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
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
|
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kSharding
#include "mongo/platform/basic.h"
#include "mongo/s/balancer_configuration.h"
#include <algorithm>
#include <boost/date_time/gregorian/gregorian_types.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/date_time/posix_time/posix_time_types.hpp>
#include "mongo/base/status.h"
#include "mongo/base/status_with.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/util/bson_extract.h"
#include "mongo/db/namespace_string.h"
#include "mongo/s/catalog/sharding_catalog_client.h"
#include "mongo/s/grid.h"
#include "mongo/util/log.h"
#include "mongo/util/str.h"
namespace mongo {
namespace {
// parses time of day in "hh:mm" format assuming 'hh' is 00-23
bool toPointInTime(const std::string& str, boost::posix_time::ptime* timeOfDay) {
int hh = 0;
int mm = 0;
if (2 != sscanf(str.c_str(), "%d:%d", &hh, &mm)) {
return false;
}
// verify that time is well formed
if ((hh / 24) || (mm / 60)) {
return false;
}
boost::posix_time::ptime res(boost::posix_time::second_clock::local_time().date(),
boost::posix_time::hours(hh) + boost::posix_time::minutes(mm));
*timeOfDay = res;
return true;
}
const char kValue[] = "value";
const char kEnabled[] = "enabled";
const char kStopped[] = "stopped";
const char kMode[] = "mode";
const char kActiveWindow[] = "activeWindow";
const char kWaitForDelete[] = "_waitForDelete";
const char kAttemptToBalanceJumboChunks[] = "attemptToBalanceJumboChunks";
} // namespace
const char BalancerSettingsType::kKey[] = "balancer";
const char* BalancerSettingsType::kBalancerModes[] = {"full", "autoSplitOnly", "off"};
const char ChunkSizeSettingsType::kKey[] = "chunksize";
const uint64_t ChunkSizeSettingsType::kDefaultMaxChunkSizeBytes{64 * 1024 * 1024};
const char AutoSplitSettingsType::kKey[] = "autosplit";
BalancerConfiguration::BalancerConfiguration()
: _balancerSettings(BalancerSettingsType::createDefault()),
_maxChunkSizeBytes(ChunkSizeSettingsType::kDefaultMaxChunkSizeBytes),
_shouldAutoSplit(true) {}
BalancerConfiguration::~BalancerConfiguration() = default;
BalancerSettingsType::BalancerMode BalancerConfiguration::getBalancerMode() const {
stdx::lock_guard<Latch> lk(_balancerSettingsMutex);
return _balancerSettings.getMode();
}
Status BalancerConfiguration::setBalancerMode(OperationContext* opCtx,
BalancerSettingsType::BalancerMode mode) {
auto updateStatus = Grid::get(opCtx)->catalogClient()->updateConfigDocument(
opCtx,
NamespaceString::kConfigSettingsNamespace,
BSON("_id" << BalancerSettingsType::kKey),
BSON("$set" << BSON(kStopped << (mode == BalancerSettingsType::kOff) << kMode
<< BalancerSettingsType::kBalancerModes[mode])),
true,
ShardingCatalogClient::kMajorityWriteConcern);
Status refreshStatus = refreshAndCheck(opCtx);
if (!refreshStatus.isOK()) {
return refreshStatus;
}
if (!updateStatus.isOK() && (getBalancerMode() != mode)) {
return updateStatus.getStatus().withContext(str::stream()
<< "Failed to set the balancer mode to "
<< BalancerSettingsType::kBalancerModes[mode]);
}
return Status::OK();
}
Status BalancerConfiguration::enableAutoSplit(OperationContext* opCtx, bool enable) {
auto updateStatus = Grid::get(opCtx)->catalogClient()->updateConfigDocument(
opCtx,
NamespaceString::kConfigSettingsNamespace,
BSON("_id" << AutoSplitSettingsType::kKey),
BSON("$set" << BSON(kEnabled << enable)),
true,
ShardingCatalogClient::kMajorityWriteConcern);
Status refreshStatus = refreshAndCheck(opCtx);
if (!refreshStatus.isOK()) {
return refreshStatus;
}
if (!updateStatus.isOK() && (getShouldAutoSplit() != enable)) {
return updateStatus.getStatus().withContext(
str::stream() << "Failed to " << (enable ? "enable" : "disable") << " auto split");
}
return Status::OK();
}
bool BalancerConfiguration::shouldBalance() const {
stdx::lock_guard<Latch> lk(_balancerSettingsMutex);
if (_balancerSettings.getMode() == BalancerSettingsType::kOff ||
_balancerSettings.getMode() == BalancerSettingsType::kAutoSplitOnly) {
return false;
}
return _balancerSettings.isTimeInBalancingWindow(boost::posix_time::second_clock::local_time());
}
bool BalancerConfiguration::shouldBalanceForAutoSplit() const {
stdx::lock_guard<Latch> lk(_balancerSettingsMutex);
if (_balancerSettings.getMode() == BalancerSettingsType::kOff) {
return false;
}
return _balancerSettings.isTimeInBalancingWindow(boost::posix_time::second_clock::local_time());
}
MigrationSecondaryThrottleOptions BalancerConfiguration::getSecondaryThrottle() const {
stdx::lock_guard<Latch> lk(_balancerSettingsMutex);
return _balancerSettings.getSecondaryThrottle();
}
bool BalancerConfiguration::waitForDelete() const {
stdx::lock_guard<Latch> lk(_balancerSettingsMutex);
return _balancerSettings.waitForDelete();
}
bool BalancerConfiguration::attemptToBalanceJumboChunks() const {
stdx::lock_guard<Latch> lk(_balancerSettingsMutex);
return _balancerSettings.attemptToBalanceJumboChunks();
}
Status BalancerConfiguration::refreshAndCheck(OperationContext* opCtx) {
// Balancer configuration
Status balancerSettingsStatus = _refreshBalancerSettings(opCtx);
if (!balancerSettingsStatus.isOK()) {
return balancerSettingsStatus.withContext("Failed to refresh the balancer settings");
}
// Chunk size settings
Status chunkSizeStatus = _refreshChunkSizeSettings(opCtx);
if (!chunkSizeStatus.isOK()) {
return chunkSizeStatus.withContext("Failed to refresh the chunk sizes settings");
}
// AutoSplit settings
Status autoSplitStatus = _refreshAutoSplitSettings(opCtx);
if (!autoSplitStatus.isOK()) {
return autoSplitStatus.withContext("Failed to refresh the autoSplit settings");
}
return Status::OK();
}
Status BalancerConfiguration::_refreshBalancerSettings(OperationContext* opCtx) {
BalancerSettingsType settings = BalancerSettingsType::createDefault();
auto settingsObjStatus =
Grid::get(opCtx)->catalogClient()->getGlobalSettings(opCtx, BalancerSettingsType::kKey);
if (settingsObjStatus.isOK()) {
auto settingsStatus = BalancerSettingsType::fromBSON(settingsObjStatus.getValue());
if (!settingsStatus.isOK()) {
return settingsStatus.getStatus();
}
settings = std::move(settingsStatus.getValue());
} else if (settingsObjStatus != ErrorCodes::NoMatchingDocument) {
return settingsObjStatus.getStatus();
}
stdx::lock_guard<Latch> lk(_balancerSettingsMutex);
_balancerSettings = std::move(settings);
return Status::OK();
}
Status BalancerConfiguration::_refreshChunkSizeSettings(OperationContext* opCtx) {
ChunkSizeSettingsType settings = ChunkSizeSettingsType::createDefault();
auto settingsObjStatus =
Grid::get(opCtx)->catalogClient()->getGlobalSettings(opCtx, ChunkSizeSettingsType::kKey);
if (settingsObjStatus.isOK()) {
auto settingsStatus = ChunkSizeSettingsType::fromBSON(settingsObjStatus.getValue());
if (!settingsStatus.isOK()) {
return settingsStatus.getStatus();
}
settings = std::move(settingsStatus.getValue());
} else if (settingsObjStatus != ErrorCodes::NoMatchingDocument) {
return settingsObjStatus.getStatus();
}
if (settings.getMaxChunkSizeBytes() != getMaxChunkSizeBytes()) {
log() << "MaxChunkSize changing from " << getMaxChunkSizeBytes() / (1024 * 1024) << "MB"
<< " to " << settings.getMaxChunkSizeBytes() / (1024 * 1024) << "MB";
_maxChunkSizeBytes.store(settings.getMaxChunkSizeBytes());
}
return Status::OK();
}
Status BalancerConfiguration::_refreshAutoSplitSettings(OperationContext* opCtx) {
AutoSplitSettingsType settings = AutoSplitSettingsType::createDefault();
auto settingsObjStatus =
Grid::get(opCtx)->catalogClient()->getGlobalSettings(opCtx, AutoSplitSettingsType::kKey);
if (settingsObjStatus.isOK()) {
auto settingsStatus = AutoSplitSettingsType::fromBSON(settingsObjStatus.getValue());
if (!settingsStatus.isOK()) {
return settingsStatus.getStatus();
}
settings = std::move(settingsStatus.getValue());
} else if (settingsObjStatus != ErrorCodes::NoMatchingDocument) {
return settingsObjStatus.getStatus();
}
if (settings.getShouldAutoSplit() != getShouldAutoSplit()) {
log() << "ShouldAutoSplit changing from " << getShouldAutoSplit() << " to "
<< settings.getShouldAutoSplit();
_shouldAutoSplit.store(settings.getShouldAutoSplit());
}
return Status::OK();
}
BalancerSettingsType::BalancerSettingsType()
: _secondaryThrottle(
MigrationSecondaryThrottleOptions::create(MigrationSecondaryThrottleOptions::kDefault)) {}
BalancerSettingsType BalancerSettingsType::createDefault() {
return BalancerSettingsType();
}
StatusWith<BalancerSettingsType> BalancerSettingsType::fromBSON(const BSONObj& obj) {
BalancerSettingsType settings;
{
bool stopped;
Status status = bsonExtractBooleanFieldWithDefault(obj, kStopped, false, &stopped);
if (!status.isOK())
return status;
if (stopped) {
settings._mode = kOff;
} else {
std::string modeStr;
status = bsonExtractStringFieldWithDefault(obj, kMode, kBalancerModes[kFull], &modeStr);
if (!status.isOK())
return status;
auto it = std::find(std::begin(kBalancerModes), std::end(kBalancerModes), modeStr);
if (it == std::end(kBalancerModes)) {
return Status(ErrorCodes::BadValue, "Invalid balancer mode");
}
settings._mode = static_cast<BalancerMode>(it - std::begin(kBalancerModes));
}
}
{
BSONElement activeWindowElem;
Status status = bsonExtractTypedField(obj, kActiveWindow, Object, &activeWindowElem);
if (status.isOK()) {
const BSONObj balancingWindowObj = activeWindowElem.Obj();
if (balancingWindowObj.isEmpty()) {
return Status(ErrorCodes::BadValue, "activeWindow not specified");
}
// Check if both 'start' and 'stop' are present
const std::string start = balancingWindowObj.getField("start").str();
const std::string stop = balancingWindowObj.getField("stop").str();
if (start.empty() || stop.empty()) {
return Status(ErrorCodes::BadValue,
str::stream()
<< "must specify both start and stop of balancing window: "
<< balancingWindowObj);
}
// Check that both 'start' and 'stop' are valid time-of-day
boost::posix_time::ptime startTime;
boost::posix_time::ptime stopTime;
if (!toPointInTime(start, &startTime) || !toPointInTime(stop, &stopTime)) {
return Status(ErrorCodes::BadValue,
str::stream() << kActiveWindow << " format is "
<< " { start: \"hh:mm\" , stop: \"hh:mm\" }");
}
// Check that start and stop designate different time points
if (startTime == stopTime) {
return Status(ErrorCodes::BadValue,
str::stream() << "start and stop times must be different");
}
settings._activeWindowStart = startTime;
settings._activeWindowStop = stopTime;
} else if (status != ErrorCodes::NoSuchKey) {
return status;
}
}
{
auto secondaryThrottleStatus =
MigrationSecondaryThrottleOptions::createFromBalancerConfig(obj);
if (!secondaryThrottleStatus.isOK()) {
return secondaryThrottleStatus.getStatus();
}
settings._secondaryThrottle = std::move(secondaryThrottleStatus.getValue());
}
{
bool waitForDelete;
Status status =
bsonExtractBooleanFieldWithDefault(obj, kWaitForDelete, false, &waitForDelete);
if (!status.isOK())
return status;
settings._waitForDelete = waitForDelete;
}
{
bool attemptToBalanceJumboChunks;
Status status = bsonExtractBooleanFieldWithDefault(
obj, kAttemptToBalanceJumboChunks, false, &attemptToBalanceJumboChunks);
if (!status.isOK())
return status;
settings._attemptToBalanceJumboChunks = attemptToBalanceJumboChunks;
}
return settings;
}
bool BalancerSettingsType::isTimeInBalancingWindow(const boost::posix_time::ptime& now) const {
invariant(!_activeWindowStart == !_activeWindowStop);
if (!_activeWindowStart) {
return true;
}
LOG(1).stream() << "inBalancingWindow: "
<< " now: " << now << " startTime: " << *_activeWindowStart
<< " stopTime: " << *_activeWindowStop;
if (*_activeWindowStop > *_activeWindowStart) {
if ((now >= *_activeWindowStart) && (now <= *_activeWindowStop)) {
return true;
}
} else if (*_activeWindowStart > *_activeWindowStop) {
if ((now >= *_activeWindowStart) || (now <= *_activeWindowStop)) {
return true;
}
} else {
MONGO_UNREACHABLE;
}
return false;
}
ChunkSizeSettingsType::ChunkSizeSettingsType() = default;
ChunkSizeSettingsType ChunkSizeSettingsType::createDefault() {
return ChunkSizeSettingsType();
}
StatusWith<ChunkSizeSettingsType> ChunkSizeSettingsType::fromBSON(const BSONObj& obj) {
long long maxChunkSizeMB;
Status status = bsonExtractIntegerField(obj, kValue, &maxChunkSizeMB);
if (!status.isOK())
return status;
const uint64_t maxChunkSizeBytes = maxChunkSizeMB * 1024 * 1024;
if (!checkMaxChunkSizeValid(maxChunkSizeBytes)) {
return {ErrorCodes::BadValue,
str::stream() << maxChunkSizeMB << " is not a valid value for " << kKey};
}
ChunkSizeSettingsType settings;
settings._maxChunkSizeBytes = maxChunkSizeBytes;
return settings;
}
bool ChunkSizeSettingsType::checkMaxChunkSizeValid(uint64_t maxChunkSizeBytes) {
if (maxChunkSizeBytes >= (1024 * 1024) && maxChunkSizeBytes <= (1024 * 1024 * 1024)) {
return true;
}
return false;
}
AutoSplitSettingsType::AutoSplitSettingsType() = default;
AutoSplitSettingsType AutoSplitSettingsType::createDefault() {
return AutoSplitSettingsType();
}
StatusWith<AutoSplitSettingsType> AutoSplitSettingsType::fromBSON(const BSONObj& obj) {
bool shouldAutoSplit;
Status status = bsonExtractBooleanField(obj, kEnabled, &shouldAutoSplit);
if (!status.isOK())
return status;
AutoSplitSettingsType settings;
settings._shouldAutoSplit = shouldAutoSplit;
return settings;
}
} // namespace mongo
|