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Don't hold shared_ptr to zookeeper for long time, because it makes very difficult to remove ephemeral nodes in case of temporary communication errors and thus breaks leader election [#METR-23272].
This commit is contained in:
Alexey Milovidov
parent
6e49241120
commit
2dd43be6e6
@ -157,7 +157,7 @@ public:
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* Если в процессе обработки было исключение - сохраняет его в entry.
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* Возвращает true, если в процессе обработки не было исключений.
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*/
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bool processEntry(zkutil::ZooKeeperPtr zookeeper, LogEntryPtr & entry, const std::function<bool(LogEntryPtr &)> func);
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bool processEntry(std::function<zkutil::ZooKeeperPtr()> get_zookeeper, LogEntryPtr & entry, const std::function<bool(LogEntryPtr &)> func);
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/// Будет ли кусок в будущем слит в более крупный (или мерджи кусков в данном диапазоне запрещены)?
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bool partWillBeMergedOrMergesDisabled(const String & part_name) const;
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@ -577,14 +577,17 @@ ReplicatedMergeTreeQueue::SelectedEntry ReplicatedMergeTreeQueue::selectEntryToP
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}
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bool ReplicatedMergeTreeQueue::processEntry(zkutil::ZooKeeperPtr zookeeper, LogEntryPtr & entry, const std::function<bool(LogEntryPtr &)> func)
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bool ReplicatedMergeTreeQueue::processEntry(
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std::function<zkutil::ZooKeeperPtr()> get_zookeeper,
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LogEntryPtr & entry,
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const std::function<bool(LogEntryPtr &)> func)
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{
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std::exception_ptr saved_exception;
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try
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{
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if (func(entry))
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remove(zookeeper, entry);
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remove(get_zookeeper(), entry);
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}
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catch (...)
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{
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@ -1037,8 +1037,6 @@ void StorageReplicatedMergeTree::pullLogsToQueue(zkutil::EventPtr next_update_ev
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bool StorageReplicatedMergeTree::executeLogEntry(const LogEntry & entry, BackgroundProcessingPool::Context & pool_context)
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{
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auto zookeeper = getZooKeeper();
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if (entry.type == LogEntry::DROP_RANGE)
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{
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executeDropRange(entry);
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@ -1053,7 +1051,7 @@ bool StorageReplicatedMergeTree::executeLogEntry(const LogEntry & entry, Backgro
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MergeTreeData::DataPartPtr containing_part = data.getActiveContainingPart(entry.new_part_name);
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/// Даже если кусок есть локально, его (в исключительных случаях) может не быть в zookeeper. Проверим, что он там есть.
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if (containing_part && zookeeper->exists(replica_path + "/parts/" + containing_part->name))
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if (containing_part && getZooKeeper()->exists(replica_path + "/parts/" + containing_part->name))
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{
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if (!(entry.type == LogEntry::GET_PART && entry.source_replica == replica_name))
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LOG_DEBUG(log, "Skipping action for part " << entry.new_part_name << " - part already exists.");
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@ -1065,7 +1063,7 @@ bool StorageReplicatedMergeTree::executeLogEntry(const LogEntry & entry, Backgro
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LOG_WARNING(log, "Part " << entry.new_part_name << " from own log doesn't exist.");
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/// Возможно, этот кусок нам не нужен, так как при записи с кворумом, кворум пофейлился (см. ниже про /quorum/failed_parts).
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if (entry.quorum && zookeeper->exists(zookeeper_path + "/quorum/failed_parts/" + entry.new_part_name))
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if (entry.quorum && getZooKeeper()->exists(zookeeper_path + "/quorum/failed_parts/" + entry.new_part_name))
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{
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LOG_DEBUG(log, "Skipping action for part " << entry.new_part_name << " because quorum for that part was failed.");
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return true; /// NOTE Удаление из virtual_parts не делается, но оно нужно только для мерджей.
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@ -1278,6 +1276,8 @@ bool StorageReplicatedMergeTree::executeLogEntry(const LogEntry & entry, Backgro
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* Это позволит проследить, что реплики не стали активными.
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*/
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auto zookeeper = getZooKeeper();
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Strings replicas = zookeeper->getChildren(zookeeper_path + "/replicas");
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zkutil::Ops ops;
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@ -1416,11 +1416,9 @@ bool StorageReplicatedMergeTree::executeLogEntry(const LogEntry & entry, Backgro
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void StorageReplicatedMergeTree::executeDropRange(const StorageReplicatedMergeTree::LogEntry & entry)
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{
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auto zookeeper = getZooKeeper();
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LOG_INFO(log, (entry.detach ? "Detaching" : "Removing") << " parts inside " << entry.new_part_name << ".");
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queue.removeGetsAndMergesInRange(zookeeper, entry.new_part_name);
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queue.removeGetsAndMergesInRange(getZooKeeper(), entry.new_part_name);
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LOG_DEBUG(log, (entry.detach ? "Detaching" : "Removing") << " parts.");
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size_t removed_parts = 0;
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@ -1445,7 +1443,7 @@ void StorageReplicatedMergeTree::executeDropRange(const StorageReplicatedMergeTr
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zkutil::Ops ops;
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removePartFromZooKeeper(part->name, ops);
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auto code = zookeeper->tryMulti(ops);
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auto code = getZooKeeper()->tryMulti(ops);
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/// Если кусок уже удалён (например, потому что он так и не был добавлен в ZK из-за сбоя,
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/// см. ReplicatedMergeTreeBlockOutputStream), то всё Ок.
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@ -1463,8 +1461,6 @@ void StorageReplicatedMergeTree::executeDropRange(const StorageReplicatedMergeTr
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bool StorageReplicatedMergeTree::executeAttachPart(const StorageReplicatedMergeTree::LogEntry & entry)
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{
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auto zookeeper = getZooKeeper();
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String source_path = (entry.attach_unreplicated ? "unreplicated/" : "detached/") + entry.source_part_name;
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LOG_INFO(log, "Attaching part " << entry.source_part_name << " from " << source_path << " as " << entry.new_part_name);
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@ -1490,7 +1486,7 @@ bool StorageReplicatedMergeTree::executeAttachPart(const StorageReplicatedMergeT
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LOG_WARNING(log, "Unreplicated part " << entry.source_part_name << " is already detached");
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}
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zookeeper->multi(ops);
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getZooKeeper()->multi(ops);
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/// NOTE: Не можем использовать renameTempPartAndAdd, потому что кусок не временный - если что-то пойдет не так, его не нужно удалять.
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part->renameTo(entry.new_part_name);
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@ -1559,7 +1555,7 @@ bool StorageReplicatedMergeTree::queueTask(BackgroundProcessingPool::Context & p
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time_t prev_attempt_time = entry->last_attempt_time;
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bool res = queue.processEntry(getZooKeeper(), entry, [&](LogEntryPtr & entry)
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bool res = queue.processEntry([this]{ return getZooKeeper(); }, entry, [&](LogEntryPtr & entry)
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{
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try
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{
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@ -2054,15 +2050,13 @@ bool StorageReplicatedMergeTree::fetchPart(const String & part_name, const Strin
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currently_fetching_parts.erase(part_name);
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);
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auto zookeeper = getZooKeeper();
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LOG_DEBUG(log, "Fetching part " << part_name << " from " << replica_path);
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TableStructureReadLockPtr table_lock;
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if (!to_detached)
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table_lock = lockStructure(true);
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ReplicatedMergeTreeAddress address(zookeeper->get(replica_path + "/host"));
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ReplicatedMergeTreeAddress address(getZooKeeper()->get(replica_path + "/host"));
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MergeTreeData::MutableDataPartPtr part = fetcher.fetchPart(
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part_name, replica_path, address.host, address.replication_port, to_detached);
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@ -2081,7 +2075,7 @@ bool StorageReplicatedMergeTree::fetchPart(const String & part_name, const Strin
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MergeTreeData::Transaction transaction;
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auto removed_parts = data.renameTempPartAndReplace(part, nullptr, &transaction);
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zookeeper->multi(ops);
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getZooKeeper()->multi(ops);
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transaction.commit();
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/** Если для этого куска отслеживается кворум, то надо его обновить.
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@ -2342,8 +2336,6 @@ bool StorageReplicatedMergeTree::optimize(const String & partition, bool final,
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assertNotReadonly();
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auto zookeeper = getZooKeeper();
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if (!is_leader_node)
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throw Exception("Method OPTIMIZE for ReplicatedMergeTree could be called only on leader replica", ErrorCodes::NOT_IMPLEMENTED);
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@ -2394,7 +2386,6 @@ void StorageReplicatedMergeTree::alter(const AlterCommands & params,
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{
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assertNotReadonly();
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auto zookeeper = getZooKeeper();
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auto merge_blocker = merger.cancel();
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auto unreplicated_merge_blocker = unreplicated_merger ?
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unreplicated_merger->cancel() : MergeTreeDataMerger::Blocker();
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@ -2433,7 +2424,7 @@ void StorageReplicatedMergeTree::alter(const AlterCommands & params,
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}.toString();
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/// Делаем ALTER.
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zookeeper->set(zookeeper_path + "/columns", new_columns_str, -1, &stat);
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getZooKeeper()->set(zookeeper_path + "/columns", new_columns_str, -1, &stat);
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new_columns_version = stat.version;
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}
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@ -2443,7 +2434,7 @@ void StorageReplicatedMergeTree::alter(const AlterCommands & params,
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/// Ждем, пока все реплики обновят данные.
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/// Подпишемся на изменения столбцов, чтобы перестать ждать, если кто-то еще сделает ALTER.
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if (!zookeeper->exists(zookeeper_path + "/columns", &stat, alter_query_event))
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if (!getZooKeeper()->exists(zookeeper_path + "/columns", &stat, alter_query_event))
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throw Exception(zookeeper_path + "/columns doesn't exist", ErrorCodes::NOT_FOUND_NODE);
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if (stat.version != new_columns_version)
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@ -2453,7 +2444,7 @@ void StorageReplicatedMergeTree::alter(const AlterCommands & params,
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return;
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}
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Strings replicas = zookeeper->getChildren(zookeeper_path + "/replicas");
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Strings replicas = getZooKeeper()->getChildren(zookeeper_path + "/replicas");
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std::set<String> inactive_replicas;
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std::set<String> timed_out_replicas;
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@ -2467,7 +2458,7 @@ void StorageReplicatedMergeTree::alter(const AlterCommands & params,
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while (!shutdown_called)
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{
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/// Реплика может быть неактивной.
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if (!zookeeper->exists(zookeeper_path + "/replicas/" + replica + "/is_active"))
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if (!getZooKeeper()->exists(zookeeper_path + "/replicas/" + replica + "/is_active"))
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{
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LOG_WARNING(log, "Replica " << replica << " is not active during ALTER query."
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" ALTER will be done asynchronously when replica becomes active.");
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@ -2479,7 +2470,7 @@ void StorageReplicatedMergeTree::alter(const AlterCommands & params,
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String replica_columns_str;
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/// Реплику могли успеть удалить.
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if (!zookeeper->tryGet(zookeeper_path + "/replicas/" + replica + "/columns", replica_columns_str, &stat))
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if (!getZooKeeper()->tryGet(zookeeper_path + "/replicas/" + replica + "/columns", replica_columns_str, &stat))
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{
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LOG_WARNING(log, replica << " was removed");
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break;
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@ -2490,7 +2481,7 @@ void StorageReplicatedMergeTree::alter(const AlterCommands & params,
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if (replica_columns_str == new_columns_str)
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break;
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if (!zookeeper->exists(zookeeper_path + "/columns", &stat))
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if (!getZooKeeper()->exists(zookeeper_path + "/columns", &stat))
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throw Exception(zookeeper_path + "/columns doesn't exist", ErrorCodes::NOT_FOUND_NODE);
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if (stat.version != new_columns_version)
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@ -2500,7 +2491,7 @@ void StorageReplicatedMergeTree::alter(const AlterCommands & params,
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return;
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}
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if (!zookeeper->exists(zookeeper_path + "/replicas/" + replica + "/columns", &stat, alter_query_event))
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if (!getZooKeeper()->exists(zookeeper_path + "/replicas/" + replica + "/columns", &stat, alter_query_event))
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{
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LOG_WARNING(log, replica << " was removed");
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break;
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@ -2625,24 +2616,23 @@ void StorageReplicatedMergeTree::dropPartition(
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assertNotReadonly();
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auto zookeeper = getZooKeeper();
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String month_name = MergeTreeData::getMonthName(field);
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if (!is_leader_node)
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{
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/// Проксируем запрос в лидера.
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auto live_replicas = zookeeper->getChildren(zookeeper_path + "/leader_election");
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auto live_replicas = getZooKeeper()->getChildren(zookeeper_path + "/leader_election");
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if (live_replicas.empty())
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throw Exception("No active replicas", ErrorCodes::NO_ACTIVE_REPLICAS);
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std::sort(live_replicas.begin(), live_replicas.end());
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const auto leader = zookeeper->get(zookeeper_path + "/leader_election/" + live_replicas.front());
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const auto leader = getZooKeeper()->get(zookeeper_path + "/leader_election/" + live_replicas.front());
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if (leader == replica_name)
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throw Exception("Leader was suddenly changed or logical error.", ErrorCodes::LEADERSHIP_CHANGED);
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ReplicatedMergeTreeAddress leader_address(zookeeper->get(zookeeper_path + "/replicas/" + leader + "/host"));
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ReplicatedMergeTreeAddress leader_address(getZooKeeper()->get(zookeeper_path + "/replicas/" + leader + "/host"));
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auto new_query = query->clone();
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auto & alter = typeid_cast<ASTAlterQuery &>(*new_query);
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@ -2708,7 +2698,7 @@ void StorageReplicatedMergeTree::dropPartition(
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entry.source_replica = replica_name;
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entry.new_part_name = fake_part_name;
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entry.detach = detach;
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String log_znode_path = zookeeper->create(zookeeper_path + "/log/log-", entry.toString(), zkutil::CreateMode::PersistentSequential);
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String log_znode_path = getZooKeeper()->create(zookeeper_path + "/log/log-", entry.toString(), zkutil::CreateMode::PersistentSequential);
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entry.znode_name = log_znode_path.substr(log_znode_path.find_last_of('/') + 1);
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entry.create_time = time(0);
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@ -2727,7 +2717,6 @@ void StorageReplicatedMergeTree::attachPartition(ASTPtr query, const Field & fie
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{
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assertNotReadonly();
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auto zookeeper = getZooKeeper();
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String partition;
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if (attach_part)
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@ -2812,12 +2801,12 @@ void StorageReplicatedMergeTree::attachPartition(ASTPtr query, const Field & fie
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entry.create_time = time(0);
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ops.push_back(new zkutil::Op::Create(
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zookeeper_path + "/log/log-", entry.toString(), zookeeper->getDefaultACL(), zkutil::CreateMode::PersistentSequential));
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zookeeper_path + "/log/log-", entry.toString(), getZooKeeper()->getDefaultACL(), zkutil::CreateMode::PersistentSequential));
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}
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LOG_DEBUG(log, "Adding attaches to log");
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zookeeper->multi(ops);
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getZooKeeper()->multi(ops);
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/// Если надо - дожидаемся выполнения операции на себе или на всех репликах.
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if (settings.replication_alter_partitions_sync != 0)
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@ -2841,26 +2830,28 @@ void StorageReplicatedMergeTree::attachPartition(ASTPtr query, const Field & fie
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void StorageReplicatedMergeTree::drop()
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{
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auto zookeeper = tryGetZooKeeper();
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if (is_readonly || !zookeeper)
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throw Exception("Can't drop readonly replicated table (need to drop data in ZooKeeper as well)", ErrorCodes::TABLE_IS_READ_ONLY);
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shutdown();
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if (zookeeper->expired())
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throw Exception("Table was not dropped because ZooKeeper session has expired.", ErrorCodes::TABLE_WAS_NOT_DROPPED);
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LOG_INFO(log, "Removing replica " << replica_path);
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replica_is_active_node = nullptr;
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zookeeper->tryRemoveRecursive(replica_path);
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/// Проверяем, что zookeeper_path существует: его могла удалить другая реплика после выполнения предыдущей строки.
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Strings replicas;
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if (zookeeper->tryGetChildren(zookeeper_path + "/replicas", replicas) == ZOK && replicas.empty())
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{
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LOG_INFO(log, "Removing table " << zookeeper_path << " (this might take several minutes)");
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zookeeper->tryRemoveRecursive(zookeeper_path);
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auto zookeeper = tryGetZooKeeper();
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if (is_readonly || !zookeeper)
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throw Exception("Can't drop readonly replicated table (need to drop data in ZooKeeper as well)", ErrorCodes::TABLE_IS_READ_ONLY);
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shutdown();
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if (zookeeper->expired())
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throw Exception("Table was not dropped because ZooKeeper session has expired.", ErrorCodes::TABLE_WAS_NOT_DROPPED);
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LOG_INFO(log, "Removing replica " << replica_path);
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replica_is_active_node = nullptr;
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zookeeper->tryRemoveRecursive(replica_path);
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/// Проверяем, что zookeeper_path существует: его могла удалить другая реплика после выполнения предыдущей строки.
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Strings replicas;
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if (zookeeper->tryGetChildren(zookeeper_path + "/replicas", replicas) == ZOK && replicas.empty())
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{
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LOG_INFO(log, "Removing table " << zookeeper_path << " (this might take several minutes)");
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zookeeper->tryRemoveRecursive(zookeeper_path);
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}
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}
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data.dropAllData();
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@ -2891,8 +2882,7 @@ bool StorageReplicatedMergeTree::existsNodeCached(const std::string & path)
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return true;
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}
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auto zookeeper = getZooKeeper();
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bool res = zookeeper->exists(path);
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bool res = getZooKeeper()->exists(path);
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if (res)
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{
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@ -2933,10 +2923,9 @@ AbandonableLockInZooKeeper StorageReplicatedMergeTree::allocateBlockNumber(const
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void StorageReplicatedMergeTree::waitForAllReplicasToProcessLogEntry(const ReplicatedMergeTreeLogEntryData & entry)
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{
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auto zookeeper = getZooKeeper();
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LOG_DEBUG(log, "Waiting for all replicas to process " << entry.znode_name);
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Strings replicas = zookeeper->getChildren(zookeeper_path + "/replicas");
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Strings replicas = getZooKeeper()->getChildren(zookeeper_path + "/replicas");
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for (const String & replica : replicas)
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waitForReplicaToProcessLogEntry(replica, entry);
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@ -2946,8 +2935,6 @@ void StorageReplicatedMergeTree::waitForAllReplicasToProcessLogEntry(const Repli
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void StorageReplicatedMergeTree::waitForReplicaToProcessLogEntry(const String & replica, const ReplicatedMergeTreeLogEntryData & entry)
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{
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auto zookeeper = getZooKeeper();
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String entry_str = entry.toString();
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String log_node_name;
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@ -2982,7 +2969,7 @@ void StorageReplicatedMergeTree::waitForReplicaToProcessLogEntry(const String &
|
||||
{
|
||||
zkutil::EventPtr event = std::make_shared<Poco::Event>();
|
||||
|
||||
String log_pointer = zookeeper->get(zookeeper_path + "/replicas/" + replica + "/log_pointer", nullptr, event);
|
||||
String log_pointer = getZooKeeper()->get(zookeeper_path + "/replicas/" + replica + "/log_pointer", nullptr, event);
|
||||
if (!log_pointer.empty() && parse<UInt64>(log_pointer) > log_index)
|
||||
break;
|
||||
|
||||
@ -2995,9 +2982,9 @@ void StorageReplicatedMergeTree::waitForReplicaToProcessLogEntry(const String &
|
||||
* ища ноду с таким же содержимым. И если мы её не найдём - значит реплика уже взяла эту запись в свою queue.
|
||||
*/
|
||||
|
||||
String log_pointer = zookeeper->get(zookeeper_path + "/replicas/" + replica + "/log_pointer");
|
||||
String log_pointer = getZooKeeper()->get(zookeeper_path + "/replicas/" + replica + "/log_pointer");
|
||||
|
||||
Strings log_entries = zookeeper->getChildren(zookeeper_path + "/log");
|
||||
Strings log_entries = getZooKeeper()->getChildren(zookeeper_path + "/log");
|
||||
UInt64 log_index = 0;
|
||||
bool found = false;
|
||||
|
||||
@ -3009,7 +2996,7 @@ void StorageReplicatedMergeTree::waitForReplicaToProcessLogEntry(const String &
|
||||
continue;
|
||||
|
||||
String log_entry_str;
|
||||
bool exists = zookeeper->tryGet(zookeeper_path + "/log/" + log_entry_name, log_entry_str);
|
||||
bool exists = getZooKeeper()->tryGet(zookeeper_path + "/log/" + log_entry_name, log_entry_str);
|
||||
if (exists && entry_str == log_entry_str)
|
||||
{
|
||||
found = true;
|
||||
@ -3027,7 +3014,7 @@ void StorageReplicatedMergeTree::waitForReplicaToProcessLogEntry(const String &
|
||||
{
|
||||
zkutil::EventPtr event = std::make_shared<Poco::Event>();
|
||||
|
||||
String log_pointer = zookeeper->get(zookeeper_path + "/replicas/" + replica + "/log_pointer", nullptr, event);
|
||||
String log_pointer = getZooKeeper()->get(zookeeper_path + "/replicas/" + replica + "/log_pointer", nullptr, event);
|
||||
if (!log_pointer.empty() && parse<UInt64>(log_pointer) > log_index)
|
||||
break;
|
||||
|
||||
@ -3048,13 +3035,13 @@ void StorageReplicatedMergeTree::waitForReplicaToProcessLogEntry(const String &
|
||||
* Поэтому, ищем путём сравнения содержимого.
|
||||
*/
|
||||
|
||||
Strings queue_entries = zookeeper->getChildren(zookeeper_path + "/replicas/" + replica + "/queue");
|
||||
Strings queue_entries = getZooKeeper()->getChildren(zookeeper_path + "/replicas/" + replica + "/queue");
|
||||
String queue_entry_to_wait_for;
|
||||
|
||||
for (const String & entry_name : queue_entries)
|
||||
{
|
||||
String queue_entry_str;
|
||||
bool exists = zookeeper->tryGet(zookeeper_path + "/replicas/" + replica + "/queue/" + entry_name, queue_entry_str);
|
||||
bool exists = getZooKeeper()->tryGet(zookeeper_path + "/replicas/" + replica + "/queue/" + entry_name, queue_entry_str);
|
||||
if (exists && queue_entry_str == entry_str)
|
||||
{
|
||||
queue_entry_to_wait_for = entry_name;
|
||||
@ -3072,7 +3059,7 @@ void StorageReplicatedMergeTree::waitForReplicaToProcessLogEntry(const String &
|
||||
LOG_DEBUG(log, "Waiting for " << queue_entry_to_wait_for << " to disappear from " << replica << " queue");
|
||||
|
||||
/// Третье - дождемся, пока запись исчезнет из очереди реплики.
|
||||
zookeeper->waitForDisappear(zookeeper_path + "/replicas/" + replica + "/queue/" + queue_entry_to_wait_for);
|
||||
getZooKeeper()->waitForDisappear(zookeeper_path + "/replicas/" + replica + "/queue/" + queue_entry_to_wait_for);
|
||||
}
|
||||
|
||||
|
||||
@ -3209,8 +3196,6 @@ void StorageReplicatedMergeTree::getReplicaDelays(time_t & out_absolute_delay, t
|
||||
|
||||
void StorageReplicatedMergeTree::fetchPartition(const Field & partition, const String & from_, const Settings & settings)
|
||||
{
|
||||
auto zookeeper = getZooKeeper();
|
||||
|
||||
String partition_str = MergeTreeData::getMonthName(partition);
|
||||
|
||||
String from = from_;
|
||||
@ -3227,47 +3212,53 @@ void StorageReplicatedMergeTree::fetchPartition(const Field & partition, const S
|
||||
if (startsWith(dir_it.name(), partition_str))
|
||||
throw Exception("Detached partition " + partition_str + " already exists.", ErrorCodes::PARTITION_ALREADY_EXISTS);
|
||||
|
||||
/// Список реплик шарда-источника.
|
||||
zkutil::Strings replicas = zookeeper->getChildren(from + "/replicas");
|
||||
|
||||
/// Оставим только активные реплики.
|
||||
zkutil::Strings replicas;
|
||||
zkutil::Strings active_replicas;
|
||||
active_replicas.reserve(replicas.size());
|
||||
|
||||
for (const String & replica : replicas)
|
||||
if (zookeeper->exists(from + "/replicas/" + replica + "/is_active"))
|
||||
active_replicas.push_back(replica);
|
||||
|
||||
if (active_replicas.empty())
|
||||
throw Exception("No active replicas for shard " + from, ErrorCodes::NO_ACTIVE_REPLICAS);
|
||||
|
||||
/** Надо выбрать лучшую (наиболее актуальную) реплику.
|
||||
* Это реплика с максимальным log_pointer, затем с минимальным размером queue.
|
||||
* NOTE Это не совсем лучший критерий. Для скачивания старых партиций это не имеет смысла,
|
||||
* и было бы неплохо уметь выбирать реплику, ближайшую по сети.
|
||||
* NOTE Разумеется, здесь есть data race-ы. Можно решить ретраями.
|
||||
*/
|
||||
Int64 max_log_pointer = -1;
|
||||
UInt64 min_queue_size = std::numeric_limits<UInt64>::max();
|
||||
String best_replica;
|
||||
|
||||
for (const String & replica : active_replicas)
|
||||
{
|
||||
String current_replica_path = from + "/replicas/" + replica;
|
||||
auto zookeeper = getZooKeeper();
|
||||
|
||||
String log_pointer_str = zookeeper->get(current_replica_path + "/log_pointer");
|
||||
Int64 log_pointer = log_pointer_str.empty() ? 0 : parse<UInt64>(log_pointer_str);
|
||||
/// Список реплик шарда-источника.
|
||||
replicas = zookeeper->getChildren(from + "/replicas");
|
||||
|
||||
zkutil::Stat stat;
|
||||
zookeeper->get(current_replica_path + "/queue", &stat);
|
||||
size_t queue_size = stat.numChildren;
|
||||
/// Оставим только активные реплики.
|
||||
active_replicas.reserve(replicas.size());
|
||||
|
||||
if (log_pointer > max_log_pointer
|
||||
|| (log_pointer == max_log_pointer && queue_size < min_queue_size))
|
||||
for (const String & replica : replicas)
|
||||
if (zookeeper->exists(from + "/replicas/" + replica + "/is_active"))
|
||||
active_replicas.push_back(replica);
|
||||
|
||||
if (active_replicas.empty())
|
||||
throw Exception("No active replicas for shard " + from, ErrorCodes::NO_ACTIVE_REPLICAS);
|
||||
|
||||
/** Надо выбрать лучшую (наиболее актуальную) реплику.
|
||||
* Это реплика с максимальным log_pointer, затем с минимальным размером queue.
|
||||
* NOTE Это не совсем лучший критерий. Для скачивания старых партиций это не имеет смысла,
|
||||
* и было бы неплохо уметь выбирать реплику, ближайшую по сети.
|
||||
* NOTE Разумеется, здесь есть data race-ы. Можно решить ретраями.
|
||||
*/
|
||||
Int64 max_log_pointer = -1;
|
||||
UInt64 min_queue_size = std::numeric_limits<UInt64>::max();
|
||||
|
||||
for (const String & replica : active_replicas)
|
||||
{
|
||||
max_log_pointer = log_pointer;
|
||||
min_queue_size = queue_size;
|
||||
best_replica = replica;
|
||||
String current_replica_path = from + "/replicas/" + replica;
|
||||
|
||||
String log_pointer_str = zookeeper->get(current_replica_path + "/log_pointer");
|
||||
Int64 log_pointer = log_pointer_str.empty() ? 0 : parse<UInt64>(log_pointer_str);
|
||||
|
||||
zkutil::Stat stat;
|
||||
zookeeper->get(current_replica_path + "/queue", &stat);
|
||||
size_t queue_size = stat.numChildren;
|
||||
|
||||
if (log_pointer > max_log_pointer
|
||||
|| (log_pointer == max_log_pointer && queue_size < min_queue_size))
|
||||
{
|
||||
max_log_pointer = log_pointer;
|
||||
min_queue_size = queue_size;
|
||||
best_replica = replica;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@ -3296,7 +3287,7 @@ void StorageReplicatedMergeTree::fetchPartition(const Field & partition, const S
|
||||
if (try_no >= 5)
|
||||
throw Exception("Too much retries to fetch parts from " + best_replica_path, ErrorCodes::TOO_MUCH_RETRIES_TO_FETCH_PARTS);
|
||||
|
||||
Strings parts = zookeeper->getChildren(best_replica_path + "/parts");
|
||||
Strings parts = getZooKeeper()->getChildren(best_replica_path + "/parts");
|
||||
ActiveDataPartSet active_parts_set(parts);
|
||||
Strings parts_to_fetch;
|
||||
|
||||
@ -3683,9 +3674,10 @@ StorageReplicatedMergeTree::gatherReplicaSpaceInfo(const WeightedZooKeeperPaths
|
||||
local_space_info.factor = 1.1;
|
||||
local_space_info.available_size = DiskSpaceMonitor::getUnreservedFreeSpace(full_path);
|
||||
|
||||
auto zookeeper = getZooKeeper();
|
||||
for (const auto & weighted_path : weighted_zookeeper_paths)
|
||||
{
|
||||
auto zookeeper = getZooKeeper();
|
||||
|
||||
const auto & path = weighted_path.first;
|
||||
UInt64 weight = weighted_path.second;
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user