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fix stupid bug + codestyle

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This commit is contained in:
Nikita Mikhaylov 2019-12-30 18:28:45 +03:00
parent 28d0f3324a
commit cce0097d9e
3 changed files with 24 additions and 11 deletions
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23
dbms/src/Dictionaries/CacheDictionary.cpp
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@ -716,22 +716,35 @@ void CacheDictionary::updateThreadFunction()
setThreadName("AsyncUpdater");
while (!finished)
{
UpdateUnitPtr first_popped;
update_queue.pop(first_popped);
/// Here we pop as many unit pointers from update queue as we can.
/// We fix current size to avoid livelock (or too long waiting),
/// when this thread pops from the queue and other threads push to the queue.
const size_t current_queue_size = update_queue.size();
std::vector<UpdateUnitPtr> update_request(current_queue_size);
/// Word "bunch" must present in this log message, because it is being checked in tests.
if (current_queue_size > 0)
LOG_DEBUG(log, "Performing a bunch of keys update in cache dictionary.");
/// We use deque since there is first_popped pointer.
/// And we have to add to the update_request without breaking order.
std::deque<UpdateUnitPtr> update_request(current_queue_size);
for (auto & unit_ptr: update_request)
update_queue.pop(unit_ptr);
update_request.push_front(first_popped);
/// Here we prepare total count of all requested ids
/// not to do useless allocations later.
size_t requested_keys_count = 0;
size_t total_requested_keys_count = 0;
for (auto & unit_ptr: update_request)
requested_keys_count += unit_ptr->requested_ids.size();
total_requested_keys_count += unit_ptr->requested_ids.size();
std::vector<Key> concatenated_requested_ids;
concatenated_requested_ids.reserve(requested_keys_count);
concatenated_requested_ids.reserve(total_requested_keys_count);
for (auto & unit_ptr: update_request)
std::for_each(std::begin(unit_ptr->requested_ids), std::end(unit_ptr->requested_ids),
[&] (const Key & key) {concatenated_requested_ids.push_back(key);});
@ -754,8 +767,10 @@ void CacheDictionary::updateThreadFunction()
/// Notify all threads about finished updating the bunch of ids
/// where their own ids were included.
std::unique_lock<std::mutex> lock(update_mutex);
for (auto & unit_ptr: update_request)
unit_ptr->is_done = true;
is_update_finished.notify_all();
}
catch (...)

2
dbms/src/Dictionaries/CacheDictionary.h
View File

@ -52,7 +52,7 @@ public:
const bool allow_read_expired_keys_,
const size_t max_update_queue_size_,
const size_t update_queue_push_timeout_milliseconds_,
const size_t timeout_for_each_update_finish_);
const size_t each_update_finish_timeout_seconds_);
~CacheDictionary() override;

6
dbms/src/Dictionaries/CacheDictionary.inc.h
View File

@ -21,7 +21,6 @@ extern const Event DictCacheRequestTimeNs;
extern const Event DictCacheRequests;
extern const Event DictCacheLockWriteNs;
extern const Event DictCacheLockReadNs;
extern const Event DictCacheReadsRottedValues;
}
namespace CurrentMetrics
@ -175,8 +174,7 @@ void CacheDictionary::getItemsString(
/// save on some allocations
out->getOffsets().reserve(rows);
auto &attribute_array = std::get<ContainerPtrType < StringRef>>
(attribute.arrays);
auto & attribute_array = std::get<ContainerPtrType < StringRef>>(attribute.arrays);
auto found_outdated_values = false;
@ -274,7 +272,7 @@ void CacheDictionary::getItemsString(
query_count.fetch_add(rows, std::memory_order_relaxed);
hit_count.fetch_add(rows - cache_expired_ids.size() - cache_not_found_ids.size(), std::memory_order_release);
/// Async udpdare of expired keys.
/// Async update of expired keys.
if (cache_not_found_ids.empty())
{
if (allow_read_expired_keys && !cache_expired_ids.empty())