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https://issues.apache.org/jira/browse/FLINK-5075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15686816#comment-15686816
 ] 

ASF GitHub Bot commented on FLINK-5075:
---------------------------------------

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

    https://github.com/apache/flink/pull/2822#discussion_r89119126
  
    --- Diff: 
flink-streaming-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/proxy/KinesisProxy.java
 ---
    @@ -283,7 +285,7 @@ public String getShardIterator(KinesisStreamShard 
shard, String shardIteratorTyp
         * @param startShardId which shard to start with for this describe 
operation (earlier shard's infos will not appear in result)
         * @return the result of the describe stream operation
         */
    -   private DescribeStreamResult describeStream(String streamName, String 
startShardId) throws InterruptedException {
    +   private DescribeStreamResult describeStream(String streamName, 
@Nullable String startShardId) throws InterruptedException {
    --- End diff --
    
    Only Kinesis does. Kinesalite incorrectly ignores `startShardId`.
    It's marked `Nullable` here, because on fresh startups this method will be 
called with a `null` as the start ID (on startup there will be no shard Id to 
start from).


> Kinesis consumer incorrectly determines shards as newly discovered when 
> tested against Kinesalite
> -------------------------------------------------------------------------------------------------
>
>                 Key: FLINK-5075
>                 URL: https://issues.apache.org/jira/browse/FLINK-5075
>             Project: Flink
>          Issue Type: Bug
>          Components: Kinesis Connector
>            Reporter: Tzu-Li (Gordon) Tai
>            Assignee: Tzu-Li (Gordon) Tai
>
> A user reported that when our Kinesis connector is used against Kinesalite 
> (https://github.com/mhart/kinesalite), we're incorrectly determining already 
> found shards as newly discovered:
> http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Subtask-keeps-on-discovering-new-Kinesis-shard-when-using-Kinesalite-td10133.html
> I suspect the problem to be the mock Kinesis API implementations of 
> Kinesalite doesn't completely match with the official AWS Kinesis behaviour.



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