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

    https://github.com/apache/flink/pull/2509#discussion_r83165620
  
    --- Diff: 
flink-streaming-connectors/flink-connector-kafka-0.9/src/main/java/org/apache/flink/streaming/connectors/kafka/internal/Kafka09Fetcher.java
 ---
    @@ -202,13 +204,53 @@ public void run() {
                                }
                        }
     
    -                   // seek the consumer to the initial offsets
    +                   List<KafkaTopicPartition> partitionsWithNoOffset = new 
ArrayList<>();
                        for (KafkaTopicPartitionState<TopicPartition> partition 
: subscribedPartitions()) {
    -                           if (partition.isOffsetDefined()) {
    +                           if (!partition.isOffsetDefined()) {
    +                                   
partitionsWithNoOffset.add(partition.getKafkaTopicPartition());
    +                           } else {
                                        
consumer.seek(partition.getKafkaPartitionHandle(), partition.getOffset() + 1);
                                }
                        }
     
    +                   if (partitionsWithNoOffset.size() == 
subscribedPartitions().length) {
    +                           // if all partitions have no initial offsets, 
that means we're starting fresh
    +                           switch (startupMode) {
    +                                   case EARLIEST:
    +                                           LOG.info("Setting starting 
point as earliest offset for partitions {}", partitionsWithNoOffset);
    +
    +                                           for 
(KafkaTopicPartitionState<TopicPartition> partition : subscribedPartitions()) {
    +                                                   
consumer.seekToBeginning(partition.getKafkaPartitionHandle());
    +                                           }
    +                                           break;
    +                                   case LATEST:
    +                                           LOG.info("Setting starting 
point as latest offset for partitions {}", partitionsWithNoOffset);
    +
    +                                           for 
(KafkaTopicPartitionState<TopicPartition> partition : subscribedPartitions()) {
    +                                                   
consumer.seekToEnd(partition.getKafkaPartitionHandle());
    +                                           }
    +                                           break;
    +                                   default:
    +                                   case GROUP_OFFSETS:
    +                                           LOG.info("Using group offsets 
in Kafka of group.id {} as starting point for partitions {}",
    +                                                   
kafkaProperties.getProperty("group.id"), partitionsWithNoOffset);
    +                                           // don't need to do anything; 
the KafkaConsumer by default finds group offsets from Kafka brokers
    +                           }
    +                   } else if (partitionsWithNoOffset.size() > 0 && 
partitionsWithNoOffset.size() < subscribedPartitions().length) {
    --- End diff --
    
    @rmetzger after looking at 
https://issues.apache.org/jira/browse/FLINK-3037, do you think the proposed 
changes here (in the `Kafka09Fetcher`, overall) actually fixes that issue?


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