public RocksDbContext(string path = "ChainLachain")
{
_dbpath = path;
_writeOptions = new WriteOptions();
_writeOptions.DisableWal(0);
_writeOptions.SetSync(true);
var options = new DbOptions().SetCreateIfMissing();
_rocksDb = RocksDb.Open(options, _dbpath);
}
/// <summary>
/// Create rocksdb config and open rocksdb database.
/// </summary>
/// <param name="context"></param>
protected void OpenDatabase(ProcessorContext context)
{
DbOptions dbOptions = new DbOptions();
ColumnFamilyOptions columnFamilyOptions = new ColumnFamilyOptions();
writeOptions = new WriteOptions();
BlockBasedTableOptions tableConfig = new BlockBasedTableOptions();
RocksDbOptions rocksDbOptions = new RocksDbOptions(dbOptions, columnFamilyOptions);
tableConfig.SetBlockCache(RocksDbSharp.Cache.CreateLru(BLOCK_CACHE_SIZE));
tableConfig.SetBlockSize(BLOCK_SIZE);
tableConfig.SetFilterPolicy(BloomFilterPolicy.Create());
rocksDbOptions.SetOptimizeFiltersForHits(1);
rocksDbOptions.SetBlockBasedTableFactory(tableConfig);
rocksDbOptions.SetCompression(COMPRESSION_TYPE);
rocksDbOptions.SetWriteBufferSize(WRITE_BUFFER_SIZE);
rocksDbOptions.SetCompactionStyle(COMPACTION_STYLE);
rocksDbOptions.SetMaxWriteBufferNumber(MAX_WRITE_BUFFERS);
rocksDbOptions.SetCreateIfMissing(true);
rocksDbOptions.SetErrorIfExists(false);
rocksDbOptions.SetInfoLogLevel(RocksLogLevel.ERROR);
// 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).
rocksDbOptions.IncreaseParallelism(Math.Max(Environment.ProcessorCount, 2));
// TODO : wrap writeOptions in rocksDbOptions too
writeOptions.DisableWal(1);
context.Configuration.RocksDbConfigHandler?.Invoke(Name, rocksDbOptions);
rocksDbOptions.SetMinWriteBufferNumberToMerge(2);
DbDir = new DirectoryInfo(Path.Combine(context.StateDir, parentDir, Name));
Directory.CreateDirectory(DbDir.FullName);
OpenRocksDb(dbOptions, columnFamilyOptions);
IsOpen = true;
}