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

    https://github.com/apache/flink/pull/1437#discussion_r46839322
  
    --- Diff: 
flink-streaming-connectors/flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaConsumer.java
 ---
    @@ -640,30 +642,38 @@ public PeriodicOffsetCommitter(long commitInterval, 
FlinkKafkaConsumer consumer)
                @Override
                public void run() {
                        try {
    +
                                while (running) {
                                        try {
                                                Thread.sleep(commitInterval);
                                                //  ------------  commit 
current offsets ----------------
     
                                                // create copy of current 
offsets
    -                                           long[] currentOffsets = 
Arrays.copyOf(consumer.lastOffsets, consumer.lastOffsets.length);
    -
    -                                           Map<TopicPartition, Long> 
offsetsToCommit = new HashMap<>();
    -                                           for (TopicPartition tp : 
(List<TopicPartition>)consumer.subscribedPartitions) {
    -                                                   int partition = 
tp.partition();
    -                                                   long offset = 
currentOffsets[partition];
    -                                                   long lastCommitted = 
consumer.commitedOffsets[partition];
    -
    +                                           HashMap<KafkaTopicPartition, 
Long> currentOffsets = (HashMap<KafkaTopicPartition, Long>) 
consumer.lastOffsets.clone();
    +
    +                                           Map<KafkaTopicPartition, Long> 
offsetsToCommit = new HashMap<>();
    +                                           for (KafkaTopicPartition tp : 
(List<KafkaTopicPartition>)consumer.subscribedPartitions) {
    --- End diff --
    
    A bit unclean to cast here from `List<KafkaTopicPartitionLeader>` to 
`List<KafkaTopicPartition>`. Why not simply iterate with the 
`KafkaTopicPartitionLeader` type?


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