pmem-rocksdb

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RocksDB: A Persistent Key-Value Store for Flash and RAM Storage

Intel optimized features for pmem

These are experimental features, don't use them in production environment.

Build

make ROCKSDB_ON_DCPMM=1 install-static -j

Reuse obsoleted sst files

To avoid page-fault and page-zeroing overhead on pmem

usage:

options.recycle_dcpmm_sst = true;

Write wal with nt-store

usage:

options.env = rocksdb::NewDCPMMEnv(rocksdb::DCPMMEnvOptions());

Key-value separation

allocate values with libpmemobj

usage:

options.env = rocksdb::NewDCPMMEnv(rocksdb::DCPMMEnvOptions());

options.dcpmm_kvs_enable = true;

options.dcpmm_kvs_mmapped_file_fullpath = {path to libpmemobj file};

options.dcpmm_kvs_mmapped_file_size = {libpmemobj file size};

options.dcpmm_kvs_value_thres = 64; // minimal size to do kv sep

options.dcpmm_compress_value = false;

Optimized mmap read for pmem

usage:

options.use_mmap_read = true;

options.cache_index_and_filter_blocks_for_mmap_read = true;

rocksdb::BlockBasedTableOptions bbto;

bbto.block_size = 256 (512,1024, ... etc);

options.table_factory.reset(rocksdb::NewBlockBasedTableFactory(bbto));

RocksDB is developed and maintained by Facebook Database Engineering Team. It is built on earlier work on LevelDB by Sanjay Ghemawat ([email protected]) and Jeff Dean ([email protected])

This code is a library that forms the core building block for a fast key-value server, especially suited for storing data on flash drives. It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF) and Space-Amplification-Factor (SAF). It has multi-threaded compactions, making it especially suitable for storing multiple terabytes of data in a single database.

Start with example usage here: https://github.com/facebook/rocksdb/tree/master/examples

See the github wiki for more explanation.

The public interface is in include/. Callers should not include or rely on the details of any other header files in this package. Those internal APIs may be changed without warning.

Design discussions are conducted in https://www.facebook.com/groups/rocksdb.dev/ and https://rocksdb.slack.com/

License

RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory). You may select, at your option, one of the above-listed licenses.