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https://issues.apache.org/jira/browse/KAFKA-1137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13891201#comment-13891201
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Neha Narkhede commented on KAFKA-1137:
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Updated reviewboard https://reviews.apache.org/r/17649/
against branch trunk
> Problem of FetchRequest API
> ---------------------------
>
> Key: KAFKA-1137
> URL: https://issues.apache.org/jira/browse/KAFKA-1137
> Project: Kafka
> Issue Type: Bug
> Components: consumer
> Affects Versions: 0.8.0
> Reporter: aio
> Assignee: Neha Narkhede
> Attachments: KAFKA-1137_2014-02-04_13:04:23.patch
>
>
> We meet this problem when use Fetch API [0] in Node.js client [1]. The detail
> of the problem as follow:
> Send 2 FetchRequest in sequence through one long polling socket connection,
> each request hold one different topic (topic1 and topic2), topic2 is sent
> after topic1,MaxWaitTime set 30s, MinBytes set 1 byte. As the protocol doc
> said, when topic has new produced message, Kafka server would write back
> response to the socket, but the fact is Kafka server write response only when
> the last topic (topic2) has new message, otherwise we have to wait 30s to get
> the fetchResponse of topic1.
> I think Kafka server only approve the the MaxWaitTime in last FetchRequest of
> one socket connection, but why respond the new message in all topic when the
> last request have message.
> [0] :
> https://cwiki.apache.org/confluence/display/KAFKA/A+Guide+To+The+Kafka+Protocol#AGuideToTheKafkaProtocol-FetchRequest
> [1] : https://github.com/SOHU-Co/kafka-node
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