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https://issues.apache.org/jira/browse/FLINK-6349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17789436#comment-17789436
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Hong Liang Teoh commented on FLINK-6349:
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This will be addressed by the new FLIP-27 based KinesisSource - tracked by
FLINK-32218.
> Enforce per-subtask record ordering on resharding for FlinkKinesisConsumer
> --------------------------------------------------------------------------
>
> Key: FLINK-6349
> URL: https://issues.apache.org/jira/browse/FLINK-6349
> Project: Flink
> Issue Type: Improvement
> Components: Connectors / Kinesis
> Reporter: Tzu-Li (Gordon) Tai
> Priority: Major
> Labels: auto-deprioritized-major, auto-deprioritized-minor
>
> As described in FLINK-6316, currently the Kinesis consumer does not provide
> any ordering guarantees when resharding occurs.
> While this cannot be enforced globally (i.e. if a merged / split shard's
> child shard ends up in a different subtask, we cannot do any coordination for
> ordering guarantee), we can definitely enforce this locally for each subtask.
> Simply put, we can still locally enforce ordering by making sure that
> discovered child shards are consumed only after any of its parent shards that
> were on the same subtask are fully consumed.
> To do this, we would also need to add "parent shard" information to
> {{KinesisStreamShard}} (Flink's representation of Kinesis shards).
> This would be directly beneficial for per-shard watermarks (FLINK-5697) to
> retain per-shard time characteristics after a reshard, and therefore can be
> seen as a prerequisite.
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