[jira] [Commented] (KAFKA-3007) new Consumer should expose mechanism to fetch single message

["aarti gupta (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-3007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15062742#comment-15062742 ] 

aarti gupta commented on KAFKA-3007:
------------------------------------

Can we expose the following private api as a public api?

  private Map<TopicPartition, List<ConsumerRecord<K, V>>> pollOnce(long timeout) 

> new Consumer should expose mechanism to fetch single message 
> -------------------------------------------------------------
>
>                 Key: KAFKA-3007
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3007
>             Project: Kafka
>          Issue Type: Improvement
>          Components: consumer
>    Affects Versions: 0.9.0.0
>            Reporter: aarti gupta
>            Assignee: Neha Narkhede
>
> Currently, the consumer.poll(timeout)
> returns all messages that have not been acked since the last fetch
> The only way to process a single message, is to throw away all but the first message in the list
> This would mean we are required to fetch all messages into memory, and this coupled with the client being not thread-safe, (i.e. we cannot use a different thread to ack messages, makes it hard to consume messages when the order of message arrival is important, and a large number of messages are pending to be consumed)



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