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https://issues.apache.org/jira/browse/FLINK-5048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15662987#comment-15662987
]
ASF GitHub Bot commented on FLINK-5048:
---------------------------------------
Github user tzulitai commented on a diff in the pull request:
https://github.com/apache/flink/pull/2789#discussion_r87734293
--- Diff:
flink-streaming-connectors/flink-connector-kafka-0.10/src/main/java/org/apache/flink/streaming/connectors/kafka/internal/KafkaConsumerCallBridge010.java
---
@@ -0,0 +1,40 @@
+/*
+ * 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.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.common.TopicPartition;
+
+import java.util.List;
+
+/**
+ * The ConsumerCallBridge simply calls the {@link
KafkaConsumer#assign(java.util.Collection)} method.
+ *
+ * This indirection is necessary, because Kafka broke binary compatibility
between 0.9 and 0.10,
+ * changing {@code assign(List)} to {@code assign(Collection)}.
+ *
+ * Because of that, we need to two versions whose compiled code goes
against different method signatures.
+ */
+public class KafkaConsumerCallBridge010 extends KafkaConsumerCallBridge {
+
+ @Override
+ public void assignPartitions(KafkaConsumer<?, ?> consumer,
List<TopicPartition> topicPartitions) throws Exception {
--- End diff --
Does the type parameters for key / value of `KafkaConsumer` need to be
generic? Seems like we will only be using `<byte[], byte[]>` anyway.
> Kafka Consumer (0.9/0.10) threading model leads problematic cancellation
> behavior
> ---------------------------------------------------------------------------------
>
> Key: FLINK-5048
> URL: https://issues.apache.org/jira/browse/FLINK-5048
> Project: Flink
> Issue Type: Bug
> Components: Kafka Connector
> Affects Versions: 1.1.3
> Reporter: Stephan Ewen
> Assignee: Stephan Ewen
> Fix For: 1.2.0
>
>
> The {{FLinkKafkaConsumer}} (0.9 / 0.10) spawns a separate thread that
> operates the KafkaConsumer. That thread is shielded from interrupts, because
> the Kafka Consumer has not been handling thread interrupts well.
> Since that thread is also the thread that emits records, it may block in the
> network stack (backpressure) or in chained operators. The later case leads to
> situations where cancellations get very slow unless that thread would be
> interrupted (which it cannot be).
> I propose to change the thread model as follows:
> - A spawned consumer thread pull from the KafkaConsumer and pushes its
> pulled batch of records into a blocking queue (size one)
> - The main thread of the task will pull the record batches from the
> blocking queue and emit the records.
> This allows actually for some additional I/O overlay while limiting the
> additional memory consumption - only two batches are ever held, one being
> fetched and one being emitted.
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