mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-01 20:12:02 +00:00
237 lines
8.7 KiB
C++
237 lines
8.7 KiB
C++
#pragma once
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#include <map>
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#include <Core/Settings.h>
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#include <Client/ConnectionPool.h>
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#include <Client/ConnectionPoolWithFailover.h>
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#include <Poco/Net/SocketAddress.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int LOGICAL_ERROR;
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}
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/// Cluster contains connection pools to each node
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/// With the local nodes, the connection is not established, but the request is executed directly.
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/// Therefore we store only the number of local nodes
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/// In the config, the cluster includes nodes <node> or <shard>
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class Cluster
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{
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public:
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Cluster(const Poco::Util::AbstractConfiguration & config, const Settings & settings, const String & cluster_name);
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/// Construct a cluster by the names of shards and replicas.
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/// Local are treated as well as remote ones if treat_local_as_remote is true.
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/// 'clickhouse_port' - port that this server instance listen for queries.
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/// This parameter is needed only to check that some address is local (points to ourself).
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Cluster(const Settings & settings, const std::vector<std::vector<String>> & names,
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const String & username, const String & password,
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UInt16 clickhouse_port, bool treat_local_as_remote, bool secure = false);
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Cluster(const Cluster &)= delete;
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Cluster & operator=(const Cluster &) = delete;
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/// is used to set a limit on the size of the timeout
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static Poco::Timespan saturate(const Poco::Timespan & v, const Poco::Timespan & limit);
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public:
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struct Address
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{
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/** In configuration file,
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* addresses are located either in <node> elements:
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* <node>
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* <host>example01-01-1</host>
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* <port>9000</port>
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* <!-- <user>, <password>, <default_database> if needed -->
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* </node>
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* ...
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* or in <shard> and inside in <replica> elements:
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* <shard>
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* <replica>
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* <host>example01-01-1</host>
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* <port>9000</port>
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* <!-- <user>, <password>, <default_database>. <secure> if needed -->
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* </replica>
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* </shard>
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*/
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String host_name;
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UInt16 port;
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String user;
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String password;
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UInt32 shard_index{}; /// shard serial number in configuration file, starting from 1.
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UInt32 replica_index{}; /// replica serial number in this shard, starting from 1; zero means no replicas.
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/// This database is selected when no database is specified for Distributed table
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String default_database;
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/// The locality is determined at the initialization, and is not changed even if DNS is changed
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bool is_local = false;
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bool user_specified = false;
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Protocol::Compression compression = Protocol::Compression::Enable;
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Protocol::Secure secure = Protocol::Secure::Disable;
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Address() = default;
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Address(
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const Poco::Util::AbstractConfiguration & config,
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const String & config_prefix,
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UInt32 shard_index_ = 0,
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UInt32 replica_index_ = 0);
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Address(
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const String & host_port_,
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const String & user_,
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const String & password_,
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UInt16 clickhouse_port,
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bool secure_ = false);
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/// Returns 'escaped_host_name:port'
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String toString() const;
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/// Returns 'host_name:port'
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String readableString() const;
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static String toString(const String & host_name, UInt16 port);
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static std::pair<String, UInt16> fromString(const String & host_port_string);
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/// Returns escaped shard{shard_index}_replica{replica_index} or escaped
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/// user:password@resolved_host_address:resolved_host_port#default_database
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/// depending on use_compact_format flag
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String toFullString(bool use_compact_format) const;
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/// Returns address with only shard index and replica index or full address without shard index and replica index
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static Address fromFullString(const String & address_full_string);
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/// Returns resolved address if it does resolve.
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std::optional<Poco::Net::SocketAddress> getResolvedAddress() const;
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auto tuple() const { return std::tie(host_name, port, secure, user, password, default_database); }
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bool operator==(const Address & other) const { return tuple() == other.tuple(); }
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private:
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bool isLocal(UInt16 clickhouse_port) const;
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};
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using Addresses = std::vector<Address>;
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using AddressesWithFailover = std::vector<Addresses>;
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struct ShardInfo
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{
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public:
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bool isLocal() const { return !local_addresses.empty(); }
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bool hasRemoteConnections() const { return local_addresses.size() != per_replica_pools.size(); }
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size_t getLocalNodeCount() const { return local_addresses.size(); }
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bool hasInternalReplication() const { return has_internal_replication; }
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public:
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/// Name of directory for asynchronous write to StorageDistributed if has_internal_replication
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std::string dir_name_for_internal_replication;
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/// Number of the shard, the indexation begins with 1
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UInt32 shard_num = 0;
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UInt32 weight = 1;
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Addresses local_addresses;
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/// nullptr if there are no remote addresses
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ConnectionPoolWithFailoverPtr pool;
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/// Connection pool for each replica, contains nullptr for local replicas
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ConnectionPoolPtrs per_replica_pools;
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bool has_internal_replication = false;
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};
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using ShardsInfo = std::vector<ShardInfo>;
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String getHashOfAddresses() const { return hash_of_addresses; }
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const ShardsInfo & getShardsInfo() const { return shards_info; }
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const AddressesWithFailover & getShardsAddresses() const { return addresses_with_failover; }
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const ShardInfo & getAnyShardInfo() const
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{
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if (shards_info.empty())
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throw Exception("Cluster is empty", ErrorCodes::LOGICAL_ERROR);
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return shards_info.front();
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}
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/// The number of remote shards.
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size_t getRemoteShardCount() const { return remote_shard_count; }
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/// The number of clickhouse nodes located locally
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/// we access the local nodes directly.
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size_t getLocalShardCount() const { return local_shard_count; }
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/// The number of all shards.
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size_t getShardCount() const { return shards_info.size(); }
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/// Get a subcluster consisting of one shard - index by count (from 0) of the shard of this cluster.
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std::unique_ptr<Cluster> getClusterWithSingleShard(size_t index) const;
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/// Get a subcluster consisting of one or multiple shards - indexes by count (from 0) of the shard of this cluster.
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std::unique_ptr<Cluster> getClusterWithMultipleShards(const std::vector<size_t> & indices) const;
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/// Get a new Cluster that contains all servers (all shards with all replicas) from existing cluster as independent shards.
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std::unique_ptr<Cluster> getClusterWithReplicasAsShards(const Settings & settings) const;
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private:
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using SlotToShard = std::vector<UInt64>;
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SlotToShard slot_to_shard;
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public:
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const SlotToShard & getSlotToShard() const { return slot_to_shard; }
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private:
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void initMisc();
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/// For getClusterWithMultipleShards implementation.
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struct SubclusterTag {};
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Cluster(SubclusterTag, const Cluster & from, const std::vector<size_t> & indices);
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/// For getClusterWithReplicasAsShards implementation
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struct ReplicasAsShardsTag {};
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Cluster(ReplicasAsShardsTag, const Cluster & from, const Settings & settings);
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String hash_of_addresses;
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/// Description of the cluster shards.
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ShardsInfo shards_info;
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/// Any remote shard.
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ShardInfo * any_remote_shard_info = nullptr;
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/// Non-empty is either addresses or addresses_with_failover.
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/// The size and order of the elements in the corresponding array corresponds to shards_info.
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/// An array of shards. For each shard, an array of replica addresses (servers that are considered identical).
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AddressesWithFailover addresses_with_failover;
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size_t remote_shard_count = 0;
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size_t local_shard_count = 0;
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};
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using ClusterPtr = std::shared_ptr<Cluster>;
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class Clusters
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{
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public:
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Clusters(const Poco::Util::AbstractConfiguration & config, const Settings & settings, const String & config_name = "remote_servers");
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Clusters(const Clusters &) = delete;
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Clusters & operator=(const Clusters &) = delete;
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ClusterPtr getCluster(const std::string & cluster_name) const;
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void setCluster(const String & cluster_name, const ClusterPtr & cluster);
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void updateClusters(const Poco::Util::AbstractConfiguration & config, const Settings & settings, const String & config_name);
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public:
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using Impl = std::map<String, ClusterPtr>;
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Impl getContainer() const;
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protected:
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Impl impl;
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mutable std::mutex mutex;
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};
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using ClustersPtr = std::shared_ptr<Clusters>;
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}
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