[jira] [Created] (FLINK-11164) Refreshing expired shard iterator fails if no records were retrieved from shard since ShardConsumer was started in FlinkKinesisConsumer

[Shang Yuanchun (Jira)]

Tzu-Li (Gordon) Tai created FLINK-11164:
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             Summary: Refreshing expired shard iterator fails if no records were retrieved from shard since ShardConsumer was started in FlinkKinesisConsumer
                 Key: FLINK-11164
                 URL: https://issues.apache.org/jira/browse/FLINK-11164
             Project: Flink
          Issue Type: Bug
          Components: Kinesis Connector
            Reporter: Tzu-Li (Gordon) Tai


Originally reported by: [http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Encountered-the-following-Expired-Iterator-exception-in-getRecords-using-FlinkKinesisConsumer-td25093.html]

In {{ShardConsumer.getRecords(...)}}, we catch any expired iterator exceptions so that in the case no data was written to the Kinesis shard, we last iterator which eventually expires doesn't just fail the job, by doing:
`

shardItr = kinesis.getShardIterator(subscribedShard, ShardIteratorType.AFTER_SEQUENCE_NUMBER.toString(), lastSequenceNum.getSequenceNumber());

`.

The problem is that, if absolutely no records were retrieved at all from the shard since the {{ShardConsumer}} was started, then {{lastSequenceNumber}} would still be a sentinel value (e.g. `EARLIEST_SEQUENCE_NUMBER`, `LATEST_SEQUENCE_NUMBER`, etc.) instead of an actual value. This isn't recognized by Kinesis, and would fail the job.



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