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https://issues.apache.org/jira/browse/BEAM-8121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16920851#comment-16920851
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Alexey Romanenko commented on BEAM-8121:
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I guess it could be caused by fusion when messages, consumed by the same
consumer, will be processed on the same worker. Which runner do you use? Did
you try to use {{Reshuffle.viaRandomKey()}} to break a fusion?
> Messages are not distributed per machines when consuming from Kafka topic
> with 1 partition
> ------------------------------------------------------------------------------------------
>
> Key: BEAM-8121
> URL: https://issues.apache.org/jira/browse/BEAM-8121
> Project: Beam
> Issue Type: Bug
> Components: io-java-kafka
> Affects Versions: 2.14.0
> Reporter: TJ
> Priority: Major
>
> Messages are consumed from Kafka using KafkaIO. Each kafka topic contains
> only 1 partition. (That means that messages can be consumed only by one
> Consumer per 1 consumer group)
> When backlog of topic grows and system scales from 1 to X machines, all the
> messages seems to be executed on the same machine on which they are read.
> Due to that message throughput doesn't increase comparing X machines to 1
> machine. If one machine was reading 2K messages per s, X machines will be
> reading the same amount.
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