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/*
* Licensed to ElasticSearch and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch 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.elasticsearch.cluster.node;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.UnmodifiableIterator;
import org.elasticsearch.ElasticSearchIllegalArgumentException;
import org.elasticsearch.common.Booleans;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.collect.MapBuilder;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.regex.Regex;
import org.elasticsearch.common.transport.TransportAddress;
import java.io.IOException;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import static com.google.common.collect.Lists.newArrayList;
import static com.google.common.collect.Maps.newHashMap;
/**
* This class holds all {@link DiscoveryNode} in the cluster and provides convinience methods to
* access, modify merge / diff discovery nodes.
*/
public class DiscoveryNodes implements Iterable {
public static final DiscoveryNodes EMPTY_NODES = newNodesBuilder().build();
private final ImmutableMap nodes;
private final ImmutableMap dataNodes;
private final ImmutableMap masterNodes;
private final String masterNodeId;
private final String localNodeId;
private DiscoveryNodes(ImmutableMap nodes, ImmutableMap dataNodes, ImmutableMap masterNodes, String masterNodeId, String localNodeId) {
this.nodes = nodes;
this.dataNodes = dataNodes;
this.masterNodes = masterNodes;
this.masterNodeId = masterNodeId;
this.localNodeId = localNodeId;
}
@Override
public UnmodifiableIterator iterator() {
return nodes.values().iterator();
}
/**
* Is this a valid nodes that has the minimal information set. The minimal set is defined
* by the localNodeId being set.
*/
public boolean valid() {
return localNodeId != null;
}
/**
* Returns true if the local node is the master node.
*/
public boolean localNodeMaster() {
if (localNodeId == null) {
// we don't know yet the local node id, return false
return false;
}
return localNodeId.equals(masterNodeId);
}
/**
* Get the number of known nodes
* @return number of nodes
*/
public int size() {
return nodes.size();
}
/**
* Get the number of known nodes
* @return number of nodes
*/
public int getSize() {
return size();
}
/**
* Get a {@link Map} of the discovered nodes arranged by their ids
* @return {@link Map} of the discovered nodes arranged by their ids
*/
public ImmutableMap nodes() {
return this.nodes;
}
/**
* Get a {@link Map} of the discovered nodes arranged by their ids
* @return {@link Map} of the discovered nodes arranged by their ids
*/
public ImmutableMap getNodes() {
return nodes();
}
/**
* Get a {@link Map} of the discovered data nodes arranged by their ids
* @return {@link Map} of the discovered data nodes arranged by their ids
*/
public ImmutableMap dataNodes() {
return this.dataNodes;
}
/**
* Get a {@link Map} of the discovered data nodes arranged by their ids
* @return {@link Map} of the discovered data nodes arranged by their ids
*/
public ImmutableMap getDataNodes() {
return dataNodes();
}
/**
* Get a {@link Map} of the discovered master nodes arranged by their ids
* @return {@link Map} of the discovered master nodes arranged by their ids
*/
public ImmutableMap masterNodes() {
return this.masterNodes;
}
/**
* Get a {@link Map} of the discovered master nodes arranged by their ids
* @return {@link Map} of the discovered master nodes arranged by their ids
*/
public ImmutableMap getMasterNodes() {
return masterNodes();
}
/**
* Get a {@link Map} of the discovered master and data nodes arranged by their ids
* @return {@link Map} of the discovered master and data nodes arranged by their ids
*/
public ImmutableMap masterAndDataNodes() {
return MapBuilder.newMapBuilder().putAll(dataNodes).putAll(masterNodes).immutableMap();
}
/**
* Get a node by its id
* @param nodeId id of the wanted node
* @return wanted node if it exists. Otherwise null
*/
public DiscoveryNode get(String nodeId) {
return nodes.get(nodeId);
}
/**
* Determine if a given node exists
* @param nodeId id of the node which existence should be verified
* @return true if the node exists. Otherwise false
*/
public boolean nodeExists(String nodeId) {
return nodes.containsKey(nodeId);
}
/**
* Get the id of the master node
* @return id of the master
*/
public String masterNodeId() {
return this.masterNodeId;
}
/**
* Get the id of the master node
* @return id of the master
*/
public String getMasterNodeId() {
return masterNodeId();
}
/**
* Get the id of the local node
* @return id of the local node
*/
public String localNodeId() {
return this.localNodeId;
}
/**
* Get the id of the local node
* @return id of the local node
*/
public String getLocalNodeId() {
return localNodeId();
}
/**
* Get the local node
* @return local node
*/
public DiscoveryNode localNode() {
return nodes.get(localNodeId);
}
/**
* Get the local node
* @return local node
*/
public DiscoveryNode getLocalNode() {
return localNode();
}
/**
* Get the master node
* @return master node
*/
public DiscoveryNode masterNode() {
return nodes.get(masterNodeId);
}
/**
* Get the master node
* @return master node
*/
public DiscoveryNode getMasterNode() {
return masterNode();
}
/**
* Get a node by its address
* @param address {@link TransportAddress} of the wanted node
* @return node identified by the given address or null if no such node exists
*/
public DiscoveryNode findByAddress(TransportAddress address) {
for (DiscoveryNode node : nodes.values()) {
if (node.address().equals(address)) {
return node;
}
}
return null;
}
public boolean isAllNodes(String... nodesIds) {
return nodesIds == null || nodesIds.length == 0 || (nodesIds.length == 1 && nodesIds[0].equals("_all"));
}
/**
* Resolve a node with a given id
* @param node id of the node to discover
* @return discovered node matching the given id
* @throws ElasticSearchIllegalArgumentException if more than one node matches the request or no nodes have been resolved
*/
public DiscoveryNode resolveNode(String node) {
String[] resolvedNodeIds = resolveNodesIds(node);
if (resolvedNodeIds.length > 1) {
throw new ElasticSearchIllegalArgumentException("resolved [" + node + "] into [" + resolvedNodeIds.length + "] nodes, where expected to be resolved to a single node");
}
if (resolvedNodeIds.length == 0) {
throw new ElasticSearchIllegalArgumentException("failed to resolve [" + node + " ], no matching nodes");
}
return nodes.get(resolvedNodeIds[0]);
}
public String[] resolveNodesIds(String... nodesIds) {
if (isAllNodes(nodesIds)) {
int index = 0;
nodesIds = new String[nodes.size()];
for (DiscoveryNode node : this) {
nodesIds[index++] = node.id();
}
return nodesIds;
} else {
Set resolvedNodesIds = new HashSet(nodesIds.length);
for (String nodeId : nodesIds) {
if (nodeId.equals("_local")) {
String localNodeId = localNodeId();
if (localNodeId != null) {
resolvedNodesIds.add(localNodeId);
}
} else if (nodeId.equals("_master")) {
String masterNodeId = masterNodeId();
if (masterNodeId != null) {
resolvedNodesIds.add(masterNodeId);
}
} else if (nodeExists(nodeId)) {
resolvedNodesIds.add(nodeId);
} else {
// not a node id, try and search by name
for (DiscoveryNode node : this) {
if (Regex.simpleMatch(nodeId, node.name())) {
resolvedNodesIds.add(node.id());
}
}
for (DiscoveryNode node : this) {
if (node.address().match(nodeId)) {
resolvedNodesIds.add(node.id());
}
}
int index = nodeId.indexOf(':');
if (index != -1) {
String matchAttrName = nodeId.substring(0, index);
String matchAttrValue = nodeId.substring(index + 1);
if ("data".equals(matchAttrName)) {
if (Booleans.parseBoolean(matchAttrValue, true)) {
resolvedNodesIds.addAll(dataNodes.keySet());
} else {
resolvedNodesIds.removeAll(dataNodes.keySet());
}
} else if ("master".equals(matchAttrName)) {
if (Booleans.parseBoolean(matchAttrValue, true)) {
resolvedNodesIds.addAll(masterNodes.keySet());
} else {
resolvedNodesIds.removeAll(masterNodes.keySet());
}
} else {
for (DiscoveryNode node : this) {
for (Map.Entry entry : node.attributes().entrySet()) {
String attrName = entry.getKey();
String attrValue = entry.getValue();
if (Regex.simpleMatch(matchAttrName, attrName) && Regex.simpleMatch(matchAttrValue, attrValue)) {
resolvedNodesIds.add(node.id());
}
}
}
}
}
}
}
return resolvedNodesIds.toArray(new String[resolvedNodesIds.size()]);
}
}
public DiscoveryNodes removeDeadMembers(Set newNodes, String masterNodeId) {
Builder builder = new Builder().masterNodeId(masterNodeId).localNodeId(localNodeId);
for (DiscoveryNode node : this) {
if (newNodes.contains(node.id())) {
builder.put(node);
}
}
return builder.build();
}
public DiscoveryNodes newNode(DiscoveryNode node) {
return new Builder().putAll(this).put(node).build();
}
/**
* Returns the changes comparing this nodes to the provided nodes.
*/
public Delta delta(DiscoveryNodes other) {
List removed = newArrayList();
List added = newArrayList();
for (DiscoveryNode node : other) {
if (!this.nodeExists(node.id())) {
removed.add(node);
}
}
for (DiscoveryNode node : this) {
if (!other.nodeExists(node.id())) {
added.add(node);
}
}
DiscoveryNode previousMasterNode = null;
DiscoveryNode newMasterNode = null;
if (masterNodeId != null) {
if (other.masterNodeId == null || !other.masterNodeId.equals(masterNodeId)) {
previousMasterNode = other.masterNode();
newMasterNode = masterNode();
}
}
return new Delta(previousMasterNode, newMasterNode, localNodeId, ImmutableList.copyOf(removed), ImmutableList.copyOf(added));
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("{");
for (DiscoveryNode node : this) {
sb.append(node).append(',');
}
sb.append("}");
return sb.toString();
}
public String prettyPrint() {
StringBuilder sb = new StringBuilder();
sb.append("nodes: \n");
for (DiscoveryNode node : this) {
sb.append(" ").append(node);
if (node == localNode()) {
sb.append(", local");
}
if (node == masterNode()) {
sb.append(", master");
}
sb.append("\n");
}
return sb.toString();
}
public Delta emptyDelta() {
return new Delta(null, null, localNodeId, DiscoveryNode.EMPTY_LIST, DiscoveryNode.EMPTY_LIST);
}
public static class Delta {
private final String localNodeId;
private final DiscoveryNode previousMasterNode;
private final DiscoveryNode newMasterNode;
private final ImmutableList removed;
private final ImmutableList added;
public Delta(String localNodeId, ImmutableList removed, ImmutableList added) {
this(null, null, localNodeId, removed, added);
}
public Delta(@Nullable DiscoveryNode previousMasterNode, @Nullable DiscoveryNode newMasterNode, String localNodeId, ImmutableList removed, ImmutableList added) {
this.previousMasterNode = previousMasterNode;
this.newMasterNode = newMasterNode;
this.localNodeId = localNodeId;
this.removed = removed;
this.added = added;
}
public boolean hasChanges() {
return masterNodeChanged() || !removed.isEmpty() || !added.isEmpty();
}
public boolean masterNodeChanged() {
return newMasterNode != null;
}
public DiscoveryNode previousMasterNode() {
return previousMasterNode;
}
public DiscoveryNode newMasterNode() {
return newMasterNode;
}
public boolean removed() {
return !removed.isEmpty();
}
public ImmutableList removedNodes() {
return removed;
}
public boolean added() {
return !added.isEmpty();
}
public ImmutableList addedNodes() {
return added;
}
public String shortSummary() {
StringBuilder sb = new StringBuilder();
if (!removed() && masterNodeChanged()) {
if (newMasterNode.id().equals(localNodeId)) {
// we are the master, no nodes we removed, we are actually the first master
sb.append("new_master ").append(newMasterNode());
} else {
// we are not the master, so we just got this event. No nodes were removed, so its not a *new* master
sb.append("detected_master ").append(newMasterNode());
}
} else {
if (masterNodeChanged()) {
sb.append("master {new ").append(newMasterNode());
if (previousMasterNode() != null) {
sb.append(", previous ").append(previousMasterNode());
}
sb.append("}");
}
if (removed()) {
if (masterNodeChanged()) {
sb.append(", ");
}
sb.append("removed {");
for (DiscoveryNode node : removedNodes()) {
sb.append(node).append(',');
}
sb.append("}");
}
}
if (added()) {
// don't print if there is one added, and it is us
if (!(addedNodes().size() == 1 && addedNodes().get(0).id().equals(localNodeId))) {
if (removed() || masterNodeChanged()) {
sb.append(", ");
}
sb.append("added {");
for (DiscoveryNode node : addedNodes()) {
if (!node.id().equals(localNodeId)) {
// don't print ourself
sb.append(node).append(',');
}
}
sb.append("}");
}
}
return sb.toString();
}
}
public static Builder newNodesBuilder() {
return new Builder();
}
public static class Builder {
private Map nodes = newHashMap();
private String masterNodeId;
private String localNodeId;
public Builder putAll(DiscoveryNodes nodes) {
this.masterNodeId = nodes.masterNodeId();
this.localNodeId = nodes.localNodeId();
for (DiscoveryNode node : nodes) {
put(node);
}
return this;
}
public Builder put(DiscoveryNode node) {
nodes.put(node.id(), node);
return this;
}
public Builder putAll(Iterable nodes) {
for (DiscoveryNode node : nodes) {
put(node);
}
return this;
}
public Builder remove(String nodeId) {
nodes.remove(nodeId);
return this;
}
public Builder masterNodeId(String masterNodeId) {
this.masterNodeId = masterNodeId;
return this;
}
public Builder localNodeId(String localNodeId) {
this.localNodeId = localNodeId;
return this;
}
public DiscoveryNodes build() {
ImmutableMap.Builder dataNodesBuilder = ImmutableMap.builder();
ImmutableMap.Builder masterNodesBuilder = ImmutableMap.builder();
for (Map.Entry nodeEntry : nodes.entrySet()) {
if (nodeEntry.getValue().dataNode()) {
dataNodesBuilder.put(nodeEntry.getKey(), nodeEntry.getValue());
}
if (nodeEntry.getValue().masterNode()) {
masterNodesBuilder.put(nodeEntry.getKey(), nodeEntry.getValue());
}
}
return new DiscoveryNodes(ImmutableMap.copyOf(nodes), dataNodesBuilder.build(), masterNodesBuilder.build(), masterNodeId, localNodeId);
}
public static void writeTo(DiscoveryNodes nodes, StreamOutput out) throws IOException {
if (nodes.masterNodeId() == null) {
out.writeBoolean(false);
} else {
out.writeBoolean(true);
out.writeString(nodes.masterNodeId);
}
out.writeVInt(nodes.size());
for (DiscoveryNode node : nodes) {
node.writeTo(out);
}
}
public static DiscoveryNodes readFrom(StreamInput in, @Nullable DiscoveryNode localNode) throws IOException {
Builder builder = new Builder();
if (in.readBoolean()) {
builder.masterNodeId(in.readString());
}
if (localNode != null) {
builder.localNodeId(localNode.id());
}
int size = in.readVInt();
for (int i = 0; i < size; i++) {
DiscoveryNode node = DiscoveryNode.readNode(in);
if (localNode != null && node.id().equals(localNode.id())) {
// reuse the same instance of our address and local node id for faster equality
node = localNode;
}
builder.put(node);
}
return builder.build();
}
}
}
