TJ created BEAM-8121:
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Summary: 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
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 machine to 1 machine.
If one machine was reading 2K messages per s, X machines will be reading the
same amount.
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