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Fix data race, refactor

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This commit is contained in:
kssenii 2023-04-17 13:30:51 +02:00
parent eafa3e8f64
commit 0b62354261
6 changed files with 135 additions and 155 deletions
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140
src/Storages/RabbitMQ/RabbitMQConsumer.cpp
View File

@ -5,6 +5,7 @@
#include <memory>
#include <Storages/RabbitMQ/RabbitMQConsumer.h>
#include <Storages/RabbitMQ/RabbitMQHandler.h>
#include <Storages/RabbitMQ/RabbitMQConnection.h>
#include <IO/ReadBufferFromMemory.h>
#include <Common/logger_useful.h>
#include "Poco/Timer.h"
@ -34,7 +35,7 @@ RabbitMQConsumer::RabbitMQConsumer(
{
}
void RabbitMQConsumer::shutdown()
void RabbitMQConsumer::stop()
{
stopped = true;
cv.notify_one();
@ -53,10 +54,9 @@ void RabbitMQConsumer::subscribe()
consumer_channel->consume(queue_name)
.onSuccess([&](const std::string & /* consumer_tag */)
{
LOG_TRACE(log, "Consumer on channel {} is subscribed to queue {}", channel_id, queue_name);
if (++subscribed == queues.size())
wait_subscription.store(false);
LOG_TRACE(
log, "Consumer on channel {} ({}/{}) is subscribed to queue {}",
channel_id, subscriptions_num, queues.size(), queue_name);
})
.onReceived([&](const AMQP::Message & message, uint64_t delivery_tag, bool redelivered)
{
@ -64,9 +64,15 @@ void RabbitMQConsumer::subscribe()
{
String message_received = std::string(message.body(), message.body() + message.bodySize());
if (!received.push({message_received, message.hasMessageID() ? message.messageID() : "",
message.hasTimestamp() ? message.timestamp() : 0,
redelivered, AckTracker(delivery_tag, channel_id)}))
MessageData result{
.message = message_received,
.message_id = message.hasMessageID() ? message.messageID() : "",
.timestamp = message.hasTimestamp() ? message.timestamp() : 0,
.redelivered = redelivered,
.delivery_tag = delivery_tag,
.channel_id = channel_id};
if (!received.push(std::move(result)))
throw Exception(ErrorCodes::LOGICAL_ERROR, "Could not push to received queue");
cv.notify_one();
@ -74,98 +80,100 @@ void RabbitMQConsumer::subscribe()
})
.onError([&](const char * message)
{
/* End up here either if channel ends up in an error state (then there will be resubscription) or consume call error, which
* arises from queue settings mismatch or queue level error, which should not happen as no one else is supposed to touch them
/* End up here either if channel ends up in an error state (then there will be resubscription)
* or consume call error, which arises from queue settings mismatch or queue level error,
* which should not happen as no one else is supposed to touch them
*/
LOG_ERROR(log, "Consumer failed on channel {}. Reason: {}", channel_id, message);
wait_subscription.store(false);
state = State::ERROR;
});
}
}
bool RabbitMQConsumer::ackMessages()
bool RabbitMQConsumer::ackMessages(const CommitInfo & commit_info)
{
AckTracker record_info = last_inserted_record_info;
if (state != State::OK)
return false;
/* Do not send ack to server if message's channel is not the same as current running channel because delivery tags are scoped per
* channel, so if channel fails, all previous delivery tags become invalid
*/
if (record_info.channel_id == channel_id && record_info.delivery_tag && record_info.delivery_tag > prev_tag)
/// Nothing to ack.
if (!commit_info.delivery_tag)
return false;
/// Do not send ack to server if message's channel is not the same as
/// current running channel because delivery tags are scoped per channel,
/// so if channel fails, all previous delivery tags become invalid.
if (commit_info.channel_id != channel_id)
return false;
/// Duplicate ack?
if (commit_info.delivery_tag > last_commited_delivery_tag
&& consumer_channel->ack(commit_info.delivery_tag, AMQP::multiple))
{
/// Commit all received messages with delivery tags from last committed to last inserted
if (!consumer_channel->ack(record_info.delivery_tag, AMQP::multiple))
{
LOG_ERROR(log, "Failed to commit messages with delivery tags from last committed to {} on channel {}",
record_info.delivery_tag, channel_id);
return false;
}
last_commited_delivery_tag = commit_info.delivery_tag;
prev_tag = record_info.delivery_tag;
LOG_TRACE(log, "Consumer committed messages with deliveryTags up to {} on channel {}", record_info.delivery_tag, channel_id);
LOG_TRACE(
log, "Consumer committed messages with deliveryTags up to {} on channel {}",
last_commited_delivery_tag, channel_id);
return true;
}
return true;
LOG_ERROR(
log,
"Did not commit messages for {}:{}, (current commit point {}:{})",
commit_info.channel_id, commit_info.delivery_tag,
channel_id, last_commited_delivery_tag);
return false;
}
void RabbitMQConsumer::updateAckTracker(AckTracker record_info)
void RabbitMQConsumer::updateChannel(RabbitMQConnection & connection)
{
if (record_info.delivery_tag && channel_error.load())
return;
if (!record_info.delivery_tag)
prev_tag = 0;
last_inserted_record_info = record_info;
}
void RabbitMQConsumer::setupChannel()
{
if (!consumer_channel)
return;
wait_subscription.store(true);
state = State::INITIALIZING;
last_commited_delivery_tag = 0;
consumer_channel = connection.createChannel();
consumer_channel->onReady([&]()
{
/* First number indicates current consumer buffer; second number indicates serial number of created channel for current buffer,
* i.e. if channel fails - another one is created and its serial number is incremented; channel_base is to guarantee that
* channel_id is unique for each table
*/
channel_id = std::to_string(channel_id_base) + "_" + std::to_string(channel_id_counter++) + "_" + channel_base;
LOG_TRACE(log, "Channel {} is created", channel_id);
try
{
/// 1. channel_id_base - indicates current consumer buffer.
/// 2. channel_id_couner - indicates serial number of created channel for current buffer
/// (incremented on each channel update).
/// 3. channel_base is to guarantee that channel_id is unique for each table.
channel_id = fmt::format("{}_{}_{}", channel_id_base, channel_id_counter++, channel_base);
subscribed = 0;
subscribe();
channel_error.store(false);
LOG_TRACE(log, "Channel {} is successfully created", channel_id);
subscriptions_num = 0;
subscribe();
state = State::OK;
}
catch (...)
{
state = State::ERROR;
tryLogCurrentException(__PRETTY_FUNCTION__);
}
});
consumer_channel->onError([&](const char * message)
{
LOG_ERROR(log, "Channel {} error: {}", channel_id, message);
channel_error.store(true);
wait_subscription.store(false);
LOG_ERROR(log, "Channel {} in an error state: {}", channel_id, message);
state = State::ERROR;
});
}
bool RabbitMQConsumer::needChannelUpdate()
{
if (wait_subscription)
return false;
return channel_error || !consumer_channel || !consumer_channel->usable();
chassert(consumer_channel);
return state == State::ERROR;
}
void RabbitMQConsumer::iterateEventLoop()
{
event_handler.iterateLoop();
}
ReadBufferPtr RabbitMQConsumer::consume()
{
if (stopped || !received.tryPop(current))

68
src/Storages/RabbitMQ/RabbitMQConsumer.h
View File

@ -19,6 +19,7 @@ namespace DB
{
class RabbitMQHandler;
class RabbitMQConnection;
using ChannelPtr = std::unique_ptr<AMQP::TcpChannel>;
static constexpr auto SANITY_TIMEOUT = 1000 * 60 * 10; /// 10min.
@ -27,55 +28,44 @@ class RabbitMQConsumer
public:
RabbitMQConsumer(
RabbitMQHandler & event_handler_,
std::vector<String> & queues_,
size_t channel_id_base_,
const String & channel_base_,
Poco::Logger * log_,
uint32_t queue_size_);
RabbitMQHandler & event_handler_,
std::vector<String> & queues_,
size_t channel_id_base_,
const String & channel_base_,
Poco::Logger * log_,
uint32_t queue_size_);
struct AckTracker
struct CommitInfo
{
UInt64 delivery_tag;
UInt64 delivery_tag = 0;
String channel_id;
AckTracker() = default;
AckTracker(UInt64 tag, String id) : delivery_tag(tag), channel_id(id) {}
};
struct MessageData
{
String message;
String message_id;
uint64_t timestamp = 0;
UInt64 timestamp = 0;
bool redelivered = false;
AckTracker track{};
UInt64 delivery_tag = 0;
String channel_id;
};
const MessageData & currentMessage() { return current; }
/// Return read buffer containing next available message
/// or nullptr if there are no messages to process.
ReadBufferPtr consume();
ChannelPtr & getChannel() { return consumer_channel; }
void setupChannel();
bool needChannelUpdate();
void shutdown();
void updateQueues(std::vector<String> & queues_) { queues = queues_; }
size_t queuesCount() { return queues.size(); }
void updateChannel(RabbitMQConnection & connection);
void stop();
bool isConsumerStopped() const { return stopped.load(); }
bool ackMessages();
void updateAckTracker(AckTracker record = AckTracker());
bool ackMessages(const CommitInfo & commit_info);
bool hasPendingMessages() { return !received.empty(); }
auto getChannelID() const { return current.track.channel_id; }
auto getDeliveryTag() const { return current.track.delivery_tag; }
auto getRedelivered() const { return current.redelivered; }
auto getMessageID() const { return current.message_id; }
auto getTimestamp() const { return current.timestamp; }
void waitForMessages(std::optional<uint64_t> timeout_ms = std::nullopt)
{
std::unique_lock lock(mutex);
@ -88,24 +78,36 @@ public:
private:
void subscribe();
void iterateEventLoop();
bool isChannelUsable();
void updateCommitInfo(CommitInfo record);
ChannelPtr consumer_channel;
RabbitMQHandler & event_handler; /// Used concurrently, but is thread safe.
std::vector<String> queues;
const std::vector<String> queues;
const String channel_base;
const size_t channel_id_base;
Poco::Logger * log;
std::atomic<bool> stopped;
String channel_id;
std::atomic<bool> channel_error = true, wait_subscription = false;
UInt64 channel_id_counter = 0;
enum class State
{
NONE,
INITIALIZING,
OK,
ERROR,
};
std::atomic<State> state = State::NONE;
size_t subscriptions_num = 0;
ConcurrentBoundedQueue<MessageData> received;
MessageData current;
size_t subscribed = 0;
AckTracker last_inserted_record_info;
UInt64 prev_tag = 0, channel_id_counter = 0;
UInt64 last_commited_delivery_tag;
std::condition_variable cv;
std::mutex mutex;

30
src/Storages/RabbitMQ/RabbitMQSource.cpp
View File

@ -99,10 +99,7 @@ void RabbitMQSource::updateChannel()
if (!consumer)
return;
consumer->updateAckTracker();
if (storage.updateChannel(consumer->getChannel()))
consumer->setupChannel();
consumer->updateChannel(storage.getConnection());
}
Chunk RabbitMQSource::generate()
@ -137,6 +134,7 @@ Chunk RabbitMQSource::generateImpl()
StreamingFormatExecutor executor(non_virtual_header, input_format);
size_t total_rows = 0;
RabbitMQConsumer::CommitInfo current_commit_info;
while (true)
{
size_t new_rows = 0;
@ -149,26 +147,21 @@ Chunk RabbitMQSource::generateImpl()
if (new_rows)
{
auto exchange_name = storage.getExchange();
auto channel_id = consumer->getChannelID();
auto delivery_tag = consumer->getDeliveryTag();
auto redelivered = consumer->getRedelivered();
auto message_id = consumer->getMessageID();
auto timestamp = consumer->getTimestamp();
consumer->updateAckTracker({delivery_tag, channel_id});
const auto exchange_name = storage.getExchange();
const auto & message = consumer->currentMessage();
for (size_t i = 0; i < new_rows; ++i)
{
virtual_columns[0]->insert(exchange_name);
virtual_columns[1]->insert(channel_id);
virtual_columns[2]->insert(delivery_tag);
virtual_columns[3]->insert(redelivered);
virtual_columns[4]->insert(message_id);
virtual_columns[5]->insert(timestamp);
virtual_columns[1]->insert(message.channel_id);
virtual_columns[2]->insert(message.delivery_tag);
virtual_columns[3]->insert(message.redelivered);
virtual_columns[4]->insert(message.message_id);
virtual_columns[5]->insert(message.timestamp);
}
total_rows += new_rows;
current_commit_info = {message.delivery_tag, message.channel_id};
}
else if (total_rows == 0)
{
@ -210,6 +203,7 @@ Chunk RabbitMQSource::generateImpl()
for (auto & column : virtual_columns)
result_columns.push_back(std::move(column));
commit_info = current_commit_info;
return Chunk(std::move(result_columns), total_rows);
}
@ -219,7 +213,7 @@ bool RabbitMQSource::sendAck()
if (!consumer)
return false;
if (!consumer->ackMessages())
if (!consumer->ackMessages(commit_info))
return false;
return true;

2
src/Storages/RabbitMQ/RabbitMQSource.h
View File

@ -51,6 +51,8 @@ private:
uint64_t max_execution_time_ms = 0;
Stopwatch total_stopwatch {CLOCK_MONOTONIC_COARSE};
RabbitMQConsumer::CommitInfo commit_info;
RabbitMQSource(
StorageRabbitMQ & storage_,
const StorageSnapshotPtr & storage_snapshot_,

46
src/Storages/RabbitMQ/StorageRabbitMQ.cpp
View File

@ -371,6 +371,14 @@ void StorageRabbitMQ::initRabbitMQ()
for (const auto i : collections::range(0, num_queues))
bindQueue(i + 1, *rabbit_channel);
if (queues.size() != num_queues)
{
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Expected all queues to be initialized (but having {}/{})",
queues.size(), num_queues);
}
LOG_TRACE(log, "RabbitMQ setup completed");
rabbit_is_ready = true;
rabbit_channel->close();
@ -593,35 +601,6 @@ void StorageRabbitMQ::bindQueue(size_t queue_id, AMQP::TcpChannel & rabbit_chann
}
bool StorageRabbitMQ::updateChannel(ChannelPtr & channel)
{
try
{
channel = connection->createChannel();
return true;
}
catch (...)
{
tryLogCurrentException(log);
return false;
}
}
void StorageRabbitMQ::prepareChannelForConsumer(RabbitMQConsumerPtr consumer)
{
if (!consumer)
return;
if (consumer->queuesCount() != queues.size())
consumer->updateQueues(queues);
consumer->updateAckTracker();
if (updateChannel(consumer->getChannel()))
consumer->setupChannel();
}
void StorageRabbitMQ::unbindExchange()
{
/* This is needed because with RabbitMQ (without special adjustments) can't, for example, properly make mv if there was insert query
@ -820,7 +799,7 @@ void StorageRabbitMQ::shutdown()
shutdown_called = true;
for (auto & consumer : consumers_ref)
consumer.lock()->shutdown();
consumer.lock()->stop();
LOG_TRACE(log, "Deactivating background tasks");
@ -982,7 +961,7 @@ void StorageRabbitMQ::initializeBuffers()
if (!initialized)
{
for (const auto & consumer : consumers)
prepareChannelForConsumer(consumer);
consumer->updateChannel(*connection);
initialized = true;
}
}
@ -1144,10 +1123,7 @@ bool StorageRabbitMQ::tryStreamToViews()
++queue_empty;
if (source->needChannelUpdate())
{
auto consumer = source->getBuffer();
prepareChannelForConsumer(consumer);
}
source->getBuffer()->updateChannel(*connection);
/* false is returned by the sendAck function in only two cases:
* 1) if connection failed. In this case all channels will be closed and will be unable to send ack. Also ack is made based on

4
src/Storages/RabbitMQ/StorageRabbitMQ.h
View File

@ -72,9 +72,7 @@ public:
String getExchange() const { return exchange_name; }
void unbindExchange();
bool updateChannel(ChannelPtr & channel);
void updateQueues(std::vector<String> & queues_) { queues_ = queues; }
void prepareChannelForConsumer(RabbitMQConsumerPtr consumer);
RabbitMQConnection & getConnection() { return *connection; }
void incrementReader();
void decrementReader();