@Override public DBOptions setAllowMmapWrites( final boolean allowMmapWrites) { assert(isOwningHandle()); setAllowMmapWrites(nativeHandle_, allowMmapWrites); return this; }
.setAdviseRandomOnOpen(true)// .setAllowMmapWrites(safeToUseMMappedFiles)// .setBytesPerSync(64 * 1024 * 1024);
.setAdviseRandomOnOpen(true)// .setAllowMmapWrites(safeToUseMMappedFiles)// .setBytesPerSync(64 * 1024 * 1024);
/** * Builds RocksDb {@link DBOptions}. * * @param maxBackgroundFlushes * high priority threads, usually 1 or 2 would be enough * @param maxBackgroundCompactions * low priority threads, between 1 - num_cpu_cores * @param maxBackgroundThreads * {@code >= maxBackgroundFlushes, maxBackgroundCompactions} * @param maxLogFileSize * if equal to {@code 0}, write all logs to one file and roll by time * @return */ public static DBOptions buildDbOptions(int maxBackgroundFlushes, int maxBackgroundCompactions, int maxBackgroundThreads, long maxLogFileSize) { DBOptions dbOptions = new DBOptions(); dbOptions.setCreateIfMissing(true).setCreateMissingColumnFamilies(true) .setErrorIfExists(false); dbOptions.setMaxBackgroundFlushes(maxBackgroundFlushes) .setMaxBackgroundCompactions(maxBackgroundCompactions) .setIncreaseParallelism(maxBackgroundThreads); dbOptions.setAllowMmapReads(true).setAllowMmapWrites(true); dbOptions.setMaxOpenFiles(-1); dbOptions.setKeepLogFileNum(100).setLogFileTimeToRoll(3600) .setMaxLogFileSize(maxLogFileSize); return dbOptions; }