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
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
/*
Copyright (c) 2016, Facebook, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA */
#pragma once
/* MySQL header files */
#include "../sql/log.h"
#include "./handler.h" /* handler */
#include "./my_global.h" /* ulonglong */
/* C++ standard header files */
#include <queue>
#include <set>
#include <vector>
/* RocksDB header files */
#include "rocksdb/db.h"
/* MyRocks header files */
#include "./rdb_comparator.h"
namespace myrocks {
/*
Length of delimiters used during inplace index creation.
*/
#define RDB_MERGE_CHUNK_LEN sizeof(size_t)
#define RDB_MERGE_REC_DELIMITER sizeof(size_t)
#define RDB_MERGE_KEY_DELIMITER RDB_MERGE_REC_DELIMITER
#define RDB_MERGE_VAL_DELIMITER RDB_MERGE_REC_DELIMITER
class Rdb_key_def;
class Rdb_tbl_def;
class Rdb_index_merge {
Rdb_index_merge(const Rdb_index_merge &p) = delete;
Rdb_index_merge &operator=(const Rdb_index_merge &p) = delete;
public:
/* Information about temporary files used in external merge sort */
struct merge_file_info {
File m_fd = -1; /* file descriptor */
ulong m_num_sort_buffers = 0; /* number of sort buffers in temp file */
};
/* Buffer for sorting in main memory. */
struct merge_buf_info {
/* heap memory allocated for main memory sort/merge */
std::unique_ptr<uchar[]> m_block;
const ulonglong
m_block_len; /* amount of data bytes allocated for block above */
ulonglong m_curr_offset; /* offset of the record pointer for the block */
ulonglong m_disk_start_offset; /* where the chunk starts on disk */
ulonglong m_disk_curr_offset; /* current offset on disk */
ulonglong m_total_size; /* total # of data bytes in chunk */
void store_key_value(const rocksdb::Slice &key, const rocksdb::Slice &val)
MY_ATTRIBUTE((__nonnull__));
void store_slice(const rocksdb::Slice &slice) MY_ATTRIBUTE((__nonnull__));
size_t prepare(File fd, ulonglong f_offset) MY_ATTRIBUTE((__nonnull__));
int read_next_chunk_from_disk(File fd)
MY_ATTRIBUTE((__nonnull__, __warn_unused_result__));
inline bool is_chunk_finished() const {
return m_curr_offset + m_disk_curr_offset - m_disk_start_offset ==
m_total_size;
}
inline bool has_space(uint64 needed) const {
return m_curr_offset + needed <= m_block_len;
}
explicit merge_buf_info(const ulonglong merge_block_size)
: m_block(nullptr),
m_block_len(merge_block_size),
m_curr_offset(0),
m_disk_start_offset(0),
m_disk_curr_offset(0),
m_total_size(merge_block_size) {
/* Will throw an exception if it runs out of memory here */
m_block = std::unique_ptr<uchar[]>(new uchar[merge_block_size]);
/* Initialize entire buffer to 0 to avoid valgrind errors */
memset(m_block.get(), 0, merge_block_size);
}
};
/* Represents an entry in the heap during merge phase of external sort */
struct merge_heap_entry {
std::shared_ptr<merge_buf_info> m_chunk_info; /* pointer to buffer info */
uchar *m_block; /* pointer to heap memory where record is stored */
const rocksdb::Comparator *const m_comparator;
rocksdb::Slice m_key; /* current key pointed to by block ptr */
rocksdb::Slice m_val;
size_t prepare(File fd, ulonglong f_offset, ulonglong chunk_size)
MY_ATTRIBUTE((__nonnull__));
int read_next_chunk_from_disk(File fd)
MY_ATTRIBUTE((__nonnull__, __warn_unused_result__));
int read_rec(rocksdb::Slice *const key, rocksdb::Slice *const val)
MY_ATTRIBUTE((__nonnull__, __warn_unused_result__));
int read_slice(rocksdb::Slice *const slice, const uchar **block_ptr)
MY_ATTRIBUTE((__nonnull__, __warn_unused_result__));
explicit merge_heap_entry(const rocksdb::Comparator *const comparator)
: m_chunk_info(nullptr), m_block(nullptr), m_comparator(comparator) {}
};
struct merge_heap_comparator {
bool operator()(const std::shared_ptr<merge_heap_entry> &lhs,
const std::shared_ptr<merge_heap_entry> &rhs) {
return lhs->m_comparator->Compare(rhs->m_key, lhs->m_key) < 0;
}
};
/* Represents a record in unsorted buffer */
struct merge_record {
uchar *m_block; /* points to offset of key in sort buffer */
const rocksdb::Comparator *const m_comparator;
bool operator<(const merge_record &record) const {
return merge_record_compare(this->m_block, record.m_block, m_comparator) <
0;
}
merge_record(uchar *const block,
const rocksdb::Comparator *const comparator)
: m_block(block), m_comparator(comparator) {}
};
private:
const char *m_tmpfile_path;
const ulonglong m_merge_buf_size;
const ulonglong m_merge_combine_read_size;
const ulonglong m_merge_tmp_file_removal_delay;
rocksdb::ColumnFamilyHandle *m_cf_handle;
struct merge_file_info m_merge_file;
std::shared_ptr<merge_buf_info> m_rec_buf_unsorted;
std::shared_ptr<merge_buf_info> m_output_buf;
std::set<merge_record> m_offset_tree;
std::priority_queue<std::shared_ptr<merge_heap_entry>,
std::vector<std::shared_ptr<merge_heap_entry>>,
merge_heap_comparator>
m_merge_min_heap;
static inline void merge_store_uint64(uchar *const dst, uint64 n) {
memcpy(dst, &n, sizeof(n));
}
static inline void merge_read_uint64(const uchar **buf_ptr,
uint64 *const dst) {
DBUG_ASSERT(buf_ptr != nullptr);
memcpy(dst, *buf_ptr, sizeof(uint64));
*buf_ptr += sizeof(uint64);
}
static inline rocksdb::Slice as_slice(const uchar *block) {
uint64 len;
merge_read_uint64(&block, &len);
return rocksdb::Slice(reinterpret_cast<const char *>(block), len);
}
static int merge_record_compare(const uchar *a_block, const uchar *b_block,
const rocksdb::Comparator *const comparator)
MY_ATTRIBUTE((__nonnull__, __warn_unused_result__));
void merge_read_rec(const uchar *const block, rocksdb::Slice *const key,
rocksdb::Slice *const val) MY_ATTRIBUTE((__nonnull__));
void read_slice(rocksdb::Slice *slice, const uchar *block_ptr)
MY_ATTRIBUTE((__nonnull__));
public:
Rdb_index_merge(const char *const tmpfile_path,
const ulonglong merge_buf_size,
const ulonglong merge_combine_read_size,
const ulonglong merge_tmp_file_removal_delay,
rocksdb::ColumnFamilyHandle *cf);
~Rdb_index_merge();
int init() MY_ATTRIBUTE((__nonnull__, __warn_unused_result__));
int merge_file_create() MY_ATTRIBUTE((__nonnull__, __warn_unused_result__));
int add(const rocksdb::Slice &key, const rocksdb::Slice &val)
MY_ATTRIBUTE((__nonnull__, __warn_unused_result__));
int merge_buf_write() MY_ATTRIBUTE((__nonnull__, __warn_unused_result__));
int next(rocksdb::Slice *const key, rocksdb::Slice *const val)
MY_ATTRIBUTE((__nonnull__, __warn_unused_result__));
int merge_heap_prepare() MY_ATTRIBUTE((__nonnull__, __warn_unused_result__));
void merge_heap_top(rocksdb::Slice *key, rocksdb::Slice *val)
MY_ATTRIBUTE((__nonnull__));
int merge_heap_pop_and_get_next(rocksdb::Slice *const key,
rocksdb::Slice *const val)
MY_ATTRIBUTE((__nonnull__, __warn_unused_result__));
void merge_reset();
rocksdb::ColumnFamilyHandle *get_cf() const { return m_cf_handle; }
};
} // namespace myrocks
|
