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
|
// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.fastsearch;
import com.yahoo.fs4.BasicPacket;
import com.yahoo.fs4.ChannelTimeoutException;
import com.yahoo.fs4.GetDocSumsPacket;
import com.yahoo.fs4.Packet;
import com.yahoo.fs4.mplex.Backend;
import com.yahoo.fs4.mplex.FS4Channel;
import com.yahoo.fs4.mplex.InvalidChannelException;
import com.yahoo.prelude.fastsearch.VespaBackEndSearcher.FillHitsResult;
import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.search.dispatch.FillInvoker;
import com.yahoo.search.result.ErrorMessage;
import com.yahoo.search.result.Hit;
import java.io.IOException;
import java.util.Iterator;
import static com.yahoo.prelude.fastsearch.VespaBackEndSearcher.hitIterator;
/**
* {@link FillInvoker} implementation for FS4 nodes and fdispatch
*
* @author ollivir
*/
public class FS4FillInvoker extends FillInvoker {
private final VespaBackEndSearcher searcher;
private FS4Channel channel;
private int expectedFillResults = 0;
// fdispatch code path
FS4FillInvoker(VespaBackEndSearcher searcher, Query query, Backend backend) {
this.searcher = searcher;
this.channel = backend.openChannel();
channel.setQuery(query);
}
@Override
protected void sendFillRequest(Result result, String summaryClass) {
if (countFastHits(result) > 0) {
DocsumPacketKey[] summaryPacketKeys = getPacketKeys(result, summaryClass);
if (summaryPacketKeys.length == 0) {
expectedFillResults = 0;
} else {
try {
expectedFillResults = requestSummaries(result, summaryClass);
} catch (InvalidChannelException e) {
result.hits()
.addError(ErrorMessage.createBackendCommunicationError("Invalid channel " + getName() + " (summary fetch)"));
return;
} catch (IOException e) {
result.hits().addError(ErrorMessage.createBackendCommunicationError(
"IO error while talking on channel " + getName() + " (summary fetch): " + e.getMessage()));
return;
}
}
} else {
expectedFillResults = 0;
}
}
@Override
protected void getFillResults(Result result, String summaryClass) {
if (expectedFillResults == 0) {
return;
}
Packet[] receivedPackets;
try {
receivedPackets = getSummaryResponses(result);
} catch (InvalidChannelException e1) {
result.hits().addError(ErrorMessage.createBackendCommunicationError("Invalid channel " + getName() + " (summary fetch)"));
return;
} catch (ChannelTimeoutException e1) {
result.hits().addError(ErrorMessage.createTimeout("timeout waiting for summaries from " + getName()));
return;
}
if (receivedPackets.length == 0) {
result.hits().addError(ErrorMessage.createBackendCommunicationError(getName() + " got no packets back (summary fetch)"));
return;
}
int skippedHits;
try {
FillHitsResult fillHitsResult = searcher.fillHits(result, receivedPackets, summaryClass);
skippedHits = fillHitsResult.skippedHits;
if (fillHitsResult.error != null) {
result.hits().addError(ErrorMessage.createTimeout(fillHitsResult.error));
return;
}
} catch (TimeoutException e) {
result.hits().addError(ErrorMessage.createTimeout(e.getMessage()));
return;
} catch (IOException e) {
result.hits().addError(ErrorMessage.createBackendCommunicationError(
"Error filling hits with summary fields, source: " + getName() + " Exception thrown: " + e.getMessage()));
return;
}
if (skippedHits > 0)
result.hits().addError(
ErrorMessage.createEmptyDocsums("Missing hit data for summary '" + summaryClass + "' for " + skippedHits + " hits"));
result.analyzeHits();
if (channel.getQuery().getTraceLevel() >= 3) {
int hitNumber = 0;
for (Iterator<com.yahoo.search.result.Hit> i = hitIterator(result); i.hasNext();) {
com.yahoo.search.result.Hit hit = i.next();
if (!(hit instanceof FastHit))
continue;
FastHit fastHit = (FastHit) hit;
String traceMsg = "Hit: " + (hitNumber++) + " from " + (fastHit.isCached() ? "cache" : "backend");
if (!fastHit.isFilled(summaryClass))
traceMsg += ". Error, hit, not filled";
channel.getQuery().trace(traceMsg, false, 3);
}
}
}
@Override
public void release() {
if (channel != null) {
channel.close();
channel = null;
}
}
private int countFastHits(Result result) {
int count = 0;
for (Iterator<Hit> i = hitIterator(result); i.hasNext();) {
if (i.next() instanceof FastHit)
count++;
}
return count;
}
private int requestSummaries(Result result, String summaryClass) throws InvalidChannelException, ClassCastException, IOException {
boolean summaryNeedsQuery = searcher.summaryNeedsQuery(result.getQuery());
if (result.getQuery().getTraceLevel() >= 3)
result.getQuery().trace((summaryNeedsQuery ? "FS4: Resending " : "Not resending ") + "query during document summary fetching", 3);
GetDocSumsPacket docsumsPacket = GetDocSumsPacket.create(result, summaryClass, summaryNeedsQuery);
int compressionLimit = result.getQuery().properties().getInteger(FS4SearchInvoker.PACKET_COMPRESSION_LIMIT, 0);
docsumsPacket.setCompressionLimit(compressionLimit);
if (compressionLimit != 0) {
docsumsPacket.setCompressionType(result.getQuery().properties().getString(FS4SearchInvoker.PACKET_COMPRESSION_TYPE, "lz4"));
}
boolean couldSend = channel.sendPacket(docsumsPacket);
if (!couldSend)
throw new IOException("Could not successfully send GetDocSumsPacket.");
return docsumsPacket.getNumDocsums() + 1;
}
private Packet[] getSummaryResponses(Result result) throws InvalidChannelException, ChannelTimeoutException {
if(expectedFillResults == 0) {
return new Packet[0];
}
BasicPacket[] receivedPackets = channel.receivePackets(result.getQuery().getTimeLeft(), expectedFillResults);
return convertBasicPackets(receivedPackets);
}
/**
* Returns an array of the hits contained in a result
*
* @return array of docids, empty array if no hits
*/
private DocsumPacketKey[] getPacketKeys(Result result, String summaryClass) {
DocsumPacketKey[] packetKeys = new DocsumPacketKey[result.getHitCount()];
int x = 0;
for (Iterator<com.yahoo.search.result.Hit> i = hitIterator(result); i.hasNext();) {
com.yahoo.search.result.Hit hit = i.next();
if (hit instanceof FastHit) {
FastHit fastHit = (FastHit) hit;
if (!fastHit.isFilled(summaryClass)) {
packetKeys[x] = new DocsumPacketKey(fastHit.getGlobalId(), fastHit.getPartId(), summaryClass);
x++;
}
}
}
if (x < packetKeys.length) {
DocsumPacketKey[] tmp = new DocsumPacketKey[x];
System.arraycopy(packetKeys, 0, tmp, 0, x);
return tmp;
} else {
return packetKeys;
}
}
private static Packet[] convertBasicPackets(BasicPacket[] basicPackets) throws ClassCastException {
// trying to cast a BasicPacket[] to Packet[] will compile,
// but lead to a runtime error. At least that's what I got
// from testing and reading the specification. I'm just happy
// if someone tells me what's the proper Java way of doing
// this. -SK
Packet[] packets = new Packet[basicPackets.length];
for (int i = 0; i < basicPackets.length; i++) {
packets[i] = (Packet) basicPackets[i];
}
return packets;
}
private String getName() {
return searcher.getName();
}
}
|
