| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| package org.apache.iotdb.consensus.simple; |
| |
| import org.apache.iotdb.common.rpc.thrift.TEndPoint; |
| import org.apache.iotdb.common.rpc.thrift.TSStatus; |
| import org.apache.iotdb.commons.consensus.ConsensusGroupId; |
| import org.apache.iotdb.commons.consensus.DataRegionId; |
| import org.apache.iotdb.commons.service.metric.PerformanceOverviewMetrics; |
| import org.apache.iotdb.commons.utils.FileUtils; |
| import org.apache.iotdb.commons.utils.StatusUtils; |
| import org.apache.iotdb.consensus.IConsensus; |
| import org.apache.iotdb.consensus.IStateMachine; |
| import org.apache.iotdb.consensus.IStateMachine.Registry; |
| import org.apache.iotdb.consensus.common.DataSet; |
| import org.apache.iotdb.consensus.common.Peer; |
| import org.apache.iotdb.consensus.common.request.IConsensusRequest; |
| import org.apache.iotdb.consensus.config.ConsensusConfig; |
| import org.apache.iotdb.consensus.exception.ConsensusException; |
| import org.apache.iotdb.consensus.exception.ConsensusGroupAlreadyExistException; |
| import org.apache.iotdb.consensus.exception.ConsensusGroupNotExistException; |
| import org.apache.iotdb.consensus.exception.IllegalPeerEndpointException; |
| import org.apache.iotdb.consensus.exception.IllegalPeerNumException; |
| import org.apache.iotdb.consensus.iot.IoTConsensus; |
| import org.apache.iotdb.rpc.TSStatusCode; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.nio.file.DirectoryStream; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Optional; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| /** |
| * A simple consensus implementation, which can be used when replicaNum is 1. |
| * |
| * <p>Notice: The stateMachine needs to implement WAL itself to ensure recovery after a restart |
| */ |
| class SimpleConsensus implements IConsensus { |
| |
| private final Logger logger = LoggerFactory.getLogger(SimpleConsensus.class); |
| |
| private final TEndPoint thisNode; |
| private final int thisNodeId; |
| private final File storageDir; |
| private final IStateMachine.Registry registry; |
| private final Map<ConsensusGroupId, SimpleConsensusServerImpl> stateMachineMap = |
| new ConcurrentHashMap<>(); |
| private static final PerformanceOverviewMetrics PERFORMANCE_OVERVIEW_METRICS = |
| PerformanceOverviewMetrics.getInstance(); |
| |
| public SimpleConsensus(ConsensusConfig config, Registry registry) { |
| this.thisNode = config.getThisNodeEndPoint(); |
| this.thisNodeId = config.getThisNodeId(); |
| this.storageDir = new File(config.getStorageDir()); |
| this.registry = registry; |
| } |
| |
| @Override |
| public synchronized void start() throws IOException { |
| initAndRecover(); |
| } |
| |
| private void initAndRecover() throws IOException { |
| if (!storageDir.exists()) { |
| if (!storageDir.mkdirs()) { |
| throw new IOException(String.format("Unable to create consensus dir at %s", storageDir)); |
| } |
| } else { |
| try (DirectoryStream<Path> stream = Files.newDirectoryStream(storageDir.toPath())) { |
| for (Path path : stream) { |
| String[] items = path.getFileName().toString().split("_"); |
| ConsensusGroupId consensusGroupId = |
| ConsensusGroupId.Factory.create( |
| Integer.parseInt(items[0]), Integer.parseInt(items[1])); |
| SimpleConsensusServerImpl consensus = |
| new SimpleConsensusServerImpl( |
| new Peer(consensusGroupId, thisNodeId, thisNode), |
| registry.apply(consensusGroupId)); |
| stateMachineMap.put(consensusGroupId, consensus); |
| consensus.start(); |
| } |
| } |
| } |
| } |
| |
| @Override |
| public synchronized void stop() throws IOException { |
| stateMachineMap.values().parallelStream().forEach(SimpleConsensusServerImpl::stop); |
| } |
| |
| @Override |
| public TSStatus write(ConsensusGroupId groupId, IConsensusRequest request) |
| throws ConsensusException { |
| SimpleConsensusServerImpl impl = |
| Optional.ofNullable(stateMachineMap.get(groupId)) |
| .orElseThrow(() -> new ConsensusGroupNotExistException(groupId)); |
| if (impl.isReadOnly()) { |
| return StatusUtils.getStatus(TSStatusCode.SYSTEM_READ_ONLY); |
| } else { |
| TSStatus status; |
| if (groupId instanceof DataRegionId) { |
| long startWriteTime = System.nanoTime(); |
| status = impl.write(request); |
| // only record time cost for data region in Performance Overview Dashboard |
| PERFORMANCE_OVERVIEW_METRICS.recordEngineCost(System.nanoTime() - startWriteTime); |
| } else { |
| status = impl.write(request); |
| } |
| return status; |
| } |
| } |
| |
| @Override |
| public DataSet read(ConsensusGroupId groupId, IConsensusRequest request) |
| throws ConsensusException { |
| return Optional.ofNullable(stateMachineMap.get(groupId)) |
| .orElseThrow(() -> new ConsensusGroupNotExistException(groupId)) |
| .read(request); |
| } |
| |
| @SuppressWarnings("java:S2201") |
| @Override |
| public void createLocalPeer(ConsensusGroupId groupId, List<Peer> peers) |
| throws ConsensusException { |
| int consensusGroupSize = peers.size(); |
| if (consensusGroupSize != 1) { |
| throw new IllegalPeerNumException(consensusGroupSize); |
| } |
| if (!peers.contains(new Peer(groupId, thisNodeId, thisNode))) { |
| throw new IllegalPeerEndpointException(thisNode, peers); |
| } |
| AtomicBoolean exist = new AtomicBoolean(true); |
| Optional.ofNullable( |
| stateMachineMap.computeIfAbsent( |
| groupId, |
| k -> { |
| exist.set(false); |
| |
| String path = buildPeerDir(groupId); |
| File file = new File(path); |
| if (!file.mkdirs()) { |
| logger.warn("Unable to create consensus dir for group {} at {}", groupId, path); |
| return null; |
| } |
| |
| return new SimpleConsensusServerImpl(peers.get(0), registry.apply(groupId)); |
| })) |
| .map( |
| impl -> { |
| impl.start(); |
| return impl; |
| }) |
| .orElseThrow( |
| () -> |
| new ConsensusException( |
| String.format("Unable to create consensus dir for group %s", groupId))); |
| if (exist.get()) { |
| throw new ConsensusGroupAlreadyExistException(groupId); |
| } |
| } |
| |
| @Override |
| public void deleteLocalPeer(ConsensusGroupId groupId) throws ConsensusException { |
| AtomicBoolean exist = new AtomicBoolean(false); |
| stateMachineMap.computeIfPresent( |
| groupId, |
| (k, v) -> { |
| exist.set(true); |
| v.stop(); |
| FileUtils.deleteFileOrDirectory(new File(buildPeerDir(groupId))); |
| return null; |
| }); |
| if (!exist.get()) { |
| throw new ConsensusGroupNotExistException(groupId); |
| } |
| } |
| |
| @Override |
| public void addRemotePeer(ConsensusGroupId groupId, Peer peer) throws ConsensusException { |
| throw new ConsensusException("SimpleConsensus does not support membership changes"); |
| } |
| |
| @Override |
| public void removeRemotePeer(ConsensusGroupId groupId, Peer peer) throws ConsensusException { |
| throw new ConsensusException("SimpleConsensus does not support membership changes"); |
| } |
| |
| @Override |
| public void transferLeader(ConsensusGroupId groupId, Peer newLeader) throws ConsensusException { |
| throw new ConsensusException("SimpleConsensus does not support leader transfer"); |
| } |
| |
| @Override |
| public void triggerSnapshot(ConsensusGroupId groupId, boolean force) throws ConsensusException { |
| throw new ConsensusException("SimpleConsensus does not support snapshot trigger currently"); |
| } |
| |
| @Override |
| public boolean isLeader(ConsensusGroupId groupId) { |
| return true; |
| } |
| |
| @Override |
| public boolean isLeaderReady(ConsensusGroupId groupId) { |
| return true; |
| } |
| |
| @Override |
| public long getLogicalClock(ConsensusGroupId groupId) { |
| return 0; |
| } |
| |
| @Override |
| public Peer getLeader(ConsensusGroupId groupId) { |
| if (!stateMachineMap.containsKey(groupId)) { |
| return null; |
| } |
| return new Peer(groupId, thisNodeId, thisNode); |
| } |
| |
| @Override |
| public List<ConsensusGroupId> getAllConsensusGroupIds() { |
| return new ArrayList<>(stateMachineMap.keySet()); |
| } |
| |
| @Override |
| public List<ConsensusGroupId> getAllConsensusGroupIdsWithoutStarting() { |
| return IoTConsensus.getConsensusGroupIdsFromDir(storageDir, logger); |
| } |
| |
| @Override |
| public String getRegionDirFromConsensusGroupId(ConsensusGroupId groupId) { |
| return buildPeerDir(groupId); |
| } |
| |
| @Override |
| public void reloadConsensusConfig(ConsensusConfig consensusConfig) { |
| // do not support reload consensus config for now |
| } |
| |
| @Override |
| public void resetPeerList(ConsensusGroupId groupId, List<Peer> peers) throws ConsensusException { |
| throw new ConsensusException("SimpleConsensus does not support reset peer list"); |
| } |
| |
| private String buildPeerDir(ConsensusGroupId groupId) { |
| return storageDir + File.separator + groupId.getType().getValue() + "_" + groupId.getId(); |
| } |
| } |