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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