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https://issues.apache.org/jira/browse/BEAM-2185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16756369#comment-16756369
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Alexey Romanenko commented on BEAM-2185:
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[~rangadi] I agree that rerunning batch processing tasks should be idempotent.
So, it can probably mean that we should not allow to use BoundedSource together
with {{commitOffsetsInFinalize()}} in KafkaIO to avoid such confusions. In the
same time, what's about {{enable.auto.commit=true}}? Is it the similar case of
using KafkaIO in bounded mode and it should be avoided as well?
> KafkaIO bounded source
> ----------------------
>
> Key: BEAM-2185
> URL: https://issues.apache.org/jira/browse/BEAM-2185
> Project: Beam
> Issue Type: New Feature
> Components: io-java-kafka
> Reporter: Raghu Angadi
> Priority: Major
>
> KafkaIO could be a useful source for batch applications as well. It could
> implement a bounded source. The primary question is how the bounds are
> specified.
> One option : Source specifies a time period (say 9am-10am), and KafkaIO
> fetches appropriate start and end offsets based on time-index in Kafka. This
> would suite many batch applications that are launched on a scheduled.
> Another option is to always read till the end and commit the offsets to
> Kafka. Handling failures and multiple runs of a task might be complicated.
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