[jira] [Created] (KAFKA-698) broker may expose uncommitted data to a consumer

["Jun Rao (JIRA)" <ji...@apache.org>]

Jun Rao created KAFKA-698:
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             Summary: broker may expose uncommitted data to a consumer
                 Key: KAFKA-698
                 URL: https://issues.apache.org/jira/browse/KAFKA-698
             Project: Kafka
          Issue Type: Bug
          Components: core
    Affects Versions: 0.8
            Reporter: Jun Rao
            Priority: Blocker


We saw the following error in the log during testing. The problem seems to be that when the high watermark was at offset 39021, the broker incorrectly exposed an uncommitted message (at offset 39022) to the client. This doesn't always happen, but can happen when certain conditions are met, which I should explain in the comments.

2013/01/11 00:54:42.059 ERROR [KafkaApis] [kafka-request-handler-2] [kafka] []  [KafkaApi-277] error when processing request (service_metrics,2,39022,2000000)
java.lang.IllegalArgumentException: Attempt to read with a maximum offset (39021) less than the start offset (39022).
        at kafka.log.LogSegment.read(LogSegment.scala:105)
        at kafka.log.Log.read(Log.scala:386)
        at kafka.server.KafkaApis.kafka$server$KafkaApis$$readMessageSet(KafkaApis.scala:369)
        at kafka.server.KafkaApis$$anonfun$kafka$server$KafkaApis$$readMessageSets$1.apply(KafkaApis.scala:327)
        at kafka.server.KafkaApis$$anonfun$kafka$server$KafkaApis$$readMessageSets$1.apply(KafkaApis.scala:323)
        at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:206)
        at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:206)
        at scala.collection.immutable.Map$Map1.foreach(Map.scala:105)
        at scala.collection.TraversableLike$class.map(TraversableLike.scala:206)
        at scala.collection.immutable.Map$Map1.map(Map.scala:93)
        at kafka.server.KafkaApis.kafka$server$KafkaApis$$readMessageSets(KafkaApis.scala:323)
        at kafka.server.KafkaApis$$anonfun$maybeUnblockDelayedFetchRequests$2.apply(KafkaApis.scala:165)
        at kafka.server.KafkaApis$$anonfun$maybeUnblockDelayedFetchRequests$2.apply(KafkaApis.scala:164)
        at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:57)
        at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:43)
        at kafka.server.KafkaApis.maybeUnblockDelayedFetchRequests(KafkaApis.scala:164)
        at kafka.server.KafkaApis$$anonfun$handleProducerRequest$3.apply(KafkaApis.scala:186)
        at kafka.server.KafkaApis$$anonfun$handleProducerRequest$3.apply(KafkaApis.scala:185)
        at scala.collection.immutable.Map$Map1.foreach(Map.scala:105)
        at kafka.server.KafkaApis.handleProducerRequest(KafkaApis.scala:185)
        at kafka.server.KafkaApis.handle(KafkaApis.scala:58)
        at kafka.server.KafkaRequestHandler.run(KafkaRequestHandler.scala:41)
        at java.lang.Thread.run(Thread.java:619)


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