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https://issues.apache.org/jira/browse/KAFKA-1779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14260751#comment-14260751
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Guozhang Wang commented on KAFKA-1779:
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[~nehanarkhede] Is this really an issue? I thought the scenario described here
is expected.
> FetchRequest.maxWait has no effect
> ----------------------------------
>
> Key: KAFKA-1779
> URL: https://issues.apache.org/jira/browse/KAFKA-1779
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 0.8.2
> Reporter: Magnus Vojbacke
> Priority: Minor
>
> Setting the maxWait field in a kafka.api.FetchRequest does not appear to
> have any effect. Whereas my assumption is: If I send a fetch request for
> messages after offset X for a partition where there are currently no messages
> with offsets after X, I would expect that a Fetch request built with the
> maxWait option should block on the broker side for $maxWait milliseconds for
> a new message to arrive.
> Currently, the request seems to return an empty result immediately. As a
> result, our client is forced to manually sleep on each fetch request that
> returns empty results.
> On the mailing list, it was stated that this bug should be fixed in 0.8.2,
> but I'm still seeing this issue on 0.8.2-beta.
> {code}
> // Chose a suitable topic / partition / lead broker combination
> val host = ???
> val port = ???
> val topic = ???
> val partition = ???
> val cons = new SimpleConsumer(host, port, 50000000, 50000000, "my-id")
> val topicAndPartition = new TopicAndPartition(topic, partition)
> println(topicAndPartition)
> val requestInfo = Map(topicAndPartition -> new
> PartitionOffsetRequestInfo(kafka.api.OffsetRequest.LatestTime, 1))
> println(requestInfo)
> val request = new OffsetRequest(requestInfo)
> println(request)
> val response: OffsetResponse = cons.getOffsetsBefore(request)
> println("code=" +
> response.partitionErrorAndOffsets(topicAndPartition).error)
> println(response)
> val offset =
> response.partitionErrorAndOffsets(topicAndPartition).offsets(0)
> val req = new FetchRequestBuilder().clientId("my-id").addFetch(topic,
> partition, offset, 500000).maxWait(10000)
> // The following requests appear to return within a few hundred milliseconds
> of
> // eachother, but my assumption is that maxWait 10000 milliseconds should
> // make each request block for at least 10000 milliseconds before returning an
> // empty result.
> println(System.currentTimeMillis + " " + cons.fetch(req.build()))
> println(System.currentTimeMillis + " " + cons.fetch(req.build()))
> println(System.currentTimeMillis + " " + cons.fetch(req.build()))
> {code}
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