Clean unused iterators

src/main/java/it/cavallium/dbengine/database/LLUtils.java

@@ -7,6 +7,7 @@ import com.google.common.primitives.Longs;
 import it.cavallium.buffer.Buf;
 import it.cavallium.dbengine.client.HitEntry;
 import it.cavallium.dbengine.client.HitKey;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
 import it.cavallium.dbengine.database.serialization.SerializationFunction;
 import it.cavallium.dbengine.lucene.LuceneCloseable;
 import it.cavallium.dbengine.lucene.LuceneUtils;
@@ -472,13 +473,13 @@ public class LLUtils {
 	 * @param smallRange true if the range is small
 	 * @return the passed instance of ReadOptions, or a new one if the passed readOptions is null
 	 */
-	public static ReadOptions generateCustomReadOptions(@Nullable ReadOptions readOptions,
+	public static LLReadOptions generateCustomReadOptions(@Nullable LLReadOptions readOptions,
 			boolean canFillCache,
 			boolean boundedRange,
 			boolean smallRange) {
 		if (readOptions == null) {
 			//noinspection resource
-			readOptions = new ReadOptions();
+			readOptions = new LLReadOptions();
 		}
 		var hugeRange = !boundedRange && !smallRange;
 		if (hugeRange) {

src/main/java/it/cavallium/dbengine/database/disk/AbstractRocksDBColumn.java

@@ -10,9 +10,12 @@ import it.cavallium.buffer.Buf;
 import it.cavallium.dbengine.database.LLRange;
 import it.cavallium.dbengine.database.LLUtils;
 import it.cavallium.dbengine.database.RepeatedElementList;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
+import it.cavallium.dbengine.database.disk.rocksdb.LLSlice;
+import it.cavallium.dbengine.database.disk.rocksdb.LLWriteOptions;
 import it.cavallium.dbengine.database.disk.rocksdb.RocksIteratorObj;
 import it.cavallium.dbengine.database.serialization.SerializationFunction;
-import java.io.IOException;
+import it.cavallium.dbengine.utils.SimpleResource;
 import java.nio.ByteBuffer;
 import java.nio.charset.StandardCharsets;
 import java.util.List;
@@ -24,22 +27,18 @@ import org.apache.logging.log4j.Logger;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.rocksdb.AbstractImmutableNativeReference;
-import org.rocksdb.AbstractSlice;
 import org.rocksdb.ColumnFamilyHandle;
 import org.rocksdb.CompactRangeOptions;
 import org.rocksdb.FlushOptions;
 import org.rocksdb.Holder;
 import org.rocksdb.KeyMayExist;
-import org.rocksdb.ReadOptions;
 import org.rocksdb.RocksDB;
 import org.rocksdb.RocksDBException;
 import org.rocksdb.RocksObject;
-import org.rocksdb.Slice;
 import org.rocksdb.TableProperties;
 import org.rocksdb.Transaction;
 import org.rocksdb.TransactionOptions;
 import org.rocksdb.WriteBatch;
-import org.rocksdb.WriteOptions;
 
 public sealed abstract class AbstractRocksDBColumn<T extends RocksDB> implements RocksDBColumn
 		permits StandardRocksDBColumn, OptimisticRocksDBColumn, PessimisticRocksDBColumn {
@@ -80,6 +79,7 @@ public sealed abstract class AbstractRocksDBColumn<T extends RocksDB> implements
 	private final Timer updateRemovedTime;
 	private final Timer updateUnchangedTime;
 	private final DBColumnKeyMayExistGetter keyMayExistGetter;
+	private final IteratorMetrics iteratorMetrics;
 
 	public AbstractRocksDBColumn(T db,
 			String databaseName,
@@ -222,28 +222,27 @@ public sealed abstract class AbstractRocksDBColumn<T extends RocksDB> implements
 				.publishPercentileHistogram()
 				.tags("db.name", databaseName, "db.column", columnName, "update.type", "unchanged")
 				.register(meterRegistry);
+		this.iteratorMetrics = new IteratorMetrics(this.startedIterSeek,
+				this.endedIterSeek,
+				this.iterSeekTime,
+				this.startedIterNext,
+				this.endedIterNext,
+				this.iterNextTime);
 		this.keyMayExistGetter = new DBColumnKeyMayExistGetter();
 	}
 
 	/**
 	 * This method should not modify or move the writerIndex/readerIndex of the key
 	 */
-	static AbstractSlice<?> setIterateBound(ReadOptions readOpts, IterateBound boundType, Buf key) {
+	static void setIterateBound(LLReadOptions readOpts, IterateBound boundType, Buf key) {
 		requireNonNull(key);
-		AbstractSlice<?> slice;
+		LLSlice slice;
-		slice = new Slice(requireNonNull(LLUtils.asArray(key)));
+		slice = LLSlice.of(requireNonNull(LLUtils.asArray(key)));
 		if (boundType == IterateBound.LOWER) {
 			readOpts.setIterateLowerBound(slice);
 		} else {
 			readOpts.setIterateUpperBound(slice);
 		}
-		return slice;
-	}
-
-	static Slice newEmptyReleasableSlice() {
-		var arr = new byte[0];
-
-		return new Slice(arr);
 	}
 
 	/**
@@ -251,7 +250,7 @@ public sealed abstract class AbstractRocksDBColumn<T extends RocksDB> implements
 	 */
 	@Override
 	@NotNull
-	public RocksIteratorObj newRocksIterator(ReadOptions readOptions, LLRange range, boolean reverse)
+	public RocksIteratorObj newRocksIterator(LLReadOptions readOptions, LLRange range, boolean reverse)
 			throws RocksDBException {
 		assert !LLUtils.isInNonBlockingThread() : "Called getRocksIterator in a nonblocking thread";
 		var rocksIterator = this.newIterator(readOptions, range.getMin(), range.getMax());
@@ -297,8 +296,13 @@ public sealed abstract class AbstractRocksDBColumn<T extends RocksDB> implements
 		RocksDBUtils.ensureOwned(rocksObject);
 	}
 
+
+	protected void ensureOwned(SimpleResource simpleResource) {
+		RocksDBUtils.ensureOwned(simpleResource);
+	}
+
 	@Override
-	public @Nullable Buf get(@NotNull ReadOptions readOptions, Buf key) throws RocksDBException {
+	public @Nullable Buf get(@NotNull LLReadOptions readOptions, Buf key) throws RocksDBException {
 		var closeReadLock = closeLock.readLock();
 		try {
 			ensureOpen();
@@ -310,21 +314,21 @@ public sealed abstract class AbstractRocksDBColumn<T extends RocksDB> implements
 	}
 
 	@Override
-	public void put(@NotNull WriteOptions writeOptions, Buf key, Buf value) throws RocksDBException {
+	public void put(@NotNull LLWriteOptions writeOptions, Buf key, Buf value) throws RocksDBException {
 		var closeReadLock = closeLock.readLock();
 		try {
 			ensureOpen();
 			ensureOwned(writeOptions);
 			this.keyBufferSize.record(key.size());
 			this.writeValueBufferSize.record(value.size());
-			db.put(cfh, writeOptions, LLUtils.asArray(key), LLUtils.asArray(value));
+			db.put(cfh, writeOptions.getUnsafe(), LLUtils.asArray(key), LLUtils.asArray(value));
 		} finally {
 			closeLock.unlockRead(closeReadLock);
 		}
 	}
 
 	@Override
-	public boolean exists(@NotNull ReadOptions readOptions, Buf key) throws RocksDBException {
+	public boolean exists(@NotNull LLReadOptions readOptions, Buf key) throws RocksDBException {
 		var closeReadLock = closeLock.readLock();
 		try {
 			ensureOpen();
@@ -333,12 +337,12 @@ public sealed abstract class AbstractRocksDBColumn<T extends RocksDB> implements
 			byte[] keyBytes = LLUtils.asArray(key);
 			Holder<byte[]> data = new Holder<>();
 			boolean mayExistHit = false;
-			if (db.keyMayExist(cfh, readOptions, keyBytes, data)) {
+			if (db.keyMayExist(cfh, readOptions.getUnsafe(), keyBytes, data)) {
 				mayExistHit = true;
 				if (data.getValue() != null) {
 					size = data.getValue().length;
 				} else {
-					size = db.get(cfh, readOptions, keyBytes, NO_DATA);
+					size = db.get(cfh, readOptions.getUnsafe(), keyBytes, NO_DATA);
 				}
 			}
 			boolean found = size != RocksDB.NOT_FOUND;
@@ -358,46 +362,46 @@ public sealed abstract class AbstractRocksDBColumn<T extends RocksDB> implements
 	}
 
 	@Override
-	public boolean mayExists(@NotNull ReadOptions readOptions, Buf key) {
+	public boolean mayExists(@NotNull LLReadOptions readOptions, Buf key) {
 		var closeReadLock = closeLock.readLock();
 		try {
 			ensureOpen();
 			ensureOwned(readOptions);
 			byte[] keyBytes = LLUtils.asArray(key);
-			return db.keyMayExist(cfh, readOptions, keyBytes, null);
+			return db.keyMayExist(cfh, readOptions.getUnsafe(), keyBytes, null);
 		} finally {
 			closeLock.unlockRead(closeReadLock);
 		}
 	}
 
 	@Override
-	public void delete(WriteOptions writeOptions, Buf key) throws RocksDBException {
+	public void delete(LLWriteOptions writeOptions, Buf key) throws RocksDBException {
 		var closeReadLock = closeLock.readLock();
 		try {
 			ensureOpen();
 			ensureOwned(writeOptions);
 			keyBufferSize.record(key.size());
-			db.delete(cfh, writeOptions, LLUtils.asArray(key));
+			db.delete(cfh, writeOptions.getUnsafe(), LLUtils.asArray(key));
 		} finally {
 			closeLock.unlockRead(closeReadLock);
 		}
 	}
 
 	@Override
-	public void delete(WriteOptions writeOptions, byte[] key) throws RocksDBException {
+	public void delete(LLWriteOptions writeOptions, byte[] key) throws RocksDBException {
 		var closeReadLock = closeLock.readLock();
 		try {
 			ensureOpen();
 			ensureOwned(writeOptions);
 			keyBufferSize.record(key.length);
-			db.delete(cfh, writeOptions, key);
+			db.delete(cfh, writeOptions.getUnsafe(), key);
 		} finally {
 			closeLock.unlockRead(closeReadLock);
 		}
 	}
 
 	@Override
-	public List<byte[]> multiGetAsList(ReadOptions readOptions, List<byte[]> keys) throws RocksDBException {
+	public List<byte[]> multiGetAsList(LLReadOptions readOptions, List<byte[]> keys) throws RocksDBException {
 		var closeReadLock = closeLock.readLock();
 		try {
 			ensureOpen();
@@ -406,7 +410,7 @@ public sealed abstract class AbstractRocksDBColumn<T extends RocksDB> implements
 				keyBufferSize.record(key.length);
 			}
 			var columnFamilyHandles = new RepeatedElementList<>(cfh, keys.size());
-			return db.multiGetAsList(readOptions, columnFamilyHandles, keys);
+			return db.multiGetAsList(readOptions.getUnsafe(), columnFamilyHandles, keys);
 		} finally {
 			closeLock.unlockRead(closeReadLock);
 		}
@@ -480,13 +484,13 @@ public sealed abstract class AbstractRocksDBColumn<T extends RocksDB> implements
 	}
 
 	@Override
-	public void write(WriteOptions writeOptions, WriteBatch writeBatch) throws RocksDBException {
+	public void write(LLWriteOptions writeOptions, WriteBatch writeBatch) throws RocksDBException {
 		var closeReadLock = closeLock.readLock();
 		try {
 			ensureOpen();
 			ensureOwned(writeOptions);
 			ensureOwned(writeBatch);
-			db.write(writeOptions, writeBatch);
+			db.write(writeOptions.getUnsafe(), writeBatch);
 		} finally {
 			closeLock.unlockRead(closeReadLock);
 		}
@@ -497,12 +501,12 @@ public sealed abstract class AbstractRocksDBColumn<T extends RocksDB> implements
 	 */
 	protected abstract boolean commitOptimistically(Transaction tx) throws RocksDBException;
 
-	protected abstract Transaction beginTransaction(@NotNull WriteOptions writeOptions,
+	protected abstract Transaction beginTransaction(@NotNull LLWriteOptions writeOptions,
 			TransactionOptions txOpts);
 
 	@Override
-	public final @NotNull UpdateAtomicResult updateAtomic(@NotNull ReadOptions readOptions,
+	public final @NotNull UpdateAtomicResult updateAtomic(@NotNull LLReadOptions readOptions,
-			@NotNull WriteOptions writeOptions,
+			@NotNull LLWriteOptions writeOptions,
 			Buf key,
 			SerializationFunction<@Nullable Buf, @Nullable Buf> updater,
 			UpdateAtomicResultMode returnMode) {
@@ -540,65 +544,24 @@ public sealed abstract class AbstractRocksDBColumn<T extends RocksDB> implements
 		timer.record(duration, TimeUnit.NANOSECONDS);
 	}
 
-	protected abstract @NotNull UpdateAtomicResult updateAtomicImpl(@NotNull ReadOptions readOptions,
+	protected abstract @NotNull UpdateAtomicResult updateAtomicImpl(@NotNull LLReadOptions readOptions,
-			@NotNull WriteOptions writeOptions,
+			@NotNull LLWriteOptions writeOptions,
 			Buf key,
 			SerializationFunction<@Nullable Buf, @Nullable Buf> updater,
 			UpdateAtomicResultMode returnMode);
 
 	@Override
 	@NotNull
-	public RocksIteratorObj newIterator(@NotNull ReadOptions readOptions,
+	public RocksIteratorObj newIterator(@NotNull LLReadOptions readOptions,
 			@Nullable Buf min,
 			@Nullable Buf max) {
 		var closeReadLock = closeLock.readLock();
 		try {
 			ensureOpen();
 			ensureOwned(readOptions);
-			AbstractSlice<?> sliceMin;
+			setIterateBound(readOptions, IterateBound.LOWER, min);
-			AbstractSlice<?> sliceMax;
+			setIterateBound(readOptions, IterateBound.UPPER, max);
-			if (min != null) {
+			return readOptions.newIterator(db, cfh, iteratorMetrics);
-				sliceMin = setIterateBound(readOptions, IterateBound.LOWER, min);
-			} else {
-				sliceMin = null;
-			}
-			try {
-				if (max != null) {
-					sliceMax = setIterateBound(readOptions, IterateBound.UPPER, max);
-				} else {
-					sliceMax = null;
-				}
-				try {
-					var it = db.newIterator(cfh, readOptions);
-					try {
-						return new RocksIteratorObj(it,
-								sliceMin,
-								sliceMax,
-								min,
-								max,
-								this.startedIterSeek,
-								this.endedIterSeek,
-								this.iterSeekTime,
-								this.startedIterNext,
-								this.endedIterNext,
-								this.iterNextTime
-						);
-					} catch (Throwable ex) {
-						it.close();
-						throw ex;
-					}
-				} catch (Throwable ex) {
-					if (sliceMax != null) {
-						sliceMax.close();
-					}
-					throw ex;
-				}
-			} catch (Throwable ex) {
-				if (sliceMin != null) {
-					sliceMin.close();
-				}
-				throw ex;
-			}
 		} finally {
 			closeLock.unlockRead(closeReadLock);
 		}
@@ -651,23 +614,23 @@ public sealed abstract class AbstractRocksDBColumn<T extends RocksDB> implements
 	private class DBColumnKeyMayExistGetter extends KeyMayExistGetter {
 
 		@Override
-		protected KeyMayExist keyMayExist(ReadOptions readOptions, ByteBuffer key, ByteBuffer value) {
+		protected KeyMayExist keyMayExist(LLReadOptions readOptions, ByteBuffer key, ByteBuffer value) {
-			return db.keyMayExist(cfh, readOptions, key, value);
+			return db.keyMayExist(cfh, readOptions.getUnsafe(), key, value);
 		}
 
 		@Override
-		protected boolean keyMayExist(ReadOptions readOptions, byte[] key, @Nullable Holder<byte[]> valueHolder) {
+		protected boolean keyMayExist(LLReadOptions readOptions, byte[] key, @Nullable Holder<byte[]> valueHolder) {
-			return db.keyMayExist(cfh, readOptions, key, valueHolder);
+			return db.keyMayExist(cfh, readOptions.getUnsafe(), key, valueHolder);
 		}
 
 		@Override
-		protected int get(ReadOptions readOptions, ByteBuffer key, ByteBuffer value) throws RocksDBException {
+		protected int get(LLReadOptions readOptions, ByteBuffer key, ByteBuffer value) throws RocksDBException {
-			return db.get(cfh, readOptions, key, value);
+			return db.get(cfh, readOptions.getUnsafe(), key, value);
 		}
 
 		@Override
-		protected byte[] get(ReadOptions readOptions, byte[] key) throws RocksDBException, IllegalArgumentException {
+		protected byte[] get(LLReadOptions readOptions, byte[] key) throws RocksDBException, IllegalArgumentException {
-			return db.get(cfh, readOptions, key);
+			return db.get(cfh, readOptions.getUnsafe(), key);
 		}
 
 		@Override

src/main/java/it/cavallium/dbengine/database/disk/CappedWriteBatch.java

@@ -3,6 +3,7 @@ package it.cavallium.dbengine.database.disk;
 import static it.cavallium.dbengine.database.LLUtils.asArray;
 
 import it.cavallium.buffer.Buf;
+import it.cavallium.dbengine.database.disk.rocksdb.LLWriteOptions;
 import java.nio.ByteBuffer;
 import org.rocksdb.ColumnFamilyHandle;
 import org.rocksdb.RocksDBException;
@@ -13,7 +14,7 @@ public class CappedWriteBatch extends WriteBatch {
 
 	private final RocksDBColumn db;
 	private final int cap;
-	private final WriteOptions writeOptions;
+	private final LLWriteOptions writeOptions;
 
 	/**
 	 * @param db
@@ -23,7 +24,7 @@ public class CappedWriteBatch extends WriteBatch {
 			int cap,
 			int reservedWriteBatchSize,
 			long maxWriteBatchSize,
-			WriteOptions writeOptions) {
+			LLWriteOptions writeOptions) {
 		super(reservedWriteBatchSize);
 		this.db = db;
 		this.cap = cap;

src/main/java/it/cavallium/dbengine/database/disk/IteratorMetrics.java

@@ -0,0 +1,7 @@
+package it.cavallium.dbengine.database.disk;
+
+import io.micrometer.core.instrument.Counter;
+import io.micrometer.core.instrument.Timer;
+
+public record IteratorMetrics(Counter startedIterSeek, Counter endedIterSeek, Timer iterSeekTime,
+															Counter startedIterNext, Counter endedIterNext, Timer iterNextTime) {}

src/main/java/it/cavallium/dbengine/database/disk/KeyMayExistGetter.java

@@ -6,6 +6,7 @@ import static java.util.Objects.requireNonNull;
 
 import it.cavallium.buffer.Buf;
 import it.cavallium.dbengine.database.LLUtils;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
 import java.nio.ByteBuffer;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -32,12 +33,12 @@ public abstract class KeyMayExistGetter {
 	public KeyMayExistGetter() {
 	}
 
-	public final @Nullable Buf get(@NotNull ReadOptions readOptions, Buf key) throws RocksDBException {
+	public final @Nullable Buf get(@NotNull LLReadOptions readOptions, Buf key) throws RocksDBException {
 		recordKeyBufferSize(key.size());
 		return getHeap(readOptions, key);
 	}
 
-	private Buf getHeap(ReadOptions readOptions, Buf key) throws RocksDBException {
+	private Buf getHeap(LLReadOptions readOptions, Buf key) throws RocksDBException {
 		int readAttemptsCount = 0;
 		try {
 			byte[] keyArray = LLUtils.asArray(key);
@@ -73,15 +74,15 @@ public abstract class KeyMayExistGetter {
 		}
 	}
 
-	protected abstract KeyMayExist keyMayExist(final ReadOptions readOptions, final ByteBuffer key, final ByteBuffer value);
+	protected abstract KeyMayExist keyMayExist(final LLReadOptions readOptions, final ByteBuffer key, final ByteBuffer value);
 
-	protected abstract boolean keyMayExist(final ReadOptions readOptions,
+	protected abstract boolean keyMayExist(final LLReadOptions readOptions,
 			final byte[] key,
 			@Nullable final Holder<byte[]> valueHolder);
 
-	protected abstract int get(final ReadOptions opt, final ByteBuffer key, final ByteBuffer value) throws RocksDBException;
+	protected abstract int get(final LLReadOptions opt, final ByteBuffer key, final ByteBuffer value) throws RocksDBException;
 
-	protected abstract byte[] get(final ReadOptions opt, final byte[] key) throws RocksDBException, IllegalArgumentException;
+	protected abstract byte[] get(final LLReadOptions opt, final byte[] key) throws RocksDBException, IllegalArgumentException;
 
 	protected abstract void recordReadValueNotFoundWithMayExistBloomBufferSize(int value);
 

src/main/java/it/cavallium/dbengine/database/disk/LLLocalDictionary.java

@@ -30,6 +30,9 @@ import it.cavallium.dbengine.database.OptionalBuf;
 import it.cavallium.dbengine.database.SerializedKey;
 import it.cavallium.dbengine.database.UpdateMode;
 import it.cavallium.dbengine.database.UpdateReturnMode;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
+import it.cavallium.dbengine.database.disk.rocksdb.LLSlice;
+import it.cavallium.dbengine.database.disk.rocksdb.LLWriteOptions;
 import it.cavallium.dbengine.database.serialization.KVSerializationFunction;
 import it.cavallium.dbengine.database.serialization.SerializationFunction;
 import it.cavallium.dbengine.rpc.current.data.DatabaseOptions;
@@ -68,7 +71,7 @@ public class LLLocalDictionary implements LLDictionary {
 	static final long MAX_WRITE_BATCH_SIZE = 1024L * 1024L * 1024L; // 1GiB
 	static final int CAPPED_WRITE_BATCH_CAP = 50000; // 50K operations
 	static final int MULTI_GET_WINDOW = 16;
-	private static final ReadOptions EMPTY_READ_OPTIONS = LLUtils.ALLOW_STATIC_OPTIONS ? new ReadOptions() : null;
+	private static final LLReadOptions EMPTY_READ_OPTIONS = LLUtils.ALLOW_STATIC_OPTIONS ? new LLReadOptions() : null;
 	static final boolean PREFER_AUTO_SEEK_BOUND = false;
 	/**
 	 * It used to be false,
@@ -195,33 +198,33 @@ public class LLLocalDictionary implements LLDictionary {
 	}
 
 	@NotNull
-	private ReadOptions generateReadOptionsOrStatic(LLSnapshot snapshot) {
+	private LLReadOptions generateReadOptionsOrStatic(LLSnapshot snapshot) {
 		var resolved = generateReadOptions(snapshot != null ? snapshotResolver.apply(snapshot) : null, true);
 		if (resolved != null) {
 			return resolved;
 		} else {
-			return new ReadOptions();
+			return new LLReadOptions();
 		}
 	}
 
 	@Nullable
-	private ReadOptions generateReadOptionsOrNull(LLSnapshot snapshot) {
+	private LLReadOptions generateReadOptionsOrNull(LLSnapshot snapshot) {
 		return generateReadOptions(snapshot != null ? snapshotResolver.apply(snapshot) : null, false);
 	}
 
 	@NotNull
-	private ReadOptions generateReadOptionsOrNew(LLSnapshot snapshot) {
+	private LLReadOptions generateReadOptionsOrNew(LLSnapshot snapshot) {
 		var result = generateReadOptions(snapshot != null ? snapshotResolver.apply(snapshot) : null, false);
 		if (result != null) {
 			return result;
 		} else {
-			return new ReadOptions();
+			return new LLReadOptions();
 		}
 	}
 
-	private ReadOptions generateReadOptions(Snapshot snapshot, boolean orStaticOpts) {
+	private LLReadOptions generateReadOptions(Snapshot snapshot, boolean orStaticOpts) {
 		if (snapshot != null) {
-			return new ReadOptions().setSnapshot(snapshot);
+			return new LLReadOptions().setSnapshot(snapshot);
 		} else if (ALLOW_STATIC_OPTIONS && orStaticOpts) {
 			return EMPTY_READ_OPTIONS;
 		} else {
@@ -337,7 +340,7 @@ public class LLLocalDictionary implements LLDictionary {
 			logger.trace(MARKER_ROCKSDB, "Writing {}: {}", varargs);
 		}
 		startedPut.increment();
-		try (var writeOptions = new WriteOptions()) {
+		try (var writeOptions = new LLWriteOptions()) {
 			putTime.recordCallable(() -> {
 				db.put(writeOptions, key, value);
 				return null;
@@ -376,7 +379,7 @@ public class LLLocalDictionary implements LLDictionary {
 		try {
 			var readOptions = generateReadOptionsOrStatic(null);
 			startedUpdates.increment();
-			try (var writeOptions = new WriteOptions()) {
+			try (var writeOptions = new LLWriteOptions()) {
 				result = updateTime.recordCallable(() -> db.updateAtomic(readOptions, writeOptions, key, updater, returnMode));
 			} finally {
 				endedUpdates.increment();
@@ -413,7 +416,7 @@ public class LLLocalDictionary implements LLDictionary {
 		try {
 			var readOptions = generateReadOptionsOrStatic(null);
 			startedUpdates.increment();
-			try (var writeOptions = new WriteOptions()) {
+			try (var writeOptions = new LLWriteOptions()) {
 				result = updateTime.recordCallable(() ->
 						(UpdateAtomicResultDelta) db.updateAtomic(readOptions, writeOptions, key, updater, DELTA));
 			} finally {
@@ -437,7 +440,7 @@ public class LLLocalDictionary implements LLDictionary {
 		try {
 			logger.trace(MARKER_ROCKSDB, "Deleting {}", () -> toStringSafe(key));
 			startedRemove.increment();
-			try (var writeOptions = new WriteOptions()) {
+			try (var writeOptions = new LLWriteOptions()) {
 				removeTime.recordCallable(() -> {
 					db.delete(writeOptions, key);
 					return null;
@@ -489,7 +492,7 @@ public class LLLocalDictionary implements LLDictionary {
 		collectOn(ROCKSDB_POOL,
 				batches(entries, Math.min(MULTI_GET_WINDOW, CAPPED_WRITE_BATCH_CAP)),
 				executing(entriesWindow -> {
-					try (var writeOptions = new WriteOptions()) {
+					try (var writeOptions = new LLWriteOptions()) {
 						assert !LLUtils.isInNonBlockingThread() : "Called putMulti in a nonblocking thread";
 						if (USE_WRITE_BATCHES_IN_PUT_MULTI) {
 							try (var batch = new CappedWriteBatch(db,
@@ -521,7 +524,7 @@ public class LLLocalDictionary implements LLDictionary {
 		record MappedInput<K>(K key, Buf serializedKey, OptionalBuf mapped) {}
 		return batches(keys, Math.min(MULTI_GET_WINDOW, CAPPED_WRITE_BATCH_CAP))
 				.flatMap(entriesWindow -> {
-					try (var writeOptions = new WriteOptions()) {
+					try (var writeOptions = new LLWriteOptions()) {
 						if (LLUtils.isInNonBlockingThread()) {
 							throw new UnsupportedOperationException("Called updateMulti in a nonblocking thread");
 						}
@@ -761,7 +764,7 @@ public class LLLocalDictionary implements LLDictionary {
 	@Override
 	public void setRange(LLRange range, Stream<LLEntry> entries, boolean smallRange) {
 		if (USE_WINDOW_IN_SET_RANGE) {
-			try (var writeOptions = new WriteOptions()) {
+			try (var writeOptions = new LLWriteOptions()) {
 				assert !LLUtils.isInNonBlockingThread() : "Called setRange in a nonblocking thread";
 				if (!USE_WRITE_BATCH_IN_SET_RANGE_DELETE || !USE_WRITE_BATCHES_IN_SET_RANGE) {
 					try (var opts = LLUtils.generateCustomReadOptions(null, true, isBoundedRange(range), smallRange)) {
@@ -807,7 +810,7 @@ public class LLLocalDictionary implements LLDictionary {
 			}
 
 			collectOn(ROCKSDB_POOL, batches(entries, MULTI_GET_WINDOW), executing(entriesList -> {
-				try (var writeOptions = new WriteOptions()) {
+				try (var writeOptions = new LLWriteOptions()) {
 					if (!USE_WRITE_BATCHES_IN_SET_RANGE) {
 						for (LLEntry entry : entriesList) {
 							db.put(writeOptions, entry.getKey(), entry.getValue());
@@ -843,7 +846,7 @@ public class LLLocalDictionary implements LLDictionary {
 				throw new UnsupportedOperationException("Can't use write batches in setRange without window. Please fix the parameters");
 			}
 			collectOn(ROCKSDB_POOL, this.getRange(null, range, false, smallRange), executing(oldValue -> {
-				try (var writeOptions = new WriteOptions()) {
+				try (var writeOptions = new LLWriteOptions()) {
 					db.delete(writeOptions, oldValue.getKey());
 				} catch (RocksDBException ex) {
 					throw new CompletionException(new DBException("Failed to write range", ex));
@@ -878,7 +881,7 @@ public class LLLocalDictionary implements LLDictionary {
 	public void clear() {
 		assert !LLUtils.isInNonBlockingThread() : "Called clear in a nonblocking thread";
 		boolean shouldCompactLater = false;
-		try (var writeOptions = new WriteOptions();
+		try (var writeOptions = new LLWriteOptions();
 				var readOpts = LLUtils.generateCustomReadOptions(null, false, false, false)) {
 			if (VERIFY_CHECKSUMS_WHEN_NOT_NEEDED) {
 				readOpts.setVerifyChecksums(true);
@@ -1088,16 +1091,16 @@ public class LLLocalDictionary implements LLDictionary {
 										: LLUtils.LEXICONOGRAPHIC_ITERATION_SEEKS[idx + 1]
 						)).map(range -> {
 							long partialCount = 0;
-							try (var rangeReadOpts = new ReadOptions(readOpts)) {
+							try (var rangeReadOpts = readOpts.copy()) {
-								Slice sliceBegin;
+								LLSlice sliceBegin;
 								if (range.getKey() != null) {
-									sliceBegin = new Slice(range.getKey());
+									sliceBegin = LLSlice.of(range.getKey());
 								} else {
 									sliceBegin = null;
 								}
-								Slice sliceEnd;
+								LLSlice sliceEnd;
 								if (range.getValue() != null) {
-									sliceEnd = new Slice(range.getValue());
+									sliceEnd = LLSlice.of(range.getValue());
 								} else {
 									sliceEnd = null;
 								}
@@ -1147,8 +1150,8 @@ public class LLLocalDictionary implements LLDictionary {
 	@Override
 	public LLEntry removeOne(LLRange range) {
 		assert !LLUtils.isInNonBlockingThread() : "Called removeOne in a nonblocking thread";
-		try (var readOpts = new ReadOptions();
+		try (var readOpts = new LLReadOptions();
-				var writeOpts = new WriteOptions()) {
+				var writeOpts = new LLWriteOptions()) {
 			try (var rocksIterator = db.newIterator(readOpts, range.getMin(), range.getMax())) {
 				if (!LLLocalDictionary.PREFER_AUTO_SEEK_BOUND && range.hasMin()) {
 					rocksIterator.seekTo(range.getMin());

src/main/java/it/cavallium/dbengine/database/disk/LLLocalEntryReactiveRocksIterator.java

@@ -3,6 +3,7 @@ package it.cavallium.dbengine.database.disk;
 import it.cavallium.buffer.Buf;
 import it.cavallium.dbengine.database.LLEntry;
 import it.cavallium.dbengine.database.LLRange;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
 import java.util.function.Supplier;
 import org.rocksdb.ReadOptions;
 
@@ -10,7 +11,7 @@ public class LLLocalEntryReactiveRocksIterator extends LLLocalReactiveRocksItera
 
 	public LLLocalEntryReactiveRocksIterator(RocksDBColumn db,
 			LLRange range,
-			Supplier<ReadOptions> readOptions,
+			Supplier<LLReadOptions> readOptions,
 			boolean reverse,
 			boolean smallRange) {
 		super(db, range, readOptions, true, reverse, smallRange);

src/main/java/it/cavallium/dbengine/database/disk/LLLocalGroupedEntryReactiveRocksIterator.java

@@ -3,6 +3,7 @@ package it.cavallium.dbengine.database.disk;
 import it.cavallium.buffer.Buf;
 import it.cavallium.dbengine.database.LLEntry;
 import it.cavallium.dbengine.database.LLRange;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
 import java.util.function.Supplier;
 import org.rocksdb.ReadOptions;
 
@@ -11,7 +12,7 @@ public class LLLocalGroupedEntryReactiveRocksIterator extends LLLocalGroupedReac
 	public LLLocalGroupedEntryReactiveRocksIterator(RocksDBColumn db,
 			int prefixLength,
 			LLRange range,
-			Supplier<ReadOptions> readOptions,
+			Supplier<LLReadOptions> readOptions,
 			boolean smallRange) {
 		super(db, prefixLength, range, readOptions, true, true, smallRange);
 	}

src/main/java/it/cavallium/dbengine/database/disk/LLLocalGroupedKeyReactiveRocksIterator.java

@@ -2,6 +2,7 @@ package it.cavallium.dbengine.database.disk;
 
 import it.cavallium.buffer.Buf;
 import it.cavallium.dbengine.database.LLRange;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
 import java.util.function.Supplier;
 import org.rocksdb.ReadOptions;
 
@@ -10,7 +11,7 @@ public class LLLocalGroupedKeyReactiveRocksIterator extends LLLocalGroupedReacti
 	public LLLocalGroupedKeyReactiveRocksIterator(RocksDBColumn db,
 			int prefixLength,
 			LLRange range,
-			Supplier<ReadOptions> readOptions,
+			Supplier<LLReadOptions> readOptions,
 			boolean smallRange) {
 		super(db, prefixLength, range, readOptions, true, false, smallRange);
 	}

src/main/java/it/cavallium/dbengine/database/disk/LLLocalGroupedReactiveRocksIterator.java

@@ -7,6 +7,7 @@ import static it.cavallium.dbengine.database.LLUtils.isBoundedRange;
 import it.cavallium.buffer.Buf;
 import it.cavallium.dbengine.database.LLRange;
 import it.cavallium.dbengine.database.LLUtils;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
 import it.cavallium.dbengine.database.disk.rocksdb.RocksIteratorObj;
 import it.cavallium.dbengine.utils.DBException;
 import it.cavallium.dbengine.utils.StreamUtils;
@@ -30,7 +31,7 @@ public abstract class LLLocalGroupedReactiveRocksIterator<T> {
 	private final RocksDBColumn db;
 	private final int prefixLength;
 	private final LLRange range;
-	private final Supplier<ReadOptions> readOptions;
+	private final Supplier<LLReadOptions> readOptions;
 	private final boolean canFillCache;
 	private final boolean readValues;
 	private final boolean smallRange;
@@ -38,14 +39,14 @@ public abstract class LLLocalGroupedReactiveRocksIterator<T> {
 	public LLLocalGroupedReactiveRocksIterator(RocksDBColumn db,
 			int prefixLength,
 			LLRange range,
-			Supplier<ReadOptions> readOptions,
+			Supplier<LLReadOptions> readOptions,
 			boolean canFillCache,
 			boolean readValues,
 			boolean smallRange) {
 		this.db = db;
 		this.prefixLength = prefixLength;
 		this.range = range;
-		this.readOptions = readOptions != null ? readOptions : ReadOptions::new;
+		this.readOptions = readOptions != null ? readOptions : LLReadOptions::new;
 		this.canFillCache = canFillCache;
 		this.readValues = readValues;
 		this.smallRange = smallRange;

src/main/java/it/cavallium/dbengine/database/disk/LLLocalKeyPrefixReactiveRocksIterator.java

@@ -10,6 +10,7 @@ import com.google.common.collect.Streams;
 import it.cavallium.buffer.Buf;
 import it.cavallium.dbengine.database.LLRange;
 import it.cavallium.dbengine.database.LLUtils;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
 import it.cavallium.dbengine.utils.DBException;
 import it.cavallium.dbengine.utils.StreamUtils;
 import java.io.IOException;
@@ -29,20 +30,20 @@ public class LLLocalKeyPrefixReactiveRocksIterator {
 	private final RocksDBColumn db;
 	private final int prefixLength;
 	private final LLRange range;
-	private final Supplier<ReadOptions> readOptions;
+	private final Supplier<LLReadOptions> readOptions;
 	private final boolean canFillCache;
 	private final boolean smallRange;
 
 	public LLLocalKeyPrefixReactiveRocksIterator(RocksDBColumn db,
 			int prefixLength,
 			LLRange range,
-			Supplier<ReadOptions> readOptions,
+			Supplier<LLReadOptions> readOptions,
 			boolean canFillCache,
 			boolean smallRange) {
 		this.db = db;
 		this.prefixLength = prefixLength;
 		this.range = range;
-		this.readOptions = readOptions != null ? readOptions : ReadOptions::new;
+		this.readOptions = readOptions != null ? readOptions : LLReadOptions::new;
 		this.canFillCache = canFillCache;
 		this.smallRange = smallRange;
 	}

src/main/java/it/cavallium/dbengine/database/disk/LLLocalKeyReactiveRocksIterator.java

@@ -2,6 +2,7 @@ package it.cavallium.dbengine.database.disk;
 
 import it.cavallium.buffer.Buf;
 import it.cavallium.dbengine.database.LLRange;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
 import java.util.function.Supplier;
 import org.rocksdb.ReadOptions;
 
@@ -9,7 +10,7 @@ public class LLLocalKeyReactiveRocksIterator extends LLLocalReactiveRocksIterato
 
 	public LLLocalKeyReactiveRocksIterator(RocksDBColumn db,
 			LLRange rangeMono,
-			Supplier<ReadOptions> readOptions,
+			Supplier<LLReadOptions> readOptions,
 			boolean reverse,
 			boolean smallRange) {
 		super(db, rangeMono, readOptions, false, reverse, smallRange);

src/main/java/it/cavallium/dbengine/database/disk/LLLocalKeyValueDatabase.java

@@ -98,7 +98,7 @@ import org.rocksdb.util.SizeUnit;
 public class LLLocalKeyValueDatabase extends Backuppable implements LLKeyValueDatabase {
 
 	private static final boolean DELETE_LOG_FILES = false;
-	private static final boolean FOLLOW_ROCKSDB_OPTIMIZATIONS = true;
+	private static final boolean FOLLOW_ROCKSDB_OPTIMIZATIONS = false;
 	private static final boolean USE_CLOCK_CACHE
 			= Boolean.parseBoolean(System.getProperty("it.cavallium.dbengine.clockcache.enable", "false"));
 

src/main/java/it/cavallium/dbengine/database/disk/LLLocalMigrationReactiveRocksIterator.java

@@ -7,6 +7,7 @@ import it.cavallium.buffer.Buf;
 import it.cavallium.dbengine.database.LLEntry;
 import it.cavallium.dbengine.database.LLRange;
 import it.cavallium.dbengine.database.LLUtils;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
 import it.cavallium.dbengine.database.disk.rocksdb.RocksIteratorObj;
 import it.cavallium.dbengine.utils.DBException;
 import java.io.IOException;
@@ -22,11 +23,11 @@ public final class LLLocalMigrationReactiveRocksIterator {
 
 	private final RocksDBColumn db;
 	private final LLRange range;
-	private final Supplier<ReadOptions> readOptions;
+	private final Supplier<LLReadOptions> readOptions;
 
 	public LLLocalMigrationReactiveRocksIterator(RocksDBColumn db,
 			LLRange range,
-			Supplier<ReadOptions> readOptions) {
+			Supplier<LLReadOptions> readOptions) {
 		this.db = db;
 		this.range = range;
 		this.readOptions = readOptions;

src/main/java/it/cavallium/dbengine/database/disk/LLLocalReactiveRocksIterator.java

@@ -8,6 +8,7 @@ import static it.cavallium.dbengine.utils.StreamUtils.streamWhileNonNull;
 import it.cavallium.buffer.Buf;
 import it.cavallium.dbengine.database.LLRange;
 import it.cavallium.dbengine.database.LLUtils;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
 import it.cavallium.dbengine.database.disk.rocksdb.RocksIteratorObj;
 import it.cavallium.dbengine.utils.DBException;
 import java.io.IOException;
@@ -27,20 +28,20 @@ public abstract class LLLocalReactiveRocksIterator<T> {
 
 	private final RocksDBColumn db;
 	private final LLRange range;
-	private final Supplier<ReadOptions> readOptions;
+	private final Supplier<LLReadOptions> readOptions;
 	private final boolean readValues;
 	private final boolean reverse;
 	private final boolean smallRange;
 
 	public LLLocalReactiveRocksIterator(RocksDBColumn db,
 			LLRange range,
-			Supplier<ReadOptions> readOptions,
+			Supplier<LLReadOptions> readOptions,
 			boolean readValues,
 			boolean reverse,
 			boolean smallRange) {
 		this.db = db;
 		this.range = range;
-		this.readOptions = readOptions != null ? readOptions : ReadOptions::new;
+		this.readOptions = readOptions != null ? readOptions : LLReadOptions::new;
 		this.readValues = readValues;
 		this.reverse = reverse;
 		this.smallRange = smallRange;

src/main/java/it/cavallium/dbengine/database/disk/LLLocalSingleton.java

@@ -9,6 +9,8 @@ import it.cavallium.dbengine.database.LLSingleton;
 import it.cavallium.dbengine.database.LLSnapshot;
 import it.cavallium.dbengine.database.LLUtils;
 import it.cavallium.dbengine.database.UpdateReturnMode;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
+import it.cavallium.dbengine.database.disk.rocksdb.LLWriteOptions;
 import it.cavallium.dbengine.database.serialization.SerializationFunction;
 import it.cavallium.dbengine.utils.DBException;
 import java.io.IOException;
@@ -43,19 +45,20 @@ public class LLLocalSingleton implements LLSingleton {
 		if (LLUtils.isInNonBlockingThread()) {
 			throw new UnsupportedOperationException("Initialized in a nonblocking thread");
 		}
-		try (var readOptions = new ReadOptions();
+		try (var readOptions = new LLReadOptions()) {
-				var writeOptions = new WriteOptions()) {
+			try (var writeOptions = new LLWriteOptions()) {
-			if (defaultValue != null && db.get(readOptions, this.name.asArray(), true) == null) {
+				if (defaultValue != null && db.get(readOptions, this.name.asArray(), true) == null) {
-				db.put(writeOptions, this.name.asArray(), defaultValue);
+					db.put(writeOptions, this.name.asArray(), defaultValue);
+				}
 			}
 		}
 	}
 
-	private ReadOptions generateReadOptions(LLSnapshot snapshot) {
+	private LLReadOptions generateReadOptions(LLSnapshot snapshot) {
 		if (snapshot != null) {
-			return new ReadOptions().setSnapshot(snapshotResolver.apply(snapshot));
+			return new LLReadOptions().setSnapshot(snapshotResolver.apply(snapshot));
 		} else {
-			return new ReadOptions();
+			return new LLReadOptions();
 		}
 	}
 
@@ -74,7 +77,7 @@ public class LLLocalSingleton implements LLSingleton {
 
 	@Override
 	public void set(Buf value) {
-		try (var writeOptions = new WriteOptions()) {
+		try (var writeOptions = new LLWriteOptions()) {
 			if (value == null) {
 				db.delete(writeOptions, name);
 			} else {
@@ -101,8 +104,10 @@ public class LLLocalSingleton implements LLSingleton {
 			case GET_OLD_VALUE -> UpdateAtomicResultMode.PREVIOUS;
 		};
 		UpdateAtomicResult result;
-		try (var readOptions = new ReadOptions(); var writeOptions = new WriteOptions()) {
+		try (var readOptions = new LLReadOptions()) {
-			result = db.updateAtomic(readOptions, writeOptions, name, updater, returnMode);
+			try (var writeOptions = new LLWriteOptions()) {
+				result = db.updateAtomic(readOptions, writeOptions, name, updater, returnMode);
+			}
 		}
 		return switch (updateReturnMode) {
 			case NOTHING -> null;
@@ -117,8 +122,10 @@ public class LLLocalSingleton implements LLSingleton {
 			throw new UnsupportedOperationException("Called update in a nonblocking thread");
 		}
 		UpdateAtomicResult result;
-		try (var readOptions = new ReadOptions(); var writeOptions = new WriteOptions()) {
+		try (var readOptions = new LLReadOptions()) {
-			result = db.updateAtomic(readOptions, writeOptions, name, updater, DELTA);
+			try (var writeOptions = new LLWriteOptions()) {
+				result = db.updateAtomic(readOptions, writeOptions, name, updater, DELTA);
+			}
 		}
 		return ((UpdateAtomicResultDelta) result).delta();
 	}

src/main/java/it/cavallium/dbengine/database/disk/OptimisticRocksDBColumn.java

@@ -7,6 +7,8 @@ import io.micrometer.core.instrument.MeterRegistry;
 import it.cavallium.buffer.Buf;
 import it.cavallium.dbengine.database.LLDelta;
 import it.cavallium.dbengine.database.LLUtils;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
+import it.cavallium.dbengine.database.disk.rocksdb.LLWriteOptions;
 import it.cavallium.dbengine.database.serialization.SerializationFunction;
 import it.cavallium.dbengine.lucene.ExponentialPageLimits;
 import it.cavallium.dbengine.utils.DBException;
@@ -63,19 +65,19 @@ public final class OptimisticRocksDBColumn extends AbstractRocksDBColumn<Optimis
 	}
 
 	@Override
-	protected Transaction beginTransaction(@NotNull WriteOptions writeOptions,
+	protected Transaction beginTransaction(@NotNull LLWriteOptions writeOptions,
 			TransactionOptions txOpts) {
-		return getDb().beginTransaction(writeOptions);
+		return getDb().beginTransaction(writeOptions.getUnsafe());
 	}
 
 	@Override
-	public void write(WriteOptions writeOptions, WriteBatch writeBatch) throws RocksDBException {
+	public void write(LLWriteOptions writeOptions, WriteBatch writeBatch) throws RocksDBException {
-		getDb().write(writeOptions, writeBatch);
+		getDb().write(writeOptions.getUnsafe(), writeBatch);
 	}
 
 	@Override
-	public @NotNull UpdateAtomicResult updateAtomicImpl(@NotNull ReadOptions readOptions,
+	public @NotNull UpdateAtomicResult updateAtomicImpl(@NotNull LLReadOptions readOptions,
-			@NotNull WriteOptions writeOptions,
+			@NotNull LLWriteOptions writeOptions,
 			Buf key,
 			SerializationFunction<@Nullable Buf, @Nullable Buf> updater,
 			UpdateAtomicResultMode returnMode) {
@@ -86,107 +88,108 @@ public final class OptimisticRocksDBColumn extends AbstractRocksDBColumn<Optimis
 			if (LLUtils.isInNonBlockingThread()) {
 				throw new UnsupportedOperationException("Called update in a nonblocking thread");
 			}
-			try (var txOpts = new TransactionOptions();
+			try (var txOpts = new TransactionOptions()) {
-					var tx = beginTransaction(writeOptions, txOpts)) {
+				try (var tx = beginTransaction(writeOptions, txOpts)) {
-				boolean committedSuccessfully;
+					boolean committedSuccessfully;
-				int retries = 0;
+					int retries = 0;
-				ExponentialPageLimits retryTime = null;
+					ExponentialPageLimits retryTime = null;
-				Buf prevData;
+					Buf prevData;
-				Buf newData;
+					Buf newData;
-				boolean changed;
+					boolean changed;
-				do {
+					do {
-					var prevDataArray = tx.getForUpdate(readOptions, cfh, keyArray, true);
+						var prevDataArray = tx.getForUpdate(readOptions.getUnsafe(), cfh, keyArray, true);
-					if (logger.isTraceEnabled()) {
-						logger.trace(MARKER_ROCKSDB,
-								"Reading {}: {} (before update)",
-								LLUtils.toStringSafe(key),
-								LLUtils.toStringSafe(prevDataArray)
-						);
-					}
-					if (prevDataArray != null) {
-						prevData = Buf.wrap(prevDataArray);
-						prevDataArray = null;
-					} else {
-						prevData = null;
-					}
-					if (prevData != null) {
-						prevData.freeze();
-					}
-					try {
-						newData = updater.apply(prevData);
-					} catch (Exception ex) {
-						throw new DBException("Failed to update key " + LLUtils.toStringSafe(key) + ". The previous value was:\n" + LLUtils.toStringSafe(prevData, 8192), ex);
-					}
-					var newDataArray = newData == null ? null : LLUtils.asArray(newData);
-					if (logger.isTraceEnabled()) {
-						logger.trace(MARKER_ROCKSDB,
-								"Updating {}. previous data: {}, updated data: {}",
-								LLUtils.toStringSafe(key),
-								LLUtils.toStringSafe(prevDataArray),
-								LLUtils.toStringSafe(newDataArray)
-						);
-					}
-					if (prevData != null && newData == null) {
-						if (logger.isTraceEnabled()) {
-							logger.trace(MARKER_ROCKSDB, "Deleting {} (after update)", LLUtils.toStringSafe(key));
-						}
-						tx.delete(cfh, keyArray, true);
-						changed = true;
-						committedSuccessfully = commitOptimistically(tx);
-					} else if (newData != null && (prevData == null || !LLUtils.equals(prevData, newData))) {
 						if (logger.isTraceEnabled()) {
 							logger.trace(MARKER_ROCKSDB,
-									"Writing {}: {} (after update)",
+									"Reading {}: {} (before update)",
 									LLUtils.toStringSafe(key),
-									LLUtils.toStringSafe(newData)
+									LLUtils.toStringSafe(prevDataArray)
 							);
 						}
-						tx.put(cfh, keyArray, newDataArray);
+						if (prevDataArray != null) {
-						changed = true;
+							prevData = Buf.wrap(prevDataArray);
-						committedSuccessfully = commitOptimistically(tx);
+							prevDataArray = null;
-					} else {
+						} else {
-						changed = false;
+							prevData = null;
-						committedSuccessfully = true;
+						}
-						tx.rollback();
+						if (prevData != null) {
+							prevData.freeze();
+						}
+						try {
+							newData = updater.apply(prevData);
+						} catch (Exception ex) {
+							throw new DBException("Failed to update key " + LLUtils.toStringSafe(key) + ". The previous value was:\n" + LLUtils.toStringSafe(prevData, 8192), ex);
+						}
+						var newDataArray = newData == null ? null : LLUtils.asArray(newData);
+						if (logger.isTraceEnabled()) {
+							logger.trace(MARKER_ROCKSDB,
+									"Updating {}. previous data: {}, updated data: {}",
+									LLUtils.toStringSafe(key),
+									LLUtils.toStringSafe(prevDataArray),
+									LLUtils.toStringSafe(newDataArray)
+							);
+						}
+						if (prevData != null && newData == null) {
+							if (logger.isTraceEnabled()) {
+								logger.trace(MARKER_ROCKSDB, "Deleting {} (after update)", LLUtils.toStringSafe(key));
+							}
+							tx.delete(cfh, keyArray, true);
+							changed = true;
+							committedSuccessfully = commitOptimistically(tx);
+						} else if (newData != null && (prevData == null || !LLUtils.equals(prevData, newData))) {
+							if (logger.isTraceEnabled()) {
+								logger.trace(MARKER_ROCKSDB,
+										"Writing {}: {} (after update)",
+										LLUtils.toStringSafe(key),
+										LLUtils.toStringSafe(newData)
+								);
+							}
+							tx.put(cfh, keyArray, newDataArray);
+							changed = true;
+							committedSuccessfully = commitOptimistically(tx);
+						} else {
+							changed = false;
+							committedSuccessfully = true;
+							tx.rollback();
+						}
+						if (!committedSuccessfully) {
+							tx.undoGetForUpdate(cfh, keyArray);
+							tx.rollback();
+							retries++;
+
+							if (retries == 1) {
+								retryTime = new ExponentialPageLimits(0, 2, 2000);
+							}
+							long retryNs = 1000000L * retryTime.getPageLimit(retries);
+
+							// +- 30%
+							retryNs = retryNs + ThreadLocalRandom.current().nextLong(-retryNs * 30L / 100L, retryNs * 30L / 100L);
+
+							if (retries >= 5 && retries % 5 == 0 || ALWAYS_PRINT_OPTIMISTIC_RETRIES) {
+								logger.warn(MARKER_ROCKSDB, "Failed optimistic transaction {} (update):"
+										+ " waiting {} ms before retrying for the {} time", LLUtils.toStringSafe(key), retryNs / 1000000d, retries);
+							} else if (logger.isDebugEnabled(MARKER_ROCKSDB)) {
+								logger.debug(MARKER_ROCKSDB, "Failed optimistic transaction {} (update):"
+										+ " waiting {} ms before retrying for the {} time", LLUtils.toStringSafe(key), retryNs / 1000000d, retries);
+							}
+							// Wait for n milliseconds
+							if (retryNs > 0) {
+								LockSupport.parkNanos(retryNs);
+							}
+						}
+					} while (!committedSuccessfully);
+					if (retries > 5) {
+						logger.warn(MARKER_ROCKSDB, "Took {} retries to update key {}", retries, LLUtils.toStringSafe(key));
 					}
-					if (!committedSuccessfully) {
+					recordAtomicUpdateTime(changed, prevData != null, newData != null, initNanoTime);
-						tx.undoGetForUpdate(cfh, keyArray);
+					optimisticAttempts.record(retries);
-						tx.rollback();
+					return switch (returnMode) {
-						retries++;
+						case NOTHING -> RESULT_NOTHING;
-
+						case CURRENT -> new UpdateAtomicResultCurrent(newData);
-						if (retries == 1) {
+						case PREVIOUS -> new UpdateAtomicResultPrevious(prevData);
-							retryTime = new ExponentialPageLimits(0, 2, 2000);
+						case BINARY_CHANGED -> new UpdateAtomicResultBinaryChanged(changed);
-						}
+						case DELTA -> new UpdateAtomicResultDelta(LLDelta.of(prevData, newData));
-						long retryNs = 1000000L * retryTime.getPageLimit(retries);
+					};
-
-						// +- 30%
-						retryNs = retryNs + ThreadLocalRandom.current().nextLong(-retryNs * 30L / 100L, retryNs * 30L / 100L);
-
-						if (retries >= 5 && retries % 5 == 0 || ALWAYS_PRINT_OPTIMISTIC_RETRIES) {
-							logger.warn(MARKER_ROCKSDB, "Failed optimistic transaction {} (update):"
-									+ " waiting {} ms before retrying for the {} time", LLUtils.toStringSafe(key), retryNs / 1000000d, retries);
-						} else if (logger.isDebugEnabled(MARKER_ROCKSDB)) {
-							logger.debug(MARKER_ROCKSDB, "Failed optimistic transaction {} (update):"
-									+ " waiting {} ms before retrying for the {} time", LLUtils.toStringSafe(key), retryNs / 1000000d, retries);
-						}
-						// Wait for n milliseconds
-						if (retryNs > 0) {
-							LockSupport.parkNanos(retryNs);
-						}
-					}
-				} while (!committedSuccessfully);
-				if (retries > 5) {
-					logger.warn(MARKER_ROCKSDB, "Took {} retries to update key {}", retries, LLUtils.toStringSafe(key));
 				}
-				recordAtomicUpdateTime(changed, prevData != null, newData != null, initNanoTime);
-				optimisticAttempts.record(retries);
-				return switch (returnMode) {
-					case NOTHING -> RESULT_NOTHING;
-					case CURRENT -> new UpdateAtomicResultCurrent(newData);
-					case PREVIOUS -> new UpdateAtomicResultPrevious(prevData);
-					case BINARY_CHANGED -> new UpdateAtomicResultBinaryChanged(changed);
-					case DELTA -> new UpdateAtomicResultDelta(LLDelta.of(prevData, newData));
-				};
 			}
 		} catch (Exception ex) {
 			throw new DBException("Failed to update key " + LLUtils.toStringSafe(key), ex);

src/main/java/it/cavallium/dbengine/database/disk/PessimisticRocksDBColumn.java

@@ -6,6 +6,8 @@ import io.micrometer.core.instrument.MeterRegistry;
 import it.cavallium.buffer.Buf;
 import it.cavallium.dbengine.database.LLDelta;
 import it.cavallium.dbengine.database.LLUtils;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
+import it.cavallium.dbengine.database.disk.rocksdb.LLWriteOptions;
 import it.cavallium.dbengine.database.serialization.SerializationFunction;
 import it.cavallium.dbengine.utils.DBException;
 import java.io.IOException;
@@ -39,14 +41,14 @@ public final class PessimisticRocksDBColumn extends AbstractRocksDBColumn<Transa
 	}
 
 	@Override
-	protected Transaction beginTransaction(@NotNull WriteOptions writeOptions,
+	protected Transaction beginTransaction(@NotNull LLWriteOptions writeOptions,
 			TransactionOptions txOpts) {
-		return getDb().beginTransaction(writeOptions, txOpts);
+		return getDb().beginTransaction(writeOptions.getUnsafe(), txOpts);
 	}
 
 	@Override
-	public @NotNull UpdateAtomicResult updateAtomicImpl(@NotNull ReadOptions readOptions,
+	public @NotNull UpdateAtomicResult updateAtomicImpl(@NotNull LLReadOptions readOptions,
-			@NotNull WriteOptions writeOptions,
+			@NotNull LLWriteOptions writeOptions,
 			Buf key,
 			SerializationFunction<@Nullable Buf, @Nullable Buf> updater,
 			UpdateAtomicResultMode returnMode) {
@@ -57,82 +59,83 @@ public final class PessimisticRocksDBColumn extends AbstractRocksDBColumn<Transa
 			if (LLUtils.isInNonBlockingThread()) {
 				throw new UnsupportedOperationException("Called update in a nonblocking thread");
 			}
-			try (var txOpts = new TransactionOptions();
+			try (var txOpts = new TransactionOptions()) {
-					var tx = beginTransaction(writeOptions, txOpts)) {
+				try (var tx = beginTransaction(writeOptions, txOpts)) {
-				Buf prevData;
+					Buf prevData;
-				Buf newData;
+					Buf newData;
-				boolean changed;
+					boolean changed;
-				if (logger.isTraceEnabled()) {
-					logger.trace(MARKER_ROCKSDB, "Reading {} (before update lock)", LLUtils.toStringSafe(key));
-				}
-				var prevDataArray = tx.getForUpdate(readOptions, cfh, keyArray, true);
-				try {
 					if (logger.isTraceEnabled()) {
-						logger.trace(MARKER_ROCKSDB,
+						logger.trace(MARKER_ROCKSDB, "Reading {} (before update lock)", LLUtils.toStringSafe(key));
-								"Reading {}: {} (before update)",
-								LLUtils.toStringSafe(key),
-								LLUtils.toStringSafe(prevDataArray)
-						);
-					}
-					if (prevDataArray != null) {
-						readValueFoundWithoutBloomBufferSize.record(prevDataArray.length);
-						prevData = Buf.wrap(prevDataArray);
-					} else {
-						readValueNotFoundWithoutBloomBufferSize.record(0);
-						prevData = null;
-					}
-					if (prevData != null) {
-						prevData.freeze();
 					}
+					var prevDataArray = tx.getForUpdate(readOptions.getUnsafe(), cfh, keyArray, true);
 					try {
-						newData = updater.apply(prevData);
-					} catch (Exception ex) {
-						throw new DBException("Failed to update key " + LLUtils.toStringSafe(key) + ". The previous value was:\n" + LLUtils.toStringSafe(prevData, 8192), ex);
-					}
-					var newDataArray = newData == null ? null : LLUtils.asArray(newData);
-					if (logger.isTraceEnabled()) {
-						logger.trace(MARKER_ROCKSDB,
-								"Updating {}. previous data: {}, updated data: {}",
-								LLUtils.toStringSafe(key),
-								LLUtils.toStringSafe(prevDataArray),
-								LLUtils.toStringSafe(newDataArray)
-						);
-					}
-					if (prevData != null && newData == null) {
-						if (logger.isTraceEnabled()) {
-							logger.trace(MARKER_ROCKSDB, "Deleting {} (after update)", LLUtils.toStringSafe(key));
-						}
-						writeValueBufferSize.record(0);
-						tx.delete(cfh, keyArray, true);
-						changed = true;
-						tx.commit();
-					} else if (newData != null && (prevData == null || !LLUtils.equals(prevData, newData))) {
 						if (logger.isTraceEnabled()) {
 							logger.trace(MARKER_ROCKSDB,
-									"Writing {}: {} (after update)",
+									"Reading {}: {} (before update)",
 									LLUtils.toStringSafe(key),
-									LLUtils.toStringSafe(newData)
+									LLUtils.toStringSafe(prevDataArray)
 							);
 						}
-						writeValueBufferSize.record(newDataArray.length);
+						if (prevDataArray != null) {
-						tx.put(cfh, keyArray, newDataArray);
+							readValueFoundWithoutBloomBufferSize.record(prevDataArray.length);
-						changed = true;
+							prevData = Buf.wrap(prevDataArray);
-						tx.commit();
+						} else {
-					} else {
+							readValueNotFoundWithoutBloomBufferSize.record(0);
-						changed = false;
+							prevData = null;
-						tx.rollback();
+						}
+						if (prevData != null) {
+							prevData.freeze();
+						}
+						try {
+							newData = updater.apply(prevData);
+						} catch (Exception ex) {
+							throw new DBException("Failed to update key " + LLUtils.toStringSafe(key) + ". The previous value was:\n" + LLUtils.toStringSafe(prevData, 8192), ex);
+						}
+						var newDataArray = newData == null ? null : LLUtils.asArray(newData);
+						if (logger.isTraceEnabled()) {
+							logger.trace(MARKER_ROCKSDB,
+									"Updating {}. previous data: {}, updated data: {}",
+									LLUtils.toStringSafe(key),
+									LLUtils.toStringSafe(prevDataArray),
+									LLUtils.toStringSafe(newDataArray)
+							);
+						}
+						if (prevData != null && newData == null) {
+							if (logger.isTraceEnabled()) {
+								logger.trace(MARKER_ROCKSDB, "Deleting {} (after update)", LLUtils.toStringSafe(key));
+							}
+							writeValueBufferSize.record(0);
+							tx.delete(cfh, keyArray, true);
+							changed = true;
+							tx.commit();
+						} else if (newData != null && (prevData == null || !LLUtils.equals(prevData, newData))) {
+							if (logger.isTraceEnabled()) {
+								logger.trace(MARKER_ROCKSDB,
+										"Writing {}: {} (after update)",
+										LLUtils.toStringSafe(key),
+										LLUtils.toStringSafe(newData)
+								);
+							}
+							writeValueBufferSize.record(newDataArray.length);
+							tx.put(cfh, keyArray, newDataArray);
+							changed = true;
+							tx.commit();
+						} else {
+							changed = false;
+							tx.rollback();
+						}
+					} finally {
+						tx.undoGetForUpdate(cfh, keyArray);
 					}
-				} finally {
+					recordAtomicUpdateTime(changed, prevData != null, newData != null, initNanoTime);
-					tx.undoGetForUpdate(cfh, keyArray);
+					return switch (returnMode) {
+						case NOTHING -> RESULT_NOTHING;
+						case CURRENT -> new UpdateAtomicResultCurrent(newData);
+						case PREVIOUS -> new UpdateAtomicResultPrevious(prevData);
+						case BINARY_CHANGED -> new UpdateAtomicResultBinaryChanged(changed);
+						case DELTA -> new UpdateAtomicResultDelta(LLDelta.of(prevData, newData));
+					};
 				}
-				recordAtomicUpdateTime(changed, prevData != null, newData != null, initNanoTime);
-				return switch (returnMode) {
-					case NOTHING -> RESULT_NOTHING;
-					case CURRENT -> new UpdateAtomicResultCurrent(newData);
-					case PREVIOUS -> new UpdateAtomicResultPrevious(prevData);
-					case BINARY_CHANGED -> new UpdateAtomicResultBinaryChanged(changed);
-					case DELTA -> new UpdateAtomicResultDelta(LLDelta.of(prevData, newData));
-				};
 			}
 		} catch (Exception ex) {
 			throw new DBException("Failed to update key " + LLUtils.toStringSafe(key), ex);

src/main/java/it/cavallium/dbengine/database/disk/RocksDBColumn.java

@@ -4,6 +4,8 @@ import io.micrometer.core.instrument.MeterRegistry;
 import it.cavallium.buffer.Buf;
 import it.cavallium.dbengine.database.LLRange;
 import it.cavallium.dbengine.database.LLUtils;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
+import it.cavallium.dbengine.database.disk.rocksdb.LLWriteOptions;
 import it.cavallium.dbengine.database.disk.rocksdb.RocksIteratorObj;
 import it.cavallium.dbengine.database.serialization.SerializationFunction;
 import java.io.IOException;
@@ -13,21 +15,19 @@ import org.jetbrains.annotations.Nullable;
 import org.rocksdb.ColumnFamilyHandle;
 import org.rocksdb.CompactRangeOptions;
 import org.rocksdb.FlushOptions;
-import org.rocksdb.ReadOptions;
 import org.rocksdb.RocksDBException;
 import org.rocksdb.WriteBatch;
-import org.rocksdb.WriteOptions;
 
 public sealed interface RocksDBColumn permits AbstractRocksDBColumn {
 
 	/**
 	 * This method should not modify or move the writerIndex/readerIndex of the buffers inside the range
 	 */
-	@NotNull RocksIteratorObj newRocksIterator(ReadOptions readOptions,
+	@NotNull RocksIteratorObj newRocksIterator(LLReadOptions readOptions,
 			LLRange range,
 			boolean reverse) throws RocksDBException;
 
-	default byte @Nullable [] get(@NotNull ReadOptions readOptions,
+	default byte @Nullable [] get(@NotNull LLReadOptions readOptions,
 			byte[] key,
 			boolean existsAlmostCertainly)
 			throws RocksDBException {
@@ -39,33 +39,33 @@ public sealed interface RocksDBColumn permits AbstractRocksDBColumn {
 	}
 
 	@Nullable
-	Buf get(@NotNull ReadOptions readOptions, Buf key) throws RocksDBException;
+	Buf get(@NotNull LLReadOptions readOptions, Buf key) throws RocksDBException;
 
-	boolean exists(@NotNull ReadOptions readOptions, Buf key) throws RocksDBException;
+	boolean exists(@NotNull LLReadOptions readOptions, Buf key) throws RocksDBException;
 
-	boolean mayExists(@NotNull ReadOptions readOptions, Buf key);
+	boolean mayExists(@NotNull LLReadOptions readOptions, Buf key);
 
-	void put(@NotNull WriteOptions writeOptions, Buf key, Buf value) throws RocksDBException;
+	void put(@NotNull LLWriteOptions writeOptions, Buf key, Buf value) throws RocksDBException;
 
-	default void put(@NotNull WriteOptions writeOptions, byte[] key, byte[] value) throws RocksDBException {
+	default void put(@NotNull LLWriteOptions writeOptions, byte[] key, byte[] value) throws RocksDBException {
 		this.put(writeOptions, Buf.wrap(key), Buf.wrap(value));
 	}
 
-	@NotNull RocksIteratorObj newIterator(@NotNull ReadOptions readOptions, @Nullable Buf min, @Nullable Buf max);
+	@NotNull RocksIteratorObj newIterator(@NotNull LLReadOptions readOptions, @Nullable Buf min, @Nullable Buf max);
 
-	@NotNull UpdateAtomicResult updateAtomic(@NotNull ReadOptions readOptions,
+	@NotNull UpdateAtomicResult updateAtomic(@NotNull LLReadOptions readOptions,
-			@NotNull WriteOptions writeOptions,
+			@NotNull LLWriteOptions writeOptions,
 			Buf key,
 			SerializationFunction<@Nullable Buf, @Nullable Buf> updater,
 			UpdateAtomicResultMode returnMode);
 
-	void delete(WriteOptions writeOptions, Buf key) throws RocksDBException;
+	void delete(LLWriteOptions writeOptions, Buf key) throws RocksDBException;
 
-	void delete(WriteOptions writeOptions, byte[] key) throws RocksDBException;
+	void delete(LLWriteOptions writeOptions, byte[] key) throws RocksDBException;
 
-	List<byte[]> multiGetAsList(ReadOptions readOptions, List<byte[]> keys) throws RocksDBException;
+	List<byte[]> multiGetAsList(LLReadOptions readOptions, List<byte[]> keys) throws RocksDBException;
 
-	void write(WriteOptions writeOptions, WriteBatch writeBatch) throws RocksDBException;
+	void write(LLWriteOptions writeOptions, WriteBatch writeBatch) throws RocksDBException;
 
 	void suggestCompactRange() throws RocksDBException;
 

src/main/java/it/cavallium/dbengine/database/disk/RocksDBUtils.java

@@ -3,6 +3,7 @@ package it.cavallium.dbengine.database.disk;
 import static com.google.common.collect.Lists.partition;
 
 import it.cavallium.dbengine.database.LLUtils;
+import it.cavallium.dbengine.utils.SimpleResource;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;
@@ -107,4 +108,10 @@ public class RocksDBUtils {
 			throw new IllegalStateException("Not owning handle");
 		}
 	}
+
+	public static void ensureOwned(@Nullable SimpleResource simpleResource) {
+		if (simpleResource != null && simpleResource.isClosed()) {
+			throw new IllegalStateException("Resource is closed");
+		}
+	}
 }

src/main/java/it/cavallium/dbengine/database/disk/StandardRocksDBColumn.java

@@ -6,6 +6,8 @@ import io.micrometer.core.instrument.MeterRegistry;
 import it.cavallium.buffer.Buf;
 import it.cavallium.dbengine.database.LLDelta;
 import it.cavallium.dbengine.database.LLUtils;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
+import it.cavallium.dbengine.database.disk.rocksdb.LLWriteOptions;
 import it.cavallium.dbengine.database.serialization.SerializationFunction;
 import it.cavallium.dbengine.utils.DBException;
 import java.io.IOException;
@@ -35,14 +37,14 @@ public final class StandardRocksDBColumn extends AbstractRocksDBColumn<RocksDB>
 	}
 
 	@Override
-	protected Transaction beginTransaction(@NotNull WriteOptions writeOptions,
+	protected Transaction beginTransaction(@NotNull LLWriteOptions writeOptions,
 			TransactionOptions txOpts) {
 		throw new UnsupportedOperationException("Transactions not supported");
 	}
 
 	@Override
-	public @NotNull UpdateAtomicResult updateAtomicImpl(@NotNull ReadOptions readOptions,
+	public @NotNull UpdateAtomicResult updateAtomicImpl(@NotNull LLReadOptions readOptions,
-			@NotNull WriteOptions writeOptions,
+			@NotNull LLWriteOptions writeOptions,
 			Buf key,
 			SerializationFunction<@Nullable Buf, @Nullable Buf> updater,
 			UpdateAtomicResultMode returnMode) {

src/main/java/it/cavallium/dbengine/database/disk/rocksdb/LLColumnFamilyHandle.java

@@ -8,6 +8,7 @@ public final class LLColumnFamilyHandle extends SimpleResource {
 	private final ColumnFamilyHandle val;
 
 	public LLColumnFamilyHandle(ColumnFamilyHandle val) {
+		super(val::close);
 		this.val = val;
 	}
 

src/main/java/it/cavallium/dbengine/database/disk/rocksdb/LLCompactionOptions.java

@@ -8,6 +8,7 @@ public final class LLCompactionOptions extends SimpleResource {
 	private final CompactionOptions val;
 
 	public LLCompactionOptions(CompactionOptions val) {
+		super(val::close);
 		this.val = val;
 	}
 

src/main/java/it/cavallium/dbengine/database/disk/rocksdb/LLReadOptions.java

@@ -1,18 +1,89 @@
 package it.cavallium.dbengine.database.disk.rocksdb;
 
+import it.cavallium.dbengine.database.disk.IteratorMetrics;
 import it.cavallium.dbengine.utils.SimpleResource;
+import org.rocksdb.ColumnFamilyHandle;
 import org.rocksdb.ReadOptions;
+import org.rocksdb.RocksDB;
+import org.rocksdb.Snapshot;
 
 public final class LLReadOptions extends SimpleResource {
 
 	private final ReadOptions val;
+	private LLSlice itLowerBoundRef;
+	private LLSlice itUpperBoundRef;
+	private Snapshot snapshot;
 
 	public LLReadOptions(ReadOptions val) {
+		super(val::close);
 		this.val = val;
 	}
 
+	public LLReadOptions() {
+		this(new ReadOptions());
+	}
+
+	public LLReadOptions copy() {
+		var ro = new LLReadOptions(new ReadOptions(this.val));
+		ro.itUpperBoundRef = this.itUpperBoundRef;
+		ro.itLowerBoundRef = this.itLowerBoundRef;
+		ro.snapshot = this.snapshot;
+		return ro;
+	}
+
 	@Override
 	protected void onClose() {
 		val.close();
+		itLowerBoundRef = null;
+		itUpperBoundRef = null;
+		snapshot = null;
+	}
+
+	public void setIterateLowerBound(LLSlice slice) {
+		val.setIterateLowerBound(slice.getSliceUnsafe());
+		itLowerBoundRef = slice;
+	}
+
+	public void setIterateUpperBound(LLSlice slice) {
+		val.setIterateUpperBound(slice.getSliceUnsafe());
+		itUpperBoundRef = slice;
+	}
+
+	public long readaheadSize() {
+		return val.readaheadSize();
+	}
+
+	public void setReadaheadSize(long readaheadSize) {
+		val.setReadaheadSize(readaheadSize);
+	}
+
+	public RocksIteratorObj newIterator(RocksDB db, ColumnFamilyHandle cfh, IteratorMetrics iteratorMetrics) {
+		return new RocksIteratorObj(db.newIterator(cfh, val), this, iteratorMetrics);
+	}
+
+	public void setFillCache(boolean fillCache) {
+		val.setFillCache(fillCache);
+	}
+
+	public void setVerifyChecksums(boolean verifyChecksums) {
+		val.setVerifyChecksums(verifyChecksums);
+	}
+
+	public ReadOptions getUnsafe() {
+		return val;
+	}
+
+	public LLReadOptions setSnapshot(Snapshot snapshot) {
+		val.setSnapshot(snapshot);
+		this.snapshot = snapshot;
+		return this;
+	}
+
+	public void setIgnoreRangeDeletions(boolean ignoreRangeDeletions) {
+		val.setIgnoreRangeDeletions(ignoreRangeDeletions);
+	}
+
+	public Snapshot snapshot() {
+		return val.snapshot();
 	}
 }

src/main/java/it/cavallium/dbengine/database/disk/rocksdb/LLSlice.java

@@ -0,0 +1,28 @@
+package it.cavallium.dbengine.database.disk.rocksdb;
+
+import it.cavallium.dbengine.utils.SimpleResource;
+import org.rocksdb.AbstractSlice;
+import org.rocksdb.Slice;
+
+public final class LLSlice extends SimpleResource {
+
+	private final AbstractSlice<?> val;
+
+	public LLSlice(AbstractSlice<?> val) {
+		super(val::close);
+		this.val = val;
+	}
+
+	public static LLSlice of(byte[] data) {
+		return new LLSlice(new Slice(data));
+	}
+
+	public AbstractSlice<?> getSliceUnsafe() {
+		return val;
+	}
+
+	@Override
+	protected void onClose() {
+		val.close();
+	}
+}

src/main/java/it/cavallium/dbengine/database/disk/rocksdb/LLWriteOptions.java

@@ -8,11 +8,40 @@ public final class LLWriteOptions extends SimpleResource {
 	private final WriteOptions val;
 
 	public LLWriteOptions(WriteOptions val) {
+		super(val::close);
 		this.val = val;
 	}
 
+	public LLWriteOptions() {
+		this(new WriteOptions());
+	}
+
 	@Override
 	protected void onClose() {
 		val.close();
 	}
+
+	public WriteOptions getUnsafe() {
+		return val;
+	}
+
+	public LLWriteOptions setDisableWAL(boolean disableWAL) {
+		val.setDisableWAL(disableWAL);
+		return this;
+	}
+
+	public LLWriteOptions setNoSlowdown(boolean noSlowdown) {
+		val.setNoSlowdown(noSlowdown);
+		return this;
+	}
+
+	public LLWriteOptions setLowPri(boolean lowPri) {
+		val.setLowPri(lowPri);
+		return this;
+	}
+
+	public LLWriteOptions setMemtableInsertHintPerBatch(boolean memtableInsertHintPerBatch) {
+		val.setMemtableInsertHintPerBatch(memtableInsertHintPerBatch);
+		return this;
+	}
 }

src/main/java/it/cavallium/dbengine/database/disk/rocksdb/RocksIteratorObj.java

@@ -4,6 +4,7 @@ import io.micrometer.core.instrument.Counter;
 import io.micrometer.core.instrument.Timer;
 import it.cavallium.buffer.Buf;
 import it.cavallium.dbengine.database.LLUtils;
+import it.cavallium.dbengine.database.disk.IteratorMetrics;
 import it.cavallium.dbengine.utils.SimpleResource;
 import java.nio.ByteBuffer;
 import org.rocksdb.AbstractSlice;
@@ -12,73 +13,28 @@ import org.rocksdb.RocksIterator;
 
 public class RocksIteratorObj extends SimpleResource {
 
-	private RocksIterator rocksIterator;
+	private LLReadOptions readOptions;
-	private AbstractSlice<?> sliceMin;
+	private final RocksIterator rocksIterator;
-	private AbstractSlice<?> sliceMax;
-	private Buf min;
-	private Buf max;
 	private final Counter startedIterSeek;
 	private final Counter endedIterSeek;
 	private final Timer iterSeekTime;
 	private final Counter startedIterNext;
 	private final Counter endedIterNext;
 	private final Timer iterNextTime;
-	private Object seekingFrom;
+	private byte[] seekingFrom;
-	private Object seekingTo;
+	private byte[] seekingTo;
 
-	public RocksIteratorObj(RocksIterator rocksIterator,
+	RocksIteratorObj(RocksIterator rocksIterator,
-			AbstractSlice<?> sliceMin,
+			LLReadOptions readOptions, IteratorMetrics iteratorMetrics) {
-			AbstractSlice<?> sliceMax,
+		super(rocksIterator::close);
-			Buf min,
+		this.readOptions = readOptions;
-			Buf max,
-			Counter startedIterSeek,
-			Counter endedIterSeek,
-			Timer iterSeekTime,
-			Counter startedIterNext,
-			Counter endedIterNext,
-			Timer iterNextTime) {
-		this(rocksIterator,
-				sliceMin,
-				sliceMax,
-				min,
-				max,
-				startedIterSeek,
-				endedIterSeek,
-				iterSeekTime,
-				startedIterNext,
-				endedIterNext,
-				iterNextTime,
-				null,
-				null
-		);
-	}
-
-	private RocksIteratorObj(RocksIterator rocksIterator,
-			AbstractSlice<?> sliceMin,
-			AbstractSlice<?> sliceMax,
-			Buf min,
-			Buf max,
-			Counter startedIterSeek,
-			Counter endedIterSeek,
-			Timer iterSeekTime,
-			Counter startedIterNext,
-			Counter endedIterNext,
-			Timer iterNextTime,
-			Object seekingFrom,
-			Object seekingTo) {
-		this.sliceMin = sliceMin;
-		this.sliceMax = sliceMax;
-		this.min = min;
-		this.max = max;
 		this.rocksIterator = rocksIterator;
-		this.startedIterSeek = startedIterSeek;
+		this.startedIterSeek = iteratorMetrics.startedIterSeek();
-		this.endedIterSeek = endedIterSeek;
+		this.startedIterNext = iteratorMetrics.startedIterNext();
-		this.iterSeekTime = iterSeekTime;
+		this.iterSeekTime = iteratorMetrics.iterSeekTime();
-		this.startedIterNext = startedIterNext;
+		this.endedIterNext = iteratorMetrics.endedIterNext();
-		this.endedIterNext = endedIterNext;
+		this.endedIterSeek = iteratorMetrics.endedIterSeek();
-		this.iterNextTime = iterNextTime;
+		this.iterNextTime = iteratorMetrics.iterNextTime();
-		this.seekingFrom = seekingFrom;
-		this.seekingTo = seekingTo;
 	}
 
 	public void seek(ByteBuffer seekBuf) throws RocksDBException {
@@ -233,11 +189,8 @@ public class RocksIteratorObj extends SimpleResource {
 		if (rocksIterator != null) {
 			rocksIterator.close();
 		}
-		if (sliceMin != null) {
+		seekingFrom = null;
-			sliceMin.close();
+		seekingTo = null;
-		}
+		readOptions = null;
-		if (sliceMax != null) {
-			sliceMax.close();
-		}
 	}
 }

src/test/java/it/cavallium/dbengine/tests/TestGetter.java

@@ -3,6 +3,7 @@ package it.cavallium.dbengine.tests;
 import static java.util.Map.entry;
 
 import it.cavallium.dbengine.database.disk.KeyMayExistGetter;
+import it.cavallium.dbengine.database.disk.rocksdb.LLReadOptions;
 import it.unimi.dsi.fastutil.bytes.ByteList;
 import java.nio.ByteBuffer;
 import java.nio.charset.StandardCharsets;
@@ -42,22 +43,22 @@ public class TestGetter {
 
 	public KeyMayExistGetter getter = new KeyMayExistGetter() {
 		@Override
-		protected KeyMayExist keyMayExist(ReadOptions readOptions, ByteBuffer key, ByteBuffer value) {
+		protected KeyMayExist keyMayExist(LLReadOptions readOptions, ByteBuffer key, ByteBuffer value) {
 			return null;
 		}
 
 		@Override
-		protected boolean keyMayExist(ReadOptions readOptions, byte[] key, @Nullable Holder<byte[]> valueHolder) {
+		protected boolean keyMayExist(LLReadOptions readOptions, byte[] key, @Nullable Holder<byte[]> valueHolder) {
 			throw new UnsupportedOperationException();
 		}
 
 		@Override
-		protected int get(ReadOptions opt, ByteBuffer key, ByteBuffer value) throws RocksDBException {
+		protected int get(LLReadOptions opt, ByteBuffer key, ByteBuffer value) throws RocksDBException {
 			return 0;
 		}
 
 		@Override
-		protected byte[] get(ReadOptions opt, byte[] key) throws RocksDBException, IllegalArgumentException {
+		protected byte[] get(LLReadOptions opt, byte[] key) throws RocksDBException, IllegalArgumentException {
 			throw new UnsupportedOperationException();
 		}