[GitHub] flink pull request #4239: [FLINK-6988] flink-connector-kafka-0.11 with exact...

[tzulitai <gi...@git.apache.org>]

Github user tzulitai commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4239#discussion_r128163374
  
    --- Diff: flink-connectors/flink-connector-kafka-0.11/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaConsumer011.java ---
    @@ -0,0 +1,117 @@
    +/*
    + * 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.streaming.util.serialization.DeserializationSchema;
    +import org.apache.flink.streaming.util.serialization.KeyedDeserializationSchema;
    +import org.apache.flink.streaming.util.serialization.KeyedDeserializationSchemaWrapper;
    +
    +import java.util.Collections;
    +import java.util.List;
    +import java.util.Properties;
    +
    +/**
    + * The Flink Kafka Consumer is a streaming data source that pulls a parallel data stream from
    + * Apache Kafka 0.11.x. The consumer can run in multiple parallel instances, each of which will pull
    + * data from one or more Kafka partitions.
    + *
    + * <p>The Flink Kafka Consumer participates in checkpointing and guarantees that no data is lost
    + * during a failure, and that the computation processes elements "exactly once".
    + * (Note: These guarantees naturally assume that Kafka itself does not loose any data.)</p>
    + *
    + * <p>Please note that Flink snapshots the offsets internally as part of its distributed checkpoints. The offsets
    + * committed to Kafka / ZooKeeper are only to bring the outside view of progress in sync with Flink's view
    + * of the progress. That way, monitoring and other jobs can get a view of how far the Flink Kafka consumer
    + * has consumed a topic.</p>
    + *
    + * <p>Please refer to Kafka's documentation for the available configuration properties:
    + * http://kafka.apache.org/documentation.html#newconsumerconfigs</p>
    + *
    + * <p><b>NOTE:</b> The implementation currently accesses partition metadata when the consumer
    + * is constructed. That means that the client that submits the program needs to be able to
    + * reach the Kafka brokers or ZooKeeper.</p>
    --- End diff --
    
    This NOTE is no longer valid and can be removed.


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