @param flushFirst <code>true</code> if the index should first be flushed to disk / a low level lucene commit should be executed
      */
-    public Engine.IndexCommitRef acquireLastIndexCommit(boolean flushFirst) throws EngineException {
+    public GatedCloseable<IndexCommit> acquireLastIndexCommit(boolean flushFirst) throws EngineException {
         final IndexShardState state = this.state; // one time volatile read
         // we allow snapshot on closed index shard, since we want to do one after we close the shard and before we close the engine
         if (state == IndexShardState.STARTED || state == IndexShardState.CLOSED) {
@@ -1423,7 +1424,7 @@ public Engine.IndexCommitRef acquireLastIndexCommit(boolean flushFirst) throws E
      * Snapshots the most recent safe index commit from the currently running engine.
      * All index files referenced by this index commit won't be freed until the commit/snapshot is closed.
      */
-    public Engine.IndexCommitRef acquireSafeIndexCommit() throws EngineException {
+    public GatedCloseable<IndexCommit> acquireSafeIndexCommit() throws EngineException {
         final IndexShardState state = this.state; // one time volatile read
         // we allow snapshot on closed index shard, since we want to do one after we close the shard and before we close the engine
         if (state == IndexShardState.STARTED || state == IndexShardState.CLOSED) {
@@ -1448,24 +1449,24 @@ public Engine.IndexCommitRef acquireSafeIndexCommit() throws EngineException {
      */
     public Store.MetadataSnapshot snapshotStoreMetadata() throws IOException {
         assert Thread.holdsLock(mutex) == false : "snapshotting store metadata under mutex";
-        Engine.IndexCommitRef indexCommit = null;
+        GatedCloseable<IndexCommit> wrappedIndexCommit = null;
         store.incRef();
         try {
             synchronized (engineMutex) {
                 // if the engine is not running, we can access the store directly, but we need to make sure no one starts
                 // the engine on us. If the engine is running, we can get a snapshot via the deletion policy of the engine.
                 final Engine engine = getEngineOrNull();
                 if (engine != null) {
-                    indexCommit = engine.acquireLastIndexCommit(false);
+                    wrappedIndexCommit = engine.acquireLastIndexCommit(false);
                 }
-                if (indexCommit == null) {
+                if (wrappedIndexCommit == null) {
                     return store.getMetadata(null, true);
                 }
             }
-            return store.getMetadata(indexCommit.get());
+            return store.getMetadata(wrappedIndexCommit.get());
         } finally {
             store.decRef();
-            IOUtils.close(indexCommit);
+            IOUtils.close(wrappedIndexCommit);
         }
     }
 
@@ -3913,7 +3914,7 @@ void resetEngineToGlobalCheckpoint() throws IOException {
                 true
             ) {
                 @Override
-                public IndexCommitRef acquireLastIndexCommit(boolean flushFirst) {
+                public GatedCloseable<IndexCommit> acquireLastIndexCommit(boolean flushFirst) {
                     synchronized (engineMutex) {
                         if (newEngineReference.get() == null) {
                             throw new AlreadyClosedException("engine was closed");
@@ -3924,7 +3925,7 @@ public IndexCommitRef acquireLastIndexCommit(boolean flushFirst) {
                 }
 
                 @Override
-                public IndexCommitRef acquireSafeIndexCommit() {
+                public GatedCloseable<IndexCommit> acquireSafeIndexCommit() {
                     synchronized (engineMutex) {
                         if (newEngineReference.get() == null) {
                             throw new AlreadyClosedException("engine was closed");

server/src/main/java/org/opensearch/index/shard/LocalShardSnapshot.java

@@ -32,13 +32,15 @@
 
 package org.opensearch.index.shard;
 
+import org.apache.lucene.index.IndexCommit;
 import org.apache.lucene.store.Directory;
 import org.apache.lucene.store.FilterDirectory;
 import org.apache.lucene.store.IOContext;
 import org.apache.lucene.store.IndexOutput;
 import org.apache.lucene.store.Lock;
 import org.apache.lucene.store.NoLockFactory;
 import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.common.concurrent.GatedCloseable;
 import org.opensearch.index.Index;
 import org.opensearch.index.engine.Engine;
 import org.opensearch.index.store.Store;
@@ -52,7 +54,7 @@
 final class LocalShardSnapshot implements Closeable {
     private final IndexShard shard;
     private final Store store;
-    private final Engine.IndexCommitRef indexCommit;
+    private final GatedCloseable<IndexCommit> wrappedIndexCommit;
     private final AtomicBoolean closed = new AtomicBoolean(false);
 
     LocalShardSnapshot(IndexShard shard) {
@@ -61,7 +63,7 @@ final class LocalShardSnapshot implements Closeable {
         store.incRef();
         boolean success = false;
         try {
-            indexCommit = shard.acquireLastIndexCommit(true);
+            wrappedIndexCommit = shard.acquireLastIndexCommit(true);
             success = true;
         } finally {
             if (success == false) {
@@ -88,7 +90,7 @@ Directory getSnapshotDirectory() {
         return new FilterDirectory(store.directory()) {
             @Override
             public String[] listAll() throws IOException {
-                Collection<String> fileNames = indexCommit.get().getFileNames();
+                Collection<String> fileNames = wrappedIndexCommit.get().getFileNames();
                 final String[] fileNameArray = fileNames.toArray(new String[fileNames.size()]);
                 return fileNameArray;
             }
@@ -143,7 +145,7 @@ public Set<String> getPendingDeletions() throws IOException {
     public void close() throws IOException {
         if (closed.compareAndSet(false, true)) {
             try {
-                indexCommit.close();
+                wrappedIndexCommit.close();
             } finally {
                 store.decRef();
             }
@@ -156,6 +158,6 @@ IndexMetadata getIndexMetadata() {
 
     @Override
     public String toString() {
-        return "local_shard_snapshot:[" + shard.shardId() + " indexCommit: " + indexCommit + "]";
+        return "local_shard_snapshot:[" + shard.shardId() + " indexCommit: " + wrappedIndexCommit + "]";
     }
 }