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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing
/*
* 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.geode.distributed.internal.membership;
import org.apache.geode.DataSerializer;
import org.apache.geode.distributed.DistributedMember;
import org.apache.geode.distributed.internal.DistributionManager;
import org.apache.geode.internal.DataSerializableFixedID;
import org.apache.geode.internal.InternalDataSerializer;
import org.apache.geode.internal.Version;
import org.apache.logging.log4j.Logger;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.stream.Collectors;
/**
* The NetView class represents a membership view. Note that this class is not synchronized, so take
* that under advisement if you decide to modify a view with add() or remove().
*
* @since GemFire 5.5
*/
public class NetView implements DataSerializableFixedID {
private int viewId;
private List members;
// TODO this should be a List
private final Map publicKeys = new ConcurrentHashMap<>();
private int[] failureDetectionPorts = new int[10];
private Set shutdownMembers;
private Set crashedMembers;
private InternalDistributedMember creator;
private Set hashedMembers;
private final Object membersLock = new Object();
static public final Random RANDOM = new Random();
public NetView() {
viewId = 0;
members = new ArrayList<>(4);
this.hashedMembers = new HashSet<>(members);
shutdownMembers = Collections.emptySet();
crashedMembers = new HashSet<>();
creator = null;
Arrays.fill(failureDetectionPorts, -1);
}
public NetView(InternalDistributedMember creator) {
viewId = 0;
members = new ArrayList<>(4);
members.add(creator);
hashedMembers = new HashSet<>(members);
shutdownMembers = new HashSet<>();
crashedMembers = Collections.emptySet();
this.creator = creator;
Arrays.fill(failureDetectionPorts, -1);
}
public NetView(InternalDistributedMember creator, int viewId,
List members) {
this.viewId = viewId;
this.members = new ArrayList<>(members);
hashedMembers = new HashSet<>(this.members);
shutdownMembers = new HashSet<>();
crashedMembers = Collections.emptySet();
this.creator = creator;
Arrays.fill(failureDetectionPorts, -1);
}
/**
* Test method
*
* @param size size of the view, used for presizing collections
* @param viewId the ID of the view
*/
public NetView(int size, long viewId) {
this.viewId = (int) viewId;
members = new ArrayList<>(size);
this.hashedMembers = new HashSet<>();
shutdownMembers = new HashSet<>();
crashedMembers = Collections.emptySet();
creator = null;
Arrays.fill(failureDetectionPorts, -1);
}
/**
* Create a new view with the contents of the given view and the specified view ID
*/
public NetView(NetView other, int viewId) {
this.creator = other.creator;
this.viewId = viewId;
this.members = new ArrayList<>(other.members);
this.hashedMembers = new HashSet<>(other.members);
this.failureDetectionPorts = new int[other.failureDetectionPorts.length];
System.arraycopy(other.failureDetectionPorts, 0, this.failureDetectionPorts, 0,
other.failureDetectionPorts.length);
this.shutdownMembers = new HashSet<>(other.shutdownMembers);
this.crashedMembers = new HashSet<>(other.crashedMembers);
this.publicKeys.putAll(other.publicKeys);
}
public NetView(InternalDistributedMember creator, int viewId,
List mbrs, Set shutdowns,
Set crashes) {
this.creator = creator;
this.viewId = viewId;
this.members = mbrs;
this.hashedMembers = new HashSet<>(mbrs);
this.shutdownMembers = shutdowns;
this.crashedMembers = crashes;
this.failureDetectionPorts = new int[mbrs.size() + 10];
Arrays.fill(this.failureDetectionPorts, -1);
}
public int getViewId() {
return this.viewId;
}
public InternalDistributedMember getCreator() {
return this.creator;
}
public void setCreator(InternalDistributedMember creator) {
this.creator = creator;
}
public Object getPublicKey(InternalDistributedMember mbr) {
return publicKeys.get(mbr);
}
public void setPublicKey(InternalDistributedMember mbr, Object key) {
if (mbr != null && key != null) {
publicKeys.put(mbr, key);
}
}
public void setPublicKeys(NetView otherView) {
if (otherView.publicKeys != null) {
this.publicKeys.putAll(otherView.publicKeys);
}
}
public int[] getFailureDetectionPorts() {
return this.failureDetectionPorts;
}
public int getFailureDetectionPort(InternalDistributedMember mbr) {
int idx = members.indexOf(mbr);
if (idx < 0 || idx >= failureDetectionPorts.length) {
return -1;
}
return failureDetectionPorts[idx];
}
public void setFailureDetectionPort(InternalDistributedMember mbr, int port) {
int idx = members.indexOf(mbr);
if (idx < 0) {
throw new IllegalArgumentException("element not found in members list:" + mbr);
}
ensureFDCapacity(idx);
failureDetectionPorts[idx] = port;
}
/**
* Transfer the failure-detection ports from another view to this one
*/
public void setFailureDetectionPorts(NetView otherView) {
int[] ports = otherView.getFailureDetectionPorts();
if (ports != null) {
int idx = 0;
int portsSize = ports.length;
for (InternalDistributedMember mbr : otherView.getMembers()) {
if (contains(mbr)) {
// unit tests create views w/o failure detection ports, so we must check the length
// of the array
if (idx < portsSize) {
setFailureDetectionPort(mbr, ports[idx]);
} else {
setFailureDetectionPort(mbr, -1);
}
}
idx += 1;
}
}
}
/**
* ensures that there is a slot at idx to store an int
*/
private void ensureFDCapacity(int idx) {
if (idx >= failureDetectionPorts.length) {
int[] p = new int[idx + 10];
if (failureDetectionPorts.length > 0) {
System.arraycopy(failureDetectionPorts, 0, p, 0, failureDetectionPorts.length);
}
Arrays.fill(p, idx, idx + 9, -1);
failureDetectionPorts = p;
}
}
public List getMembers() {
return Collections.unmodifiableList(this.members);
}
/**
* return members that are i this view but not the given old view
*/
public List getNewMembers(NetView olderView) {
List result = new ArrayList<>(members);
result.removeAll(olderView.getMembers());
return result;
}
/**
* return members added in this view
*/
public List getNewMembers() {
List result = new ArrayList<>(5);
result.addAll(this.members.stream().filter(mbr -> mbr.getVmViewId() == this.viewId)
.collect(Collectors.toList()));
return result;
}
public Object get(int i) {
return this.members.get(i);
}
public void add(InternalDistributedMember mbr) {
this.hashedMembers.add(mbr);
this.members.add(mbr);
int idx = members.size() - 1;
ensureFDCapacity(idx);
this.failureDetectionPorts[idx] = -1;
}
public void addCrashedMembers(Set mbr) {
this.crashedMembers.addAll(mbr);
}
public boolean remove(InternalDistributedMember mbr) {
this.hashedMembers.remove(mbr);
int idx = this.members.indexOf(mbr);
if (idx >= 0) {
System.arraycopy(failureDetectionPorts, idx + 1, failureDetectionPorts, idx,
failureDetectionPorts.length - idx - 1);
failureDetectionPorts[failureDetectionPorts.length - 1] = -1;
}
return this.members.remove(mbr);
}
public void removeAll(Collection ids) {
this.hashedMembers.removeAll(ids);
ids.forEach(this::remove);
}
public boolean contains(DistributedMember mbr) {
assert mbr instanceof InternalDistributedMember;
return this.hashedMembers.contains(mbr);
}
public int size() {
return this.members.size();
}
public InternalDistributedMember getLeadMember() {
for (InternalDistributedMember mbr : this.members) {
if (mbr.getVmKind() == DistributionManager.NORMAL_DM_TYPE) {
return mbr;
}
}
return null;
}
public InternalDistributedMember getCoordinator() {
synchronized (membersLock) {
for (InternalDistributedMember addr : members) {
if (addr.getNetMember().preferredForCoordinator()) {
return addr;
}
}
if (members.size() > 0) {
return members.get(0);
}
}
return null;
}
/**
* Returns the coordinator of this view, rejecting any in the given collection of IDs
*/
public InternalDistributedMember getCoordinator(
Collection rejections) {
if (rejections == null) {
return getCoordinator();
}
synchronized (membersLock) {
for (InternalDistributedMember addr : members) {
if (addr.getNetMember().preferredForCoordinator() && !rejections.contains(addr)) {
return addr;
}
}
for (InternalDistributedMember addr : members) {
if (!rejections.contains(addr)) {
return addr;
}
}
}
return null;
}
/***
* This functions returns the list of preferred coordinators. One random member from list of
* non-preferred member list. It make sure that random member is not in suspected Set. And local
* member.
*
* @param filter Suspect member set.
* @param localAddress the address of this member
* @param maxNumberDesired number of preferred coordinators to return
* @return list of preferred coordinators
*/
public List getPreferredCoordinators(
Set filter, InternalDistributedMember localAddress,
int maxNumberDesired) {
List results = new ArrayList<>();
List notPreferredCoordinatorList = new ArrayList<>();
synchronized (membersLock) {
for (InternalDistributedMember addr : members) {
if (addr.equals(localAddress)) {
continue;// this is must to add
}
if (addr.getNetMember().preferredForCoordinator() && !filter.contains(addr)) {
results.add(addr);
if (results.size() >= maxNumberDesired) {
break;
}
} else if (!filter.contains(addr)) {
notPreferredCoordinatorList.add(addr);
}
}
results.add(localAddress);// to add local address
if (results.size() < maxNumberDesired && notPreferredCoordinatorList.size() > 0) {
Iterator it = notPreferredCoordinatorList.iterator();
while (it.hasNext() && results.size() < maxNumberDesired) {
results.add(it.next());
}
}
}
return results;
}
public Set getShutdownMembers() {
return this.shutdownMembers;
}
public Set getCrashedMembers() {
return this.crashedMembers;
}
/** check to see if the given address is next in line to be coordinator */
public boolean shouldBeCoordinator(InternalDistributedMember who) {
Iterator it = this.members.iterator();
InternalDistributedMember firstNonPreferred = null;
while (it.hasNext()) {
InternalDistributedMember mbr = it.next();
if (mbr.getNetMember().preferredForCoordinator()) {
return mbr.equals(who);
} else if (firstNonPreferred == null) {
firstNonPreferred = mbr;
}
}
return (firstNonPreferred == null || firstNonPreferred.equals(who));
}
/**
* returns the weight of the members in this membership view
*/
public int memberWeight() {
int result = 0;
InternalDistributedMember lead = getLeadMember();
for (InternalDistributedMember mbr : this.members) {
result += mbr.getNetMember().getMemberWeight();
switch (mbr.getVmKind()) {
case DistributionManager.NORMAL_DM_TYPE:
result += 10;
if (lead != null && mbr.equals(lead)) {
result += 5;
}
break;
case DistributionManager.LOCATOR_DM_TYPE:
result += 3;
break;
case DistributionManager.ADMIN_ONLY_DM_TYPE:
break;
default:
throw new IllegalStateException("Unknown member type: " + mbr.getVmKind());
}
}
return result;
}
/**
* returns the weight of crashed members in this membership view with respect to the given
* previous view
*/
public int getCrashedMemberWeight(NetView oldView) {
int result = 0;
InternalDistributedMember lead = oldView.getLeadMember();
for (InternalDistributedMember mbr : this.crashedMembers) {
if (!oldView.contains(mbr)) {
continue;
}
result += mbr.getNetMember().getMemberWeight();
switch (mbr.getVmKind()) {
case DistributionManager.NORMAL_DM_TYPE:
result += 10;
if (lead != null && mbr.equals(lead)) {
result += 5;
}
break;
case DistributionManager.LOCATOR_DM_TYPE:
result += 3;
break;
case DistributionManager.ADMIN_ONLY_DM_TYPE:
break;
default:
throw new IllegalStateException("Unknown member type: " + mbr.getVmKind());
}
}
return result;
}
/**
* returns the members of this views crashedMembers collection that were members of the given
* view. Admin-only members are not counted
*/
public Set getActualCrashedMembers(NetView oldView) {
Set result = new HashSet<>(this.crashedMembers.size());
result.addAll(this.crashedMembers.stream()
.filter(mbr -> (mbr.getVmKind() != DistributionManager.ADMIN_ONLY_DM_TYPE))
.filter(mbr -> oldView == null || oldView.contains(mbr)).collect(Collectors.toList()));
return result;
}
/**
* logs the weight of failed members wrt the given previous view
*/
public void logCrashedMemberWeights(NetView oldView, Logger log) {
InternalDistributedMember lead = oldView.getLeadMember();
for (InternalDistributedMember mbr : this.crashedMembers) {
if (!oldView.contains(mbr)) {
continue;
}
int mbrWeight = mbr.getNetMember().getMemberWeight();
switch (mbr.getVmKind()) {
case DistributionManager.NORMAL_DM_TYPE:
if (lead != null && mbr.equals(lead)) {
mbrWeight += 15;
} else {
mbrWeight += 10;
}
break;
case DistributionManager.LOCATOR_DM_TYPE:
mbrWeight += 3;
break;
case DistributionManager.ADMIN_ONLY_DM_TYPE:
break;
default:
throw new IllegalStateException("Unknown member type: " + mbr.getVmKind());
}
log.info(" " + mbr + " had a weight of " + mbrWeight);
}
}
public String toString() {
InternalDistributedMember lead = getLeadMember();
StringBuilder sb = new StringBuilder(200);
sb.append("View[").append(creator).append('|').append(viewId).append("] members: [");
boolean first = true;
for (InternalDistributedMember mbr : this.members) {
if (!first)
sb.append(", ");
sb.append(mbr);
if (mbr == lead) {
sb.append("{lead}");
}
first = false;
}
if (!this.shutdownMembers.isEmpty()) {
sb.append("] shutdown: [");
first = true;
for (InternalDistributedMember mbr : this.shutdownMembers) {
if (!first)
sb.append(", ");
sb.append(mbr);
first = false;
}
}
if (!this.crashedMembers.isEmpty()) {
sb.append("] crashed: [");
first = true;
for (InternalDistributedMember mbr : this.crashedMembers) {
if (!first)
sb.append(", ");
sb.append(mbr);
first = false;
}
}
// sb.append("] fd ports: [");
// int[] ports = getFailureDetectionPorts();
// int numMembers = size();
// for (int i=0; i 0) {
// sb.append(' ');
// }
// sb.append(ports[i]);
// }
sb.append("]");
return sb.toString();
}
/**
* Returns the ID from this view that is equal to the argument. If no such ID exists the argument
* is returned.
*/
public synchronized InternalDistributedMember getCanonicalID(InternalDistributedMember id) {
if (hashedMembers.contains(id)) {
for (InternalDistributedMember m : this.members) {
if (id.equals(m)) {
return m;
}
}
}
return id;
}
@Override
public synchronized boolean equals(Object other) {
if (other == this) {
return true;
}
if (other instanceof NetView) {
return this.members.equals(((NetView) other).getMembers());
}
return false;
}
@Override
public synchronized int hashCode() {
return this.members.hashCode();
}
@Override
public void toData(DataOutput out) throws IOException {
DataSerializer.writeObject(creator, out);
out.writeInt(viewId);
writeAsArrayList(members, out);
InternalDataSerializer.writeSet(shutdownMembers, out);
InternalDataSerializer.writeSet(crashedMembers, out);
DataSerializer.writeIntArray(failureDetectionPorts, out);
// TODO expensive serialization
DataSerializer.writeHashMap(publicKeys, out);
}
@Override
public void fromData(DataInput in) throws IOException, ClassNotFoundException {
creator = DataSerializer.readObject(in);
viewId = in.readInt();
members = DataSerializer.readArrayList(in);
assert members != null;
this.hashedMembers = new HashSet<>(members);
shutdownMembers = InternalDataSerializer.readHashSet(in);
crashedMembers = InternalDataSerializer.readHashSet(in);
failureDetectionPorts = DataSerializer.readIntArray(in);
Map pubkeys = DataSerializer.readHashMap(in);
if (pubkeys != null) {
publicKeys.putAll(pubkeys);
}
}
/** this will deserialize as an ArrayList */
private void writeAsArrayList(List list, DataOutput out) throws IOException {
int size;
if (list == null) {
size = -1;
} else {
size = list.size();
}
InternalDataSerializer.writeArrayLength(size, out);
if (size > 0) {
for (int i = 0; i < size; i++) {
DataSerializer.writeObject(list.get(i), out);
}
}
}
@Override
public Version[] getSerializationVersions() {
return null;
}
@Override
public int getDSFID() {
return NETVIEW;
}
}