Github user revans2 commented on a diff in the pull request:

    https://github.com/apache/storm/pull/1131#discussion_r54458052
  
    --- Diff: 
external/storm-kafka-new-consumer-api/src/main/java/org/apache/storm/kafka/spout/KafkaSpout.java
 ---
    @@ -0,0 +1,445 @@
    +/*
    + * 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.storm.kafka.spout;
    +
    +import org.apache.kafka.clients.consumer.ConsumerRebalanceListener;
    +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.consumer.OffsetAndMetadata;
    +import org.apache.kafka.common.TopicPartition;
    +import 
org.apache.storm.kafka.spout.KafkaSpoutConfig.FirstPollOffsetStrategy;
    +import org.apache.storm.spout.SpoutOutputCollector;
    +import org.apache.storm.task.TopologyContext;
    +import org.apache.storm.topology.OutputFieldsDeclarer;
    +import org.apache.storm.topology.base.BaseRichSpout;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import java.util.Collection;
    +import java.util.Comparator;
    +import java.util.HashMap;
    +import java.util.Iterator;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.NavigableSet;
    +import java.util.TreeSet;
    +import java.util.concurrent.TimeUnit;
    +
    +import static 
org.apache.storm.kafka.spout.KafkaSpoutConfig.FirstPollOffsetStrategy.EARLIEST;
    +import static 
org.apache.storm.kafka.spout.KafkaSpoutConfig.FirstPollOffsetStrategy.LATEST;
    +import static 
org.apache.storm.kafka.spout.KafkaSpoutConfig.FirstPollOffsetStrategy.UNCOMMITTED_EARLIEST;
    +import static 
org.apache.storm.kafka.spout.KafkaSpoutConfig.FirstPollOffsetStrategy.UNCOMMITTED_LATEST;
    +
    +public class KafkaSpout<K,V> extends BaseRichSpout {
    +    private static final Logger LOG = 
LoggerFactory.getLogger(KafkaSpout.class);
    +    private static final Comparator<MessageId> OFFSET_COMPARATOR = new 
OffsetComparator();
    +
    +    // Storm
    +    protected SpoutOutputCollector collector;
    +
    +    // Kafka
    +    private final KafkaSpoutConfig<K, V> kafkaSpoutConfig;
    +    private KafkaConsumer<K, V> kafkaConsumer;
    +    private transient boolean consumerAutoCommitMode;
    +    private transient FirstPollOffsetStrategy firstPollOffsetStrategy;
    +
    +    // Bookkeeping
    +    private KafkaSpoutStreams kafkaSpoutStreams;
    +    private KafkaTupleBuilder<K,V> tupleBuilder;
    +    private transient Timer timer;                                    // 
timer == null for auto commit mode
    +    private transient Map<TopicPartition, OffsetEntry> acked;         // 
emitted tuples that were successfully acked. These tuples will be committed by 
the commitOffsetsTask or on consumer rebalance
    +    private transient int maxRetries;                                 // 
Max number of times a tuple is retried
    +    private transient boolean initialized;          // Flag indicating 
that the spout is still undergoing initialization process.
    +                                                    // Initialization is 
only complete after the first call to  
KafkaSpoutConsumerRebalanceListener.onPartitionsAssigned()
    +
    +
    +    public KafkaSpout(KafkaSpoutConfig<K,V> kafkaSpoutConfig, 
KafkaSpoutStreams kafkaSpoutStreams, KafkaTupleBuilder<K,V> tupleBuilder) {
    +        this.kafkaSpoutConfig = kafkaSpoutConfig;                 // Pass 
in configuration
    +        this.kafkaSpoutStreams = kafkaSpoutStreams;
    +        this.tupleBuilder = tupleBuilder;
    +    }
    +
    +    @Override
    +    public void open(Map conf, TopologyContext context, 
SpoutOutputCollector collector) {
    +        initialized = false;
    +
    +        // Spout internals
    +        this.collector = collector;
    +        maxRetries = kafkaSpoutConfig.getMaxTupleRetries();
    +
    +        // Offset management
    +        firstPollOffsetStrategy = 
kafkaSpoutConfig.getFirstPollOffsetStrategy();
    +        consumerAutoCommitMode = 
kafkaSpoutConfig.isConsumerAutoCommitMode();
    +
    +        if (!consumerAutoCommitMode) {     // If it is auto commit, no 
need to commit offsets manually
    +            timer = new Timer(kafkaSpoutConfig.getOffsetsCommitFreqMs(), 
500, TimeUnit.MILLISECONDS);
    +            acked = new HashMap<>();
    +        }
    +
    +        // Kafka consumer
    +        kafkaConsumer = new 
KafkaConsumer<>(kafkaSpoutConfig.getKafkaProps(),
    +                kafkaSpoutConfig.getKeyDeserializer(), 
kafkaSpoutConfig.getValueDeserializer());
    +        kafkaConsumer.subscribe(kafkaSpoutConfig.getSubscribedTopics(), 
new KafkaSpoutConsumerRebalanceListener());
    +        // Initial poll to get the consumer registration process going.
    +        // KafkaSpoutConsumerRebalanceListener will be called foloowing 
this poll upon partition registration
    +        kafkaConsumer.poll(0);
    +
    +        LOG.debug("Kafka Spout opened with the following configuration: 
{}", kafkaSpoutConfig.toString());
    --- End diff --
    
    Minor nit. The .toString() is not needed


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