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#pragma once
#include "ReplicatedMergeTreeMutationEntry.h"
#include <Common/ZooKeeper/ZooKeeper.h>
#include <Common/Exception.h>
#include <IO/ReadHelpers.h>
#include <map>
#include <optional>
namespace DB
{
class ZooKeeperWithFaultInjection;
using ZooKeeperWithFaultInjectionPtr = std::shared_ptr<ZooKeeperWithFaultInjection>;
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
}
/// A class that is used for locking a block number in a partition.
/// Before 22.11 it used to create a secondary ephemeral node in `temp_path` with "abandonable_lock-" prefix
/// and a main ephemeral node with `path_prefix` that references the secondary node. The reasons for this two-level scheme are historical.
/// Since 22.11 it creates single ephemeral node with `path_prefix` that references persistent fake "secondary node".
class EphemeralLockInZooKeeper : public boost::noncopyable
{
template<typename T>
friend std::optional<EphemeralLockInZooKeeper> createEphemeralLockInZooKeeper(
const String & path_prefix_, const String & temp_path, const ZooKeeperWithFaultInjectionPtr & zookeeper_, const T & deduplication_path);
protected:
EphemeralLockInZooKeeper(const String & path_prefix_, const ZooKeeperWithFaultInjectionPtr & zookeeper_, const String & path_, const String & conflict_path_ = "");
public:
EphemeralLockInZooKeeper() = delete;
/// Fake "secondary node" names for blocks with and without "deduplication_path"
static constexpr const char * LEGACY_LOCK_INSERT = "abandonable_lock-insert";
static constexpr const char * LEGACY_LOCK_OTHER = "abandonable_lock-other";
static constexpr const char * LEGACY_LOCK_PREFIX = "/temp/abandonable_lock-";
EphemeralLockInZooKeeper(EphemeralLockInZooKeeper && rhs) noexcept
{
*this = std::move(rhs);
}
EphemeralLockInZooKeeper & operator=(EphemeralLockInZooKeeper && rhs) noexcept
{
zookeeper = rhs.zookeeper;
rhs.zookeeper = nullptr;
path_prefix = std::move(rhs.path_prefix);
path = std::move(rhs.path);
conflict_path = std::move(rhs.conflict_path);
return *this;
}
bool isLocked() const
{
return zookeeper.get();
}
String getPath() const
{
checkCreated();
return path;
}
// In case of async inserts, we try to get locks for multiple inserts and need to know which insert is conflicted.
// That's why we need this function.
String getConflictPath() const
{
return conflict_path;
}
/// Parse the number at the end of the path.
UInt64 getNumber() const
{
checkCreated();
return parse<UInt64>(path.c_str() + path_prefix.size(), path.size() - path_prefix.size());
}
void unlock();
/// Adds actions equivalent to `unlock()` to the list.
/// Returns index of the action that removes
void getUnlockOp(Coordination::Requests & ops);
/// Do not delete nodes in destructor. You may call this method after 'getUnlockOps' and successful execution of these ops,
/// because the nodes will be already deleted.
void assumeUnlocked()
{
zookeeper = nullptr;
}
void checkCreated() const
{
if (!isLocked())
throw Exception(ErrorCodes::LOGICAL_ERROR, "EphemeralLock is not created");
}
~EphemeralLockInZooKeeper();
private:
ZooKeeperWithFaultInjectionPtr zookeeper;
String path_prefix;
String path;
String conflict_path;
};
template<typename T>
std::optional<EphemeralLockInZooKeeper> createEphemeralLockInZooKeeper(
const String & path_prefix_, const String & temp_path, const ZooKeeperWithFaultInjectionPtr & zookeeper_, const T & deduplication_path);
/// Acquires block number locks in all partitions.
class EphemeralLocksInAllPartitions : public boost::noncopyable
{
public:
EphemeralLocksInAllPartitions(
const String & block_numbers_path, const String & path_prefix, const String & temp_path,
zkutil::ZooKeeper & zookeeper_);
EphemeralLocksInAllPartitions() = default;
EphemeralLocksInAllPartitions(EphemeralLocksInAllPartitions && rhs) noexcept
: zookeeper(rhs.zookeeper)
, locks(std::move(rhs.locks))
{
rhs.zookeeper = nullptr;
}
EphemeralLocksInAllPartitions & operator=(EphemeralLocksInAllPartitions && rhs) noexcept
{
zookeeper = rhs.zookeeper;
rhs.zookeeper = nullptr;
locks = std::move(rhs.locks);
return *this;
}
struct LockInfo
{
String path;
String partition_id;
UInt64 number = 0;
};
const std::vector<LockInfo> & getLocks() const { return locks; }
void unlock();
~EphemeralLocksInAllPartitions();
private:
zkutil::ZooKeeper * zookeeper = nullptr;
std::vector<LockInfo> locks;
};
/// This class allows scoped manipulations with block numbers locked in certain partitions
/// See StorageReplicatedMergeTree::allocateBlockNumbersInAffectedPartitions and alter()/mutate() methods
class PartitionBlockNumbersHolder
{
public:
PartitionBlockNumbersHolder(const PartitionBlockNumbersHolder &) = delete;
PartitionBlockNumbersHolder & operator=(const PartitionBlockNumbersHolder &) = delete;
using BlockNumbersType = ReplicatedMergeTreeMutationEntry::BlockNumbersType;
PartitionBlockNumbersHolder() = default;
PartitionBlockNumbersHolder(
BlockNumbersType block_numbers_, std::optional<EphemeralLocksInAllPartitions> locked_block_numbers_holder)
: block_numbers(std::move(block_numbers_))
, multiple_partitions_holder(std::move(locked_block_numbers_holder))
{
}
PartitionBlockNumbersHolder(
BlockNumbersType block_numbers_, std::optional<EphemeralLockInZooKeeper> locked_block_numbers_holder)
: block_numbers(std::move(block_numbers_))
, single_partition_holder(std::move(locked_block_numbers_holder))
{
}
PartitionBlockNumbersHolder & operator=(PartitionBlockNumbersHolder &&) = default;
const BlockNumbersType & getBlockNumbers() const { return block_numbers; }
void reset()
{
multiple_partitions_holder.reset();
single_partition_holder.reset();
block_numbers.clear();
}
private:
BlockNumbersType block_numbers;
std::optional<EphemeralLocksInAllPartitions> multiple_partitions_holder;
std::optional<EphemeralLockInZooKeeper> single_partition_holder;
};
}
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