1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
/*
* Licensed to Elasticsearch 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.action.support.nodes;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.FailedNodeException;
import org.elasticsearch.action.NoSuchNodeException;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.HandledTransportAction;
import org.elasticsearch.cluster.ClusterName;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.common.collect.ImmutableOpenMap;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.BaseTransportResponseHandler;
import org.elasticsearch.transport.NodeShouldNotConnectException;
import org.elasticsearch.transport.TransportChannel;
import org.elasticsearch.transport.TransportException;
import org.elasticsearch.transport.TransportRequestHandler;
import org.elasticsearch.transport.TransportRequestOptions;
import org.elasticsearch.transport.TransportService;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReferenceArray;
import java.util.function.Supplier;
/**
*
*/
public abstract class TransportNodesAction<NodesRequest extends BaseNodesRequest, NodesResponse extends BaseNodesResponse, NodeRequest extends BaseNodeRequest, NodeResponse extends BaseNodeResponse> extends HandledTransportAction<NodesRequest, NodesResponse> {
protected final ClusterName clusterName;
protected final ClusterService clusterService;
protected final TransportService transportService;
final String transportNodeAction;
protected TransportNodesAction(Settings settings, String actionName, ClusterName clusterName, ThreadPool threadPool,
ClusterService clusterService, TransportService transportService, ActionFilters actionFilters,
IndexNameExpressionResolver indexNameExpressionResolver, Supplier<NodesRequest> request, Supplier<NodeRequest> nodeRequest,
String nodeExecutor) {
super(settings, actionName, threadPool, transportService, actionFilters, indexNameExpressionResolver, request);
this.clusterName = clusterName;
this.clusterService = clusterService;
this.transportService = transportService;
this.transportNodeAction = actionName + "[n]";
transportService.registerRequestHandler(transportNodeAction, nodeRequest, nodeExecutor, new NodeTransportHandler());
}
@Override
protected void doExecute(NodesRequest request, ActionListener<NodesResponse> listener) {
new AsyncAction(request, listener).start();
}
protected boolean transportCompress() {
return false;
}
protected abstract NodesResponse newResponse(NodesRequest request, AtomicReferenceArray nodesResponses);
protected abstract NodeRequest newNodeRequest(String nodeId, NodesRequest request);
protected abstract NodeResponse newNodeResponse();
protected abstract NodeResponse nodeOperation(NodeRequest request);
protected abstract boolean accumulateExceptions();
protected String[] filterNodeIds(DiscoveryNodes nodes, String[] nodesIds) {
return nodesIds;
}
protected String[] resolveNodes(NodesRequest request, ClusterState clusterState) {
return clusterState.nodes().resolveNodesIds(request.nodesIds());
}
private class AsyncAction {
private final NodesRequest request;
private final String[] nodesIds;
private final DiscoveryNode[] nodes;
private final ActionListener<NodesResponse> listener;
private final AtomicReferenceArray<Object> responses;
private final AtomicInteger counter = new AtomicInteger();
private AsyncAction(NodesRequest request, ActionListener<NodesResponse> listener) {
this.request = request;
this.listener = listener;
ClusterState clusterState = clusterService.state();
String[] nodesIds = resolveNodes(request, clusterState);
this.nodesIds = filterNodeIds(clusterState.nodes(), nodesIds);
ImmutableOpenMap<String, DiscoveryNode> nodes = clusterState.nodes().nodes();
this.nodes = new DiscoveryNode[nodesIds.length];
for (int i = 0; i < nodesIds.length; i++) {
this.nodes[i] = nodes.get(nodesIds[i]);
}
this.responses = new AtomicReferenceArray<>(this.nodesIds.length);
}
private void start() {
if (nodesIds.length == 0) {
// nothing to notify
threadPool.generic().execute(new Runnable() {
@Override
public void run() {
listener.onResponse(newResponse(request, responses));
}
});
return;
}
TransportRequestOptions.Builder builder = TransportRequestOptions.builder();
if (request.timeout() != null) {
builder.withTimeout(request.timeout());
}
builder.withCompress(transportCompress());
for (int i = 0; i < nodesIds.length; i++) {
final String nodeId = nodesIds[i];
final int idx = i;
final DiscoveryNode node = nodes[i];
try {
if (node == null) {
onFailure(idx, nodeId, new NoSuchNodeException(nodeId));
} else if (!clusterService.localNode().shouldConnectTo(node) && !clusterService.localNode().equals(node)) {
// the check "!clusterService.localNode().equals(node)" is to maintain backward comp. where before
// we allowed to connect from "local" client node to itself, certain tests rely on it, if we remove it, we need to fix
// those (and they randomize the client node usage, so tricky to find when)
onFailure(idx, nodeId, new NodeShouldNotConnectException(clusterService.localNode(), node));
} else {
NodeRequest nodeRequest = newNodeRequest(nodeId, request);
transportService.sendRequest(node, transportNodeAction, nodeRequest, builder.build(), new BaseTransportResponseHandler<NodeResponse>() {
@Override
public NodeResponse newInstance() {
return newNodeResponse();
}
@Override
public void handleResponse(NodeResponse response) {
onOperation(idx, response);
}
@Override
public void handleException(TransportException exp) {
onFailure(idx, node.id(), exp);
}
@Override
public String executor() {
return ThreadPool.Names.SAME;
}
});
}
} catch (Throwable t) {
onFailure(idx, nodeId, t);
}
}
}
private void onOperation(int idx, NodeResponse nodeResponse) {
responses.set(idx, nodeResponse);
if (counter.incrementAndGet() == responses.length()) {
finishHim();
}
}
private void onFailure(int idx, String nodeId, Throwable t) {
if (logger.isDebugEnabled() && !(t instanceof NodeShouldNotConnectException)) {
logger.debug("failed to execute on node [{}]", t, nodeId);
}
if (accumulateExceptions()) {
responses.set(idx, new FailedNodeException(nodeId, "Failed node [" + nodeId + "]", t));
}
if (counter.incrementAndGet() == responses.length()) {
finishHim();
}
}
private void finishHim() {
NodesResponse finalResponse;
try {
finalResponse = newResponse(request, responses);
} catch (Throwable t) {
logger.debug("failed to combine responses from nodes", t);
listener.onFailure(t);
return;
}
listener.onResponse(finalResponse);
}
}
class NodeTransportHandler implements TransportRequestHandler<NodeRequest> {
@Override
public void messageReceived(final NodeRequest request, final TransportChannel channel) throws Exception {
channel.sendResponse(nodeOperation(request));
}
}
}
|
