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#include <Storages/MergeTree/ReplicatedMergeMutateTaskBase.h>
#include <Storages/StorageReplicatedMergeTree.h>
#include <Storages/MergeTree/ReplicatedMergeTreeQueue.h>
#include <Common/ProfileEventsScope.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NO_REPLICA_HAS_PART;
extern const int LOGICAL_ERROR;
extern const int ABORTED;
extern const int PART_IS_TEMPORARILY_LOCKED;
}
StorageID ReplicatedMergeMutateTaskBase::getStorageID() const
{
return storage.getStorageID();
}
void ReplicatedMergeMutateTaskBase::onCompleted()
{
bool successfully_executed = state == State::SUCCESS;
task_result_callback(successfully_executed);
}
bool ReplicatedMergeMutateTaskBase::executeStep()
{
/// Metrics will be saved in the local profile_counters.
ProfileEventsScope profile_events_scope(&profile_counters);
std::exception_ptr saved_exception;
bool retryable_error = false;
try
{
/// We don't have any backoff for failed entries
/// we just count amount of tries for each of them.
try
{
return executeImpl();
}
catch (const Exception & e)
{
if (e.code() == ErrorCodes::NO_REPLICA_HAS_PART)
{
/// If no one has the right part, probably not all replicas work; We will not write to log with Error level.
LOG_INFO(log, getExceptionMessageAndPattern(e, /* with_stacktrace */ false));
retryable_error = true;
}
else if (e.code() == ErrorCodes::ABORTED)
{
/// Interrupted merge or downloading a part is not an error.
LOG_INFO(log, getExceptionMessageAndPattern(e, /* with_stacktrace */ false));
retryable_error = true;
}
else if (e.code() == ErrorCodes::PART_IS_TEMPORARILY_LOCKED)
{
/// Part cannot be added temporarily
LOG_INFO(log, getExceptionMessageAndPattern(e, /* with_stacktrace */ false));
retryable_error = true;
storage.cleanup_thread.wakeup();
}
else
tryLogCurrentException(log, __PRETTY_FUNCTION__);
/** This exception will be written to the queue element, and it can be looked up using `system.replication_queue` table.
* The thread that performs this action will sleep a few seconds after the exception.
* See `queue.processEntry` function.
*/
throw;
}
catch (...)
{
tryLogCurrentException(log, __PRETTY_FUNCTION__);
throw;
}
}
catch (...)
{
saved_exception = std::current_exception();
}
if (!retryable_error && saved_exception)
{
std::lock_guard lock(storage.queue.state_mutex);
auto & log_entry = selected_entry->log_entry;
log_entry->exception = saved_exception;
log_entry->last_exception_time = time(nullptr);
if (log_entry->type == ReplicatedMergeTreeLogEntryData::MUTATE_PART)
{
/// Record the exception in the system.mutations table.
Int64 result_data_version = MergeTreePartInfo::fromPartName(log_entry->new_part_name, storage.queue.format_version)
.getDataVersion();
auto source_part_info = MergeTreePartInfo::fromPartName(
log_entry->source_parts.at(0), storage.queue.format_version);
auto in_partition = storage.queue.mutations_by_partition.find(source_part_info.partition_id);
if (in_partition != storage.queue.mutations_by_partition.end())
{
auto mutations_begin_it = in_partition->second.upper_bound(source_part_info.getDataVersion());
auto mutations_end_it = in_partition->second.upper_bound(result_data_version);
for (auto it = mutations_begin_it; it != mutations_end_it; ++it)
{
ReplicatedMergeTreeQueue::MutationStatus & status = *it->second;
status.latest_failed_part = log_entry->source_parts.at(0);
status.latest_failed_part_info = source_part_info;
status.latest_fail_time = time(nullptr);
status.latest_fail_reason = getExceptionMessage(saved_exception, false);
}
}
}
}
if (saved_exception)
std::rethrow_exception(saved_exception);
return false;
}
bool ReplicatedMergeMutateTaskBase::executeImpl()
{
std::optional<ThreadGroupSwitcher> switcher;
if (merge_mutate_entry)
switcher.emplace((*merge_mutate_entry)->thread_group);
auto remove_processed_entry = [&] () -> bool
{
try
{
storage.queue.removeProcessedEntry(storage.getZooKeeper(), selected_entry->log_entry);
state = State::SUCCESS;
}
catch (...)
{
tryLogCurrentException(__PRETTY_FUNCTION__);
}
return false;
};
auto execute_fetch = [&] (bool need_to_check_missing_part) -> bool
{
if (storage.executeFetch(entry, need_to_check_missing_part))
return remove_processed_entry();
return false;
};
switch (state)
{
case State::NEED_PREPARE :
{
{
auto res = checkExistingPart();
/// Depending on condition there is no need to execute a merge
if (res == CheckExistingPartResult::PART_EXISTS)
return remove_processed_entry();
}
auto prepare_result = prepare();
part_log_writer = prepare_result.part_log_writer;
/// Avoid rescheduling, execute fetch here, in the same thread.
if (!prepare_result.prepared_successfully)
return execute_fetch(prepare_result.need_to_check_missing_part_in_fetch);
state = State::NEED_EXECUTE_INNER_MERGE;
return true;
}
case State::NEED_EXECUTE_INNER_MERGE :
{
try
{
if (!executeInnerTask())
{
state = State::NEED_FINALIZE;
return true;
}
}
catch (...)
{
if (part_log_writer)
part_log_writer(ExecutionStatus::fromCurrentException("", true));
throw;
}
return true;
}
case State::NEED_FINALIZE :
{
try
{
if (!finalize(part_log_writer))
return execute_fetch(/* need_to_check_missing = */true);
}
catch (...)
{
if (part_log_writer)
part_log_writer(ExecutionStatus::fromCurrentException("", true));
throw;
}
return remove_processed_entry();
}
case State::SUCCESS :
{
throw Exception(ErrorCodes::LOGICAL_ERROR, "Do not call execute on previously succeeded task");
}
}
return false;
}
ReplicatedMergeMutateTaskBase::CheckExistingPartResult ReplicatedMergeMutateTaskBase::checkExistingPart()
{
/// If we already have this part or a part covering it, we do not need to do anything.
/// The part may be still in the PreActive -> Active transition so we first search
/// among PreActive parts to definitely find the desired part if it exists.
MergeTreeData::DataPartPtr existing_part = storage.getPartIfExists(entry.new_part_name, {MergeTreeDataPartState::PreActive});
if (!existing_part)
existing_part = storage.getActiveContainingPart(entry.new_part_name);
/// Even if the part is local, it (in exceptional cases) may not be in ZooKeeper. Let's check that it is there.
if (existing_part && storage.getZooKeeper()->exists(fs::path(storage.replica_path) / "parts" / existing_part->name))
{
LOG_DEBUG(log, "Skipping action for part {} because part {} already exists.", entry.new_part_name, existing_part->name);
/// We will exit from all the execution process
return CheckExistingPartResult::PART_EXISTS;
}
return CheckExistingPartResult::OK;
}
}
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