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// 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.doris.ha;
import org.apache.doris.catalog.Env;
import org.apache.doris.journal.bdbje.BDBEnvironment;
import com.google.common.collect.Lists;
import com.sleepycat.bind.tuple.TupleBinding;
import com.sleepycat.je.Database;
import com.sleepycat.je.DatabaseEntry;
import com.sleepycat.je.OperationStatus;
import com.sleepycat.je.rep.MasterStateException;
import com.sleepycat.je.rep.MemberNotFoundException;
import com.sleepycat.je.rep.ReplicatedEnvironment;
import com.sleepycat.je.rep.ReplicationGroup;
import com.sleepycat.je.rep.ReplicationMutableConfig;
import com.sleepycat.je.rep.ReplicationNode;
import com.sleepycat.je.rep.UnknownMasterException;
import com.sleepycat.je.rep.util.ReplicationGroupAdmin;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
public class BDBHA implements HAProtocol {
private static final Logger LOG = LogManager.getLogger(BDBHA.class);
private final BDBEnvironment environment;
private final String nodeName;
private static final int RETRY_TIME = 3;
// Unstable node is a follower node that is joining the cluster but have not
// completed.
// We should record this kind node and set the bdb electable group size to
// (size_of_all_followers - size_of_unstable_nodes).
// Because once the handshake is successful, the joined node is put into the
// optional group,
// but it may take a little time for this node to replicate the historical data.
// This node will never respond to a new data replication until the historical
// replication is completed,
// and if the master cannot receive a quorum response, the write operation will
// fail.
private final Set<String> unReadyElectableNodes = new HashSet<>();
public BDBHA(BDBEnvironment env, String nodeName) {
this.environment = env;
this.nodeName = nodeName;
}
@Override
public boolean fencing() {
Database epochDb = environment.getEpochDB();
for (int i = 0; i < RETRY_TIME; i++) {
try {
long count = epochDb.count();
long myEpoch = count + 1;
LOG.info("start fencing, epoch number is {}", myEpoch);
Long key = myEpoch;
DatabaseEntry theKey = new DatabaseEntry();
TupleBinding<Long> idBinding = TupleBinding.getPrimitiveBinding(Long.class);
idBinding.objectToEntry(key, theKey);
DatabaseEntry theData = new DatabaseEntry(new byte[1]);
OperationStatus status = epochDb.putNoOverwrite(null, theKey, theData);
if (status == OperationStatus.SUCCESS) {
Env.getCurrentEnv().setEpoch(myEpoch);
return true;
} else if (status == OperationStatus.KEYEXIST) {
return false;
} else {
throw new Exception(status.toString());
}
} catch (Exception e) {
LOG.warn("fencing failed. tried {} times", i, e);
try {
Thread.sleep(2000);
} catch (InterruptedException e1) {
LOG.warn("fencing sleep exception:", e1);
}
}
}
return false;
}
@Override
public List<InetSocketAddress> getObserverNodes() {
List<InetSocketAddress> ret = new ArrayList<InetSocketAddress>();
ReplicationGroupAdmin replicationGroupAdmin = environment.getReplicationGroupAdmin();
if (replicationGroupAdmin == null) {
return ret;
}
try {
ReplicationGroup replicationGroup = replicationGroupAdmin.getGroup();
for (ReplicationNode replicationNode : replicationGroup.getSecondaryNodes()) {
ret.add(replicationNode.getSocketAddress());
}
} catch (UnknownMasterException e) {
LOG.warn("Catch UnknownMasterException when calling getObserverNodes.", e);
return Lists.newArrayList();
}
return ret;
}
@Override
public List<InetSocketAddress> getElectableNodes(boolean leaderIncluded) {
List<InetSocketAddress> ret = new ArrayList<InetSocketAddress>();
ReplicationGroupAdmin replicationGroupAdmin = environment.getReplicationGroupAdmin();
if (replicationGroupAdmin == null) {
return ret;
}
try {
ReplicationGroup replicationGroup = replicationGroupAdmin.getGroup();
for (ReplicationNode replicationNode : replicationGroup.getElectableNodes()) {
if (leaderIncluded) {
ret.add(replicationNode.getSocketAddress());
} else {
if (!replicationNode.getName()
.equals(replicationGroupAdmin.getMasterNodeName())) {
ret.add(replicationNode.getSocketAddress());
}
}
}
} catch (UnknownMasterException e) {
LOG.warn("Catch UnknownMasterException when calling getElectableNodes.", e);
return Lists.newArrayList();
}
return ret;
}
@Override
public InetSocketAddress getLeader() {
ReplicationGroupAdmin replicationGroupAdmin = environment.getReplicationGroupAdmin();
String leaderName = replicationGroupAdmin.getMasterNodeName();
ReplicationGroup rg = replicationGroupAdmin.getGroup();
ReplicationNode rn = rg.getMember(leaderName);
return rn.getSocketAddress();
}
@Override
public boolean removeElectableNode(String nodeName) {
ReplicationGroupAdmin replicationGroupAdmin = environment.getReplicationGroupAdmin();
if (replicationGroupAdmin == null) {
return false;
}
try {
LOG.info("remove electable node: {}", nodeName);
replicationGroupAdmin.removeMember(nodeName);
} catch (MemberNotFoundException e) {
LOG.error("the deleting electable node is not found {}", nodeName, e);
return false;
} catch (MasterStateException e) {
LOG.error("the deleting electable node is master {}", nodeName, e);
return false;
}
return true;
}
public boolean updateNodeAddress(String nodeName, String newHostName, int port) {
ReplicationGroupAdmin replicationGroupAdmin = environment.getReplicationGroupAdmin();
if (replicationGroupAdmin == null) {
return false;
}
try {
LOG.info("update electable node {} with new host name: {}, port: {}", nodeName, newHostName, port);
replicationGroupAdmin.updateAddress(nodeName, newHostName, port);
} catch (MemberNotFoundException e) {
LOG.error("the updating electable node is not found {}", nodeName, e);
return false;
} catch (MasterStateException e) {
LOG.error("the updating electable node is master {}", nodeName, e);
return false;
}
return true;
}
public void removeConflictNodeIfExist(String host, int port) {
ReplicationGroupAdmin replicationGroupAdmin = environment.getReplicationGroupAdmin();
if (replicationGroupAdmin == null) {
return;
}
List<String> conflictNodes = Lists.newArrayList();
Set<ReplicationNode> replicationNodes = replicationGroupAdmin.getGroup().getElectableNodes();
for (ReplicationNode replicationNode : replicationNodes) {
if (replicationNode.getHostName().equals(host) && replicationNode.getPort() == port) {
conflictNodes.add(replicationNode.getName());
}
}
for (String conflictNode : conflictNodes) {
removeElectableNode(conflictNode);
}
}
public synchronized void addUnReadyElectableNode(String nodeName, int totalFollowerCount) {
unReadyElectableNodes.add(nodeName);
ReplicatedEnvironment replicatedEnvironment = environment.getReplicatedEnvironment();
if (replicatedEnvironment != null) {
int override = totalFollowerCount - unReadyElectableNodes.size();
LOG.info("set electable group size override to {}, total follower count: {}, add unready node: {}",
override, totalFollowerCount, nodeName);
replicatedEnvironment.setRepMutableConfig(new ReplicationMutableConfig()
.setElectableGroupSizeOverride(override));
}
}
public synchronized void removeUnReadyElectableNode(String nodeName, int totalFollowerCount) {
unReadyElectableNodes.remove(nodeName);
ReplicatedEnvironment replicatedEnvironment = environment.getReplicatedEnvironment();
if (replicatedEnvironment != null) {
if (unReadyElectableNodes.isEmpty()) {
// Setting ElectableGroupSizeOverride to 0 means remove this config,
// and bdb will use the normal electable group size.
LOG.info("remove electable group size override, total follower count: {}, remove unready node: {}",
totalFollowerCount, nodeName);
replicatedEnvironment.setRepMutableConfig(
new ReplicationMutableConfig().setElectableGroupSizeOverride(0));
} else {
int override = totalFollowerCount - unReadyElectableNodes.size();
LOG.info("set electable group size override to {}, total follower count: {}, remove unready node: {}",
override, totalFollowerCount, nodeName);
replicatedEnvironment.setRepMutableConfig(new ReplicationMutableConfig()
.setElectableGroupSizeOverride(override));
}
}
}
}