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/* This file is part of VoltDB.
* Copyright (C) 2008-2018 VoltDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with VoltDB. If not, see .
*/
package org.voltcore.messaging;
import static com.google_voltpatches.common.base.Preconditions.checkArgument;
import static com.google_voltpatches.common.base.Predicates.equalTo;
import static com.google_voltpatches.common.base.Predicates.not;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketException;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
import java.nio.charset.StandardCharsets;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.Queue;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import javax.net.ssl.SSLEngine;
import org.apache.commons.lang3.StringUtils;
import org.apache.zookeeper_voltpatches.CreateMode;
import org.apache.zookeeper_voltpatches.KeeperException;
import org.apache.zookeeper_voltpatches.ZooDefs.Ids;
import org.apache.zookeeper_voltpatches.ZooKeeper;
import org.json_voltpatches.JSONArray;
import org.json_voltpatches.JSONException;
import org.json_voltpatches.JSONObject;
import org.json_voltpatches.JSONStringer;
import org.voltcore.agreement.AgreementSite;
import org.voltcore.agreement.InterfaceToMessenger;
import org.voltcore.common.Constants;
import org.voltcore.logging.VoltLogger;
import org.voltcore.network.CipherExecutor;
import org.voltcore.network.PicoNetwork;
import org.voltcore.network.TLSPicoNetwork;
import org.voltcore.network.VoltNetworkPool;
import org.voltcore.network.VoltNetworkPool.IOStatsIntf;
import org.voltcore.utils.CoreUtils;
import org.voltcore.utils.InstanceId;
import org.voltcore.utils.Pair;
import org.voltcore.utils.PortGenerator;
import org.voltcore.utils.ShutdownHooks;
import org.voltcore.utils.ssl.MessagingChannel;
import org.voltcore.zk.CoreZK;
import org.voltcore.zk.ZKUtil;
import org.voltdb.AbstractTopology;
import org.voltdb.probe.MeshProber;
import com.google_voltpatches.common.base.Preconditions;
import com.google_voltpatches.common.base.Predicate;
import com.google_voltpatches.common.collect.ImmutableCollection;
import com.google_voltpatches.common.collect.ImmutableList;
import com.google_voltpatches.common.collect.ImmutableMap;
import com.google_voltpatches.common.collect.ImmutableMultimap;
import com.google_voltpatches.common.collect.Maps;
import com.google_voltpatches.common.collect.Multimaps;
import com.google_voltpatches.common.collect.Sets;
import com.google_voltpatches.common.net.HostAndPort;
import com.google_voltpatches.common.primitives.Longs;
import io.netty.handler.ssl.SslContext;
/**
* Host messenger contains all the code necessary to join a cluster mesh, and create mailboxes
* that are addressable from anywhere within that mesh. Host messenger also provides
* a ZooKeeper instance that is maintained within the mesh that can be used for distributed coordination
* and failure detection.
*/
public class HostMessenger implements SocketJoiner.JoinHandler, InterfaceToMessenger {
private static final VoltLogger networkLog = new VoltLogger("NETWORK");
private static final VoltLogger hostLog = new VoltLogger("HOST");
private static final VoltLogger tmLog = new VoltLogger("TM");
//VERBOTEN_THREADS is a set of threads that are not allowed to use ZK client.
public static final CopyOnWriteArraySet VERBOTEN_THREADS = new CopyOnWriteArraySet();
/**
* Callback for watching for host failures.
*/
public interface HostWatcher {
/**
* Called when host failures are detected.
* @param failedHosts List of failed hosts, including hosts currently unknown to this host.
*/
void hostsFailed(Set failedHosts);
}
/**
* Configuration for a host messenger. The leader binds to the coordinator ip and
* not the internal interface or port. Nodes that fail to become the leader will
* connect to the leader using any interface, and will then advertise using the specified
* internal interface/port.
*
* By default all interfaces are used, if one is specified then only that interface will be used.
*
*/
public static class Config {
private static final String ACCEPTOR = "acceptor";
private static final String NETWORK_THREADS = "networkThreads";
private static final String BACKWARDS_TIME_FORGIVENESS_WINDOW = "backwardstimeforgivenesswindow";
private static final String DEAD_HOST_TIMEOUT = "deadhosttimeout";
private static final String INTERNAL_PORT = "internalport";
private static final String INTERNAL_INTERFACE = "internalinterface";
private static final String ZK_INTERFACE = "zkinterface";
private static final String COORDINATOR_IP = "coordinatorip";
private static final String GROUP = "group";
private static final String LOCAL_SITES_COUNT = "localSitesCount";
public InetSocketAddress coordinatorIp;
public String zkInterface = "127.0.0.1:7181";
public String internalInterface = "";
public int internalPort = 3021;
public int deadHostTimeout = Constants.DEFAULT_HEARTBEAT_TIMEOUT_SECONDS * 1000;
public long backwardsTimeForgivenessWindow = 1000 * 60 * 60 * 24 * 7;
public VoltMessageFactory factory = new VoltMessageFactory();
public int networkThreads = Math.max(2, CoreUtils.availableProcessors() / 4);
public Queue coreBindIds;
public JoinAcceptor acceptor = null;
public String group = AbstractTopology.PLACEMENT_GROUP_DEFAULT;
public int localSitesCount;
public final boolean startPause;
public Config(String coordIp, int coordPort, boolean paused) {
startPause = paused;
if (coordIp == null || coordIp.length() == 0) {
coordinatorIp = new InetSocketAddress(coordPort);
} else {
coordinatorIp = new InetSocketAddress(coordIp, coordPort);
}
initNetworkThreads();
}
//Only used by tests.
public Config(boolean paused) {
this(null, org.voltcore.common.Constants.DEFAULT_INTERNAL_PORT, paused);
acceptor = org.voltdb.probe.MeshProber.builder()
.coordinators(":" + internalPort)
.build();
}
/**
* This is for testing only. It aides test suites in the generation of
* configurations that share the same coordinators
* @param ports a port generator
* @param hostCount
* @return a list of {@link Config} that share the same coordinators
*/
public static List generate(PortGenerator ports, int hostCount) {
checkArgument(ports != null, "port generator is null");
checkArgument(hostCount > 0, "host count %s is not greater than 0", hostCount);
ImmutableList.Builder lbld = ImmutableList.builder();
String [] coordinators = new String[hostCount];
for (int i = 0; i < hostCount; ++i) {
Config cnf = new Config(null, org.voltcore.common.Constants.DEFAULT_INTERNAL_PORT, false);
cnf.zkInterface = "127.0.0.1:" + ports.next();
cnf.internalPort = ports.next();
coordinators[i] = ":" + cnf.internalPort;
lbld.add(cnf);
}
List configs = lbld.build();
MeshProber jc = org.voltdb.probe.MeshProber.builder()
.startAction(org.voltdb.StartAction.PROBE)
.hostCount(hostCount)
.coordinators(coordinators)
.build();
for (Config cnf: configs) {
cnf.acceptor = jc;
}
return configs;
}
public int getZKPort() {
return HostAndPort.fromString(zkInterface)
.getPortOrDefault(org.voltcore.common.Constants.DEFAULT_ZK_PORT);
}
private void initNetworkThreads() {
try {
networkLog.info("Default network thread count: " + this.networkThreads);
Integer networkThreadConfig = Integer.getInteger(NETWORK_THREADS);
if ( networkThreadConfig != null ) {
this.networkThreads = networkThreadConfig;
networkLog.info("Overridden network thread count: " + this.networkThreads);
}
} catch (Exception e) {
networkLog.error("Error setting network thread count", e);
}
}
@Override
public String toString() {
JSONStringer js = new JSONStringer();
try {
js.object();
js.keySymbolValuePair(GROUP, group);
js.keySymbolValuePair(COORDINATOR_IP, coordinatorIp.toString());
js.keySymbolValuePair(ZK_INTERFACE, zkInterface);
js.keySymbolValuePair(INTERNAL_INTERFACE, internalInterface);
js.keySymbolValuePair(INTERNAL_PORT, internalPort);
js.keySymbolValuePair(DEAD_HOST_TIMEOUT, deadHostTimeout);
js.keySymbolValuePair(BACKWARDS_TIME_FORGIVENESS_WINDOW, backwardsTimeForgivenessWindow);
js.keySymbolValuePair(NETWORK_THREADS, networkThreads);
js.key(ACCEPTOR).value(acceptor);
js.keySymbolValuePair(LOCAL_SITES_COUNT, localSitesCount);
js.endObject();
return js.toString();
}
catch (Exception e) {
throw new RuntimeException(e);
}
}
}
/**
* Stores the information about the host's IP.
*/
public static class HostInfo {
private final static String HOST_IP = "hostIp";
private final static String GROUP = "group";
private final static String LOCAL_SITES_COUNT = "localSitesCount";
public final String m_hostIp;
public final String m_group;
public final int m_localSitesCount;
public HostInfo(String hostIp, String group, int localSitesCount) {
m_hostIp = hostIp;
m_group = group;
m_localSitesCount = localSitesCount;
}
public byte[] toBytes() throws JSONException
{
final JSONStringer js = new JSONStringer();
js.object();
js.keySymbolValuePair(HOST_IP, m_hostIp);
js.keySymbolValuePair(GROUP, m_group);
js.keySymbolValuePair(LOCAL_SITES_COUNT, m_localSitesCount);
js.endObject();
return js.toString().getBytes(StandardCharsets.UTF_8);
}
public static HostInfo fromBytes(byte[] bytes) throws JSONException
{
final JSONObject obj = new JSONObject(new String(bytes, StandardCharsets.UTF_8));
return new HostInfo(obj.getString(HOST_IP), obj.getString(GROUP), obj.getInt(LOCAL_SITES_COUNT));
}
}
// I want to make these more dynamic at some point in the future --izzy
public static final int AGREEMENT_SITE_ID = -1;
public static final int STATS_SITE_ID = -2;
public static final int ASYNC_COMPILER_SITE_ID = -3; // not used since NT-Procedure conversion
public static final int CLIENT_INTERFACE_SITE_ID = -4;
public static final int SYSCATALOG_SITE_ID = -5;
public static final int SYSINFO_SITE_ID = -6;
public static final int SNAPSHOTSCAN_SITE_ID = -7;
public static final int SNAPSHOTDELETE_SITE_ID = -8;
public static final int REBALANCE_SITE_ID = -9;
public static final int SNAPSHOT_DAEMON_ID = -10;
public static final int SNAPSHOT_IO_AGENT_ID = -11;
public static final int DR_CONSUMER_MP_COORDINATOR_ID = -12;
public static final int TRACE_SITE_ID = -13;
// we should never hand out this site ID. Use it as an empty message destination
public static final int VALHALLA = Integer.MIN_VALUE;
int m_localHostId;
private final Config m_config;
private final SocketJoiner m_joiner;
private final VoltNetworkPool m_network;
// memoized InstanceId
private InstanceId m_instanceId = null;
private boolean m_shuttingDown = false;
// default to false for PD, so hopefully this gets set to true very quickly
private AtomicBoolean m_partitionDetectionEnabled = new AtomicBoolean(false);
private boolean m_partitionDetected = false;
private final HostWatcher m_hostWatcher;
private boolean m_hasAllSecondaryConnectionCreated = false;
private Set m_stopNodeNotice = new HashSet();
private final Object m_mapLock = new Object();
/*
* References to other hosts in the mesh. To any foreign host, there
* will be one primary connection and, if possible, multiple auxiliary
* connections.
* Updates via COW
*/
volatile ImmutableMultimap m_foreignHosts = ImmutableMultimap.of();
/*
* Track dead ForeignHosts that are reported independently by zookeeper and PicoNetwork.
* When both have reported both lists for that hostId should be empty (and removed).
*/
Map> m_zkZombieForeignHosts = new HashMap<> ();
Map> m_picoZombieForeignHosts = new HashMap<> ();
/*
* Reference to the target HSId to FH mapping
* Updates via COW
*/
volatile ImmutableMap m_fhMapping = ImmutableMap.of();
/*
* References to all the local mailboxes
* Updates via COW
*/
volatile ImmutableMap m_siteMailboxes = ImmutableMap.of();
/*
* All failed hosts that have ever been seen.
* Used to dedupe failures so that they are only processed once.
*/
private volatile ImmutableMap m_knownFailedHosts = ImmutableMap.of();
private AgreementSite m_agreementSite;
private ZooKeeper m_zk;
private int m_secondaryConnections;
/* Peers within the same partition group */
private Set m_peers;
private final AtomicInteger m_nextSiteId = new AtomicInteger(0);
private final AtomicInteger m_nextForeignHost = new AtomicInteger();
private final AtomicBoolean m_paused = new AtomicBoolean(false);
/*
* used when coordinating joining hosts
*/
private final JoinAcceptor m_acceptor;
private static final String SECONDARY_PICONETWORK_THREADS = "secondaryPicoNetworkThreads";
public Mailbox getMailbox(long hsId) {
return m_siteMailboxes.get(hsId);
}
public HostMessenger(Config config, HostWatcher hostWatcher) {
this(config, hostWatcher, null, null);
}
public HostMessenger(Config config, HostWatcher hostWatcher, SslContext sslServerContext,
SslContext sslClientContext) {
m_config = config;
m_hostWatcher = hostWatcher;
m_network = new VoltNetworkPool(m_config.networkThreads, 0, m_config.coreBindIds, "Server");
m_acceptor = config.acceptor;
//This ref is updated after the mesh decision is made.
m_paused.set(m_config.startPause);
m_joiner = new SocketJoiner(
m_config.internalInterface,
m_config.internalPort,
m_paused,
m_acceptor,
this,
sslServerContext,
sslClientContext);
// Register a clean shutdown hook for the network threads. This gets cranky
// when crashLocalVoltDB() is called because System.exit() can get called from
// a random network thread which is already shutting down and we'll get delicious
// deadlocks. Take the coward's way out and just don't do this if we're already
// crashing (read as: I refuse to hunt for more shutdown deadlocks).
ShutdownHooks.registerShutdownHook(ShutdownHooks.MIDDLE, false, new Runnable() {
@Override
public void run()
{
for (ForeignHost host : m_foreignHosts.values())
{
// null is OK. It means this host never saw this host id up
if (host != null)
{
host.close();
}
}
}
});
}
public void setPartitionDetectionEnabled(boolean enabled) {
m_partitionDetectionEnabled.set(enabled);
}
/**
* Given a set of the known host IDs before a fault, and the known host IDs in the
* post-fault cluster, determine whether or not we think a network partition may have happened.
* ALSO NOTE: not private so it may be unit-tested.
*/
public static boolean makePPDDecision(int thisHostId, Set previousHosts, Set currentHosts, boolean pdEnabled) {
String logLine = String.format("Partition Detection at host %d code sees current hosts [%s] and previous hosts [%s]",
thisHostId,
StringUtils.join(currentHosts, ','),
StringUtils.join(previousHosts, ','));
tmLog.info(logLine);
// A strict, viable minority is always a partition.
if ((currentHosts.size() * 2) < previousHosts.size()) {
if (pdEnabled) {
tmLog.fatal("It's possible a network partition has split the cluster into multiple viable clusters. "
+ "Current cluster contains fewer than half of the previous servers. "
+ "Shutting down to avoid multiple copies of the database running independently.");
return true; // partition detection triggered
}
else {
tmLog.warn("It's possible a network partition has split the cluster into multiple viable clusters. "
+ "Current cluster contains fewer than half of the previous servers. "
+ "Continuing because network partition detection is disabled, but there "
+ "is significant danger that multiple copies of the database are running "
+ "independently.");
return false; // partition detection not triggered
}
}
// Exact 50-50 splits. The set with the lowest survivor host doesn't trigger PPD
// If the blessed host is in the failure set, this set is not blessed.
if (currentHosts.size() * 2 == previousHosts.size()) {
if (pdEnabled) {
// find the lowest hostId between the still-alive hosts and the
// failed hosts. Which set contains the lowest hostId?
// This should be all the pre-partition hosts IDs. Any new host IDs
// (say, if this was triggered by rejoin), will be greater than any surviving
// host ID, so don't worry about including it in this search.
if (currentHosts.contains(Collections.min(previousHosts))) {
tmLog.info("It's possible a network partition has split the cluster into multiple viable clusters. "
+ "Current cluster contains half of the previous servers, "
+ "including the \"tie-breaker\" node. Continuing.");
return false; // partition detection not triggered
}
else {
tmLog.fatal("It's possible a network partition has split the cluster into multiple viable clusters. "
+ "Current cluster contains exactly half of the previous servers, but does "
+ "not include the \"tie-breaker\" node. "
+ "Shutting down to avoid multiple copies of the database running independently.");
return true; // partition detection triggered
}
}
else {
// 50/50 split. We don't care about tie-breakers for this error message
tmLog.warn("It's possible a network partition has split the cluster into multiple viable clusters. "
+ "Current cluster contains exactly half of the previous servers. "
+ "Continuing because network partition detection is disabled, "
+ "but there is significant danger that multiple copies of the "
+ "database are running independently.");
return false; // partition detection not triggered
}
}
// info message will be printed on every failure that isn't handled above (most cases)
tmLog.info("It's possible a network partition has split the cluster into multiple viable clusters. "
+ "Current cluster contains a majority of the prevous servers and is safe. Continuing.");
return false; // partition detection not triggered
}
private void doPartitionDetectionActivities(Set failedHostIds)
{
if (m_shuttingDown) {
return;
}
// We should never re-enter here once we've decided we're partitioned and doomed
Preconditions.checkState(!m_partitionDetected, "Partition detection triggered twice.");
// figure out previous and current cluster memberships
Set previousHosts = getLiveHostIds();
Set currentHosts = new HashSet<>(previousHosts);
currentHosts.removeAll(failedHostIds);
// sanity!
Preconditions.checkState(previousHosts.contains(m_localHostId));
Preconditions.checkState(currentHosts.contains(m_localHostId));
// decide if we're partitioned
// this will print out warnings if we are
if (makePPDDecision(m_localHostId, previousHosts, currentHosts, m_partitionDetectionEnabled.get())) {
// record here so we can ensure this only happens once for this node
m_partitionDetected = true;
org.voltdb.VoltDB.crashLocalVoltDB("Partition detection logic will stop this process to ensure against split brains.",
false, null);
}
}
private final DisconnectFailedHostsCallback m_failedHostsCallback = new DisconnectFailedHostsCallback() {
@Override
public void disconnect(Set failedHostIds) {
synchronized(HostMessenger.this) {
// Decide if the failures given could put the cluster in a split-brain
// Then decide if we should shut down to ensure that at a MAXIMUM, only
// one viable cluster is running.
// This feature is called "Partition Detection" in the docs.
Set checkThoseNodes = new HashSet(failedHostIds);
checkThoseNodes.removeAll(m_stopNodeNotice);
doPartitionDetectionActivities(checkThoseNodes);
addFailedHosts(failedHostIds);
for (int hostId: failedHostIds) {
removeForeignHost(hostId);
if (!m_shuttingDown) {
// info to avoid printing on the console more than once
// reportForeignHostFailed should print on the console once
networkLog.info(String.format("Host %d failed (DisconnectFailedHostsCallback)", hostId));
}
}
m_acceptor.detract(failedHostIds);
// notifying any watchers who are interested in failure -- used
// initially to do ZK cleanup when rejoining nodes die
if (m_hostWatcher != null && !m_shuttingDown) {
m_hostWatcher.hostsFailed(failedHostIds);
}
}
}
};
private final void addFailedHosts(Set rip) {
synchronized (m_mapLock) {
ImmutableMap.Builder bldr = ImmutableMap.builder()
.putAll(Maps.filterKeys(m_knownFailedHosts, not(in(rip))));
for (int hostId: rip) {
Iterator fhs = m_foreignHosts.get(hostId).iterator();
String hostname = fhs.hasNext() ? fhs.next().hostnameAndIPAndPort() : "UNKNOWN";
bldr.put(hostId, hostname);
}
m_knownFailedHosts = bldr.build();
}
}
private final void addFailedHost(int hostId) {
if (!m_knownFailedHosts.containsKey(hostId)) {
synchronized (m_mapLock) {
ImmutableMap.Builder bldr = ImmutableMap.builder()
.putAll(Maps.filterKeys(m_knownFailedHosts, not(equalTo(hostId))));
Iterator fhs = m_foreignHosts.get(hostId).iterator();
String hostname = fhs.hasNext() ? fhs.next().hostnameAndIPAndPort() : "UNKNOWN";
bldr.put(hostId, hostname);
m_knownFailedHosts = bldr.build();
}
}
}
public synchronized void prepareForShutdown()
{
m_shuttingDown = true;
}
public synchronized boolean isShuttingDown()
{
return m_shuttingDown;
}
/**
* Synchronization protects m_knownFailedHosts and ensures that every failed host is only reported
* once
*/
@Override
public synchronized void reportForeignHostFailed(int hostId) {
long initiatorSiteId = CoreUtils.getHSIdFromHostAndSite(hostId, AGREEMENT_SITE_ID);
m_agreementSite.reportFault(initiatorSiteId);
if (!m_shuttingDown) {
// should be the single console message a user sees when another node fails
networkLog.warn(String.format("Host %d failed. Cluster remains operational.", hostId));
}
}
@Override
public synchronized void relayForeignHostFailed(FaultMessage fm) {
m_agreementSite.reportFault(fm);
if (!m_shuttingDown) {
networkLog.info("Someone else claims a host failed: " + fm);
}
}
/**
* Start the host messenger and connect to the leader, or become the leader
* if necessary.
*
* @param request The requested action to send to other nodes when joining
* the mesh. This is opaque to the HostMessenger, it can be any
* string. HostMessenger will encode this in the request to join mesh to the
* live hosts. The live hosts can use this request string to make further
* decision on whether or not to accept the request.
*/
public void start() throws Exception {
/*
* SJ uses this barrier if this node becomes the leader to know when ZooKeeper
* has been finished bootstrapping.
*/
CountDownLatch zkInitBarrier = new CountDownLatch(1);
/*
* If start returns true then this node is the leader, it bound to the coordinator address
* It needs to bootstrap its agreement site so that other nodes can join
*/
if(m_joiner.start(zkInitBarrier)) {
m_network.start();
/*
* m_localHostId is 0 of course.
*/
long agreementHSId = getHSIdForLocalSite(AGREEMENT_SITE_ID);
/*
* A set containing just the leader (this node)
*/
HashSet agreementSites = new HashSet();
agreementSites.add(agreementHSId);
/*
* A basic site mailbox for the agreement site
*/
SiteMailbox sm = new SiteMailbox(this, agreementHSId);
createMailbox(agreementHSId, sm);
/*
* Construct the site with just this node
*/
m_agreementSite =
new AgreementSite(
agreementHSId,
agreementSites,
0,
sm,
new InetSocketAddress(
m_config.zkInterface.split(":")[0],
Integer.parseInt(m_config.zkInterface.split(":")[1])),
m_config.backwardsTimeForgivenessWindow,
m_failedHostsCallback);
m_agreementSite.start();
m_agreementSite.waitForRecovery();
m_zk = org.voltcore.zk.ZKUtil.getClient(
m_config.zkInterface, 60 * 1000, VERBOTEN_THREADS);
if (m_zk == null) {
throw new Exception("Timed out trying to connect local ZooKeeper instance");
}
CoreZK.createHierarchy(m_zk);
/*
* This creates the ephemeral sequential node with host id 0 which
* this node already used for itself. Just recording that fact.
*/
final int selectedHostId = selectNewHostId(m_config.coordinatorIp.toString());
if (selectedHostId != 0) {
org.voltdb.VoltDB.crashLocalVoltDB("Selected host id for coordinator was not 0, " + selectedHostId, false, null);
}
/*
* seed the leader host criteria ad leader is always host id 0
*/
m_acceptor.accrue(selectedHostId, m_acceptor.decorate(new JSONObject(), Optional.empty()));
// Store the components of the instance ID in ZK
JSONObject instance_id = new JSONObject();
instance_id.put("coord",
ByteBuffer.wrap(m_config.coordinatorIp.getAddress().getAddress()).getInt());
instance_id.put("timestamp", System.currentTimeMillis());
hostLog.debug("Cluster will have instance ID:\n" + instance_id.toString(4));
byte[] payload = instance_id.toString(4).getBytes("UTF-8");
m_zk.create(CoreZK.instance_id, payload, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
/*
* Store all the hosts and host ids here so that waitForGroupJoin
* knows the size of the mesh. This part only registers this host
*/
final HostInfo hostInfo = new HostInfo(m_config.coordinatorIp.toString(), m_config.group, m_config.localSitesCount);
m_zk.create(CoreZK.hosts_host + selectedHostId, hostInfo.toBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
}
zkInitBarrier.countDown();
}
/*
* The network is only available after start() finishes
*/
public VoltNetworkPool getNetwork() {
return m_network;
}
public VoltMessageFactory getMessageFactory()
{
return m_config.factory;
}
/**
* Get a unique ID for this cluster
* @return
*/
public InstanceId getInstanceId()
{
if (m_instanceId == null)
{
try
{
byte[] data =
m_zk.getData(CoreZK.instance_id, false, null);
JSONObject idJSON = new JSONObject(new String(data, "UTF-8"));
m_instanceId = new InstanceId(idJSON.getInt("coord"),
idJSON.getLong("timestamp"));
}
catch (Exception e)
{
String msg = "Unable to get instance ID info from " + CoreZK.instance_id;
hostLog.error(msg);
throw new RuntimeException(msg, e);
}
}
return m_instanceId;
}
/*
* Take the new connection (member of the mesh) and create a foreign host for it
* and put it in the map of foreign hosts
*/
@Override
public void notifyOfJoin(
int hostId, SocketChannel socket,
SSLEngine sslEngine,
InetSocketAddress listeningAddress,
JSONObject jo) {
networkLog.info(getHostId() + " notified of " + hostId);
prepSocketChannel(socket);
ForeignHost fhost = null;
try {
fhost = new ForeignHost(this, hostId, socket, m_config.deadHostTimeout,
listeningAddress,
createPicoNetwork(sslEngine, socket, false));
putForeignHost(hostId, fhost);
fhost.enableRead(VERBOTEN_THREADS);
} catch (java.io.IOException e) {
org.voltdb.VoltDB.crashLocalVoltDB("", true, e);
}
m_acceptor.accrue(hostId, jo);
}
private PicoNetwork createPicoNetwork(SSLEngine sslEngine, SocketChannel socket, boolean isSecondary) {
if (sslEngine == null) {
return new PicoNetwork(socket, isSecondary);
} else {
//TODO: Share the same cipher executor threads as the ones used for client connections?
return new TLSPicoNetwork(socket, isSecondary, sslEngine, CipherExecutor.SERVER);
}
}
/*
* Set all the default options for sockets
*/
private void prepSocketChannel(SocketChannel sc) {
try {
sc.socket().setSendBufferSize(1024 * 1024 * 2);
sc.socket().setReceiveBufferSize(1024 * 1024 * 2);
} catch (SocketException e) {
e.printStackTrace();
}
}
/*
* Convenience method for doing the verbose COW insert into the map
*/
private void putForeignHost(int hostId, ForeignHost fh) {
synchronized (m_mapLock) {
m_foreignHosts = ImmutableMultimap.builder()
.putAll(m_foreignHosts)
.put(hostId, fh)
.build();
}
}
static final Predicate in(final Set set) {
return new Predicate() {
@Override
public boolean apply(Integer input) {
return set.contains(input);
}
};
}
/*
* Convenience method for doing the verbose COW remove from the map
*/
private void removeForeignHost(final int hostId) {
ImmutableCollection fhs = m_foreignHosts.get(hostId);
synchronized (m_mapLock) {
m_foreignHosts = ImmutableMultimap.builder()
.putAll(Multimaps.filterKeys(m_foreignHosts, not(equalTo(hostId))))
.build();
Predicate hostIdNotEqual = new Predicate() {
@Override
public boolean apply(Long intput) {
return CoreUtils.getHostIdFromHSId(intput) != hostId;
}
};
m_fhMapping = ImmutableMap.builder()
.putAll(Maps.filterKeys(m_fhMapping, hostIdNotEqual))
.build();
}
assert(Thread.holdsLock(this)); // Make sure m_zombieForeignHosts is protected
ArrayList picoNetworkZombies = m_picoZombieForeignHosts.get(hostId);
ArrayList zookeeperZombies = new ArrayList<>(fhs.size());
for (ForeignHost fh : fhs) {
if (picoNetworkZombies != null && picoNetworkZombies.contains(fh)) {
picoNetworkZombies.remove(fh);
}
else {
zookeeperZombies.add(fh);
}
fh.close();
}
if (picoNetworkZombies != null && picoNetworkZombies.isEmpty()) {
m_picoZombieForeignHosts.remove(hostId);
}
if (!zookeeperZombies.isEmpty()) {
m_zkZombieForeignHosts.put(hostId, zookeeperZombies);
}
}
public synchronized void piconetworkThreadShutdown(int hostId, ForeignHost fh) {
ArrayList zookeeperZombies = m_zkZombieForeignHosts.get(hostId);
if (zookeeperZombies != null) {
boolean removed = zookeeperZombies.remove(fh);
assert(removed); // Since a zk notification moves all the ForeignHosts for a hostId at once
if (zookeeperZombies.isEmpty()) {
m_zkZombieForeignHosts.remove(hostId);
}
}
else {
ArrayList picoNetworkZombies = m_picoZombieForeignHosts.get(hostId);
if (picoNetworkZombies == null) {
picoNetworkZombies = new ArrayList<>(Arrays.asList(fh));
m_picoZombieForeignHosts.put(hostId, picoNetworkZombies);
}
else {
picoNetworkZombies.add(fh);
}
}
}
public synchronized boolean canCompleteRepair(int hostId) {
return !m_foreignHosts.containsKey(hostId) && !m_picoZombieForeignHosts.containsKey(hostId) && !m_zkZombieForeignHosts.containsKey(hostId);
}
/**
* Any node can serve a request to join. The coordination of generating a new host id
* is done via ZK
*
* @param request The requested action from the rejoining host. This is
* opaque to the HostMessenger, it can be any string. The request string can
* be used to make further decision on whether or not to accept the request
* in the MembershipAcceptor.
*/
@Override
public void requestJoin(SocketChannel socket, SSLEngine sslEngine,
MessagingChannel messagingChannel,
InetSocketAddress listeningAddress, JSONObject jo) throws Exception {
/*
* Generate the host id via creating an ephemeral sequential node
*/
Integer hostId = selectNewHostId(socket.socket().getInetAddress().getHostAddress());
prepSocketChannel(socket);
ForeignHost fhost = null;
try {
try {
JoinAcceptor.PleaDecision decision = m_acceptor.considerMeshPlea(m_zk, hostId, jo);
/*
* Write the response that advertises the cluster topology
*/
writeRequestJoinResponse(hostId, decision, socket, messagingChannel);
if (!decision.accepted) {
socket.close();
return;
}
/*
* Wait for the a response from the joining node saying that it connected
* to all the nodes we just advertised. Use a timeout so that the cluster can't be stuck
* on failed joins.
*/
ByteBuffer finishedJoining = ByteBuffer.allocate(1);
socket.configureBlocking(false);
long start = System.currentTimeMillis();
while (finishedJoining.hasRemaining() && System.currentTimeMillis() - start < 120000) {
// This is just one byte to indicate that it finished joining.
// No need to encrypt because the value of it doesn't matter
int read = socket.read(finishedJoining);
if (read == -1) {
networkLog.info("New connection was unable to establish mesh");
socket.close();
return;
} else if (read < 1) {
Thread.sleep(5);
}
}
/*
* Now add the host to the mailbox system
*/
PicoNetwork picoNetwork = createPicoNetwork(sslEngine, socket, false);
fhost = new ForeignHost(this, hostId, socket, m_config.deadHostTimeout, listeningAddress, picoNetwork);
putForeignHost(hostId, fhost);
fhost.enableRead(VERBOTEN_THREADS);
m_acceptor.accrue(hostId, jo);
} catch (Exception e) {
networkLog.error("Error joining new node", e);
addFailedHost(hostId);
synchronized(HostMessenger.this) {
removeForeignHost(hostId);
}
m_acceptor.detract(hostId);
socket.close();
return;
}
/*
* And the last step is to wait for the new node to join ZooKeeper.
* This node is the one to create the txn that will add the new host to the list of hosts
* with agreement sites across the cluster.
*/
long hsId = CoreUtils.getHSIdFromHostAndSite(hostId, AGREEMENT_SITE_ID);
if (!m_agreementSite.requestJoin(hsId).await(60, TimeUnit.SECONDS)) {
reportForeignHostFailed(hostId);
}
} catch (Throwable e) {
org.voltdb.VoltDB.crashLocalVoltDB("", true, e);
}
}
/*
* Generate a new host id by creating a persistent sequential node
*/
private Integer selectNewHostId(String address) throws Exception {
String node =
m_zk.create(CoreZK.hostids_host,
address.getBytes("UTF-8"), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT_SEQUENTIAL);
return Integer.valueOf(node.substring(node.length() - 10));
}
/*
* Advertise to a newly connecting node the topology of the cluster so that it can connect to
* the rest of the nodes
*/
private void writeRequestJoinResponse(
int hostId,
JoinAcceptor.PleaDecision decision,
SocketChannel socket,
MessagingChannel messagingChannel) throws Exception {
JSONObject jsObj = new JSONObject();
jsObj.put(SocketJoiner.ACCEPTED, decision.accepted);
if (decision.accepted) {
/*
* Tell the new node what its host id is
*/
jsObj.put(SocketJoiner.NEW_HOST_ID, hostId);
/*
* Echo back the address that the node connected from
*/
jsObj.put(SocketJoiner.REPORTED_ADDRESS,
((InetSocketAddress) socket.socket().getRemoteSocketAddress()).getAddress().getHostAddress());
/*
* Create an array containing an id for every node including this one
* even though the connection has already been made
*/
JSONArray jsArray = new JSONArray();
JSONObject hostObj = new JSONObject();
hostObj.put(SocketJoiner.HOST_ID, getHostId());
hostObj.put(SocketJoiner.ADDRESS,
m_config.internalInterface.isEmpty() ?
socket.socket().getLocalAddress().getHostAddress() :
m_config.internalInterface);
hostObj.put(SocketJoiner.PORT, m_config.internalPort);
jsArray.put(hostObj);
for (Entry> entry : m_foreignHosts.asMap().entrySet()) {
if (entry.getValue().isEmpty()) {
continue;
}
int hsId = entry.getKey();
Iterator it = entry.getValue().iterator();
// all fhs to same host have the same address and port
ForeignHost fh = it.next();
hostObj = new JSONObject();
hostObj.put(SocketJoiner.HOST_ID, hsId);
hostObj.put(SocketJoiner.ADDRESS,
fh.m_listeningAddress.getAddress().getHostAddress());
hostObj.put(SocketJoiner.PORT, fh.m_listeningAddress.getPort());
jsArray.put(hostObj);
}
jsObj.put(SocketJoiner.HOSTS, jsArray);
}
else {
jsObj.put(SocketJoiner.REASON, decision.errMsg);
jsObj.put(SocketJoiner.MAY_RETRY, decision.mayRetry);
}
byte messageBytes[] = jsObj.toString(4).getBytes("UTF-8");
ByteBuffer message = ByteBuffer.allocate(4 + messageBytes.length);
message.putInt(messageBytes.length);
message.put(messageBytes).flip();
messagingChannel.writeMessage(message);
}
/*
* SJ invokes this method after a node finishes connecting to the entire cluster.
* This method constructs all the hosts and puts them in the map
*/
@Override
public void notifyOfHosts(
int yourHostId,
int[] hosts,
SocketChannel[] sockets,
SSLEngine[] sslEngines,
InetSocketAddress listeningAddresses[],
Map jos) throws Exception {
m_localHostId = yourHostId;
long agreementHSId = getHSIdForLocalSite(AGREEMENT_SITE_ID);
/*
* Construct the set of agreement sites based on all the hosts that are connected
*/
HashSet agreementSites = new HashSet();
agreementSites.add(agreementHSId);
m_network.start();//network must be running for register to work
for (int ii = 0; ii < hosts.length; ii++) {
networkLog.info(yourHostId + " notified of host " + hosts[ii]);
agreementSites.add(CoreUtils.getHSIdFromHostAndSite(hosts[ii], AGREEMENT_SITE_ID));
prepSocketChannel(sockets[ii]);
ForeignHost fhost = null;
try {
fhost = new ForeignHost(this, hosts[ii], sockets[ii], m_config.deadHostTimeout,
listeningAddresses[ii], createPicoNetwork(sslEngines[ii], sockets[ii], false));
putForeignHost(hosts[ii], fhost);
} catch (java.io.IOException e) {
org.voltdb.VoltDB.crashLocalVoltDB("Failed to instantiate foreign host", true, e);
}
}
m_acceptor.accrue(jos);
/*
* Create the local agreement site. It knows that it is recovering because the number of
* prexisting sites is > 0
*/
SiteMailbox sm = new SiteMailbox(this, agreementHSId);
createMailbox(agreementHSId, sm);
m_agreementSite =
new AgreementSite(
agreementHSId,
agreementSites,
yourHostId,
sm,
new InetSocketAddress(
m_config.zkInterface.split(":")[0],
Integer.parseInt(m_config.zkInterface.split(":")[1])),
m_config.backwardsTimeForgivenessWindow,
m_failedHostsCallback);
/*
* Now that the agreement site mailbox has been created it is safe
* to enable read
*/
for (ForeignHost fh : m_foreignHosts.values()) {
fh.enableRead(VERBOTEN_THREADS);
}
m_agreementSite.start();
/*
* Do the usual thing of waiting for the agreement site
* to join the cluster and creating the client
*/
VERBOTEN_THREADS.addAll(m_network.getThreadIds());
VERBOTEN_THREADS.addAll(m_agreementSite.getThreadIds());
m_agreementSite.waitForRecovery();
m_zk = org.voltcore.zk.ZKUtil.getClient(
m_config.zkInterface, 60 * 1000, VERBOTEN_THREADS);
if (m_zk == null) {
throw new Exception("Timed out trying to connect local ZooKeeper instance");
}
/*
* Publish the address of this node to ZK as seen by the leader
* Also allows waitForGroupJoin to know the number of nodes in the cluster
*/
HostInfo hostInfo;
if (m_config.internalInterface.isEmpty()) {
hostInfo = new HostInfo(new InetSocketAddress(m_joiner.m_reportedInternalInterface, m_config.internalPort).toString(),
m_config.group, m_config.localSitesCount);
} else {
hostInfo = new HostInfo(new InetSocketAddress(m_config.internalInterface, m_config.internalPort).toString(),
m_config.group, m_config.localSitesCount);
}
m_zk.create(CoreZK.hosts_host + getHostId(), hostInfo.toBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
}
/**
* SocketJoiner receives the request of creating a new connection from given host id,
* create a new ForeignHost for this connection.
*/
@Override
public void notifyOfConnection(
int hostId,
SocketChannel socket,
SSLEngine sslEngine,
InetSocketAddress listeningAddress) throws Exception
{
networkLog.info("Host " + getHostId() + " receives a new connection from host " + hostId);
prepSocketChannel(socket);
// Auxiliary connection never time out
ForeignHost fhost = new ForeignHost(this, hostId, socket, Integer.MAX_VALUE,
listeningAddress,
createPicoNetwork(sslEngine, socket, true));
putForeignHost(hostId, fhost);
fhost.enableRead(VERBOTEN_THREADS);
// Do all peers have enough secondary connections?
for (int hId : m_peers) {
if (m_foreignHosts.get(hId).size() != (m_secondaryConnections + 1)) {
return;
}
}
// Now it's time to use secondary pico network, see comments in presend() to know why we can't
// do this earlier.
m_hasAllSecondaryConnectionCreated = true;
}
private static int parseHostId(String name) {
// HostInfo ZK node name has the form "host#", hence the offset of 4 to skip the "host".
return Integer.parseInt(name.substring(name.indexOf("host") + 4));
}
/**
* Wait until all the nodes have built a mesh.
*/
public Map waitForGroupJoin(int expectedHosts) {
Map hostInfos = Maps.newHashMap();
try {
while (true) {
ZKUtil.FutureWatcher fw = new ZKUtil.FutureWatcher();
final List children = m_zk.getChildren(CoreZK.hosts, fw);
final int numChildren = children.size();
for (String child : children) {
final HostInfo info = HostInfo.fromBytes(m_zk.getData(ZKUtil.joinZKPath(CoreZK.hosts, child), false, null));
hostInfos.put(parseHostId(child), info);
}
/*
* If the target number of hosts has been reached
* break out
*/
if ( numChildren == expectedHosts) {
break;
}
/*
* If there are extra hosts that means too many Volt procs were started.
* Kill this node based on the assumption that we are the extra one. In most
* cases this is correct and fine and in the worst case the cluster will hang coming up
* because two or more hosts killed themselves
*/
if ( numChildren > expectedHosts) {
org.voltdb.VoltDB.crashLocalVoltDB("Expected to find " + expectedHosts +
" hosts in cluster at startup but found " + numChildren +
". Terminating this host.", false, null);
}
fw.get();
}
} catch (Exception e) {
org.voltdb.VoltDB.crashLocalVoltDB("Error waiting for hosts to be ready", false, e);
}
assert hostInfos.size() == expectedHosts;
return hostInfos;
}
public Map getHostGroupsFromZK()
throws KeeperException, InterruptedException, JSONException {
Map hostGroups = Maps.newHashMap();
Map hostInfos = getHostInfoMapFromZK();
hostInfos.forEach((k, v) -> {
hostGroups.put(k, v.m_group);
});
return hostGroups;
}
public Map getSitesPerHostMapFromZK()
throws KeeperException, InterruptedException, JSONException {
Map sphMap = Maps.newHashMap();
Map hostInfos = getHostInfoMapFromZK();
hostInfos.forEach((k, v) -> {
sphMap.put(k, v.m_localSitesCount);
});
return sphMap;
}
public Map getHostInfoMapFromZK() throws KeeperException, InterruptedException, JSONException {
Map hostInfoMap = Maps.newHashMap();
List children = m_zk.getChildren(CoreZK.hosts, false);
Queue callbacks = new ArrayDeque();
// issue all callbacks except the last one
for (int i = 0; i < children.size() - 1; i++) {
ZKUtil.ByteArrayCallback cb = new ZKUtil.ByteArrayCallback();
m_zk.getData(ZKUtil.joinZKPath(CoreZK.hosts, children.get(i)), false, cb, null);
callbacks.offer(cb);
}
// remember the last callback
ZKUtil.ByteArrayCallback lastCallback = new ZKUtil.ByteArrayCallback();
String lastChild = children.get(children.size() - 1);
m_zk.getData(ZKUtil.joinZKPath(CoreZK.hosts, lastChild), false, lastCallback, null);
// wait for the last callback to finish
byte[] lastPayload = lastCallback.getData();
final HostInfo lastOne = HostInfo.fromBytes(lastPayload);
hostInfoMap.put(parseHostId(lastChild), lastOne);
// now all previous callbacks should have finished
for (int i = 0; i < children.size() - 1; i++) {
byte[] payload = callbacks.poll().getData();
final HostInfo info = HostInfo.fromBytes(payload);
hostInfoMap.put(parseHostId(children.get(i)), info);
}
return hostInfoMap;
}
public boolean isPaused() {
return m_paused.get();
}
public void unpause() {
m_paused.set(false);
}
//Set Paused so socketjoiner will communicate correct status during mesh building.
public void pause() {
m_paused.set(true);
}
public int getHostId() {
return m_localHostId;
}
public long getHSIdForLocalSite(int site) {
return CoreUtils.getHSIdFromHostAndSite(getHostId(), site);
}
public String getHostname() {
String hostname = org.voltcore.utils.CoreUtils.getHostnameOrAddress();
return hostname;
}
public Set getLiveHostIds()
{
Set hostids = Sets.newTreeSet();
hostids.addAll(m_foreignHosts.keySet());
hostids.add(m_localHostId);
return hostids;
}
/**
* Given a hostid, return the hostname for it
*/
@Override
public String getHostnameForHostID(int hostId) {
if (hostId == m_localHostId) {
return CoreUtils.getHostnameOrAddress();
}
Iterator it = m_foreignHosts.get(hostId).iterator();
if (it.hasNext()) {
ForeignHost fh = it.next();
return fh.hostname();
}
return m_knownFailedHosts.get(hostId) != null ? m_knownFailedHosts.get(hostId) :
"UNKNOWN";
}
/**
*
* @param siteId
* @param mailboxId
* @param message
* @return null if message was delivered locally or a ForeignHost
* reference if a message is read to be delivered remotely.
*/
ForeignHost presend(long hsId, VoltMessage message)
{
int hostId = (int)hsId;
// the local machine case
if (hostId == m_localHostId) {
Mailbox mbox = m_siteMailboxes.get(hsId);
if (mbox != null) {
mbox.deliver(message);
return null;
} else {
networkLog.info("Mailbox is not registered for site id " + CoreUtils.getSiteIdFromHSId(hsId));
return null;
}
}
// the foreign machine case
ImmutableCollection fhosts = m_foreignHosts.get(hostId);
if (fhosts.isEmpty()) {
if (!m_knownFailedHosts.containsKey(hostId)) {
networkLog.warn(
"Attempted to send a message to foreign host with id " +
hostId + " but there is no such host.");
}
return null;
}
ForeignHost fhost = null;
if (fhosts.size() == 1 || CoreUtils.getSiteIdFromHSId(hsId) < 0 ) {
// Always use primary connection to send to well-known mailboxes
fhost = getPrimary(fhosts, hostId);
} else {
/**
* Because the secondary connections are created late in the initialization, after cluster mesh network has
* established, but before the whole cluster has been initialized. It's possible that some non-transactional
* iv2 messages to be sent through foreign host when there is only one primary connection, So in
* case of binding all sites to the primary connection, this check has been added to prevent it.
*/
if (m_hasAllSecondaryConnectionCreated) {
// assign a foreign host for regular mailbox
fhost = m_fhMapping.get(hsId);
if (fhost == null) {
int index = Math.abs(m_nextForeignHost.getAndIncrement() % fhosts.size());
fhost = (ForeignHost) fhosts.toArray()[index];
if (hostLog.isDebugEnabled()) {
hostLog.debug("bind " + CoreUtils.getHostIdFromHSId(hsId) + ":" + CoreUtils.getSiteIdFromHSId(hsId) +
" to " + fhost.hostnameAndIPAndPort());
}
bindForeignHost(hsId, fhost);
}
} else {
// otherwise use primary for a short while
// REPAIR_LOG_REQUEST, REPAIR_LOG_RESPONSE,DummyTaskMessage, DUMMY_TRANSACTION_RESPONSE will be sent on primary
fhost = getPrimary(fhosts, hostId);
}
}
if (!fhost.isUp()) {
if (!m_shuttingDown) {
networkLog.info("Attempted delivery of message to failed site: " + CoreUtils.hsIdToString(hsId));
}
return null;
}
return fhost;
}
public void registerMailbox(Mailbox mailbox) {
if (!m_siteMailboxes.containsKey(mailbox.getHSId())) {
throw new RuntimeException("Can only register a mailbox with an hsid alreadly generated");
}
synchronized (m_mapLock) {
ImmutableMap.Builder b = ImmutableMap.builder();
for (Map.Entry e : m_siteMailboxes.entrySet()) {
if (e.getKey().equals(mailbox.getHSId())) {
b.put(e.getKey(), mailbox);
} else {
b.put(e.getKey(), e.getValue());
}
}
m_siteMailboxes = b.build();
}
}
private void bindForeignHost(Long hsId, ForeignHost fh) {
synchronized (m_mapLock) {
if (m_fhMapping.containsKey(hsId)) {
return;
}
ImmutableMap.Builder b = ImmutableMap.builder();
m_fhMapping = b.putAll(m_fhMapping)
.put(hsId, fh)
.build();
}
}
private ForeignHost getPrimary(ImmutableCollection fhosts, int hostId) {
ForeignHost fhost = null;
for (ForeignHost f : fhosts) {
if (f.isPrimary()) {
fhost = f;
break;
}
}
if (fhost == null) { // unlikely
networkLog.warn("Attempted to deliver a message to host " +
hostId + " but there is no primary connection to the host.");
}
return fhost;
}
/*
* Generate a slot for the mailbox and put a noop box there. Can also
* supply a value
*/
public long generateMailboxId(Long mailboxId) {
final long hsId = mailboxId == null ? getHSIdForLocalSite(m_nextSiteId.getAndIncrement()) : mailboxId;
addMailbox(hsId, new Mailbox() {
@Override
public void send(long hsId, VoltMessage message) {
}
@Override
public void send(long[] hsIds, VoltMessage message) {
}
@Override
public void deliver(VoltMessage message) {
networkLog.info("No-op mailbox(" + CoreUtils.hsIdToString(hsId) + ") dropped message " + message);
}
@Override
public void deliverFront(VoltMessage message) {
}
@Override
public VoltMessage recv() {
return null;
}
@Override
public VoltMessage recvBlocking() {
return null;
}
@Override
public VoltMessage recvBlocking(long timeout) {
return null;
}
@Override
public VoltMessage recv(Subject[] s) {
return null;
}
@Override
public VoltMessage recvBlocking(Subject[] s) {
return null;
}
@Override
public VoltMessage recvBlocking(Subject[] s, long timeout) {
return null;
}
@Override
public long getHSId() {
return 0L;
}
@Override
public void setHSId(long hsId) {
}
});
return hsId;
}
/*
* Create a site mailbox with a generated host id
*/
public Mailbox createMailbox() {
final int siteId = m_nextSiteId.getAndIncrement();
long hsId = getHSIdForLocalSite(siteId);
SiteMailbox sm = new SiteMailbox( this, hsId);
addMailbox(hsId, sm);
return sm;
}
private void addMailbox(long hsId, Mailbox m) {
synchronized (m_mapLock) {
ImmutableMap.Builder b = ImmutableMap.builder();
b.putAll(m_siteMailboxes);
b.put(hsId, m);
m_siteMailboxes = b.build();
}
}
public int getNextSiteId() {
return m_nextSiteId.get();
}
/**
* Discard a mailbox
*/
public void removeMailbox(long hsId) {
synchronized (m_mapLock) {
ImmutableMap.Builder b = ImmutableMap.builder();
for (Map.Entry e : m_siteMailboxes.entrySet()) {
if (e.getKey().equals(hsId)) {
continue;
}
b.put(e.getKey(), e.getValue());
}
m_siteMailboxes = b.build();
}
}
/**
* Discard a mailbox by ref.
*/
public void removeMailbox(final Mailbox mbox) {
synchronized (m_mapLock) {
ImmutableMap.Builder b = ImmutableMap.builder();
for (Map.Entry e : m_siteMailboxes.entrySet()) {
if (e.getValue() == mbox) {
continue;
}
b.put(e.getKey(), e.getValue());
}
m_siteMailboxes = b.build();
}
}
public void send(final long destinationHSId, final VoltMessage message)
{
assert(message != null);
ForeignHost host = presend(destinationHSId, message);
if (host != null) {
host.send(new long [] { destinationHSId }, message);
}
}
public void send(long[] destinationHSIds, final VoltMessage message)
{
assert(message != null);
assert(destinationHSIds != null);
final HashMap> foreignHosts =
new HashMap>(32);
for (long hsId : destinationHSIds) {
ForeignHost host = presend(hsId, message);
if (host == null) {
continue;
}
ArrayList bundle = foreignHosts.get(host);
if (bundle == null) {
bundle = new ArrayList();
foreignHosts.put(host, bundle);
}
bundle.add(hsId);
}
if (foreignHosts.size() == 0) {
return;
}
for (Entry> e : foreignHosts.entrySet()) {
e.getKey().send(Longs.toArray(e.getValue()), message);
}
}
/**
* Block on this call until the number of ready hosts is
* equal to the number of expected hosts.
*/
public void waitForAllHostsToBeReady(int expectedHosts) {
try {
m_zk.create(CoreZK.readyhosts_host, null, Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL_SEQUENTIAL);
while (true) {
ZKUtil.FutureWatcher fw = new ZKUtil.FutureWatcher();
int readyHosts = m_zk.getChildren(CoreZK.readyhosts, fw).size();
if ( readyHosts == expectedHosts) {
break;
}
fw.get();
}
} catch (KeeperException | InterruptedException e) {
org.voltdb.VoltDB.crashLocalVoltDB("Error waiting for hosts to be ready", false, e);
}
}
/**
* For elastic join. Block on this call until the number of ready hosts is
* equal to the number of expected joining hosts.
*/
public void waitForJoiningHostsToBeReady(int expectedHosts, int localHostId) {
try {
//register this host as joining. The host registration will be deleted after joining is completed.
m_zk.create(ZKUtil.joinZKPath(CoreZK.readyjoininghosts, Integer.toString(localHostId)) , null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
while (true) {
ZKUtil.FutureWatcher fw = new ZKUtil.FutureWatcher();
int readyHosts = m_zk.getChildren(CoreZK.readyjoininghosts, fw).size();
if ( readyHosts == expectedHosts) {
break;
}
fw.get();
}
} catch (KeeperException | InterruptedException e) {
org.voltdb.VoltDB.crashLocalVoltDB("Error waiting for hosts to be ready", false, e);
}
}
public void shutdown() throws InterruptedException
{
if (m_zk != null) {
m_zk.close();
}
if (m_agreementSite != null) {
m_agreementSite.shutdown();
}
for (ForeignHost host : m_foreignHosts.values())
{
// null is OK. It means this host never saw this host id up
if (host != null)
{
host.close();
}
}
m_joiner.shutdown();
m_network.shutdown();
VERBOTEN_THREADS.clear();
}
/*
* Register a custom mailbox, optionally specifying what the hsid should be.
*/
public void createMailbox(Long proposedHSId, Mailbox mailbox) {
long hsId = 0;
if (proposedHSId != null) {
if (m_siteMailboxes.containsKey(proposedHSId)) {
org.voltdb.VoltDB.crashLocalVoltDB(
"Attempted to create a mailbox for site " +
CoreUtils.hsIdToString(proposedHSId) + " twice", true, null);
}
hsId = proposedHSId;
} else {
hsId = getHSIdForLocalSite(m_nextSiteId.getAndIncrement());
mailbox.setHSId(hsId);
}
addMailbox(hsId, mailbox);
}
/**
* Get the number of up foreign hosts. Used for test purposes.
* @return The number of up foreign hosts.
*/
public int countForeignHosts() {
int retval = 0;
for (ForeignHost host : m_foreignHosts.values()) {
if ((host != null) && (host.isUp())) {
retval++;
}
}
return retval;
}
/**
* Kill a foreign host socket by id.
* @param hostId The id of the foreign host to kill.
*/
public void closeForeignHostSocket(int hostId) {
Iterator it = m_foreignHosts.get(hostId).iterator();
while (it.hasNext()) {
ForeignHost fh = it.next();
if (fh.isUp()) {
fh.killSocket();
}
}
reportForeignHostFailed(hostId);
}
public ZooKeeper getZK() {
return m_zk;
}
public JoinAcceptor getAcceptor() {
return m_acceptor;
}
/*
* Foreign hosts that share the same host id belong to the same machine, one
* poison pill is deadly enough
*/
public void sendPoisonPill(Collection hostIds, String err, int cause) {
for (int hostId : hostIds) {
Iterator it = m_foreignHosts.get(hostId).iterator();
// No need to overdose the poison pill
if (it.hasNext()) {
ForeignHost fh = it.next();
if (fh.isUp()) {
fh.sendPoisonPill(err, cause);
}
}
}
}
public void sendPoisonPill(String err) {
for (int hostId : m_foreignHosts.keySet()) {
Iterator it = m_foreignHosts.get(hostId).iterator();
if (it.hasNext()) {
ForeignHost fh = it.next();
if (fh.isUp()) {
fh.sendPoisonPill(err, ForeignHost.CRASH_ALL);
}
}
}
}
public void sendPoisonPill(int targetHostId, String err, int cause) {
Iterator it = m_foreignHosts.get(targetHostId).iterator();
if (it.hasNext()) {
ForeignHost fh = it.next();
if (fh.isUp()) {
fh.sendPoisonPill(err, cause);
}
}
}
/* Announce that a node will be stopped soon */
public void sendStopNodeNotice(int targetHostId) {
// First add a notice to local
addStopNodeNotice(targetHostId);
// Then contact other peers
List> tasks = new ArrayList>();
for (int hostId : m_foreignHosts.keySet()) {
if (hostId == m_localHostId) {
continue; /* skip target host */
}
Iterator it = m_foreignHosts.get(hostId).iterator();
if (it.hasNext()) {
ForeignHost fh = it.next();
if (fh.isUp()) {
FutureTask task = fh.sendStopNodeNotice(targetHostId);
if (task != null) {
tasks.add(task);
}
}
}
}
for (FutureTask task : tasks) {
try {
task.get();
} catch (InterruptedException | ExecutionException e) {
hostLog.info("Failed to send StopNode notice to other nodes.");
}
}
}
public boolean validateForeignHostId(Integer hostId) {
return !m_knownFailedHosts.containsKey(hostId);
}
public void setDeadHostTimeout(int timeout) {
Preconditions.checkArgument(timeout > 0, "Timeout value must be > 0, was %s", timeout);
hostLog.info("Dead host timeout set to " + timeout + " milliseconds");
m_config.deadHostTimeout = timeout;
for (ForeignHost fh : m_foreignHosts.values()) {
fh.updateDeadHostTimeout(timeout);
}
}
public Map>
getIOStats(final boolean interval) throws InterruptedException, ExecutionException {
final ImmutableMultimap fhosts = m_foreignHosts;
ArrayList picoNetworks = new ArrayList();
for (ForeignHost fh : fhosts.values()) {
picoNetworks.add(fh.m_network);
}
return m_network.getIOStats(interval, picoNetworks);
}
/**
* Cut the network connection between two hostids immediately
* Useful for simulating network partitions
*/
public void cutLink(int hostIdA, int hostIdB) {
if (m_localHostId == hostIdA) {
Iterator it = m_foreignHosts.get(hostIdB).iterator();
while (it.hasNext()) {
ForeignHost fh = it.next();
fh.cutLink();
}
}
if (m_localHostId == hostIdB) {
Iterator it = m_foreignHosts.get(hostIdA).iterator();
while (it.hasNext()) {
ForeignHost fh = it.next();
fh.cutLink();
}
}
}
public void setPartitionGroupPeers(Set partitionGroupPeers, int hostCount) {
if (partitionGroupPeers.size() > 1) {
StringBuilder strBuilder = new StringBuilder();
strBuilder.append("< ");
partitionGroupPeers.forEach((h) -> {
strBuilder.append(h).append(" ");
});
strBuilder.append(">");
hostLog.info("Host " + strBuilder.toString() + " belongs to the same partition group.");
}
partitionGroupPeers.remove(m_localHostId);
m_peers = partitionGroupPeers;
if (m_peers.isEmpty()) { /* when K-factor = 0 */
m_secondaryConnections = 0;
} else {
m_secondaryConnections = computeSecondaryConnections(hostCount);
}
}
/**
* Basic goal is each host should has the same number of connections compare to the number
* without partition group layout.
*/
private int computeSecondaryConnections(int hostCount) {
// (targetConnectionsWithinPG - existingConnectionsWithinPG) is the the total number of secondary
// connections we try to create, I want the secondary connections to have an even distribution
// across all nodes within the partition group, and round up the result because this is
// integer division, there is a trick to do this: (a + (b - 1)) / b
// so it becomes:
//
// (targetConnectionsWithinPG - existingConnectionsWithinPG) + (existingConnectionsWithinPG - 1)
//
// which equals to (targetConnectionsWithinPG - 1).
//
// All the numbers are on per node basis, PG stands for Partition Group
int connectionsWithoutPG = hostCount - 1;
int existingConnectionsWithinPG = m_peers.size();
int targetConnectionsWithinPG = Math.min( connectionsWithoutPG, CoreUtils.availableProcessors() / 4);
int secondaryConnections = (targetConnectionsWithinPG - 1) / existingConnectionsWithinPG;
Integer configNumberOfConnections = Integer.getInteger(SECONDARY_PICONETWORK_THREADS);
if (configNumberOfConnections != null) {
secondaryConnections = configNumberOfConnections;
hostLog.info("Overridden secondary PicoNetwork network thread count:" + configNumberOfConnections);
} else {
hostLog.info("This node has " + secondaryConnections + " secondary PicoNetwork thread" + ((secondaryConnections > 1) ? "s" :""));
}
return secondaryConnections;
}
// Create connections to nodes within the same partition group
public void createAuxiliaryConnections(boolean isRejoin) {
Set hostsToConnect = Sets.newHashSet();
if (isRejoin) {
hostsToConnect.addAll(m_peers);
} else {
for (Integer host : m_peers) {
// This node sends connection request to all its peers, once the connection
// is established, both nodes will create a foreign host (contains a PicoNetwork thread).
// That said, here we only connect to the nodes that have higher host id to avoid double
// the number of network threads.
if (host > m_localHostId) {
hostsToConnect.add(host);
}
}
}
// it is possible if some nodes are inactive
if (hostsToConnect.isEmpty()) {
return;
}
for (int hostId : hostsToConnect) {
Iterator it = m_foreignHosts.get(hostId).iterator();
if (it.hasNext()) {
InetSocketAddress listeningAddress = it.next().m_listeningAddress;
for (int ii = 0; ii < m_secondaryConnections; ii++) {
try {
SocketJoiner.SocketInfo socketInfo = m_joiner.requestForConnection(listeningAddress, hostId);
// Auxiliary connection never time out
ForeignHost fhost = new ForeignHost(this, hostId, socketInfo.m_socket, Integer.MAX_VALUE,
listeningAddress, createPicoNetwork(socketInfo.m_sslEngine, socketInfo.m_socket, true));
putForeignHost(hostId, fhost);
fhost.enableRead(VERBOTEN_THREADS);
} catch (IOException | JSONException e) {
hostLog.error("Failed to connect to peer nodes.", e);
throw new RuntimeException("Failed to establish socket connection with " +
listeningAddress.getAddress().getHostAddress(), e);
}
}
}
}
// Do all peers have enough secondary connections?
for (int hostId : m_peers) {
if (m_foreignHosts.get(hostId).size() != (m_secondaryConnections + 1)) {
return;
}
}
// Now it's time to use secondary pico network, see comments in presend() to know why we can't
// do this earlier.
m_hasAllSecondaryConnectionCreated = true;
}
public synchronized void addStopNodeNotice(int targetHostId) {
m_stopNodeNotice.add(targetHostId);
}
public synchronized void removeStopNodeNotice(int targetHostId) {
m_stopNodeNotice.remove(targetHostId);
}
public int getFailedSiteCount() {
return m_agreementSite.getFailedSiteCount();
}
}
