428 lines
14 KiB
Java
428 lines
14 KiB
Java
package it.cavallium.dbengine.database.disk;
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import it.cavallium.dbengine.database.Column;
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import it.cavallium.dbengine.database.LLKeyValueDatabase;
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import it.cavallium.dbengine.database.LLSnapshot;
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import it.cavallium.dbengine.database.UpdateMode;
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import java.io.File;
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import java.io.IOException;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.nio.file.attribute.BasicFileAttributes;
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import java.time.Duration;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.atomic.AtomicLong;
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import org.rocksdb.BlockBasedTableConfig;
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import org.rocksdb.BloomFilter;
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import org.rocksdb.ColumnFamilyDescriptor;
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import org.rocksdb.ColumnFamilyHandle;
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import org.rocksdb.CompactionStyle;
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import org.rocksdb.CompressionType;
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import org.rocksdb.DBOptions;
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import org.rocksdb.DbPath;
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import org.rocksdb.FlushOptions;
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import org.rocksdb.Options;
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import org.rocksdb.RocksDB;
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import org.rocksdb.RocksDBException;
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import org.rocksdb.Snapshot;
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import org.rocksdb.WALRecoveryMode;
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import reactor.core.publisher.Mono;
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import reactor.core.scheduler.Scheduler;
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import reactor.core.scheduler.Schedulers;
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public class LLLocalKeyValueDatabase implements LLKeyValueDatabase {
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static {
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RocksDB.loadLibrary();
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}
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private static final ColumnFamilyDescriptor DEFAULT_COLUMN_FAMILY = new ColumnFamilyDescriptor(
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RocksDB.DEFAULT_COLUMN_FAMILY);
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private final Scheduler dbScheduler;
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private final Path dbPath;
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private final String name;
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private RocksDB db;
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private final Map<Column, ColumnFamilyHandle> handles;
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private final ConcurrentHashMap<Long, Snapshot> snapshotsHandles = new ConcurrentHashMap<>();
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private final AtomicLong nextSnapshotNumbers = new AtomicLong(1);
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public LLLocalKeyValueDatabase(String name, Path path, List<Column> columns, List<ColumnFamilyHandle> handles,
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boolean crashIfWalError, boolean lowMemory) throws IOException {
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Options options = openRocksDb(path, crashIfWalError, lowMemory);
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try {
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List<ColumnFamilyDescriptor> descriptors = new LinkedList<>();
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descriptors
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.add(new ColumnFamilyDescriptor(RocksDB.DEFAULT_COLUMN_FAMILY));
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for (Column column : columns) {
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descriptors
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.add(new ColumnFamilyDescriptor(column.getName().getBytes(StandardCharsets.US_ASCII)));
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}
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// Get databases directory path
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Path databasesDirPath = path.toAbsolutePath().getParent();
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String dbPathString = databasesDirPath.toString() + File.separatorChar + path.getFileName();
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Path dbPath = Paths.get(dbPathString);
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this.dbPath = dbPath;
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this.name = name;
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this.dbScheduler = Schedulers.newBoundedElastic(Runtime.getRuntime().availableProcessors(),
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Schedulers.DEFAULT_BOUNDED_ELASTIC_QUEUESIZE,
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"db-" + name,
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60,
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true
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);
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createIfNotExists(descriptors, options, dbPath, dbPathString);
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// Create all column families that don't exist
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createAllColumns(descriptors, options, dbPathString);
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// a factory method that returns a RocksDB instance
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this.db = RocksDB.open(new DBOptions(options), dbPathString, descriptors, handles);
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this.handles = new HashMap<>();
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for (int i = 0; i < columns.size(); i++) {
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this.handles.put(columns.get(i), handles.get(i));
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}
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flushDb(db, handles);
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} catch (RocksDBException ex) {
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throw new IOException(ex);
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}
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}
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@Override
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public String getDatabaseName() {
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return name;
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}
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private void flushAndCloseDb(RocksDB db, List<ColumnFamilyHandle> handles)
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throws RocksDBException {
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flushDb(db, handles);
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for (ColumnFamilyHandle handle : handles) {
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handle.close();
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}
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db.closeE();
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}
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private void flushDb(RocksDB db, List<ColumnFamilyHandle> handles) throws RocksDBException {
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// force flush the database
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for (int i = 0; i < 2; i++) {
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db.flush(new FlushOptions().setWaitForFlush(true).setAllowWriteStall(true), handles);
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db.flushWal(true);
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db.syncWal();
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}
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// end force flush
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}
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@SuppressWarnings("CommentedOutCode")
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private static Options openRocksDb(Path path, boolean crashIfWalError, boolean lowMemory)
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throws IOException {
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// Get databases directory path
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Path databasesDirPath = path.toAbsolutePath().getParent();
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// Create base directories
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if (Files.notExists(databasesDirPath)) {
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Files.createDirectories(databasesDirPath);
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}
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// the Options class contains a set of configurable DB options
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// that determines the behaviour of the database.
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var options = new Options();
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options.setCreateIfMissing(true);
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options.setCompactionStyle(CompactionStyle.LEVEL);
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options.setLevelCompactionDynamicLevelBytes(true);
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options.setTargetFileSizeBase(64 * 1024 * 1024); // 64MiB sst file
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options.setMaxBytesForLevelBase(4 * 256 * 1024 * 1024); // 4 times the sst file
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options.setCompressionType(CompressionType.SNAPPY_COMPRESSION);
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options.setManualWalFlush(false);
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options.setMinWriteBufferNumberToMerge(3);
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options.setMaxWriteBufferNumber(4);
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options.setWalTtlSeconds(30); // flush wal after 30 seconds
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options.setAvoidFlushDuringShutdown(false); // Flush all WALs during shutdown
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options.setAvoidFlushDuringRecovery(false); // Flush all WALs during startup
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options.setWalRecoveryMode(crashIfWalError
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? WALRecoveryMode.AbsoluteConsistency
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: WALRecoveryMode.PointInTimeRecovery); // Crash if the WALs are corrupted.Default: TolerateCorruptedTailRecords
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options.setDeleteObsoleteFilesPeriodMicros(20 * 1000000); // 20 seconds
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options.setPreserveDeletes(false);
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options.setKeepLogFileNum(10);
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// Direct I/O parameters. Removed because they use too much disk.
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//options.setUseDirectReads(true);
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//options.setUseDirectIoForFlushAndCompaction(true);
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//options.setCompactionReadaheadSize(2 * 1024 * 1024); // recommend at least 2MB
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//options.setWritableFileMaxBufferSize(1024 * 1024); // 1MB by default
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if (lowMemory) {
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// LOW MEMORY
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options
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.setBytesPerSync(1024 * 1024)
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.setWalBytesPerSync(1024 * 1024)
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.setIncreaseParallelism(1)
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.setMaxOpenFiles(2)
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.optimizeLevelStyleCompaction(1024 * 1024) // 1MiB of ram will be used for level style compaction
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.setWriteBufferSize(1024 * 1024) // 1MB
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.setWalSizeLimitMB(16) // 16MB
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.setMaxTotalWalSize(1024L * 1024L * 1024L) // 1GiB max wal directory size
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.setDbPaths(List.of(new DbPath(databasesDirPath.resolve(path.getFileName() + "_hot"),
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400L * 1024L * 1024L * 1024L), // 400GiB
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new DbPath(databasesDirPath.resolve(path.getFileName() + "_cold"),
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600L * 1024L * 1024L * 1024L))) // 600GiB
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;
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} else {
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// HIGH MEMORY
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options
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.setAllowConcurrentMemtableWrite(true)
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.setEnableWriteThreadAdaptiveYield(true)
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.setIncreaseParallelism(Runtime.getRuntime().availableProcessors())
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.setBytesPerSync(10 * 1024 * 1024)
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.setWalBytesPerSync(10 * 1024 * 1024)
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.optimizeLevelStyleCompaction(
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128 * 1024 * 1024) // 128MiB of ram will be used for level style compaction
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.setWriteBufferSize(128 * 1024 * 1024) // 128MB
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.setWalSizeLimitMB(1024) // 1024MB
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.setMaxTotalWalSize(8L * 1024L * 1024L * 1024L) // 8GiB max wal directory size
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.setDbPaths(List.of(new DbPath(databasesDirPath.resolve(path.getFileName() + "_hot"),
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400L * 1024L * 1024L * 1024L), // 400GiB
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new DbPath(databasesDirPath.resolve(path.getFileName() + "_cold"),
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600L * 1024L * 1024L * 1024L))) // 600GiB
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;
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}
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final org.rocksdb.BloomFilter bloomFilter = new BloomFilter(10, false);
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final BlockBasedTableConfig tableOptions = new BlockBasedTableConfig();
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tableOptions.setFilterPolicy(bloomFilter);
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options.setTableFormatConfig(tableOptions);
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return options;
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}
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private void createAllColumns(List<ColumnFamilyDescriptor> totalDescriptors, Options options,
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String dbPathString) throws RocksDBException {
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List<byte[]> columnFamiliesToCreate = new LinkedList<>();
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for (ColumnFamilyDescriptor descriptor : totalDescriptors) {
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columnFamiliesToCreate.add(descriptor.getName());
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}
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List<byte[]> existingColumnFamilies = RocksDB.listColumnFamilies(options, dbPathString);
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columnFamiliesToCreate.removeIf((columnFamilyName) -> {
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for (byte[] cfn : existingColumnFamilies) {
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if (Arrays.equals(cfn, columnFamilyName)) {
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return true;
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}
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}
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return false;
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});
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List<ColumnFamilyDescriptor> descriptors = new LinkedList<>();
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descriptors.add(new ColumnFamilyDescriptor(RocksDB.DEFAULT_COLUMN_FAMILY));
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for (byte[] existingColumnFamily : existingColumnFamilies) {
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descriptors.add(new ColumnFamilyDescriptor(existingColumnFamily));
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}
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var handles = new LinkedList<ColumnFamilyHandle>();
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/*
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SkipStatsUpdateOnDbOpen = true because this RocksDB.open session is used only to add just some columns
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*/
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//var dbOptionsFastLoadSlowEdit = new DBOptions(options.setSkipStatsUpdateOnDbOpen(true));
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this.db = RocksDB.open(new DBOptions(options), dbPathString, descriptors, handles);
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for (byte[] name : columnFamiliesToCreate) {
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db.createColumnFamily(new ColumnFamilyDescriptor(name)).close();
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}
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flushAndCloseDb(db, handles);
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}
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private void createIfNotExists(List<ColumnFamilyDescriptor> descriptors, Options options,
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Path dbPath, String dbPathString) throws RocksDBException {
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if (Files.notExists(dbPath)) {
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// Check if handles are all different
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var descriptorsSet = new HashSet<>(descriptors);
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if (descriptorsSet.size() != descriptors.size()) {
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throw new IllegalArgumentException("Descriptors must be unique!");
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}
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List<ColumnFamilyDescriptor> descriptorsToCreate = new LinkedList<>(descriptors);
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descriptorsToCreate
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.removeIf((cf) -> Arrays.equals(cf.getName(), DEFAULT_COLUMN_FAMILY.getName()));
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/*
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SkipStatsUpdateOnDbOpen = true because this RocksDB.open session is used only to add just some columns
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*/
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//var dbOptionsFastLoadSlowEdit = options.setSkipStatsUpdateOnDbOpen(true);
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LinkedList<ColumnFamilyHandle> handles = new LinkedList<>();
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this.db = RocksDB.open(options, dbPathString);
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for (ColumnFamilyDescriptor columnFamilyDescriptor : descriptorsToCreate) {
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handles.add(db.createColumnFamily(columnFamilyDescriptor));
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}
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flushAndCloseDb(db, handles);
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}
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}
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@Override
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public Mono<LLLocalSingleton> getSingleton(byte[] singletonListColumnName, byte[] name, byte[] defaultValue) {
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return Mono
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.fromCallable(() -> new LLLocalSingleton(db,
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handles.get(Column.special(Column.toString(singletonListColumnName))),
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(snapshot) -> snapshotsHandles.get(snapshot.getSequenceNumber()),
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LLLocalKeyValueDatabase.this.name,
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name,
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dbScheduler,
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defaultValue
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))
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.onErrorMap(IOException::new)
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.subscribeOn(dbScheduler);
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}
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@Override
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public Mono<LLLocalDictionary> getDictionary(byte[] columnName, UpdateMode updateMode) {
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return Mono
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.fromCallable(() -> new LLLocalDictionary(db,
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handles.get(Column.special(Column.toString(columnName))),
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name,
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dbScheduler,
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(snapshot) -> snapshotsHandles.get(snapshot.getSequenceNumber()),
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updateMode
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))
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.subscribeOn(dbScheduler);
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}
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@Override
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public Mono<Long> getProperty(String propertyName) {
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return Mono.fromCallable(() -> db.getAggregatedLongProperty(propertyName))
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.onErrorMap(IOException::new)
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.subscribeOn(dbScheduler);
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}
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@Override
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public Mono<LLSnapshot> takeSnapshot() {
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return Mono
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.fromCallable(() -> {
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var snapshot = db.getSnapshot();
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long currentSnapshotSequenceNumber = nextSnapshotNumbers.getAndIncrement();
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this.snapshotsHandles.put(currentSnapshotSequenceNumber, snapshot);
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return new LLSnapshot(currentSnapshotSequenceNumber);
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})
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.subscribeOn(dbScheduler);
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}
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@Override
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public Mono<Void> releaseSnapshot(LLSnapshot snapshot) {
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return Mono
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.<Void>fromCallable(() -> {
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Snapshot dbSnapshot = this.snapshotsHandles.remove(snapshot.getSequenceNumber());
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if (dbSnapshot == null) {
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throw new IOException("Snapshot " + snapshot.getSequenceNumber() + " not found!");
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}
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db.releaseSnapshot(dbSnapshot);
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return null;
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})
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.subscribeOn(dbScheduler);
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}
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@Override
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public Mono<Void> close() {
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return Mono
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.<Void>fromCallable(() -> {
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try {
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flushAndCloseDb(db, new ArrayList<>(handles.values()));
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deleteUnusedOldLogFiles();
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} catch (RocksDBException e) {
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throw new IOException(e);
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}
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return null;
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})
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.onErrorMap(IOException::new)
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.subscribeOn(dbScheduler);
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}
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/**
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* Call this method ONLY AFTER flushing completely a db and closing it!
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*/
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@SuppressWarnings("unused")
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private void deleteUnusedOldLogFiles() {
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Path basePath = dbPath;
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try {
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Files
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.walk(basePath, 1)
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.filter(p -> !p.equals(basePath))
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.filter(p -> {
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var fileName = p.getFileName().toString();
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if (fileName.startsWith("LOG.old.")) {
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var parts = fileName.split("\\.");
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if (parts.length == 3) {
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try {
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long nameSuffix = Long.parseUnsignedLong(parts[2]);
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return true;
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} catch (NumberFormatException ex) {
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return false;
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}
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}
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}
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if (fileName.endsWith(".log")) {
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var parts = fileName.split("\\.");
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if (parts.length == 2) {
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try {
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int name = Integer.parseUnsignedInt(parts[0]);
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return true;
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} catch (NumberFormatException ex) {
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return false;
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}
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}
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}
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return false;
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})
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.filter(p -> {
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try {
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BasicFileAttributes attrs = Files.readAttributes(p, BasicFileAttributes.class);
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if (attrs.isRegularFile() && !attrs.isSymbolicLink() && !attrs.isDirectory()) {
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long ctime = attrs.creationTime().toMillis();
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long atime = attrs.lastAccessTime().toMillis();
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long mtime = attrs.lastModifiedTime().toMillis();
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long lastTime = Math.max(Math.max(ctime, atime), mtime);
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long safeTime;
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if (p.getFileName().toString().startsWith("LOG.old.")) {
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safeTime = System.currentTimeMillis() - Duration.ofHours(24).toMillis();
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} else {
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safeTime = System.currentTimeMillis() - Duration.ofHours(12).toMillis();
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}
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if (lastTime < safeTime) {
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return true;
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}
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}
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} catch (IOException ex) {
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ex.printStackTrace();
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return false;
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}
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return false;
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})
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.forEach(path -> {
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try {
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Files.deleteIfExists(path);
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System.out.println("Deleted log file \"" + path + "\"");
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} catch (IOException e) {
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e.printStackTrace();
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}
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});
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} catch (IOException ex) {
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ex.printStackTrace();
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}
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}
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}
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