87 lines
3.5 KiB
C++
87 lines
3.5 KiB
C++
/*
|
|
* MoveKeys.h
|
|
*
|
|
* This source file is part of the FoundationDB open source project
|
|
*
|
|
* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#ifndef FDBSERVER_MOVEKEYS_H
|
|
#define FDBSERVER_MOVEKEYS_H
|
|
#pragma once
|
|
|
|
#include "fdbclient/NativeAPI.h"
|
|
#include "fdbclient/CommitTransaction.h"
|
|
#include "fdbclient/KeyRangeMap.h"
|
|
#include "MasterInterface.h"
|
|
|
|
struct MoveKeysLock {
|
|
UID prevOwner, myOwner, prevWrite;
|
|
template <class Ar>
|
|
void serialize(Ar& ar) { ar & prevOwner & myOwner & prevWrite; }
|
|
};
|
|
|
|
Future<MoveKeysLock> takeMoveKeysLock( Database const& cx, UID const& masterId );
|
|
// Calling moveKeys, etc with the return value of this actor ensures that no movekeys, etc
|
|
// has been executed by a different locker since takeMoveKeysLock().
|
|
// takeMoveKeysLock itself is a read-only operation - it does not conflict with other
|
|
// attempts to take the lock.
|
|
|
|
Future<Void> checkMoveKeysLockReadOnly( Transaction* tr, MoveKeysLock lock );
|
|
// Checks that the a moveKeysLock has not changed since having taken it
|
|
// This does not modify the moveKeysLock
|
|
|
|
void seedShardServers(
|
|
Arena& trArena,
|
|
CommitTransactionRef &tr,
|
|
vector<StorageServerInterface> servers );
|
|
// Called by the master server to write the very first transaction to the database
|
|
// establishing a set of shard servers and all invariants of the systemKeys.
|
|
|
|
Future<Void> moveKeys(
|
|
Database const& occ,
|
|
KeyRange const& keys,
|
|
vector<UID> const& destinationTeam,
|
|
MoveKeysLock const& lock,
|
|
int const& durableStorageQuorum,
|
|
Promise<Void> const& dataMovementComplete,
|
|
FlowLock* const& startMoveKeysParallelismLock,
|
|
FlowLock* const& finishMoveKeysParallelismLock,
|
|
UID const& relocationIntervalId); // for logging only
|
|
// Eventually moves the given keys to the given destination team
|
|
// Caller is responsible for cancelling it before issuing an overlapping move,
|
|
// for restarting the remainder, and for not otherwise cancelling it before
|
|
// it returns (since it needs to execute the finishMoveKeys transaction).
|
|
|
|
Future<std::pair<Version,Tag>> addStorageServer(
|
|
Database const& cx,
|
|
StorageServerInterface const& server );
|
|
// Adds a newly recruited storage server to a database (e.g. adding it to FF/serverList)
|
|
// Returns a Version in which the storage server is in the database
|
|
// This doesn't need to be called for the "seed" storage servers (see seedShardServers above)
|
|
|
|
Future<Void> removeStorageServer(
|
|
Database const& cx,
|
|
UID const& serverID,
|
|
MoveKeysLock const& lock );
|
|
// Removes the given storage server permanently from the database. It must already
|
|
// have no shards assigned to it. The storage server MUST NOT be added again after this
|
|
// (though a new storage server with a new unique ID may be recruited from the same fdbserver).
|
|
|
|
Future<bool> canRemoveStorageServer( Transaction* const& tr, UID const& serverID );
|
|
// Returns true if the given storage server has no keys assigned to it and may be safely removed
|
|
// Obviously that could change later!
|
|
|
|
#endif |