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

    https://github.com/apache/flink/pull/3001#discussion_r112123765
  
    --- Diff: 
flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/FlinkKinesisConsumer.java
 ---
    @@ -194,26 +216,30 @@ public void run(SourceContext<T> sourceContext) 
throws Exception {
                // all subtasks will run a fetcher, regardless of whether or 
not the subtask will initially have
                // shards to subscribe to; fetchers will continuously poll for 
changes in the shard list, so all subtasks
                // can potentially have new shards to subscribe to later on
    -           fetcher = new KinesisDataFetcher<>(
    -                   streams, sourceContext, getRuntimeContext(), 
configProps, deserializer);
    +           fetcher = createFetcher(streams, sourceContext, 
getRuntimeContext(), configProps, deserializer);
     
                boolean isRestoringFromFailure = (sequenceNumsToRestore != 
null);
                fetcher.setIsRestoringFromFailure(isRestoringFromFailure);
     
                // if we are restoring from a checkpoint, we iterate over the 
restored
                // state and accordingly seed the fetcher with subscribed 
shards states
                if (isRestoringFromFailure) {
    -                   for (Map.Entry<KinesisStreamShard, SequenceNumber> 
restored : lastStateSnapshot.entrySet()) {
    +                   List<KinesisStreamShard> 
newShardsCreatedWhileNotRunning = fetcher.discoverNewShardsToSubscribe();
    +                   for (KinesisStreamShard shard : 
newShardsCreatedWhileNotRunning) {
                                fetcher.advanceLastDiscoveredShardOfStream(
    -                                   restored.getKey().getStreamName(), 
restored.getKey().getShard().getShardId());
    +                                   shard.getStreamName(), 
shard.getShard().getShardId());
    +
    +                           SequenceNumber startingStateForNewShard = 
lastStateSnapshot.containsKey(shard)
    +                                   ? lastStateSnapshot.get(shard)
    +                                   : 
SentinelSequenceNumber.SENTINEL_EARLIEST_SEQUENCE_NUM.get();
    --- End diff --
    
    Shouldn't the case always be 
`SentinelSequenceNumber.SENTINEL_EARLIEST_SEQUENCE_NUM.get()` for newly 
discovered shards?


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