Java Code Examples for org.rocksdb.BlockBasedTableConfig#setBlockCache()

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Example 1
Source File: RocksDBCache.java    From kcache with Apache License 2.0 4 votes vote down vote up 
private void openDB() {
    // initialize the default rocksdb options

    final DBOptions dbOptions = new DBOptions();
    final ColumnFamilyOptions columnFamilyOptions = new ColumnFamilyOptions();
    userSpecifiedOptions = new RocksDBGenericOptionsToDbOptionsColumnFamilyOptionsAdapter(dbOptions, columnFamilyOptions);
    userSpecifiedOptions.setComparator(new RocksDBKeySliceComparator<>(keySerde, comparator));

    final BlockBasedTableConfig tableConfig = new BlockBasedTableConfig();
    cache = new LRUCache(BLOCK_CACHE_SIZE);
    tableConfig.setBlockCache(cache);
    tableConfig.setBlockSize(BLOCK_SIZE);

    filter = new BloomFilter();
    tableConfig.setFilterPolicy(filter);

    userSpecifiedOptions.optimizeFiltersForHits();
    userSpecifiedOptions.setTableFormatConfig(tableConfig);
    userSpecifiedOptions.setWriteBufferSize(WRITE_BUFFER_SIZE);
    userSpecifiedOptions.setCompressionType(COMPRESSION_TYPE);
    userSpecifiedOptions.setCompactionStyle(COMPACTION_STYLE);
    userSpecifiedOptions.setMaxWriteBufferNumber(MAX_WRITE_BUFFERS);
    userSpecifiedOptions.setCreateIfMissing(true);
    userSpecifiedOptions.setErrorIfExists(false);
    userSpecifiedOptions.setInfoLogLevel(InfoLogLevel.ERROR_LEVEL);
    // this is the recommended way to increase parallelism in RocksDb
    // note that the current implementation of setIncreaseParallelism affects the number
    // of compaction threads but not flush threads (the latter remains one). Also
    // the parallelism value needs to be at least two because of the code in
    // https://github.com/facebook/rocksdb/blob/62ad0a9b19f0be4cefa70b6b32876e764b7f3c11/util/options.cc#L580
    // subtracts one from the value passed to determine the number of compaction threads
    // (this could be a bug in the RocksDB code and their devs have been contacted).
    userSpecifiedOptions.setIncreaseParallelism(Math.max(Runtime.getRuntime().availableProcessors(), 2));

    wOptions = new WriteOptions();
    wOptions.setDisableWAL(true);

    fOptions = new FlushOptions();
    fOptions.setWaitForFlush(true);

    dbDir = new File(new File(rootDir, parentDir), name);

    try {
        Files.createDirectories(dbDir.getParentFile().toPath());
        Files.createDirectories(dbDir.getAbsoluteFile().toPath());
    } catch (final IOException fatal) {
        throw new CacheInitializationException("Could not create directories", fatal);
    }

    openRocksDB(dbOptions, columnFamilyOptions);
    open = true;
}