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
|
#include <Storages/MergeTree/MergePlainMergeTreeTask.h>
#include <Storages/MergeTree/MergeTreeData.h>
#include <Storages/StorageMergeTree.h>
#include <Storages/MergeTree/MergeTreeDataMergerMutator.h>
#include <Interpreters/TransactionLog.h>
#include <Common/ProfileEventsScope.h>
#include <Common/ProfileEvents.h>
#include <Common/ThreadFuzzer.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
}
StorageID MergePlainMergeTreeTask::getStorageID() const
{
return storage.getStorageID();
}
void MergePlainMergeTreeTask::onCompleted()
{
bool delay = state == State::SUCCESS;
task_result_callback(delay);
}
bool MergePlainMergeTreeTask::executeStep()
{
/// All metrics will be saved in the thread_group, including all scheduled tasks.
/// In profile_counters only metrics from this thread will be saved.
ProfileEventsScope profile_events_scope(&profile_counters);
/// Make out memory tracker a parent of current thread memory tracker
std::optional<ThreadGroupSwitcher> switcher;
if (merge_list_entry)
{
switcher.emplace((*merge_list_entry)->thread_group);
}
switch (state)
{
case State::NEED_PREPARE :
{
prepare();
state = State::NEED_EXECUTE;
return true;
}
case State::NEED_EXECUTE :
{
try
{
if (merge_task->execute())
return true;
state = State::NEED_FINISH;
return true;
}
catch (...)
{
write_part_log(ExecutionStatus::fromCurrentException("", true));
throw;
}
}
case State::NEED_FINISH :
{
finish();
state = State::SUCCESS;
return false;
}
case State::SUCCESS:
{
throw Exception(ErrorCodes::LOGICAL_ERROR, "Task with state SUCCESS mustn't be executed again");
}
}
}
void MergePlainMergeTreeTask::prepare()
{
future_part = merge_mutate_entry->future_part;
stopwatch_ptr = std::make_unique<Stopwatch>();
task_context = createTaskContext();
merge_list_entry = storage.getContext()->getMergeList().insert(
storage.getStorageID(),
future_part,
task_context);
write_part_log = [this] (const ExecutionStatus & execution_status)
{
auto profile_counters_snapshot = std::make_shared<ProfileEvents::Counters::Snapshot>(profile_counters.getPartiallyAtomicSnapshot());
merge_task.reset();
storage.writePartLog(
PartLogElement::MERGE_PARTS,
execution_status,
stopwatch_ptr->elapsed(),
future_part->name,
new_part,
future_part->parts,
merge_list_entry.get(),
std::move(profile_counters_snapshot));
};
transfer_profile_counters_to_initial_query = [this, query_thread_group = CurrentThread::getGroup()] ()
{
if (query_thread_group)
{
auto task_thread_group = (*merge_list_entry)->thread_group;
auto task_counters_snapshot = task_thread_group->performance_counters.getPartiallyAtomicSnapshot();
auto & query_counters = query_thread_group->performance_counters;
for (ProfileEvents::Event i = ProfileEvents::Event(0); i < ProfileEvents::end(); ++i)
query_counters.incrementNoTrace(i, task_counters_snapshot[i]);
}
};
merge_task = storage.merger_mutator.mergePartsToTemporaryPart(
future_part,
metadata_snapshot,
merge_list_entry.get(),
{} /* projection_merge_list_element */,
table_lock_holder,
time(nullptr),
task_context,
merge_mutate_entry->tagger->reserved_space,
deduplicate,
deduplicate_by_columns,
cleanup,
storage.merging_params,
txn);
}
void MergePlainMergeTreeTask::finish()
{
new_part = merge_task->getFuture().get();
MergeTreeData::Transaction transaction(storage, txn.get());
storage.merger_mutator.renameMergedTemporaryPart(new_part, future_part->parts, txn, transaction);
transaction.commit();
ThreadFuzzer::maybeInjectSleep();
ThreadFuzzer::maybeInjectMemoryLimitException();
write_part_log({});
storage.incrementMergedPartsProfileEvent(new_part->getType());
transfer_profile_counters_to_initial_query();
if (auto txn_ = txn_holder.getTransaction())
{
/// Explicitly commit the transaction if we own it (it's a background merge, not OPTIMIZE)
TransactionLog::instance().commitTransaction(txn_, /* throw_on_unknown_status */ false);
ThreadFuzzer::maybeInjectSleep();
ThreadFuzzer::maybeInjectMemoryLimitException();
}
}
ContextMutablePtr MergePlainMergeTreeTask::createTaskContext() const
{
auto context = Context::createCopy(storage.getContext());
context->makeQueryContext();
auto queryId = getQueryId();
context->setCurrentQueryId(queryId);
return context;
}
}
|
