apex-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From tweise <...@git.apache.org>
Subject [GitHub] apex-malhar pull request #298: [APEXMALHAR-2086] Kafka output operator: 0.9....
Date Fri, 01 Jul 2016 05:41:04 GMT
Github user tweise commented on a diff in the pull request:

    --- Diff: kafka/src/main/java/org/apache/apex/malhar/kafka/KafkaSinglePortExactlyOnceOutputOperator.java
    @@ -0,0 +1,374 @@
    + * 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
    + * KIND, either express or implied.  See the License for the
    + * specific language governing permissions and limitations
    + * under the License.
    + */
    +package org.apache.apex.malhar.kafka;
    +import java.io.IOException;
    +import java.util.ArrayList;
    +import java.util.HashMap;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.Properties;
    +import java.util.concurrent.ExecutionException;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +import org.apache.apex.malhar.lib.wal.FSWindowDataManager;
    +import org.apache.apex.malhar.lib.wal.WindowDataManager;
    +import org.apache.kafka.clients.consumer.ConsumerRecord;
    +import org.apache.kafka.clients.consumer.ConsumerRecords;
    +import org.apache.kafka.clients.consumer.KafkaConsumer;
    +import org.apache.kafka.clients.producer.Callback;
    +import org.apache.kafka.clients.producer.ProducerRecord;
    +import org.apache.kafka.clients.producer.RecordMetadata;
    +import org.apache.kafka.common.PartitionInfo;
    +import org.apache.kafka.common.TopicPartition;
    +import com.datatorrent.api.Context;
    +import com.datatorrent.api.DefaultInputPort;
    +import com.datatorrent.api.Operator;
    +import static org.apache.kafka.clients.consumer.ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG;
    +import static org.apache.kafka.clients.consumer.ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG;
    +import static org.apache.kafka.clients.consumer.ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG;
    + * Kafka output operator with exactly once processing semantics under certain conditions.,
    + *
    + *  This operator uses *Key* to distinguish the messages written by particular instance
of the Output operator.
    --- End diff --
    I think this needs more explanation. What makes it exactly once, are there other restrictions
or assumptions?

If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.

View raw message