可以通过设置 RocksDB 的 use_direct_reads 参数来使用 direct io 读，这样就绕过系统的 page cache，...
//创建迭代器 rocksdb::Iterator* it = db->NewIterator(option); //Seek与Next移动迭代器 for (...
HDD, 100TB DB DB大小为86G,HDD存储,在一个具有100TB数据的node上模拟小内存,使用Direct IO(关闭OS file cache),block cache大小设置为60MB。分片后吞吐提升了11倍( 5 op/s提升到55 op/s)。 /db_bench--benchmarks="readwhilewriting[X3],stats"--use_direct_reads=1-compaction_readahead_size1048576...
--use_direct_reads=0 \ --use_direct_io_for_flush_and_compaction=0 \ --verify_checksum=1 \ --seed=1576170874 \ --stats_per_interval=1 \ --stats_interval_seconds=60 \ --histogram=1 The Overwrite workload The overwrite workload is a write only workload that updates an alre...
.setUseDirectReads(true); } 代码示例来源:origin: org.apache.kylin/kylin-core-dictionary public RocksDBLookupBuilder(TableDesc tableDesc, String[] keyColumns, String dbPath) { this.tableDesc = tableDesc; this.encoder = new RocksDBLookupRowEncoder(tableDesc, keyColumns); this.dbPath = dbPath; ...
406 // disabled (ReadOptions::fill_cache = false) and direct IO is 407 // enabled (DBOptions::use_direct_reads = true). 408 // The default mode is the best tradeoff for most use cases. 409 // This option only affects newly written tables. 410 // 411 // The index contains a...
Direct Reads and Writes: Enable direct reads and writes to potentially reduce overhead. Optimize Compaction: Use optimized compaction settings to manage space more efficiently [2]. These changes should help in reducing the metadata footprint and saving disk space when using RocksDB with HugeGraph....
Options::use_direct_writes and Options::use_direct_reads are now ready to use. (Experimental) Two-level indexing that partition the index and creates a 2nd level index on the partitions. The feature can be enabled by setting kTwoLevelIndexSearch as IndexType and configuring index_per_partition...
filtering. When Options.prefix_extractor is set, a hash of the prefix is also added to the Bloom. An Iterator that specifies a key-prefix (in ReadOptions) will use the Bloom Filter to avoid looking into data files that do not contain keys with the specified key-prefix. See Prefix-Seek....
RocksDB presents a real-world use case for optimizing using Intel® Optane™ Persistent Memory (PMem) and the Persistent Memory Development Kit (PMDK).