rexrocksdb 0.3.2

Fork of rust wrapper for Facebook's RocksDB embeddable database.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202

// Copyright 2014 Tyler Neely
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

extern crate rexrocksdb;
use rexrocksdb::{ColumnFamilyOptions, DBOptions, MergeOperands, Writable, DB};

// fn snapshot_test() {
//    let path = "_rust_rocksdb_iteratortest";
//    {
//        let mut db = DB::open_default(path).unwrap();
//        let p = db.put(b"k1", b"v1111");
//        assert!(p.is_ok());
//        let p = db.put(b"k2", b"v2222");
//        assert!(p.is_ok());
//        let p = db.put(b"k3", b"v3333");
//        assert!(p.is_ok());
//        let mut snap = db.snapshot();
//        let mut view1 = snap.iterator();
//        println!("See the output of the first iter");
//        for (k,v) in view1.from_start() {
// println!("Hello {}: {}", std::str::from_utf8(k).unwrap(),
// std::str::from_utf8(v).unwrap());
//        };
//        for (k,v) in view1.from_start() {
// println!("Hello {}: {}", std::str::from_utf8(k).unwrap(),
// std::str::from_utf8(v).unwrap());
//        };
//        for (k,v) in view1.from_end() {
// println!("Hello {}: {}", std::str::from_utf8(k).unwrap(),
// std::str::from_utf8(v).unwrap());
//        };
//    }
//    let opts = Options::new();
//    assert!(DB::destroy(&opts, path).is_ok());
// }

#[cfg(not(feature = "valgrind"))]
fn main() {
    let path = "/tmp/rust-rocksdb";
    let db = DB::open_default(path).unwrap();
    assert!(db.put(b"my key", b"my value").is_ok());
    match db.get(b"my key") {
        Ok(Some(value)) => match value.to_utf8() {
            Some(v) => println!("retrieved utf8 value: {}", v),
            None => println!("did not read valid utf-8 out of the db"),
        },
        Ok(None) => panic!("value not present!"),
        Err(e) => println!("error retrieving value: {}", e),
    }

    assert!(db.delete(b"my key").is_ok());

    custom_merge();
}

fn concat_merge(_: &[u8], existing_val: Option<&[u8]>, operands: &mut MergeOperands) -> Vec<u8> {
    let mut result: Vec<u8> = Vec::with_capacity(operands.size_hint().0);
    match existing_val {
        Some(v) => for e in v {
            result.push(*e)
        },
        None => (),
    }
    for op in operands {
        for e in op {
            result.push(*e);
        }
    }
    result
}

fn custom_merge() {
    let path = "_rust_rocksdb_mergetest";
    let mut opts = DBOptions::new();
    opts.create_if_missing(true);
    let mut cf_opts = ColumnFamilyOptions::new();
    cf_opts.add_merge_operator("test operator", concat_merge);
    {
        let db = DB::open_cf(opts, path, vec![("default", cf_opts)]).unwrap();
        db.put(b"k1", b"a").unwrap();
        db.merge(b"k1", b"b").unwrap();
        db.merge(b"k1", b"c").unwrap();
        db.merge(b"k1", b"d").unwrap();
        db.merge(b"k1", b"efg").unwrap();
        db.merge(b"k1", b"h").unwrap();
        match db.get(b"k1") {
            Ok(Some(value)) => match value.to_utf8() {
                Some(v) => println!("retrieved utf8 value: {}", v),
                None => println!("did not read valid utf-8 out of the db"),
            },
            Ok(None) => panic!("value not present!"),
            Err(e) => println!("error retrieving value: {}", e),
        }
    }
    let opts = DBOptions::new();
    DB::destroy(&opts, path).is_ok();
}

#[cfg(test)]
mod tests {
    use rocksdb::{BlockBasedOptions, ColumnFamilyOptions, DBCompressionType, DBOptions, DB};
    use rocksdb::DBCompactionStyle;
    use rocksdb::DBRecoveryMode;

    #[allow(dead_code)]
    fn tuned_for_somebody_elses_disk(
        path: &str,
        mut opts: DBOptions,
        blockopts: &mut BlockBasedOptions,
    ) -> DB {
        let per_level_compression: [DBCompressionType; 7] = [
            DBCompressionType::No,
            DBCompressionType::No,
            DBCompressionType::No,
            DBCompressionType::Lz4,
            DBCompressionType::Lz4,
            DBCompressionType::Lz4,
            DBCompressionType::Lz4,
        ];
        let mut cf_opts = ColumnFamilyOptions::new();
        opts.create_if_missing(true);
        opts.set_max_open_files(10000);
        opts.set_use_fsync(false);
        opts.set_bytes_per_sync(8388608);
        cf_opts.set_block_cache_size_mb(1024);
        opts.set_table_cache_num_shard_bits(6);
        cf_opts.set_max_write_buffer_number(32);
        cf_opts.set_write_buffer_size(536870912);
        cf_opts.set_target_file_size_base(1073741824);
        cf_opts.set_min_write_buffer_number_to_merge(4);
        cf_opts.set_level_zero_file_num_compaction_trigger(4);
        cf_opts.set_level_zero_stop_writes_trigger(2000);
        cf_opts.set_level_zero_slowdown_writes_trigger(0);
        cf_opts.set_compaction_style(DBCompactionStyle::Universal);
        opts.set_max_background_jobs(4);
        cf_opts.set_report_bg_io_stats(true);
        opts.set_wal_recovery_mode(DBRecoveryMode::PointInTime);
        opts.enable_statistics(true);
        opts.set_stats_dump_period_sec(60);
        cf_opts.compression_per_level(&per_level_compression);
        blockopts.set_block_size(524288);
        blockopts.set_no_block_cache(true);
        blockopts.set_cache_index_and_filter_blocks(true);
        blockopts.set_bloom_filter(10, false);
        cf_opts.set_block_based_table_factory(blockopts);
        cf_opts.set_disable_auto_compactions(true);
        cf_opts.set_max_compaction_bytes(1073741824 * 25);

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

        DB::open_cf(opts, path, vec![("default", cf_opts)]).unwrap()
    }

    // TODO(tyler) unstable
    // #[bench]
    // fn a_writes(b: &mut Bencher) {
    // dirty hack due to parallel tests causing contention.
    // sleep_ms(1000);
    // let path = "_rust_rocksdb_optimizetest";
    // let mut opts = Options::new();
    // let mut blockopts = BlockBasedOptions::new();
    // let mut db = tuned_for_somebody_elses_disk(path, &mut opts, &mut blockopts);
    // let mut i = 0 as u64;
    // b.iter(|| {
    // db.put(i.to_string().as_bytes(), b"v1111");
    // i += 1;
    // });
    // }
    //
    // #[bench]
    // fn b_reads(b: &mut Bencher) {
    // let path = "_rust_rocksdb_optimizetest";
    // let mut opts = Options::new();
    // let mut blockopts = BlockBasedOptions::new();
    // {
    // let db = tuned_for_somebody_elses_disk(path, &mut opts, &mut blockopts);
    // let mut i = 0 as u64;
    // b.iter(|| {
    // db.get(i.to_string().as_bytes()).on_error( |e| {
    // println!("error: {}", e);
    // e
    // });
    // i += 1;
    // });
    // }
    // DB::destroy(&opts, path).is_ok();
    // }
    //
}