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// 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 (countUnfilledFastHits(result, summaryClass) > 0) {
try {
expectedFillResults = requestSummaries(result, summaryClass);
} catch (InvalidChannelException e) {
result.hits()
.addError(ErrorMessage.createBackendCommunicationError("Invalid channel " + getName() + " (summary fetch)"));
} catch (IOException e) {
result.hits().addError(ErrorMessage.createBackendCommunicationError(
"IO error while talking on channel " + getName() + " (summary fetch): " + e.getMessage()));
}
} 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 countUnfilledFastHits(Result result, String summaryClass) {
int count = 0;
for (Iterator<Hit> i = hitIterator(result); i.hasNext();) {
Hit hit = i.next();
if (hit instanceof FastHit && !hit.isFilled(summaryClass))
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);
}
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();
}
}
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