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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hadoop.mapreduce;
import ai.vespa.feed.client.FeedClient;
import ai.vespa.feed.client.FeedClientBuilder;
import ai.vespa.feed.client.JsonFeeder;
import ai.vespa.feed.client.OperationParseException;
import com.yahoo.vespa.hadoop.mapreduce.util.VespaConfiguration;
import com.yahoo.vespa.hadoop.mapreduce.util.VespaCounters;
import com.yahoo.vespa.http.client.config.FeedParams;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import java.io.IOException;
import java.net.URI;
import java.time.Duration;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.ThreadLocalRandom;
import java.util.logging.Level;
import java.util.logging.Logger;
import static java.util.stream.Collectors.toList;
/**
* {@link VespaRecordWriter} sends the output <key, value> to one or more Vespa endpoints using vespa-feed-client.
*
* @author bjorncs
*/
public class VespaRecordWriter extends RecordWriter<Object, Object> {
private final static Logger log = Logger.getLogger(VespaRecordWriter.class.getCanonicalName());
private final VespaCounters counters;
private final VespaConfiguration config;
private boolean initialized = false;
private JsonFeeder feeder;
protected VespaRecordWriter(VespaConfiguration config, VespaCounters counters) {
this.counters = counters;
this.config = config;
}
@Override
public void write(Object key, Object data) throws IOException {
initializeOnFirstWrite();
String json = data.toString().trim();
feeder.feedSingle(json)
.whenComplete((result, error) -> {
if (error != null) {
if (error instanceof OperationParseException) {
counters.incrementDocumentsSkipped(1);
} else {
String msg = "Failed to feed single document: " + error;
log.log(Level.WARNING, msg, error);
counters.incrementDocumentsFailed(1);
}
} else {
counters.incrementDocumentsOk(1);
}
});
counters.incrementDocumentsSent(1);
if (counters.getDocumentsSent() % config.progressInterval() == 0) {
String progress = String.format("Feed progress: %d / %d / %d / %d (sent, ok, failed, skipped)",
counters.getDocumentsSent(),
counters.getDocumentsOk(),
counters.getDocumentsFailed(),
counters.getDocumentsSkipped());
log.info(progress);
}
}
@Override
public void close(TaskAttemptContext context) throws IOException {
if (feeder != null) {
feeder.close();
feeder = null;
initialized = false;
}
}
/** Override method to alter {@link FeedClient} configuration */
protected void onFeedClientInitialization(FeedClientBuilder builder) {}
private void initializeOnFirstWrite() {
if (initialized) return;
validateConfig();
useRandomizedStartupDelayIfEnabled();
feeder = createJsonStreamFeeder();
initialized = true;
}
private void validateConfig() {
if (config.dataFormat() != FeedParams.DataFormat.JSON_UTF8) {
throw new IllegalArgumentException("Only JSON is support by this feed client implementation");
}
}
private void useRandomizedStartupDelayIfEnabled() {
if (!config.dryrun() && config.randomStartupSleepMs() > 0) {
int delay = ThreadLocalRandom.current().nextInt(config.randomStartupSleepMs());
log.info("Delaying startup by " + delay + " ms");
try {
Thread.sleep(delay);
} catch (Exception e) {}
}
}
private JsonFeeder createJsonStreamFeeder() {
FeedClient feedClient = createFeedClient();
JsonFeeder.Builder builder = JsonFeeder.builder(feedClient)
.withTimeout(Duration.ofMinutes(10));
if (config.route() != null) {
builder.withRoute(config.route());
}
return builder.build();
}
private FeedClient createFeedClient() {
List<URI> endpoints = endpointUris(config);
log.info("Using endpoints " + endpoints);
int streamsPerConnection = streamsPerConnection(config);
log.log(Level.INFO, "Using {0} max streams per connection", new Object[] {streamsPerConnection});
log.log(Level.INFO, "Using {0} connections", new Object[] {config.numConnections()});
FeedClientBuilder feedClientBuilder = FeedClientBuilder.create(endpoints)
.setConnectionsPerEndpoint(config.numConnections())
.setMaxStreamPerConnection(streamsPerConnection)
.setDryrun(config.dryrun())
.setRetryStrategy(retryStrategy(config));
if (config.proxyHost() != null) {
URI proxyUri = URI.create(String.format(
"%s://%s:%d", config.proxyScheme(), config.proxyHost(), config.proxyPort()));
log.info("Using proxy " + proxyUri);
feedClientBuilder.setProxy(proxyUri);
}
onFeedClientInitialization(feedClientBuilder);
return feedClientBuilder.build();
}
private static FeedClient.RetryStrategy retryStrategy(VespaConfiguration config) {
int maxRetries = config.numRetries();
return new FeedClient.RetryStrategy() {
@Override public int retries() { return maxRetries; }
};
}
private static int streamsPerConnection(VespaConfiguration config) {
return Math.min(256, config.maxInFlightRequests() / config.numConnections());
}
private static List<URI> endpointUris(VespaConfiguration config) {
String scheme = config.useSSL().orElse(true) ? "https" : "http";
return Arrays.stream(config.endpoint().split(","))
.map(hostname -> URI.create(String.format("%s://%s:%d/", scheme, hostname, config.defaultPort())))
.collect(toList());
}
}
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