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https://issues.apache.org/jira/browse/KAFKA-2236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14633748#comment-14633748
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William Thurston commented on KAFKA-2236:
-----------------------------------------
https://github.com/apache/kafka/pull/86
> offset request reply racing with segment rolling
> ------------------------------------------------
>
> Key: KAFKA-2236
> URL: https://issues.apache.org/jira/browse/KAFKA-2236
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.8.2.0
> Environment: Linux x86_64, java.1.7.0_72, discovered using librdkafka
> based client.
> Reporter: Alfred Landrum
> Assignee: Jason Gustafson
> Priority: Critical
> Labels: newbie
>
> My use case with kafka involves an aggressive retention policy that rolls
> segment files frequently. My librdkafka based client sees occasional errors
> to offset requests, showing up in the broker log like:
> [2015-06-02 02:33:38,047] INFO Rolled new log segment for
> 'receiver-93b40462-3850-47c1-bcda-8a3e221328ca-50' in 1 ms. (kafka.log.Log)
> [2015-06-02 02:33:38,049] WARN [KafkaApi-0] Error while responding to offset
> request (kafka.server.KafkaApis)
> java.lang.ArrayIndexOutOfBoundsException: 3
> at kafka.server.KafkaApis.fetchOffsetsBefore(KafkaApis.scala:469)
> at kafka.server.KafkaApis.fetchOffsets(KafkaApis.scala:449)
> at kafka.server.KafkaApis$$anonfun$17.apply(KafkaApis.scala:411)
> at kafka.server.KafkaApis$$anonfun$17.apply(KafkaApis.scala:402)
> at
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
> at
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
> at scala.collection.immutable.Map$Map1.foreach(Map.scala:109)
> at
> scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
> at scala.collection.AbstractTraversable.map(Traversable.scala:105)
> at kafka.server.KafkaApis.handleOffsetRequest(KafkaApis.scala:402)
> at kafka.server.KafkaApis.handle(KafkaApis.scala:61)
> at kafka.server.KafkaRequestHandler.run(KafkaRequestHandler.scala:59)
> at java.lang.Thread.run(Thread.java:745)
> quoting Guozhang Wang's reply to my query on the users list:
> "I check the 0.8.2 code and may probably find a bug related to your issue.
> Basically, segsArray.last.size is called multiple times during handling
> offset requests, while segsArray.last could get concurrent appends. Hence
> it is possible that in line 461, if(segsArray.last.size > 0) returns false
> while later in line 468, if(segsArray.last.size > 0) could return true."
> http://mail-archives.apache.org/mod_mbox/kafka-users/201506.mbox/%3CCAHwHRrUK-3wdoEAaFbsD0E859Ea0gXixfxgDzF8E3%3D_8r7K%2Bpw%40mail.gmail.com%3E
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