Improve loading, update configs

.gitignore

@@ -1,4 +1,6 @@
-
 .idea/
-
 target/
+tmp-rockserver-db/
+.directory
+*.iml
+hs_err_pid*.log

pom.xml

@@ -12,7 +12,8 @@
     <maven.compiler.source>21</maven.compiler.source>
     <maven.compiler.target>21</maven.compiler.target>
     <native.maven.plugin.version>0.9.28</native.maven.plugin.version>
-    <gestalt.version>0.22.0</gestalt.version>
+    <gestalt.version>0.24.1</gestalt.version>
+    <rocksdb.version>8.8.1</rocksdb.version>
     <imageName>rockserver-core</imageName>
     <mainClass>it.cavallium.rockserver.core.Main</mainClass>
   </properties>
@@ -21,7 +22,7 @@
     <dependency>
       <groupId>org.rocksdb</groupId>
       <artifactId>rocksdbjni</artifactId>
-      <version>8.8.1</version>
+      <version>${rocksdb.version}</version>
     </dependency>
     <dependency>
       <groupId>net.sourceforge.argparse4j</groupId>
@@ -75,6 +76,16 @@
   </dependencies>
 
   <build>
+    <resources>
+      <resource>
+        <directory>src/main/filtered-resources</directory>
+        <filtering>true</filtering>
+      </resource>
+      <resource>
+        <directory>src/main/resources</directory>
+        <filtering>false</filtering>
+      </resource>
+    </resources>
     <plugins>
       <plugin>
         <groupId>org.codehaus.mojo</groupId>

src/main/filtered-resources/it/cavallium/rockserver/core/resources/build.properties

@@ -0,0 +1,2 @@
+rockserver.core.version=${project.version}
+rockserver.core.rocksdb.version=${rocksdb.version}

src/main/java/it/cavallium/rockserver/core/Main.java

@@ -5,6 +5,7 @@ import static java.util.Objects.requireNonNull;
 
 import inet.ipaddr.HostName;
 
+import it.cavallium.rockserver.core.impl.rocksdb.RocksDBLoader;
 import java.io.IOException;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -60,7 +61,7 @@ public class Main {
 		}
 
 		LOG.info("Starting...");
-		RocksDB.loadLibrary();
+		RocksDBLoader.loadLibrary();
 
 		var rawUrl = ns.getString("url");
 		var name = ns.getString("name");

src/main/java/it/cavallium/rockserver/core/common/RocksDBException.java

@@ -28,6 +28,10 @@ public class RocksDBException extends RuntimeException {
 		this(errorUniqueId, ex.getMessage());
 	}
 
+	public RocksDBException(RocksDBErrorType errorUniqueId, String message, org.rocksdb.RocksDBException ex) {
+		this(errorUniqueId, message + ": " + ex.getMessage());
+	}
+
 	public RocksDBErrorType getErrorUniqueId() {
 		return errorUniqueId;
 	}

src/main/java/it/cavallium/rockserver/core/config/ConfigParser.java

@@ -0,0 +1,67 @@
+package it.cavallium.rockserver.core.config;
+
+import it.cavallium.rockserver.core.common.RocksDBException;
+import it.cavallium.rockserver.core.common.RocksDBException.RocksDBErrorType;
+import it.cavallium.rockserver.core.impl.DataSizeDecoder;
+import it.cavallium.rockserver.core.impl.DbCompressionDecoder;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+import org.github.gestalt.config.builder.GestaltBuilder;
+import org.github.gestalt.config.builder.SourceBuilder;
+import org.github.gestalt.config.exceptions.GestaltException;
+import org.github.gestalt.config.source.ClassPathConfigSourceBuilder;
+import org.github.gestalt.config.source.FileConfigSourceBuilder;
+
+public class ConfigParser {
+
+	private final GestaltBuilder gsb;
+	private final List<SourceBuilder<?, ?>> sourceBuilders = new ArrayList<>();
+
+	public ConfigParser() {
+		gsb = new GestaltBuilder();
+			gsb
+					.setTreatMissingArrayIndexAsError(false)
+					.setTreatEmptyCollectionAsErrors(false)
+					.setTreatNullValuesInClassAsErrors(false)
+					.setTreatMissingValuesAsErrors(false)
+					.addDecoder(new DataSizeDecoder())
+					.addDecoder(new DbCompressionDecoder())
+					.addDefaultConfigLoaders()
+					.addDefaultDecoders();
+	}
+
+	public static DatabaseConfig parse(Path configPath) {
+		var parser = new ConfigParser();
+		parser.addSource(configPath);
+		return parser.parse();
+	}
+
+	public static DatabaseConfig parseDefault() {
+		var parser = new ConfigParser();
+		return parser.parse();
+	}
+
+
+	public void addSource(Path path) {
+		if (path != null) {
+			sourceBuilders.add(FileConfigSourceBuilder.builder().setPath(path));
+		}
+	}
+
+	public DatabaseConfig parse() {
+		try {
+			gsb.addSource(ClassPathConfigSourceBuilder
+					.builder().setResource("it/cavallium/rockserver/core/resources/default.conf").build());
+			for (SourceBuilder<?, ?> sourceBuilder : sourceBuilders) {
+				gsb.addSource(sourceBuilder.build());
+			}
+			var gestalt = gsb.build();
+			gestalt.loadConfigs();
+
+			return gestalt.getConfig("database", DatabaseConfig.class);
+		} catch (GestaltException ex) {
+			throw new RocksDBException(RocksDBErrorType.CONFIG_ERROR, ex);
+		}
+	}
+}

src/main/java/it/cavallium/rockserver/core/config/ConfigPrinter.java

@@ -1,5 +1,7 @@
 package it.cavallium.rockserver.core.config;
 
+import it.cavallium.rockserver.core.common.RocksDBException;
+import it.cavallium.rockserver.core.common.RocksDBException.RocksDBErrorType;
 import org.github.gestalt.config.exceptions.GestaltException;
 
 import java.util.*;
@@ -15,6 +17,14 @@ public class ConfigPrinter {
 				""".formatted(o.bitsPerKey(), o.optimizeForHits());
 	}
 
+	public static String stringify(DatabaseConfig config) {
+		try {
+			return stringifyDatabase(config);
+		} catch (GestaltException e) {
+			throw new RocksDBException(RocksDBErrorType.CONFIG_ERROR, "Can't stringify config", e);
+		}
+	}
+
 	public static String stringifyDatabase(DatabaseConfig o) throws GestaltException {
 		return """
 				{
@@ -31,11 +41,11 @@ public class ConfigPrinter {
 				""".formatted(o.compression(), o.maxDictBytes());
 	}
 
-	private static List<VolumeConfig> getVolumeConfigs(GlobalDatabaseConfig g) throws GestaltException {
+	public static List<VolumeConfig> getVolumeConfigs(GlobalDatabaseConfig g) throws GestaltException {
 		try {
 			return List.of(g.volumes());
 		} catch (GestaltException ex) {
-			if (ex.getMessage().equals("Failed to get proxy config while calling method: volumes in path: database.global.")) {
+			if (ex.getMessage().startsWith("Failed to get cached object from proxy config while calling method:")) {
 				return List.of();
 			} else {
 				throw ex;
@@ -92,10 +102,10 @@ public class ConfigPrinter {
 		return """
 				{
 				      "volume-path": "%s",
-				      "target-size-bytes": %b
+				      "target-size-bytes": "%s"
 				    }\
 				""".formatted(o.volumePath(),
-				o.targetSizeBytes()
+				o.targetSize()
 		);
 	}
 

src/main/java/it/cavallium/rockserver/core/config/VolumeConfig.java

@@ -8,5 +8,5 @@ public interface VolumeConfig {
 
 	Path volumePath() throws GestaltException;
 
-	long targetSizeBytes() throws GestaltException;
+	DataSize targetSize() throws GestaltException;
 }

src/main/java/it/cavallium/rockserver/core/impl/DataSizeDecoder.java

@@ -3,14 +3,16 @@ package it.cavallium.rockserver.core.impl;
 import it.cavallium.rockserver.core.config.DataSize;
 import java.util.List;
 import org.github.gestalt.config.decoder.Decoder;
+import org.github.gestalt.config.decoder.DecoderContext;
 import org.github.gestalt.config.decoder.DecoderService;
 import org.github.gestalt.config.decoder.Priority;
 import org.github.gestalt.config.entity.ValidationError;
 import org.github.gestalt.config.node.ConfigNode;
 import org.github.gestalt.config.reflect.TypeCapture;
+import org.github.gestalt.config.tag.Tags;
 import org.github.gestalt.config.utils.ValidateOf;
 
-class DataSizeDecoder implements Decoder<DataSize> {
+public class DataSizeDecoder implements Decoder<DataSize> {
 
 	@Override
 	public Priority priority() {
@@ -23,12 +25,16 @@ class DataSizeDecoder implements Decoder<DataSize> {
 	}
 
 	@Override
-	public boolean matches(TypeCapture klass) {
+	public boolean canDecode(String path, Tags tags, ConfigNode node, TypeCapture<?> type) {
-		return klass != null && klass.isAssignableFrom(DataSize.class);
+		return type != null && type.isAssignableFrom(DataSize.class);
 	}
 
 	@Override
-	public ValidateOf<DataSize> decode(String path, ConfigNode node, TypeCapture type, DecoderService decoderService) {
+	public ValidateOf<DataSize> decode(String path,
+			Tags tags,
+			ConfigNode node,
+			TypeCapture<?> type,
+			DecoderContext decoderContext) {
 		try {
 			return ValidateOf.validateOf(new DataSize(node.getValue().orElseThrow()), List.of());
 		} catch (Exception ex) {

src/main/java/it/cavallium/rockserver/core/impl/DbCompressionDecoder.java

@@ -4,11 +4,13 @@ import it.cavallium.rockserver.core.config.DataSize;
 import it.cavallium.rockserver.core.config.DatabaseCompression;
 import java.util.List;
 import org.github.gestalt.config.decoder.Decoder;
+import org.github.gestalt.config.decoder.DecoderContext;
 import org.github.gestalt.config.decoder.DecoderService;
 import org.github.gestalt.config.decoder.Priority;
 import org.github.gestalt.config.entity.ValidationError;
 import org.github.gestalt.config.node.ConfigNode;
 import org.github.gestalt.config.reflect.TypeCapture;
+import org.github.gestalt.config.tag.Tags;
 import org.github.gestalt.config.utils.ValidateOf;
 import org.rocksdb.CompressionType;
 
@@ -25,15 +27,16 @@ public class DbCompressionDecoder implements Decoder<CompressionType> {
 	}
 
 	@Override
-	public boolean matches(TypeCapture<?> klass) {
+	public boolean canDecode(String path, Tags tags, ConfigNode node, TypeCapture<?> type) {
-		return klass != null && klass.isAssignableFrom(CompressionType.class);
+		return type != null && type.isAssignableFrom(CompressionType.class);
 	}
 
 	@Override
 	public ValidateOf<CompressionType> decode(String path,
+			Tags tags,
 			ConfigNode node,
 			TypeCapture<?> type,
-			DecoderService decoderService) {
+			DecoderContext decoderContext) {
 		try {
 			return ValidateOf.validateOf(DatabaseCompression.valueOf(node.getValue().orElseThrow()).compressionType(), List.of());
 		} catch (Exception ex) {

src/main/java/it/cavallium/rockserver/core/impl/EmbeddedDB.java

@@ -19,6 +19,7 @@ import it.cavallium.rockserver.core.common.Delta;
 import it.cavallium.rockserver.core.common.RocksDBAPI;
 import it.cavallium.rockserver.core.common.RocksDBException.RocksDBErrorType;
 import it.cavallium.rockserver.core.common.Utils;
+import it.cavallium.rockserver.core.config.ConfigParser;
 import it.cavallium.rockserver.core.config.ConfigPrinter;
 import it.cavallium.rockserver.core.config.DatabaseConfig;
 import it.cavallium.rockserver.core.impl.rocksdb.REntry;
@@ -45,7 +46,10 @@ import org.cliffc.high_scale_lib.NonBlockingHashMapLong;
 import org.github.gestalt.config.builder.GestaltBuilder;
 import org.github.gestalt.config.exceptions.GestaltException;
 import org.github.gestalt.config.source.ClassPathConfigSource;
+import org.github.gestalt.config.source.ClassPathConfigSourceBuilder;
 import org.github.gestalt.config.source.FileConfigSource;
+import org.github.gestalt.config.source.FileConfigSourceBuilder;
+import org.github.gestalt.config.source.StringConfigSourceBuilder;
 import org.jetbrains.annotations.Nullable;
 import org.rocksdb.*;
 import org.rocksdb.Status.Code;
@@ -75,28 +79,10 @@ public class EmbeddedDB implements RocksDBAPI, Closeable {
 		this.its = new NonBlockingHashMapLong<>();
 		this.columnNamesIndex = new ConcurrentHashMap<>();
 		this.ops = new SafeShutdown();
-
+		this.config = ConfigParser.parse(this.embeddedConfigPath);
-		var gsb = new GestaltBuilder();
+		this.db = RocksDBLoader.load(path, config, logger);
-		try {
+		if (Boolean.parseBoolean(System.getProperty("rockserver.core.print-config", "true"))) {
-			gsb.addSource(new ClassPathConfigSource("it/cavallium/rockserver/core/resources/default.conf"));
+			logger.log(Level.INFO, "Database configuration: {0}", ConfigPrinter.stringify(this.config));
-			if (embeddedConfigPath != null) {
-				gsb.addSource(new FileConfigSource(this.embeddedConfigPath));
-			}
-			var gestalt = gsb
-					.addDecoder(new DataSizeDecoder())
-					.addDecoder(new DbCompressionDecoder())
-					.addDefaultConfigLoaders()
-					.addDefaultDecoders()
-					.build();
-			gestalt.loadConfigs();
-
-			this.config = gestalt.getConfig("database", DatabaseConfig.class);
-			this.db = RocksDBLoader.load(path, config, logger);
-			if (Boolean.parseBoolean(System.getProperty("rockserver.core.print-config", "true"))) {
-				logger.log(Level.INFO, "Database configuration: {0}", ConfigPrinter.stringifyDatabase(this.config));
-			}
-		} catch (GestaltException e) {
-			throw new it.cavallium.rockserver.core.common.RocksDBException(RocksDBErrorType.CONFIG_ERROR, e);
 		}
 	}
 

src/main/java/it/cavallium/rockserver/core/impl/rocksdb/RocksDBLoader.java

@@ -1,17 +1,18 @@
 package it.cavallium.rockserver.core.impl.rocksdb;
 
+import it.cavallium.rockserver.core.common.RocksDBException.RocksDBErrorType;
 import it.cavallium.rockserver.core.config.*;
 import org.github.gestalt.config.exceptions.GestaltException;
+import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.rocksdb.*;
+import org.rocksdb.util.Environment;
 import org.rocksdb.util.SizeUnit;
 
-import java.io.File;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.nio.file.Paths;
 import java.util.*;
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -31,29 +32,56 @@ public class RocksDBLoader {
             = Boolean.parseBoolean(System.getProperty("it.cavallium.dbengine.clockcache.enable", "false"));
     private static final CacheFactory CACHE_FACTORY = USE_CLOCK_CACHE ? new ClockCacheFactory() : new LRUCacheFactory();
 
+    public static void loadLibrary() {
+        RocksDB.loadLibrary();
+        /* todo: rocksdb does not support loading the library outside of the default mechanism
+        try {
+            var jniPath = Path.of(".").resolve("jni").resolve(RocksDBMetadata.getRocksDBVersionHash());
+            if (Files.notExists(jniPath)) {
+                Files.createDirectories(jniPath);
+            }
+            // todo:
+        } catch (IOException e) {
+            RocksDB.loadLibrary();
+        }
+         */
+    }
+
+
     public static TransactionalDB load(@Nullable Path path, DatabaseConfig config, Logger logger) {
         var refs = new RocksDBObjects();
-        var optionsWithCache = makeRocksDBOptions(path, config, refs, logger);
+        // Get databases directory path
-        return loadDb(path, config, optionsWithCache, refs, logger);
+        Path definitiveDbPath;
+        if (path != null) {
+            definitiveDbPath = path.toAbsolutePath();
+        } else {
+            try {
+                definitiveDbPath = Files.createTempDirectory("temp-rocksdb");
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        }
+        var optionsWithCache = makeRocksDBOptions(path, definitiveDbPath, config, refs, logger);
+        return loadDb(path, definitiveDbPath, config, optionsWithCache, refs, logger);
     }
 
     record OptionsWithCache(DBOptions options, @Nullable Cache standardCache) {}
 
-    private static OptionsWithCache makeRocksDBOptions(@Nullable Path path, DatabaseConfig databaseOptions, RocksDBObjects refs, Logger logger) {
+    private static OptionsWithCache makeRocksDBOptions(@Nullable Path path,
+        Path definitiveDbPath,
+        DatabaseConfig databaseOptions,
+        RocksDBObjects refs,
+        Logger logger) {
         try {
             // Get databases directory path
-            Path databasesDirPath;
+            Path parentPath;
             if (path != null) {
-                databasesDirPath = path.toAbsolutePath().getParent();
+                parentPath = path.toAbsolutePath().getParent();
-                // Create base directories
-                if (Files.notExists(databasesDirPath)) {
-                    Files.createDirectories(databasesDirPath);
-                }
             } else {
-                databasesDirPath = null;
+                parentPath = null;
             }
 
-            List<VolumeConfig> volumeConfigs = getVolumeConfigs(databaseOptions);
+            List<DbPathRecord> volumeConfigs = getVolumeConfigs(definitiveDbPath, databaseOptions);
 
             // the Options class contains a set of configurable DB options
             // that determines the behaviour of the database.
@@ -71,14 +99,10 @@ public class RocksDBLoader {
                 options.setDelayedWriteRate(customWriteRate);
             }
 
-            Optional.ofNullable(databaseOptions.global().logPath())
+            getLogPath(definitiveDbPath, databaseOptions).map(Path::toString).ifPresent(options::setDbLogDir);
-                    .map(Path::toString)
-                    .ifPresent(options::setDbLogDir);
 
             if (path != null) {
-                Optional.ofNullable(databaseOptions.global().walPath())
+                getWalDir(definitiveDbPath, databaseOptions).map(Path::toString).ifPresent(options::setWalDir);
-                        .map(Path::toString)
-                        .ifPresent(options::setWalDir);
             }
 
             options.setCreateIfMissing(true);
@@ -97,14 +121,12 @@ public class RocksDBLoader {
             options.setDeleteObsoleteFilesPeriodMicros(20 * 1000000); // 20 seconds
             options.setKeepLogFileNum(10);
 
-            if (databasesDirPath != null) {
+            if (parentPath != null) {
-                requireNonNull(databasesDirPath);
+                requireNonNull(parentPath);
                 requireNonNull(path.getFileName());
-                List<DbPath> paths = mapList(convertPaths(databasesDirPath, path.getFileName(), volumeConfigs),
+                List<DbPath> paths = mapList(volumeConfigs, p -> new DbPath(p.path, p.targetSize));
-                        p -> new DbPath(p.path, p.targetSize)
-                );
                 options.setDbPaths(paths);
-            } else if (!volumeConfigs.isEmpty()) {
+            } else if (!volumeConfigs.isEmpty() && (volumeConfigs.size() > 1 || definitiveDbPath.relativize(volumeConfigs.getFirst().path).isAbsolute())) {
                 throw new it.cavallium.rockserver.core.common.RocksDBException(it.cavallium.rockserver.core.common.RocksDBException.RocksDBErrorType.CONFIG_ERROR, "in-memory databases should not have any volume configured");
             }
             options.setMaxOpenFiles(Optional.ofNullable(databaseOptions.global().maximumOpenFiles()).orElse(-1));
@@ -195,30 +217,63 @@ public class RocksDBLoader {
             }
 
             return new OptionsWithCache(options, blockCache);
-        } catch (IOException e) {
-            throw new it.cavallium.rockserver.core.common.RocksDBException(it.cavallium.rockserver.core.common.RocksDBException.RocksDBErrorType.ROCKSDB_LOAD_ERROR, e);
         } catch (GestaltException e) {
             throw new it.cavallium.rockserver.core.common.RocksDBException(it.cavallium.rockserver.core.common.RocksDBException.RocksDBErrorType.ROCKSDB_CONFIG_ERROR, e);
         }
     }
 
-    private static List<VolumeConfig> getVolumeConfigs(DatabaseConfig databaseOptions) throws GestaltException {
+    private static Optional<Path> getWalDir(Path definitiveDbPath, DatabaseConfig databaseOptions)
-        try {
+        throws GestaltException {
-            return List.of(databaseOptions.global().volumes());
+        return Optional.ofNullable(databaseOptions.global().walPath())
-        } catch (GestaltException ex) {
+            .map(definitiveDbPath::resolve);
-            if (ex.getMessage().equals("Failed to get proxy config while calling method: volumes in path: database.global.")) {
-                return List.of();
-            } else {
-                throw ex;
-            }
-        }
     }
 
-    private static TransactionalDB loadDb(@Nullable Path path, DatabaseConfig databaseOptions, OptionsWithCache optionsWithCache, RocksDBObjects refs, Logger logger) {
+    private static Optional<Path> getLogPath(Path definitiveDbPath, DatabaseConfig databaseOptions)
+        throws GestaltException {
+        return Optional.ofNullable(databaseOptions.global().logPath())
+            .map(definitiveDbPath::resolve);
+    }
+
+    public static List<DbPathRecord> getVolumeConfigs(@NotNull Path definitiveDbPath, DatabaseConfig databaseOptions)
+        throws GestaltException {
+        return ConfigPrinter
+            .getVolumeConfigs(databaseOptions.global())
+            .stream()
+            .map(volumeConfig -> {
+                try {
+                    return new DbPathRecord(definitiveDbPath.resolve(volumeConfig.volumePath()), volumeConfig.targetSize().longValue());
+                } catch (GestaltException e) {
+                    throw new it.cavallium.rockserver.core.common.RocksDBException(RocksDBErrorType.CONFIG_ERROR, "Failed to load volume configurations", e);
+                }
+            })
+            .toList();
+    }
+
+    private static TransactionalDB loadDb(@Nullable Path path,
+        @NotNull Path definitiveDbPath,
+        DatabaseConfig databaseOptions, OptionsWithCache optionsWithCache, RocksDBObjects refs, Logger logger) {
         var rocksdbOptions = optionsWithCache.options();
         try {
-            List<VolumeConfig> volumeConfigs = getVolumeConfigs(databaseOptions);
+            List<DbPathRecord> volumeConfigs = getVolumeConfigs(definitiveDbPath, databaseOptions);
             List<ColumnFamilyDescriptor> descriptors = new ArrayList<>();
+            var walPath = getWalDir(definitiveDbPath, databaseOptions);
+            var logPath = getLogPath(definitiveDbPath, databaseOptions);
+
+            // Create base directories
+            if (Files.notExists(definitiveDbPath)) {
+                Files.createDirectories(definitiveDbPath);
+            }
+            for (DbPathRecord volumeConfig : volumeConfigs) {
+                if (Files.notExists(volumeConfig.path)) {
+                    Files.createDirectories(volumeConfig.path);
+                }
+            }
+            if (walPath.isPresent() && Files.notExists(walPath.get())) {
+                Files.createDirectories(walPath.get());
+            }
+            if (logPath.isPresent() && Files.notExists(logPath.get())) {
+                Files.createDirectories(logPath.get());
+            }
 
             var defaultColumnOptions = new ColumnFamilyOptions();
             refs.add(defaultColumnOptions);
@@ -444,35 +499,22 @@ public class RocksDBLoader {
                 descriptors.add(new ColumnFamilyDescriptor(name.getBytes(StandardCharsets.US_ASCII), columnFamilyOptions));
             }
 
-            // Get databases directory path
-            String definitiveDbPathString;
-            if (path != null) {
-                Path databasesDirPath = path.toAbsolutePath().getParent();
-                definitiveDbPathString = databasesDirPath.toString() + File.separatorChar + path.getFileName();
-            } else {
-                try {
-                    definitiveDbPathString = Files.createTempDirectory("temp-rocksdb").toString();
-                } catch (IOException e) {
-                    throw new RuntimeException(e);
-                }
-            }
-
             var handles = new ArrayList<ColumnFamilyHandle>();
             RocksDB db;
             // a factory method that returns a RocksDB instance
             if (databaseOptions.global().optimistic()) {
-                db = OptimisticTransactionDB.open(rocksdbOptions, definitiveDbPathString, descriptors, handles);
+                db = OptimisticTransactionDB.open(rocksdbOptions, definitiveDbPath.toString(), descriptors, handles);
             } else {
                 var transactionOptions = new TransactionDBOptions()
-                        .setWritePolicy(TxnDBWritePolicy.WRITE_COMMITTED)
+                    .setWritePolicy(TxnDBWritePolicy.WRITE_COMMITTED)
-                        .setTransactionLockTimeout(5000)
+                    .setTransactionLockTimeout(5000)
-                        .setDefaultLockTimeout(5000);
+                    .setDefaultLockTimeout(5000);
                 refs.add(transactionOptions);
                 db = TransactionDB.open(rocksdbOptions,
-                        transactionOptions,
+                    transactionOptions,
-                        definitiveDbPathString,
+                    definitiveDbPath.toString(),
-                        descriptors,
+                    descriptors,
-                        handles
+                    handles
                 );
             }
 
@@ -489,7 +531,9 @@ public class RocksDBLoader {
             } catch (RocksDBException ex) {
                 logger.log(Level.FINE, "Failed to obtain stats", ex);
             }
-            return TransactionalDB.create(definitiveDbPathString, db);
+            return TransactionalDB.create(definitiveDbPath.toString(), db);
+        } catch (IOException ex) {
+            throw new it.cavallium.rockserver.core.common.RocksDBException(it.cavallium.rockserver.core.common.RocksDBException.RocksDBErrorType.ROCKSDB_LOAD_ERROR, "Failed to load rocksdb", ex);
         } catch (RocksDBException ex) {
             throw new it.cavallium.rockserver.core.common.RocksDBException(it.cavallium.rockserver.core.common.RocksDBException.RocksDBErrorType.ROCKSDB_LOAD_ERROR, "Failed to load rocksdb", ex);
         } catch (GestaltException e) {
@@ -499,29 +543,6 @@ public class RocksDBLoader {
 
     record DbPathRecord(Path path, long targetSize) {}
 
-    private static List<DbPathRecord> convertPaths(Path databasesDirPath, Path path, List<VolumeConfig> volumes) throws GestaltException {
-        var paths = new ArrayList<DbPathRecord>(volumes.size());
-        if (volumes.isEmpty()) {
-            return List.of(new DbPathRecord(databasesDirPath.resolve(path.getFileName() + "_hot"),
-                            0), // Legacy
-                    new DbPathRecord(databasesDirPath.resolve(path.getFileName() + "_cold"),
-                            0), // Legacy
-                    new DbPathRecord(databasesDirPath.resolve(path.getFileName() + "_colder"),
-                            1000L * 1024L * 1024L * 1024L)  // 1000GiB
-            ); // Legacy
-        }
-        for (var volume : volumes) {
-            Path volumePath;
-            if (volume.volumePath().isAbsolute()) {
-                volumePath = volume.volumePath();
-            } else {
-                volumePath = databasesDirPath.resolve(volume.volumePath());
-            }
-            paths.add(new DbPathRecord(volumePath, volume.targetSizeBytes()));
-        }
-        return paths;
-    }
-
     public static boolean isDisableAutoCompactions() {
         return parseBoolean(System.getProperty("it.cavallium.dbengine.compactions.auto.disable", "false"));
     }

src/main/java/it/cavallium/rockserver/core/impl/rocksdb/RocksDBMetadata.java

@@ -0,0 +1,31 @@
+package it.cavallium.rockserver.core.impl.rocksdb;
+
+import java.io.IOException;
+import java.util.Objects;
+import java.util.Properties;
+
+public class RocksDBMetadata {
+
+	private static Exception LOAD_EXCEPTION = null;
+	private static String VERSION_HASH = null;
+
+	static {
+		try {
+			try (var is = RocksDBMetadata.class.getClassLoader().getResourceAsStream("it/cavallium/rockserver/core/resources/build.properties")) {
+				assert is != null;
+				var props = new Properties();
+				props.load(is);
+				VERSION_HASH = Objects.requireNonNull(props.getProperty("rockserver.core.rocksdb.version"));
+			}
+		} catch (IOException | NullPointerException e) {
+			LOAD_EXCEPTION = e;
+		}
+	}
+
+	public static String getRocksDBVersionHash() {
+		if (LOAD_EXCEPTION != null) {
+			throw new IllegalStateException(LOAD_EXCEPTION);
+		}
+		return VERSION_HASH;
+	}
+}

src/main/resources/it/cavallium/rockserver/core/resources/default.conf

@@ -17,7 +17,14 @@ database: {
     # If "cacheIndexAndFilterBlocks" is false, the memory will rise when the number of open files rises.
     maximum-open-files: -1
     # RocksDB data volumes.
-    volumes: []
+    volumes: [
+      {
+        # Path of the volume
+        volume-path: "./volume"
+        # Maximum size of the volume. This property is ignored on the last volume
+        target-size: "10TiB"
+      }
+    ]
     # Optimistic transactions
     optimistic: true
     # Database block cache size