Github user tzulitai commented on a diff in the pull request: https://github.com/apache/flink/pull/2789#discussion_r87621040 --- Diff: flink-streaming-connectors/flink-connector-kafka-0.9/src/main/java/org/apache/flink/streaming/connectors/kafka/internal/KafkaConsumerThread.java --- @@ -0,0 +1,325 @@ +/* + * 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.internal; + +import org.apache.flink.metrics.MetricGroup; +import org.apache.flink.streaming.connectors.kafka.internals.KafkaTopicPartitionState; +import org.apache.flink.streaming.connectors.kafka.internals.metrics.KafkaMetricWrapper; +import org.apache.kafka.clients.consumer.ConsumerRecords; +import org.apache.kafka.clients.consumer.KafkaConsumer; +import org.apache.kafka.clients.consumer.OffsetAndMetadata; +import org.apache.kafka.clients.consumer.OffsetCommitCallback; +import org.apache.kafka.common.Metric; +import org.apache.kafka.common.MetricName; +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.errors.WakeupException; + +import org.slf4j.Logger; + +import java.util.ArrayList; +import java.util.List; +import java.util.Map; +import java.util.Properties; +import java.util.concurrent.atomic.AtomicReference; + +import static org.apache.flink.util.Preconditions.checkNotNull; + +/** + * The thread the runs the {@link KafkaConsumer}, connecting to the brokers and polling records. + * The thread pushes the data into a {@link Handover} to be picked up by the fetcher that will + * deserialize and emit the records. + * + * <p><b>IMPORTANT:</b> This thread must not be interrupted when attempting to shut it down. + * The Kafka consumer code was found to not always handle interrupts well, and to even + * deadlock in certain situations. + * + * <p>Implementation Note: This code is written to be reusable in later versions of the KafkaConsumer. + * Because Kafka is not maintaining binary compatibility, we use a "call bridge" as an indirection + * to the KafkaConsumer calls that change signature. + */ +public class KafkaConsumerThread extends Thread { + + /** Logger for this consumer */ + final Logger log; --- End diff -- Private?
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