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

    https://github.com/apache/flink/pull/2687#discussion_r105621324
  
    --- Diff: 
flink-connectors/flink-connector-kafka-base/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaConsumerBase.java
 ---
    @@ -558,11 +629,31 @@ protected static void 
initializeSubscribedPartitionsToStartOffsets(
                        List<KafkaTopicPartition> kafkaTopicPartitions,
                        int indexOfThisSubtask,
                        int numParallelSubtasks,
    -                   StartupMode startupMode) {
    +                   StartupMode startupMode,
    +                   Map<KafkaTopicPartition, Long> specificStartupOffsets) {
     
                for (int i = 0; i < kafkaTopicPartitions.size(); i++) {
                        if (i % numParallelSubtasks == indexOfThisSubtask) {
    -                           
subscribedPartitionsToStartOffsets.put(kafkaTopicPartitions.get(i), 
startupMode.getStateSentinel());
    +                           if (startupMode != 
StartupMode.SPECIFIC_OFFSETS) {
    +                                   
subscribedPartitionsToStartOffsets.put(kafkaTopicPartitions.get(i), 
startupMode.getStateSentinel());
    +                           } else {
    +                                   if (specificStartupOffsets == null) {
    +                                           throw new 
IllegalArgumentException(
    +                                                   "Startup mode for the 
consumer set to " + StartupMode.SPECIFIC_OFFSETS +
    +                                                           ", but no 
specific offsets were specified");
    +                                   }
    +
    +                                   KafkaTopicPartition partition = 
kafkaTopicPartitions.get(i);
    +
    +                                   Long specificOffset = 
specificStartupOffsets.get(partition);
    --- End diff --
    
    What happens when the offset is negative or any other invalid number?
    Is that handled by the individual fetchers?


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