[jira] [Created] (FLINK-4574) Strengthen fetch interval implementation in Kinesis consumer

["Tzu-Li (Gordon) Tai (JIRA)" <ji...@apache.org>]

Tzu-Li (Gordon) Tai created FLINK-4574:
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             Summary: Strengthen fetch interval implementation in Kinesis consumer
                 Key: FLINK-4574
                 URL: https://issues.apache.org/jira/browse/FLINK-4574
             Project: Flink
          Issue Type: Improvement
          Components: Kinesis Connector
    Affects Versions: 1.1.0
            Reporter: Tzu-Li (Gordon) Tai
             Fix For: 1.2.0, 1.1.3


As pointed out by [~rmetzger], right now the fetch interval implementation in the {{ShardConsumer}} class of the Kinesis consumer can lead to much longer interval times than specified by the user, ex. say the specified fetch interval is {{f}}, it takes {{x}} to complete a {{getRecords()}} call, and {{y}} to complete processing the fetched records for emitting, than the actual interval between each fetch is actually {{f+x+y}}.

The main problem with this is that we can never guarantee how much time has past since the last {{getRecords}} call, thus can not guarantee that returned shard iterators will not have expired the next time we use them.

I propose to change to, per {{ShardConsumer}}, use a {{ScheduledExecutorService}} to do the fixed-interval fetching, and a separate blocking queue that collects the fetched records for emitting.



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