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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/document/bucket/bucketid.h>
#include <vespa/document/base/globalid.h>
#include <vespa/persistence/spi/types.h>
#include <atomic>
namespace vespalib { class IDestructorCallback; }
namespace proton {
struct IDocumentMoveHandler;
struct IMoveOperationLimiter;
class MaintenanceDocumentSubDB;
class MoveOperation;
namespace bucketdb {
class BucketDBOwner;
/**
* Class used to move all documents in a bucket from a source sub database
* to a target sub database. The actual moving is handled by a given instance
* of IDocumentMoveHandler.
*/
class BucketMover : public std::enable_shared_from_this<BucketMover>
{
public:
using MoveOperationUP = std::unique_ptr<MoveOperation>;
using IDestructorCallback = vespalib::IDestructorCallback;
using IDestructorCallbackSP = std::shared_ptr<IDestructorCallback>;
class MoveGuard {
public:
MoveGuard() noexcept : _mover(nullptr) {}
MoveGuard(BucketMover & mover) noexcept
: _mover(&mover)
{
_mover->_started.fetch_add(1, std::memory_order_relaxed);
}
MoveGuard(MoveGuard && rhs) noexcept : _mover(rhs._mover) { rhs._mover = nullptr; }
MoveGuard & operator = (MoveGuard && mover) = delete;
MoveGuard(const MoveGuard & rhs) = delete;
MoveGuard & operator = (const MoveGuard & mover) = delete;
~MoveGuard() {
if (_mover) {
_mover->_completed.fetch_add(1, std::memory_order_relaxed);
}
}
private:
BucketMover *_mover;
};
struct MoveKey
{
using Timestamp = storage::spi::Timestamp;
MoveKey(uint32_t lid, const document::GlobalId &gid, Timestamp timestamp, MoveGuard guard) noexcept;
MoveKey(MoveKey &&) noexcept = default;
~MoveKey();
uint32_t _lid;
document::GlobalId _gid;
Timestamp _timestamp;
MoveGuard _guard;
};
using GuardedMoveOp = std::pair<MoveOperationUP, MoveGuard>;
class GuardedMoveOps {
public:
GuardedMoveOps(std::shared_ptr<BucketMover> mover) noexcept;
GuardedMoveOps(GuardedMoveOps &&) = default;
GuardedMoveOps & operator =(GuardedMoveOps &&) = default;
GuardedMoveOps(const GuardedMoveOps &) = delete;
GuardedMoveOps & operator = (const GuardedMoveOps &) = delete;
~GuardedMoveOps();
std::vector<GuardedMoveOp> & success() { return _success; }
std::vector<MoveGuard> & failed() { return _failed; }
BucketMover & mover() { return *_mover; }
private:
// It is important to keep the order so the mover is destructed last
std::shared_ptr<BucketMover> _mover;
std::vector<GuardedMoveOp> _success;
std::vector<MoveGuard> _failed;
};
class MoveKeys {
public:
MoveKeys(std::shared_ptr<BucketMover> mover) noexcept : _mover(std::move(mover)) {}
MoveKeys(MoveKeys &&) noexcept = default;
MoveKeys & operator =(MoveKeys &&) noexcept = default;
MoveKeys(const MoveKeys &) noexcept = delete;
MoveKeys & operator =(const MoveKeys &) noexcept = delete;
~MoveKeys();
GuardedMoveOps createMoveOperations();
std::shared_ptr<BucketMover> stealMover();
std::vector<MoveKey> & keys() { return _keys; }
size_t size() const { return _keys.size(); }
bool empty() const { return _keys.empty(); }
const MoveKey & back() const { return _keys.back(); }
const BucketMover & mover() const { return *_mover; }
private:
// It is important to keep the order so the mover is destructed last
std::shared_ptr<BucketMover> _mover;
std::vector<MoveKey> _keys;
};
static std::shared_ptr<BucketMover>
create(const document::BucketId &bucket, const MaintenanceDocumentSubDB *source,
uint32_t targetSubDbId, IDocumentMoveHandler &handler);
BucketMover(BucketMover &&) noexcept = delete;
BucketMover & operator=(BucketMover &&) noexcept = delete;
BucketMover(const BucketMover &) = delete;
BucketMover & operator=(const BucketMover &) = delete;
~BucketMover();
/// Must be called in master thread
std::pair<MoveKeys, bool> getKeysToMove(size_t maxDocsToMove);
/// Call from any thread
GuardedMoveOps createMoveOperations(MoveKeys toMove);
/// Must be called in master thread
void moveDocuments(std::vector<GuardedMoveOp> moveOps, IDestructorCallbackSP onDone);
void moveDocument(MoveOperationUP moveOp, IDestructorCallbackSP onDone);
const document::BucketId &getBucket() const { return _bucket; }
void cancel();
[[nodiscard]] bool cancelled() const noexcept { return _cancelled; }
void setAllScheduled() { _allScheduled = true; }
/// Signals all documents have been scheduled for move
bool allScheduled() const { return _allScheduled; }
bool needReschedule() const { return _needReschedule.load(std::memory_order_relaxed); }
const MaintenanceDocumentSubDB * getSource() const { return _source; }
/// Must be called in master thread
void updateLastValidGid(const document::GlobalId &gid) {
_lastGid = gid;
_lastGidValid = true;
}
bool inSync() const {
return pending() == 0;
}
private:
BucketMover(const document::BucketId &bucket, const MaintenanceDocumentSubDB *source,
uint32_t targetSubDbId, IDocumentMoveHandler &handler) noexcept;
const MaintenanceDocumentSubDB *_source;
IDocumentMoveHandler *_handler;
const document::BucketId _bucket;
const uint32_t _targetSubDbId;
std::atomic<uint32_t> _started;
std::atomic<uint32_t> _completed;
std::atomic<bool> _needReschedule;
bool _cancelled;
bool _allScheduled; // All moves started, or operation has been cancelled
bool _lastGidValid;
document::GlobalId _lastGid;
MoveOperationUP createMoveOperation(const MoveKey & key);
size_t pending() const {
return _started.load(std::memory_order_relaxed) - _completed.load(std::memory_order_relaxed);
}
};
}
/**
* Class used to move all documents in a bucket from a source sub database
* to a target sub database. The actual moving is handled by a given instance
* of IDocumentMoveHandler.
*/
class DocumentBucketMover
{
private:
IMoveOperationLimiter &_limiter;
bucketdb::BucketDBOwner *_bucketDb;
std::shared_ptr<bucketdb::BucketMover> _impl;
bool moveDocuments(size_t maxDocsToMove, IMoveOperationLimiter &limiter);
public:
DocumentBucketMover(IMoveOperationLimiter &limiter, bucketdb::BucketDBOwner &bucketDb) noexcept;
DocumentBucketMover(DocumentBucketMover &&) noexcept = default;
DocumentBucketMover & operator=(DocumentBucketMover &&) noexcept = delete;
DocumentBucketMover(const DocumentBucketMover &) = delete;
DocumentBucketMover & operator=(const DocumentBucketMover &) = delete;
void setupForBucket(const document::BucketId &bucket,
const MaintenanceDocumentSubDB *source,
uint32_t targetSubDbId,
IDocumentMoveHandler &handler);
const document::BucketId &getBucket() const { return _impl->getBucket(); }
bool moveDocuments(size_t maxDocsToMove);
void cancel() { _impl->cancel(); }
bool needReschedule() { return _impl && _impl->needReschedule(); }
bool bucketDone() const {
return !_impl || _impl->allScheduled();
}
const MaintenanceDocumentSubDB * getSource() const { return _impl->getSource(); }
};
} // namespace proton
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