Github user koeninger commented on the issue:
https://github.com/apache/spark/pull/15387
If you're worried about it then accept the alternative PR I linked.
On Sun, Oct 9, 2016 at 11:37 PM, Shixiong Zhu <notificati...@github.com>
wrote:
> During the original implementation I had verified that calling pause kills
> the internal message buffer, which is one of the complications leading to
a
> cached consumer per partition.
>
> I observed the same behavior during my debug. I found that the first
> poll(0) will always send a request to prefetch the data. Pausing
> partitions just prevents the second poll(0) from returning anything at
> here: https://github.com/apache/kafka/blob/0.10.0.1/clients/
> src/main/java/org/apache/kafka/clients/consumer/
> internals/Fetcher.java#L527
>
> You dont want poll consuming messages, its not just about offset
> correctness, the driver shouldnt be spending time or bandwidth doing that.
>
> I think you have agreed that this is impossible via current KafkaConsumer
> APIs as well.
>
> However, the unknown thing to me is that if the first poll(0) will return
> something. I saw the first poll(0) will always send the fetching request,
> but I'm not sure that if it's possible that the response will be processed
> in the first poll(0). If this could happen, pausing partitions will not
> help in such case since it's called after the first poll(0). In addition,
> since it's unclear in javadoc, it could be changed in the future. That's
> why I decided to manually seek to the beginning in #15397
> <https://github.com/apache/spark/pull/15397>.
>
> â
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