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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9697) Provide connector for Kafka 2.0.0
Date Sun, 14 Oct 2018 00:47:02 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16649168#comment-16649168
] 

ASF GitHub Bot commented on FLINK-9697:
---------------------------------------

eliaslevy commented on a change in pull request #6703: [FLINK-9697] Provide connector for
Kafka 2.0.0
URL: https://github.com/apache/flink/pull/6703#discussion_r224965118
 
 

 ##########
 File path: flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducer.java
 ##########
 @@ -0,0 +1,1351 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF 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.apache.flink.streaming.connectors.kafka;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.annotation.PublicEvolving;
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.api.common.functions.RuntimeContext;
+import org.apache.flink.api.common.serialization.SerializationSchema;
+import org.apache.flink.api.common.state.ListState;
+import org.apache.flink.api.common.state.ListStateDescriptor;
+import org.apache.flink.api.common.time.Time;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.common.typeutils.base.TypeSerializerSingleton;
+import org.apache.flink.api.java.ClosureCleaner;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.core.memory.DataInputView;
+import org.apache.flink.core.memory.DataOutputView;
+import org.apache.flink.metrics.MetricGroup;
+import org.apache.flink.runtime.state.FunctionInitializationContext;
+import org.apache.flink.runtime.state.FunctionSnapshotContext;
+import org.apache.flink.streaming.api.functions.sink.TwoPhaseCommitSinkFunction;
+import org.apache.flink.streaming.api.operators.StreamingRuntimeContext;
+import org.apache.flink.streaming.connectors.kafka.internal.FlinkKafkaInnerProducer;
+import org.apache.flink.streaming.connectors.kafka.internal.TransactionalIdsGenerator;
+import org.apache.flink.streaming.connectors.kafka.internal.metrics.KafkaMetricMuttableWrapper;
+import org.apache.flink.streaming.connectors.kafka.partitioner.FlinkFixedPartitioner;
+import org.apache.flink.streaming.connectors.kafka.partitioner.FlinkKafkaDelegatePartitioner;
+import org.apache.flink.streaming.connectors.kafka.partitioner.FlinkKafkaPartitioner;
+import org.apache.flink.streaming.util.serialization.KeyedSerializationSchema;
+import org.apache.flink.streaming.util.serialization.KeyedSerializationSchemaWrapper;
+import org.apache.flink.util.ExceptionUtils;
+import org.apache.flink.util.NetUtils;
+
+import org.apache.flink.shaded.guava18.com.google.common.collect.Lists;
+
+import org.apache.commons.lang3.StringUtils;
+import org.apache.kafka.clients.producer.Callback;
+import org.apache.kafka.clients.producer.Producer;
+import org.apache.kafka.clients.producer.ProducerConfig;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.apache.kafka.clients.producer.RecordMetadata;
+import org.apache.kafka.common.Metric;
+import org.apache.kafka.common.MetricName;
+import org.apache.kafka.common.PartitionInfo;
+import org.apache.kafka.common.errors.InvalidTxnStateException;
+import org.apache.kafka.common.errors.ProducerFencedException;
+import org.apache.kafka.common.serialization.ByteArraySerializer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.annotation.Nullable;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Properties;
+import java.util.Set;
+import java.util.concurrent.BlockingDeque;
+import java.util.concurrent.LinkedBlockingDeque;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+import static org.apache.flink.util.Preconditions.checkState;
+
+/**
+ * Flink Sink to produce data into a Kafka topic. This producer is compatible with Kafka
2.0.x. By default producer
+ * will use {@link FlinkKafkaProducer.Semantic#AT_LEAST_ONCE} semantic.
+ * Before using {@link FlinkKafkaProducer.Semantic#EXACTLY_ONCE} please refer to Flink's
+ * Kafka connector documentation.
+ */
+@PublicEvolving
+public class FlinkKafkaProducer<IN>
+	extends TwoPhaseCommitSinkFunction<IN, FlinkKafkaProducer.KafkaTransactionState, FlinkKafkaProducer.KafkaTransactionContext>
{
+
+	/**
+	 *  Semantics that can be chosen.
+	 *  <li>{@link #EXACTLY_ONCE}</li>
+	 *  <li>{@link #AT_LEAST_ONCE}</li>
+	 *  <li>{@link #NONE}</li>
+	 */
+	public enum Semantic {
+
+		/**
+		 * Semantic.EXACTLY_ONCE the Flink producer will write all messages in a Kafka transaction
that will be
+		 * committed to the Kafka on a checkpoint.
+		 *
+		 * <p>In this mode {@link FlinkKafkaProducer} sets up a pool of {@link FlinkKafkaInnerProducer}.
Between each
+		 * checkpoint there is created new Kafka transaction, which is being committed on
+		 * {@link FlinkKafkaProducer#notifyCheckpointComplete(long)}. If checkpoint complete notifications
are
+		 * running late, {@link FlinkKafkaProducer} can run out of {@link FlinkKafkaInnerProducer}s
in the pool. In that
+		 * case any subsequent {@link FlinkKafkaProducer#snapshotState(FunctionSnapshotContext)}
requests will fail
+		 * and {@link FlinkKafkaProducer} will keep using the {@link FlinkKafkaInnerProducer} from
previous checkpoint.
+		 * To decrease chances of failing checkpoints there are three options:
+		 * <li>decrease number of max concurrent checkpoints</li>
+		 * <li>make checkpoints more reliable (so that they complete faster)</li>
+		 * <li>increase delay between checkpoints</li>
+		 * <li>increase size of {@link FlinkKafkaInnerProducer}s pool</li>
 
 Review comment:
   increase size -> increase the size

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> Provide connector for Kafka 2.0.0
> ---------------------------------
>
>                 Key: FLINK-9697
>                 URL: https://issues.apache.org/jira/browse/FLINK-9697
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: Ted Yu
>            Assignee: vinoyang
>            Priority: Major
>              Labels: pull-request-available
>
> Kafka 2.0.0 would be released soon.
> Here is vote thread:
> [http://search-hadoop.com/m/Kafka/uyzND1vxnEd23QLxb?subj=+VOTE+2+0+0+RC1]
> We should provide connector for Kafka 2.0.0 once it is released.
> Upgrade to 2.0 documentation : http://kafka.apache.org/20/documentation.html#upgrade_2_0_0



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