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rust-rocksdb/README.md

3.4 KiB

rust-rocksdb

running

Install RocksDB. rust-rocksdb has been tested with version 3.8.1 on linux and OSX.

Cargo.toml
[dependencies]
rocksdb = "~0.0.2"
Code
extern crate rocksdb;
use rocksdb::RocksDB;

fn main() {
    let db = RocksDB::open_default("/path/for/rocksdb/storage").unwrap();
    db.put(b"my key", b"my value");
    db.get(b"my key")
        .map( |value| { 
            println!("retrieved value {}", value.to_utf8().unwrap())
        })
        .on_absent( || { println!("value not found") })
        .on_error( |e| { println!("operational problem encountered: {}", e) });

    db.delete(b"my key");
    db.close();
}
Rustic Merge Operator
extern crate rocksdb;
use rocksdb::{RocksDBOptions, RocksDB, MergeOperands};

fn concat_merge(new_key: &[u8], existing_val: Option<&[u8]>,
    mut operands: &mut MergeOperands) -> Vec<u8> {
    let mut result: Vec<u8> = Vec::with_capacity(operands.size_hint().val0());
    match existing_val {
        Some(v) => result.push_all(v),
        None => (),
    }
    for op in operands {
        result.push_all(op);
    }
    result
}

fn main() {
    let path = "/path/to/rocksdb";
    let opts = RocksDBOptions::new();
    opts.create_if_missing(true);
    opts.add_merge_operator("test operator", concat_merge);
    let db = RocksDB::open(opts, path).unwrap();
    let p = db.put(b"k1", b"a");
    db.merge(b"k1", b"b");
    db.merge(b"k1", b"c");
    db.merge(b"k1", b"d");
    db.merge(b"k1", b"efg");
    let r = db.get(b"k1");
    assert!(r.unwrap().to_utf8().unwrap() == "abcdefg");
    db.close();
}
Apply Some Tunings

Please read the official tuning guide, and most importantly, measure performance under realistic workloads with realistic hardware.

use rocksdb::{RocksDBOptions, RocksDB, new_bloom_filter};
use rocksdb::RocksDBCompactionStyle::RocksDBUniversalCompaction;

fn tuned_for_somebody_elses_disk() -> RocksDB {
    let path = "_rust_rocksdb_optimizetest";
    let opts = RocksDBOptions::new();
    opts.create_if_missing(true);
    opts.set_block_size(524288);
    opts.set_max_open_files(10000);
    opts.set_use_fsync(false);
    opts.set_bytes_per_sync(8388608);
    opts.set_disable_data_sync(false);
    opts.set_block_cache_size_mb(1024);
    opts.set_table_cache_num_shard_bits(6);
    opts.set_max_write_buffer_number(32);
    opts.set_write_buffer_size(536870912);
    opts.set_target_file_size_base(1073741824);
    opts.set_min_write_buffer_number_to_merge(4);
    opts.set_level_zero_stop_writes_trigger(2000);
    opts.set_level_zero_slowdown_writes_trigger(0);
    opts.set_compaction_style(RocksDBUniversalCompaction);
    opts.set_max_background_compactions(4);
    opts.set_max_background_flushes(4);
    opts.set_filter_deletes(false);
    opts.set_disable_auto_compactions(true);

    let filter = new_bloom_filter(10);
    opts.set_filter(filter);

    RocksDB::open(opts, path).unwrap()
}

status

  • basic open/put/get/delete/close
  • linux support
  • rocksdb compiled via cargo
  • OSX support
  • rustic merge operator
  • compaction filter, style
  • LRU cache
  • destroy/repair
  • batch
  • iterator
  • range
  • create/release snapshot
  • column family operations
  • comparator
  • slicetransform
  • windows support

Feedback and pull requests welcome!