/
ClusterCopier.cpp
2247 lines (1782 loc) · 84.5 KB
/
ClusterCopier.cpp
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
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#include "ClusterCopier.h"
#include <chrono>
#include <Poco/Util/XMLConfiguration.h>
#include <Poco/Logger.h>
#include <Poco/ConsoleChannel.h>
#include <Poco/FormattingChannel.h>
#include <Poco/PatternFormatter.h>
#include <Poco/UUIDGenerator.h>
#include <Poco/File.h>
#include <Poco/Process.h>
#include <Poco/FileChannel.h>
#include <Poco/SplitterChannel.h>
#include <Poco/Util/HelpFormatter.h>
#include <boost/algorithm/string.hpp>
#include <pcg_random.hpp>
#include <common/logger_useful.h>
#include <Common/ThreadPool.h>
#include <Common/Exception.h>
#include <Common/ZooKeeper/ZooKeeper.h>
#include <Common/ZooKeeper/KeeperException.h>
#include <Common/getFQDNOrHostName.h>
#include <Common/isLocalAddress.h>
#include <Common/typeid_cast.h>
#include <Common/ClickHouseRevision.h>
#include <Common/formatReadable.h>
#include <Common/DNSResolver.h>
#include <Common/CurrentThread.h>
#include <Common/escapeForFileName.h>
#include <Common/getNumberOfPhysicalCPUCores.h>
#include <Common/ThreadStatus.h>
#include <Client/Connection.h>
#include <Interpreters/Context.h>
#include <Interpreters/Cluster.h>
#include <Interpreters/InterpreterFactory.h>
#include <Interpreters/InterpreterExistsQuery.h>
#include <Interpreters/InterpreterShowCreateQuery.h>
#include <Interpreters/InterpreterDropQuery.h>
#include <Interpreters/InterpreterCreateQuery.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnsNumber.h>
#include <DataTypes/DataTypeString.h>
#include <Parsers/ParserCreateQuery.h>
#include <Parsers/parseQuery.h>
#include <Parsers/ParserQuery.h>
#include <Parsers/ASTCreateQuery.h>
#include <Parsers/queryToString.h>
#include <Parsers/ASTDropQuery.h>
#include <Parsers/ASTLiteral.h>
#include <Parsers/ASTExpressionList.h>
#include <Formats/FormatSettings.h>
#include <DataStreams/RemoteBlockInputStream.h>
#include <DataStreams/SquashingBlockInputStream.h>
#include <DataStreams/AsynchronousBlockInputStream.h>
#include <DataStreams/copyData.h>
#include <DataStreams/NullBlockOutputStream.h>
#include <IO/ConnectionTimeouts.h>
#include <IO/Operators.h>
#include <IO/ReadBufferFromString.h>
#include <IO/ReadBufferFromFile.h>
#include <Functions/registerFunctions.h>
#include <TableFunctions/registerTableFunctions.h>
#include <AggregateFunctions/registerAggregateFunctions.h>
#include <Storages/registerStorages.h>
#include <Storages/StorageDistributed.h>
#include <Dictionaries/registerDictionaries.h>
#include <Databases/DatabaseMemory.h>
#include <Common/StatusFile.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NO_ZOOKEEPER;
extern const int BAD_ARGUMENTS;
extern const int UNKNOWN_TABLE;
extern const int UNFINISHED;
extern const int UNKNOWN_ELEMENT_IN_CONFIG;
}
using ConfigurationPtr = Poco::AutoPtr<Poco::Util::AbstractConfiguration>;
static ConfigurationPtr getConfigurationFromXMLString(const std::string & xml_data)
{
std::stringstream ss(xml_data);
Poco::XML::InputSource input_source{ss};
return {new Poco::Util::XMLConfiguration{&input_source}};
}
namespace
{
using DatabaseAndTableName = std::pair<String, String>;
String getQuotedTable(const String & database, const String & table)
{
if (database.empty())
{
return backQuoteIfNeed(table);
}
return backQuoteIfNeed(database) + "." + backQuoteIfNeed(table);
}
String getQuotedTable(const DatabaseAndTableName & db_and_table)
{
return getQuotedTable(db_and_table.first, db_and_table.second);
}
enum class TaskState
{
Started = 0,
Finished,
Unknown
};
/// Used to mark status of shard partition tasks
struct TaskStateWithOwner
{
TaskStateWithOwner() = default;
TaskStateWithOwner(TaskState state_, const String & owner_) : state(state_), owner(owner_) {}
TaskState state{TaskState::Unknown};
String owner;
static String getData(TaskState state, const String & owner)
{
return TaskStateWithOwner(state, owner).toString();
}
String toString()
{
WriteBufferFromOwnString wb;
wb << static_cast<UInt32>(state) << "\n" << escape << owner;
return wb.str();
}
static TaskStateWithOwner fromString(const String & data)
{
ReadBufferFromString rb(data);
TaskStateWithOwner res;
UInt32 state;
rb >> state >> "\n" >> escape >> res.owner;
if (state >= static_cast<int>(TaskState::Unknown))
throw Exception("Unknown state " + data, ErrorCodes::LOGICAL_ERROR);
res.state = static_cast<TaskState>(state);
return res;
}
};
/// Hierarchical description of the tasks
struct ShardPartition;
struct TaskShard;
struct TaskTable;
struct TaskCluster;
struct ClusterPartition;
using TasksPartition = std::map<String, ShardPartition, std::greater<>>;
using ShardInfo = Cluster::ShardInfo;
using TaskShardPtr = std::shared_ptr<TaskShard>;
using TasksShard = std::vector<TaskShardPtr>;
using TasksTable = std::list<TaskTable>;
using ClusterPartitions = std::map<String, ClusterPartition, std::greater<>>;
/// Just destination partition of a shard
struct ShardPartition
{
ShardPartition(TaskShard & parent, const String & name_quoted_) : task_shard(parent), name(name_quoted_) {}
String getPartitionPath() const;
String getCommonPartitionIsDirtyPath() const;
String getPartitionActiveWorkersPath() const;
String getActiveWorkerPath() const;
String getPartitionShardsPath() const;
String getShardStatusPath() const;
TaskShard & task_shard;
String name;
};
struct ShardPriority
{
UInt8 is_remote = 1;
size_t hostname_difference = 0;
UInt8 random = 0;
static bool greaterPriority(const ShardPriority & current, const ShardPriority & other)
{
return std::forward_as_tuple(current.is_remote, current.hostname_difference, current.random)
< std::forward_as_tuple(other.is_remote, other.hostname_difference, other.random);
}
};
struct TaskShard
{
TaskShard(TaskTable & parent, const ShardInfo & info_) : task_table(parent), info(info_) {}
TaskTable & task_table;
ShardInfo info;
UInt32 numberInCluster() const { return info.shard_num; }
UInt32 indexInCluster() const { return info.shard_num - 1; }
String getDescription() const;
String getHostNameExample() const;
/// Used to sort clusters by their proximity
ShardPriority priority;
/// Column with unique destination partitions (computed from engine_push_partition_key expr.) in the shard
ColumnWithTypeAndName partition_key_column;
/// There is a task for each destination partition
TasksPartition partition_tasks;
/// Which partitions have been checked for existence
/// If some partition from this lists is exists, it is in partition_tasks
std::set<String> checked_partitions;
/// Last CREATE TABLE query of the table of the shard
ASTPtr current_pull_table_create_query;
/// Internal distributed tables
DatabaseAndTableName table_read_shard;
DatabaseAndTableName table_split_shard;
};
/// Contains info about all shards that contain a partition
struct ClusterPartition
{
double elapsed_time_seconds = 0;
UInt64 bytes_copied = 0;
UInt64 rows_copied = 0;
UInt64 blocks_copied = 0;
UInt64 total_tries = 0;
};
struct TaskTable
{
TaskTable(TaskCluster & parent, const Poco::Util::AbstractConfiguration & config, const String & prefix,
const String & table_key);
TaskCluster & task_cluster;
String getPartitionPath(const String & partition_name) const;
String getPartitionIsDirtyPath(const String & partition_name) const;
String name_in_config;
/// Used as task ID
String table_id;
/// Source cluster and table
String cluster_pull_name;
DatabaseAndTableName table_pull;
/// Destination cluster and table
String cluster_push_name;
DatabaseAndTableName table_push;
/// Storage of destination table
String engine_push_str;
ASTPtr engine_push_ast;
ASTPtr engine_push_partition_key_ast;
/// A Distributed table definition used to split data
String sharding_key_str;
ASTPtr sharding_key_ast;
ASTPtr engine_split_ast;
/// Additional WHERE expression to filter input data
String where_condition_str;
ASTPtr where_condition_ast;
/// Resolved clusters
ClusterPtr cluster_pull;
ClusterPtr cluster_push;
/// Filter partitions that should be copied
bool has_enabled_partitions = false;
Strings enabled_partitions;
NameSet enabled_partitions_set;
/// Prioritized list of shards
TasksShard all_shards;
TasksShard local_shards;
ClusterPartitions cluster_partitions;
NameSet finished_cluster_partitions;
/// Parition names to process in user-specified order
Strings ordered_partition_names;
ClusterPartition & getClusterPartition(const String & partition_name)
{
auto it = cluster_partitions.find(partition_name);
if (it == cluster_partitions.end())
throw Exception("There are no cluster partition " + partition_name + " in " + table_id, ErrorCodes::LOGICAL_ERROR);
return it->second;
}
Stopwatch watch;
UInt64 bytes_copied = 0;
UInt64 rows_copied = 0;
template <typename RandomEngine>
void initShards(RandomEngine && random_engine);
};
struct TaskCluster
{
TaskCluster(const String & task_zookeeper_path_, const String & default_local_database_)
: task_zookeeper_path(task_zookeeper_path_), default_local_database(default_local_database_) {}
void loadTasks(const Poco::Util::AbstractConfiguration & config, const String & base_key = "");
/// Set (or update) settings and max_workers param
void reloadSettings(const Poco::Util::AbstractConfiguration & config, const String & base_key = "");
/// Base node for all tasks. Its structure:
/// workers/ - directory with active workers (amount of them is less or equal max_workers)
/// description - node with task configuration
/// table_table1/ - directories with per-partition copying status
String task_zookeeper_path;
/// Database used to create temporary Distributed tables
String default_local_database;
/// Limits number of simultaneous workers
UInt64 max_workers = 0;
/// Base settings for pull and push
Settings settings_common;
/// Settings used to fetch data
Settings settings_pull;
/// Settings used to insert data
Settings settings_push;
String clusters_prefix;
/// Subtasks
TasksTable table_tasks;
std::random_device random_device;
pcg64 random_engine;
};
struct MultiTransactionInfo
{
int32_t code;
Coordination::Requests requests;
Coordination::Responses responses;
};
/// Atomically checks that is_dirty node is not exists, and made the remaining op
/// Returns relative number of failed operation in the second field (the passed op has 0 index)
static MultiTransactionInfo checkNoNodeAndCommit(
const zkutil::ZooKeeperPtr & zookeeper,
const String & checking_node_path,
Coordination::RequestPtr && op)
{
MultiTransactionInfo info;
info.requests.emplace_back(zkutil::makeCreateRequest(checking_node_path, "", zkutil::CreateMode::Persistent));
info.requests.emplace_back(zkutil::makeRemoveRequest(checking_node_path, -1));
info.requests.emplace_back(std::move(op));
info.code = zookeeper->tryMulti(info.requests, info.responses);
return info;
}
// Creates AST representing 'ENGINE = Distributed(cluster, db, table, [sharding_key])
std::shared_ptr<ASTStorage> createASTStorageDistributed(
const String & cluster_name, const String & database, const String & table, const ASTPtr & sharding_key_ast = nullptr)
{
auto args = std::make_shared<ASTExpressionList>();
args->children.emplace_back(std::make_shared<ASTLiteral>(cluster_name));
args->children.emplace_back(std::make_shared<ASTIdentifier>(database));
args->children.emplace_back(std::make_shared<ASTIdentifier>(table));
if (sharding_key_ast)
args->children.emplace_back(sharding_key_ast);
auto engine = std::make_shared<ASTFunction>();
engine->name = "Distributed";
engine->arguments = args;
auto storage = std::make_shared<ASTStorage>();
storage->set(storage->engine, engine);
return storage;
}
BlockInputStreamPtr squashStreamIntoOneBlock(const BlockInputStreamPtr & stream)
{
return std::make_shared<SquashingBlockInputStream>(
stream,
std::numeric_limits<size_t>::max(),
std::numeric_limits<size_t>::max());
}
Block getBlockWithAllStreamData(const BlockInputStreamPtr & stream)
{
return squashStreamIntoOneBlock(stream)->read();
}
/// Path getters
String TaskTable::getPartitionPath(const String & partition_name) const
{
return task_cluster.task_zookeeper_path // root
+ "/tables/" + table_id // tables/dst_cluster.merge.hits
+ "/" + escapeForFileName(partition_name); // 201701
}
String ShardPartition::getPartitionPath() const
{
return task_shard.task_table.getPartitionPath(name);
}
String ShardPartition::getShardStatusPath() const
{
// /root/table_test.hits/201701/1
return getPartitionPath() + "/shards/" + toString(task_shard.numberInCluster());
}
String ShardPartition::getPartitionShardsPath() const
{
return getPartitionPath() + "/shards";
}
String ShardPartition::getPartitionActiveWorkersPath() const
{
return getPartitionPath() + "/partition_active_workers";
}
String ShardPartition::getActiveWorkerPath() const
{
return getPartitionActiveWorkersPath() + "/" + toString(task_shard.numberInCluster());
}
String ShardPartition::getCommonPartitionIsDirtyPath() const
{
return getPartitionPath() + "/is_dirty";
}
String TaskTable::getPartitionIsDirtyPath(const String & partition_name) const
{
return getPartitionPath(partition_name) + "/is_dirty";
}
String DB::TaskShard::getDescription() const
{
std::stringstream ss;
ss << "N" << numberInCluster()
<< " (having a replica " << getHostNameExample()
<< ", pull table " + getQuotedTable(task_table.table_pull)
<< " of cluster " + task_table.cluster_pull_name << ")";
return ss.str();
}
String DB::TaskShard::getHostNameExample() const
{
auto & replicas = task_table.cluster_pull->getShardsAddresses().at(indexInCluster());
return replicas.at(0).readableString();
}
static bool isExtendedDefinitionStorage(const ASTPtr & storage_ast)
{
const auto & storage = storage_ast->as<ASTStorage &>();
return storage.partition_by || storage.order_by || storage.sample_by;
}
static ASTPtr extractPartitionKey(const ASTPtr & storage_ast)
{
String storage_str = queryToString(storage_ast);
const auto & storage = storage_ast->as<ASTStorage &>();
const auto & engine = storage.engine->as<ASTFunction &>();
if (!endsWith(engine.name, "MergeTree"))
{
throw Exception("Unsupported engine was specified in " + storage_str + ", only *MergeTree engines are supported",
ErrorCodes::BAD_ARGUMENTS);
}
if (isExtendedDefinitionStorage(storage_ast))
{
if (storage.partition_by)
return storage.partition_by->clone();
static const char * all = "all";
return std::make_shared<ASTLiteral>(Field(all, strlen(all)));
}
else
{
bool is_replicated = startsWith(engine.name, "Replicated");
size_t min_args = is_replicated ? 3 : 1;
if (!engine.arguments)
throw Exception("Expected arguments in " + storage_str, ErrorCodes::BAD_ARGUMENTS);
ASTPtr arguments_ast = engine.arguments->clone();
ASTs & arguments = arguments_ast->children;
if (arguments.size() < min_args)
throw Exception("Expected at least " + toString(min_args) + " arguments in " + storage_str, ErrorCodes::BAD_ARGUMENTS);
ASTPtr & month_arg = is_replicated ? arguments[2] : arguments[1];
return makeASTFunction("toYYYYMM", month_arg->clone());
}
}
TaskTable::TaskTable(TaskCluster & parent, const Poco::Util::AbstractConfiguration & config, const String & prefix_,
const String & table_key)
: task_cluster(parent)
{
String table_prefix = prefix_ + "." + table_key + ".";
name_in_config = table_key;
cluster_pull_name = config.getString(table_prefix + "cluster_pull");
cluster_push_name = config.getString(table_prefix + "cluster_push");
table_pull.first = config.getString(table_prefix + "database_pull");
table_pull.second = config.getString(table_prefix + "table_pull");
table_push.first = config.getString(table_prefix + "database_push");
table_push.second = config.getString(table_prefix + "table_push");
/// Used as node name in ZooKeeper
table_id = escapeForFileName(cluster_push_name)
+ "." + escapeForFileName(table_push.first)
+ "." + escapeForFileName(table_push.second);
engine_push_str = config.getString(table_prefix + "engine");
{
ParserStorage parser_storage;
engine_push_ast = parseQuery(parser_storage, engine_push_str, 0);
engine_push_partition_key_ast = extractPartitionKey(engine_push_ast);
}
sharding_key_str = config.getString(table_prefix + "sharding_key");
{
ParserExpressionWithOptionalAlias parser_expression(false);
sharding_key_ast = parseQuery(parser_expression, sharding_key_str, 0);
engine_split_ast = createASTStorageDistributed(cluster_push_name, table_push.first, table_push.second, sharding_key_ast);
}
where_condition_str = config.getString(table_prefix + "where_condition", "");
if (!where_condition_str.empty())
{
ParserExpressionWithOptionalAlias parser_expression(false);
where_condition_ast = parseQuery(parser_expression, where_condition_str, 0);
// Will use canonical expression form
where_condition_str = queryToString(where_condition_ast);
}
String enabled_partitions_prefix = table_prefix + "enabled_partitions";
has_enabled_partitions = config.has(enabled_partitions_prefix);
if (has_enabled_partitions)
{
Strings keys;
config.keys(enabled_partitions_prefix, keys);
if (keys.empty())
{
/// Parse list of partition from space-separated string
String partitions_str = config.getString(table_prefix + "enabled_partitions");
boost::trim_if(partitions_str, isWhitespaceASCII);
boost::split(enabled_partitions, partitions_str, isWhitespaceASCII, boost::token_compress_on);
}
else
{
/// Parse sequence of <partition>...</partition>
for (const String & key : keys)
{
if (!startsWith(key, "partition"))
throw Exception("Unknown key " + key + " in " + enabled_partitions_prefix, ErrorCodes::UNKNOWN_ELEMENT_IN_CONFIG);
enabled_partitions.emplace_back(config.getString(enabled_partitions_prefix + "." + key));
}
}
std::copy(enabled_partitions.begin(), enabled_partitions.end(), std::inserter(enabled_partitions_set, enabled_partitions_set.begin()));
}
}
static ShardPriority getReplicasPriority(const Cluster::Addresses & replicas, const std::string & local_hostname, UInt8 random)
{
ShardPriority res;
if (replicas.empty())
return res;
res.is_remote = 1;
for (auto & replica : replicas)
{
if (isLocalAddress(DNSResolver::instance().resolveHost(replica.host_name)))
{
res.is_remote = 0;
break;
}
}
res.hostname_difference = std::numeric_limits<size_t>::max();
for (auto & replica : replicas)
{
size_t difference = getHostNameDifference(local_hostname, replica.host_name);
res.hostname_difference = std::min(difference, res.hostname_difference);
}
res.random = random;
return res;
}
template<typename RandomEngine>
void TaskTable::initShards(RandomEngine && random_engine)
{
const String & fqdn_name = getFQDNOrHostName();
std::uniform_int_distribution<UInt8> get_urand(0, std::numeric_limits<UInt8>::max());
// Compute the priority
for (auto & shard_info : cluster_pull->getShardsInfo())
{
TaskShardPtr task_shard = std::make_shared<TaskShard>(*this, shard_info);
const auto & replicas = cluster_pull->getShardsAddresses().at(task_shard->indexInCluster());
task_shard->priority = getReplicasPriority(replicas, fqdn_name, get_urand(random_engine));
all_shards.emplace_back(task_shard);
}
// Sort by priority
std::sort(all_shards.begin(), all_shards.end(),
[] (const TaskShardPtr & lhs, const TaskShardPtr & rhs)
{
return ShardPriority::greaterPriority(lhs->priority, rhs->priority);
});
// Cut local shards
auto it_first_remote = std::lower_bound(all_shards.begin(), all_shards.end(), 1,
[] (const TaskShardPtr & lhs, UInt8 is_remote)
{
return lhs->priority.is_remote < is_remote;
});
local_shards.assign(all_shards.begin(), it_first_remote);
}
void DB::TaskCluster::loadTasks(const Poco::Util::AbstractConfiguration & config, const String & base_key)
{
String prefix = base_key.empty() ? "" : base_key + ".";
clusters_prefix = prefix + "remote_servers";
if (!config.has(clusters_prefix))
throw Exception("You should specify list of clusters in " + clusters_prefix, ErrorCodes::BAD_ARGUMENTS);
Poco::Util::AbstractConfiguration::Keys tables_keys;
config.keys(prefix + "tables", tables_keys);
for (const auto & table_key : tables_keys)
{
table_tasks.emplace_back(*this, config, prefix + "tables", table_key);
}
}
void DB::TaskCluster::reloadSettings(const Poco::Util::AbstractConfiguration & config, const String & base_key)
{
String prefix = base_key.empty() ? "" : base_key + ".";
max_workers = config.getUInt64(prefix + "max_workers");
settings_common = Settings();
if (config.has(prefix + "settings"))
settings_common.loadSettingsFromConfig(prefix + "settings", config);
settings_pull = settings_common;
if (config.has(prefix + "settings_pull"))
settings_pull.loadSettingsFromConfig(prefix + "settings_pull", config);
settings_push = settings_common;
if (config.has(prefix + "settings_push"))
settings_push.loadSettingsFromConfig(prefix + "settings_push", config);
auto set_default_value = [] (auto && setting, auto && default_value)
{
setting = setting.changed ? setting.value : default_value;
};
/// Override important settings
settings_pull.readonly = 1;
settings_push.insert_distributed_sync = 1;
set_default_value(settings_pull.load_balancing, LoadBalancing::NEAREST_HOSTNAME);
set_default_value(settings_pull.max_threads, 1);
set_default_value(settings_pull.max_block_size, 8192UL);
set_default_value(settings_pull.preferred_block_size_bytes, 0);
set_default_value(settings_push.insert_distributed_timeout, 0);
}
} // end of an anonymous namespace
class ClusterCopier
{
public:
ClusterCopier(const String & task_path_,
const String & host_id_,
const String & proxy_database_name_,
Context & context_)
:
task_zookeeper_path(task_path_),
host_id(host_id_),
working_database_name(proxy_database_name_),
context(context_),
log(&Poco::Logger::get("ClusterCopier"))
{
}
void init()
{
auto zookeeper = context.getZooKeeper();
task_description_watch_callback = [this] (const Coordination::WatchResponse & response)
{
if (response.error != Coordination::ZOK)
return;
UInt64 version = ++task_descprtion_version;
LOG_DEBUG(log, "Task description should be updated, local version " << version);
};
task_description_path = task_zookeeper_path + "/description";
task_cluster = std::make_unique<TaskCluster>(task_zookeeper_path, working_database_name);
reloadTaskDescription();
task_cluster_initial_config = task_cluster_current_config;
task_cluster->loadTasks(*task_cluster_initial_config);
context.setClustersConfig(task_cluster_initial_config, task_cluster->clusters_prefix);
/// Set up shards and their priority
task_cluster->random_engine.seed(task_cluster->random_device());
for (auto & task_table : task_cluster->table_tasks)
{
task_table.cluster_pull = context.getCluster(task_table.cluster_pull_name);
task_table.cluster_push = context.getCluster(task_table.cluster_push_name);
task_table.initShards(task_cluster->random_engine);
}
LOG_DEBUG(log, "Will process " << task_cluster->table_tasks.size() << " table tasks");
/// Do not initialize tables, will make deferred initialization in process()
zookeeper->createAncestors(getWorkersPathVersion() + "/");
zookeeper->createAncestors(getWorkersPath() + "/");
}
template <typename T>
decltype(auto) retry(T && func, UInt64 max_tries = 100)
{
std::exception_ptr exception;
for (UInt64 try_number = 1; try_number <= max_tries; ++try_number)
{
try
{
return func();
}
catch (...)
{
exception = std::current_exception();
if (try_number < max_tries)
{
tryLogCurrentException(log, "Will retry");
std::this_thread::sleep_for(default_sleep_time);
}
}
}
std::rethrow_exception(exception);
}
void discoverShardPartitions(const ConnectionTimeouts & timeouts, const TaskShardPtr & task_shard)
{
TaskTable & task_table = task_shard->task_table;
LOG_INFO(log, "Discover partitions of shard " << task_shard->getDescription());
auto get_partitions = [&] () { return getShardPartitions(timeouts, *task_shard); };
auto existing_partitions_names = retry(get_partitions, 60);
Strings filtered_partitions_names;
Strings missing_partitions;
/// Check that user specified correct partition names
auto check_partition_format = [] (const DataTypePtr & type, const String & partition_text_quoted)
{
MutableColumnPtr column_dummy = type->createColumn();
ReadBufferFromString rb(partition_text_quoted);
try
{
type->deserializeAsTextQuoted(*column_dummy, rb, FormatSettings());
}
catch (Exception & e)
{
throw Exception("Partition " + partition_text_quoted + " has incorrect format. " + e.displayText(), ErrorCodes::BAD_ARGUMENTS);
}
};
if (task_table.has_enabled_partitions)
{
/// Process partition in order specified by <enabled_partitions/>
for (const String & partition_name : task_table.enabled_partitions)
{
/// Check that user specified correct partition names
check_partition_format(task_shard->partition_key_column.type, partition_name);
auto it = existing_partitions_names.find(partition_name);
/// Do not process partition if it is not in enabled_partitions list
if (it == existing_partitions_names.end())
{
missing_partitions.emplace_back(partition_name);
continue;
}
filtered_partitions_names.emplace_back(*it);
}
for (const String & partition_name : existing_partitions_names)
{
if (!task_table.enabled_partitions_set.count(partition_name))
{
LOG_DEBUG(log, "Partition " << partition_name << " will not be processed, since it is not in "
<< "enabled_partitions of " << task_table.table_id);
}
}
}
else
{
for (const String & partition_name : existing_partitions_names)
filtered_partitions_names.emplace_back(partition_name);
}
for (const String & partition_name : filtered_partitions_names)
{
task_shard->partition_tasks.emplace(partition_name, ShardPartition(*task_shard, partition_name));
task_shard->checked_partitions.emplace(partition_name, true);
}
if (!missing_partitions.empty())
{
std::stringstream ss;
for (const String & missing_partition : missing_partitions)
ss << " " << missing_partition;
LOG_WARNING(log, "There are no " << missing_partitions.size() << " partitions from enabled_partitions in shard "
<< task_shard->getDescription() << " :" << ss.str());
}
LOG_DEBUG(log, "Will copy " << task_shard->partition_tasks.size() << " partitions from shard " << task_shard->getDescription());
}
/// Compute set of partitions, assume set of partitions aren't changed during the processing
void discoverTablePartitions(const ConnectionTimeouts & timeouts, TaskTable & task_table, UInt64 num_threads = 0)
{
/// Fetch partitions list from a shard
{
ThreadPool thread_pool(num_threads ? num_threads : 2 * getNumberOfPhysicalCPUCores());
for (const TaskShardPtr & task_shard : task_table.all_shards)
thread_pool.scheduleOrThrowOnError([this, timeouts, task_shard]() { discoverShardPartitions(timeouts, task_shard); });
LOG_DEBUG(log, "Waiting for " << thread_pool.active() << " setup jobs");
thread_pool.wait();
}
}
void uploadTaskDescription(const std::string & task_path, const std::string & task_file, const bool force)
{
auto local_task_description_path = task_path + "/description";
String task_config_str;
{
ReadBufferFromFile in(task_file);
readStringUntilEOF(task_config_str, in);
}
if (task_config_str.empty())
return;
auto zookeeper = context.getZooKeeper();
zookeeper->createAncestors(local_task_description_path);
auto code = zookeeper->tryCreate(local_task_description_path, task_config_str, zkutil::CreateMode::Persistent);
if (code && force)
zookeeper->createOrUpdate(local_task_description_path, task_config_str, zkutil::CreateMode::Persistent);
LOG_DEBUG(log, "Task description " << ((code && !force) ? "not " : "") << "uploaded to " << local_task_description_path << " with result " << code << " ("<< zookeeper->error2string(code) << ")");
}
void reloadTaskDescription()
{
auto zookeeper = context.getZooKeeper();
task_description_watch_zookeeper = zookeeper;
String task_config_str;
Coordination::Stat stat;
int code;
zookeeper->tryGetWatch(task_description_path, task_config_str, &stat, task_description_watch_callback, &code);
if (code)
throw Exception("Can't get description node " + task_description_path, ErrorCodes::BAD_ARGUMENTS);
LOG_DEBUG(log, "Loading description, zxid=" << task_descprtion_current_stat.czxid);
auto config = getConfigurationFromXMLString(task_config_str);
/// Setup settings
task_cluster->reloadSettings(*config);
context.getSettingsRef() = task_cluster->settings_common;
task_cluster_current_config = config;
task_descprtion_current_stat = stat;
}
void updateConfigIfNeeded()
{
UInt64 version_to_update = task_descprtion_version;
bool is_outdated_version = task_descprtion_current_version != version_to_update;
bool is_expired_session = !task_description_watch_zookeeper || task_description_watch_zookeeper->expired();
if (!is_outdated_version && !is_expired_session)
return;
LOG_DEBUG(log, "Updating task description");
reloadTaskDescription();
task_descprtion_current_version = version_to_update;
}
void process(const ConnectionTimeouts & timeouts)
{
for (TaskTable & task_table : task_cluster->table_tasks)
{
LOG_INFO(log, "Process table task " << task_table.table_id << " with "
<< task_table.all_shards.size() << " shards, " << task_table.local_shards.size() << " of them are local ones");
if (task_table.all_shards.empty())
continue;
/// Discover partitions of each shard and total set of partitions
if (!task_table.has_enabled_partitions)
{
/// If there are no specified enabled_partitions, we must discover them manually
discoverTablePartitions(timeouts, task_table);
/// After partitions of each shard are initialized, initialize cluster partitions
for (const TaskShardPtr & task_shard : task_table.all_shards)
{
for (const auto & partition_elem : task_shard->partition_tasks)
{
const String & partition_name = partition_elem.first;
task_table.cluster_partitions.emplace(partition_name, ClusterPartition{});
}
}
for (auto & partition_elem : task_table.cluster_partitions)
{
const String & partition_name = partition_elem.first;
for (const TaskShardPtr & task_shard : task_table.all_shards)
task_shard->checked_partitions.emplace(partition_name);
task_table.ordered_partition_names.emplace_back(partition_name);
}