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MongoSearchUpdaterFlow.java
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MongoSearchUpdaterFlow.java
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/*
* Copyright (c) 2019 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.thingsearch.service.persistence.write.streaming;
import java.util.Collection;
import java.util.Comparator;
import java.util.List;
import java.util.UUID;
import java.util.stream.Collectors;
import org.bson.BsonDocument;
import org.eclipse.ditto.internal.utils.akka.logging.DittoLoggerFactory;
import org.eclipse.ditto.internal.utils.akka.logging.ThreadSafeDittoLogger;
import org.eclipse.ditto.internal.utils.metrics.DittoMetrics;
import org.eclipse.ditto.internal.utils.metrics.instruments.timer.StartedTimer;
import org.eclipse.ditto.thingsearch.service.common.config.PersistenceStreamConfig;
import org.eclipse.ditto.thingsearch.service.persistence.PersistenceConstants;
import org.eclipse.ditto.thingsearch.service.persistence.write.model.AbstractWriteModel;
import org.eclipse.ditto.thingsearch.service.persistence.write.model.WriteResultAndErrors;
import com.mongodb.MongoBulkWriteException;
import com.mongodb.client.model.BulkWriteOptions;
import com.mongodb.client.model.DeleteManyModel;
import com.mongodb.client.model.DeleteOneModel;
import com.mongodb.client.model.ReplaceOneModel;
import com.mongodb.client.model.UpdateManyModel;
import com.mongodb.client.model.UpdateOneModel;
import com.mongodb.client.model.WriteModel;
import com.mongodb.reactivestreams.client.MongoCollection;
import com.mongodb.reactivestreams.client.MongoDatabase;
import akka.NotUsed;
import akka.japi.Pair;
import akka.japi.pf.PFBuilder;
import akka.stream.javadsl.Source;
import akka.stream.javadsl.SubSource;
/**
* Flow mapping write models to write results via the search persistence.
*/
final class MongoSearchUpdaterFlow {
private static final String TRACE_THING_BULK_UPDATE = "things_search_thing_bulkUpdate";
private static final String COUNT_THING_BULK_UPDATES_PER_BULK = "things_search_thing_bulkUpdate_updates_per_bulk";
private static final String UPDATE_TYPE_TAG = "update_type";
private static final ThreadSafeDittoLogger LOGGER =
DittoLoggerFactory.getThreadSafeLogger(MongoSearchUpdaterFlow.class);
/**
* Config key of the dispatcher for the search updater.
*/
static final String DISPATCHER_NAME = "search-updater-dispatcher";
private final MongoCollection<BsonDocument> collection;
private final MongoCollection<BsonDocument> collectionWithAcknowledgements;
private final SearchUpdateMapper searchUpdateMapper;
private MongoSearchUpdaterFlow(final MongoCollection<BsonDocument> collection,
final PersistenceStreamConfig persistenceConfig,
final SearchUpdateMapper searchUpdateMapper) {
this.collection = collection;
collectionWithAcknowledgements = collection.withWriteConcern(
persistenceConfig.getWithAcknowledgementsWriteConcern());
this.searchUpdateMapper = searchUpdateMapper;
}
/**
* Create a MongoSearchUpdaterFlow object.
*
* @param database the MongoDB database.
* @param persistenceConfig the persistence configuration for the search updater stream.
* @param searchUpdateMapper the mapper for custom processing on search updates.
* @return the MongoSearchUpdaterFlow object.
*/
public static MongoSearchUpdaterFlow of(final MongoDatabase database,
final PersistenceStreamConfig persistenceConfig,
final SearchUpdateMapper searchUpdateMapper) {
return new MongoSearchUpdaterFlow(
database.getCollection(PersistenceConstants.THINGS_COLLECTION_NAME, BsonDocument.class),
persistenceConfig,
searchUpdateMapper);
}
/**
* Create a new flow through the search persistence.
* No logging or recovery is attempted.
*
* @param subSource sub-source of write models.
* @param shouldAcknowledge whether to use a write concern to guarantee the consistency of acknowledgements.
* {@link org.eclipse.ditto.base.model.acks.DittoAcknowledgementLabel#SEARCH_PERSISTED} was required or not.
* @param maxBulkSize How many writes to perform in one bulk.
* @return sub-source of write results.
*/
public SubSource<WriteResultAndErrors, NotUsed> start(
final SubSource<AbstractWriteModel, NotUsed> subSource,
final boolean shouldAcknowledge,
final int maxBulkSize) {
return subSource.grouped(maxBulkSize)
.map(MongoSearchUpdaterFlow::sortBySeqNr)
.flatMapConcat(searchUpdateMapper::processWriteModels)
.flatMapConcat(writeModels -> executeBulkWrite(shouldAcknowledge, writeModels));
}
private Source<WriteResultAndErrors, NotUsed> executeBulkWrite(final boolean shouldAcknowledge,
final Collection<Pair<AbstractWriteModel, WriteModel<BsonDocument>>> pairs) {
final MongoCollection<BsonDocument> theCollection;
if (shouldAcknowledge) {
theCollection = collectionWithAcknowledgements;
} else {
theCollection = collection;
}
final var abstractWriteModels = pairs.stream().map(Pair::first).toList();
final var writeModels = pairs.stream().map(Pair::second).toList();
final String bulkWriteCorrelationId = UUID.randomUUID().toString();
if (writeModels.isEmpty()) {
LOGGER.withCorrelationId(bulkWriteCorrelationId)
.debug("Requested to make empty update by write models <{}>", abstractWriteModels);
for (final var abstractWriteModel : abstractWriteModels) {
abstractWriteModel.getMetadata().sendWeakAck(null);
abstractWriteModel.getMetadata().sendBulkWriteCompleteToOrigin(bulkWriteCorrelationId);
}
return Source.empty();
}
if (LOGGER.isDebugEnabled()) {
LOGGER.withCorrelationId(bulkWriteCorrelationId)
.debug("Executing BulkWrite containing <{}> things: [<thingId>:{correlationIds}:<filter>]: {}",
pairs.size(),
pairs.stream()
.map(writeModelPair -> "<" + writeModelPair.first().getMetadata().getThingId() +
">:" +
writeModelPair.first().getMetadata().getEventsCorrelationIds()
.stream()
.collect(Collectors.joining(",", "{", "}"))
+ ":<" + extractFilterBson(writeModelPair.second()) + ">"
)
.toList());
// only log the complete MongoDB writeModels on "TRACE" as they get really big and almost crash the logging backend:
LOGGER.withCorrelationId(bulkWriteCorrelationId)
.trace("Executing BulkWrite <{}>", writeModels);
}
final var bulkWriteTimer = startBulkWriteTimer(writeModels);
return Source.fromPublisher(theCollection.bulkWrite(writeModels, new BulkWriteOptions().ordered(false)))
.map(bulkWriteResult -> WriteResultAndErrors.success(
abstractWriteModels, bulkWriteResult, bulkWriteCorrelationId))
.recoverWithRetries(1, new PFBuilder<Throwable, Source<WriteResultAndErrors, NotUsed>>()
.match(MongoBulkWriteException.class, bulkWriteException ->
Source.single(WriteResultAndErrors.failure(
abstractWriteModels, bulkWriteException, bulkWriteCorrelationId))
)
.matchAny(error ->
Source.single(WriteResultAndErrors.unexpectedError(
abstractWriteModels, error, bulkWriteCorrelationId))
)
.build()
)
.map(resultAndErrors -> {
stopBulkWriteTimer(bulkWriteTimer);
abstractWriteModels.forEach(writeModel ->
ConsistencyLag.startS6Acknowledge(writeModel.getMetadata())
);
return resultAndErrors;
});
}
private static String extractFilterBson(final WriteModel<BsonDocument> writeModel) {
if (writeModel instanceof UpdateManyModel) {
return ((UpdateManyModel<BsonDocument>) writeModel).getFilter().toString();
} else if (writeModel instanceof UpdateOneModel) {
return ((UpdateOneModel<BsonDocument>) writeModel).getFilter().toString();
} else if (writeModel instanceof ReplaceOneModel) {
return ((ReplaceOneModel<BsonDocument>) writeModel).getFilter().toString();
} else if (writeModel instanceof DeleteOneModel) {
return ((DeleteOneModel<BsonDocument>) writeModel).getFilter().toString();
} else if (writeModel instanceof DeleteManyModel) {
return ((DeleteManyModel<BsonDocument>) writeModel).getFilter().toString();
}
return "no filter";
}
private static StartedTimer startBulkWriteTimer(final List<?> writeModels) {
DittoMetrics.histogram(COUNT_THING_BULK_UPDATES_PER_BULK).record((long) writeModels.size());
return DittoMetrics.timer(TRACE_THING_BULK_UPDATE).tag(UPDATE_TYPE_TAG, "bulkUpdate").start();
}
private static void stopBulkWriteTimer(final StartedTimer timer) {
try {
timer.stop();
} catch (final IllegalStateException e) {
// it is okay if the timer stopped already; simply return the result.
}
}
/**
* Sort a list of write models by sequence number so that for each thing ID, any earlier update is guaranteed to
* be applied earlier than any later update.
*
* @param writeModels A list of write models in a batch update.
* @return The sorted write models.
*/
private static List<AbstractWriteModel> sortBySeqNr(final List<AbstractWriteModel> writeModels) {
return writeModels.stream()
.sorted(Comparator.comparing(writeModel -> writeModel.getMetadata().getThingRevision()))
.toList();
}
}