dharmadb 0.1.1

Persistent, fault tolerant key-value store written in Rust.
Documentation 
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

use crate::common::test_key::TestKey;
use crate::common::test_value::TestValue;
use crate::common::{cleanup_paths, get_test_data, get_test_data_in_range};
use dharmadb::options::DharmaOpts;
use dharmadb::storage::block::Value;
use dharmadb::storage::compaction::basic::{BasicCompaction, BasicCompactionOpts};
use dharmadb::storage::sorted_string_table_reader::SSTableReader;
use dharmadb::storage::sorted_string_table_writer::write_sstable;
use dharmadb::traits::Nil;

mod common;

#[test]
fn test_basic_compaction_with_tables_of_same_size() {
    let options = DharmaOpts::default();
    cleanup_paths(&options);
    let mut data_1 = get_test_data(500);
    let mut data_2 = get_test_data(500);
    let data_1_write_result = write_sstable(&options, &data_1, 0);
    let data_2_write_result = write_sstable(&options, &data_2, 1);
    assert!(data_1_write_result.is_ok());
    assert!(data_2_write_result.is_ok());

    let mut compaction_opts = BasicCompactionOpts::from(options.clone());
    // override compaction path to 2
    compaction_opts.threshold = 2;
    let compaction = BasicCompaction::new(compaction_opts);

    let compaction_result = compaction.compact::<TestKey, TestValue>();
    assert!(compaction_result.is_ok());
    let maybe_compaction_path = compaction_result.unwrap();
    assert!(maybe_compaction_path.is_some());
    let compaction_path = maybe_compaction_path.unwrap();
    // test data is sorted
    let reader_result = SSTableReader::from(&compaction_path, options.block_size_in_bytes);
    assert!(reader_result.is_ok());
    let mut reader = reader_result.unwrap();
    let mut output = Vec::new();
    while reader.has_next() {
        let value = reader.read();
        let record: Value<TestKey, TestValue> = value.to_record().unwrap();
        output.push((record.key, record.value));
        reader.next();
    }
    assert_eq!(output.len(), 500);
    data_1.append(&mut data_2);
    data_1.sort_by_key(|val| val.0.clone());
    data_1.dedup();
    assert_eq!(data_1, output);
}

#[test]
fn test_basic_compaction_with_tables_of_different_size() {
    let mut data_1 = get_test_data(200);
    let mut data_2 = get_test_data_in_range(200, 700);
    let options = DharmaOpts::default();
    cleanup_paths(&options);
    let data_1_write_result = write_sstable(&options, &data_1, 0);
    let data_2_write_result = write_sstable(&options, &data_2, 1);
    assert!(data_1_write_result.is_ok());
    assert!(data_2_write_result.is_ok());

    let mut compaction_opts = BasicCompactionOpts::from(options.clone());
    // override compaction path to 2
    compaction_opts.threshold = 2;
    let compaction = BasicCompaction::new(compaction_opts);

    let compaction_result = compaction.compact::<TestKey, TestValue>();
    assert!(compaction_result.is_ok());
    let maybe_compaction_path = compaction_result.unwrap();
    assert!(maybe_compaction_path.is_some());
    let compaction_path = maybe_compaction_path.unwrap();
    // test data is sorted
    let reader_result = SSTableReader::from(&compaction_path, options.block_size_in_bytes);
    assert!(reader_result.is_ok());
    let mut reader = reader_result.unwrap();
    let mut output = Vec::new();
    while reader.has_next() {
        let value = reader.read();
        let record: Value<TestKey, TestValue> = value.to_record().unwrap();
        output.push((record.key, record.value));
        reader.next();
    }
    assert_eq!(output.len(), 700);
    data_1.append(&mut data_2);
    data_1.sort_by_key(|val| val.0.clone());
    data_1.dedup();
    assert_eq!(data_1, output);
}

#[test]
fn test_basic_compaction_with_intersecting_values() {
    let mut data_1 = get_test_data_in_range(0, 200);
    let mut data_2 = get_test_data_in_range(80, 220);
    let options = DharmaOpts::default();
    cleanup_paths(&options);
    let data_1_write_result = write_sstable(&options, &data_1, 0);
    let data_2_write_result = write_sstable(&options, &data_2, 1);
    assert!(data_1_write_result.is_ok());
    assert!(data_2_write_result.is_ok());

    let mut compaction_opts = BasicCompactionOpts::from(options.clone());
    // override compaction path to 2
    compaction_opts.threshold = 2;
    let compaction = BasicCompaction::new(compaction_opts);
    let compaction_result = compaction.compact::<TestKey, TestValue>();
    assert!(compaction_result.is_ok());
    let maybe_compaction_path = compaction_result.unwrap();
    assert!(maybe_compaction_path.is_some());
    let compaction_path = maybe_compaction_path.unwrap();
    // test data is sorted
    let reader_result = SSTableReader::from(&compaction_path, options.block_size_in_bytes);
    assert!(reader_result.is_ok());
    let mut reader = reader_result.unwrap();
    let mut output = Vec::new();
    while reader.has_next() {
        let value = reader.read();
        let record: Value<TestKey, TestValue> = value.to_record().unwrap();
        output.push((record.key, record.value));
        reader.next();
    }
    assert_eq!(output.len(), 220);
    data_1.append(&mut data_2);
    data_1.sort_by_key(|val| val.0.clone());
    data_1.dedup();
    assert_eq!(data_1, output);
}

#[test]
fn test_basic_compaction_ignores_delete_markers() {
    let mut data_1 = get_test_data_in_range(0, 200);
    let mut data_2 = Vec::new();
    // create delete markers for values in range(0-50)
    for i in 0..50 {
        data_2.push((TestKey::from(i), TestValue::nil()));
    }
    let options = DharmaOpts::default();
    cleanup_paths(&options);
    let data_1_write_result = write_sstable(&options, &data_1, 0);
    let data_2_write_result = write_sstable(&options, &data_2, 1);
    assert!(data_1_write_result.is_ok());
    assert!(data_2_write_result.is_ok());

    let mut compaction_opts = BasicCompactionOpts::from(options.clone());
    // override compaction path to 2
    compaction_opts.threshold = 2;
    let compaction = BasicCompaction::new(compaction_opts);
    let compaction_result = compaction.compact::<TestKey, TestValue>();
    assert!(compaction_result.is_ok());
    let maybe_compaction_path = compaction_result.unwrap();
    assert!(maybe_compaction_path.is_some());
    let compaction_path = maybe_compaction_path.unwrap();
    // test data is sorted
    let reader_result = SSTableReader::from(&compaction_path, options.block_size_in_bytes);
    assert!(reader_result.is_ok());
    let mut reader = reader_result.unwrap();
    let mut output = Vec::new();
    while reader.has_next() {
        let value = reader.read();
        let record: Value<TestKey, TestValue> = value.to_record().unwrap();
        output.push((record.key, record.value));
        reader.next();
    }
    assert_eq!(output.len(), 150);
    // contains values from 50..200
    let mut i = 50;
    for (key, _) in output {
        assert_eq!(key, TestKey::from(i));
        i += 1;
    }
}