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https://issues.apache.org/jira/browse/BEAM-9439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17068938#comment-17068938
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Alexey Romanenko commented on BEAM-9439:
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Thank you for reporting this. I'd ask [~pawel.kaczmarczyk], who initially
worked on BEAM-2455, why {{getTotalBacklogBytes()}} was used in this case?
> KinesisReader does not report correct backlog statistics
> ---------------------------------------------------------
>
> Key: BEAM-9439
> URL: https://issues.apache.org/jira/browse/BEAM-9439
> Project: Beam
> Issue Type: Bug
> Components: io-java-kinesis
> Reporter: Sam Whittle
> Priority: Major
>
> The KinesisReader implementing KinesisIO reports backlog by implementing the
> UnboundedSource.getTotalBacklogBytes()
> method as opposed to the
> UnboundedSource.getSplitBacklogBytes()
> This value is supposed to represent the total backlog across all shards.
> This function is implemented by calling
> SimplifiedKinesisClient.getBacklogBytes with the watermark of the kinesis
> shards managed within the UnboundedReader instance. As this watermark may be
> further ahead than the watermark across all shards, this may miss backlog
> bytes.
> An additional concern is that the watermark is calculated using a
> WatermarkPolicy, which means that the watermark may be inconsistent to the
> kinesis timestamp for querying backlog.
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