[jira] [Created] (KAFKA-4305) Possible race condition in log segment truncation and Kafka Request Handler

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

Hari created KAFKA-4305:
---------------------------

             Summary: Possible race condition in log segment truncation and Kafka Request Handler 
                 Key: KAFKA-4305
                 URL: https://issues.apache.org/jira/browse/KAFKA-4305
             Project: Kafka
          Issue Type: Bug
          Components: core
    Affects Versions: 0.10.0.1
            Reporter: Hari
            Priority: Minor


We started to observe this trace in our Kafka Server logs after migration to 0.10.0.1

{code}
[2016-10-16 20:55:04,825] ERROR [KafkaApi-303] Error while responding to offset request (kafka.server.KafkaApis)
java.lang.NullPointerException
        at kafka.server.KafkaApis.fetchOffsetsBefore(KafkaApis.scala:585)
        at kafka.server.KafkaApis.fetchOffsets(KafkaApis.scala:573)
        at kafka.server.KafkaApis$$anonfun$27.apply(KafkaApis.scala:530)
        at kafka.server.KafkaApis$$anonfun$27.apply(KafkaApis.scala:521)
        at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
        at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
        at scala.collection.Iterator$class.foreach(Iterator.scala:727)
        at scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
        at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
        at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
        at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
        at scala.collection.AbstractTraversable.map(Traversable.scala:105)
        at kafka.server.KafkaApis.handleOffsetRequest(KafkaApis.scala:521)
        at kafka.server.KafkaApis.handle(KafkaApis.scala:78)
        at kafka.server.KafkaRequestHandler.run(KafkaRequestHandler.scala:60)
        at java.lang.Thread.run(Thread.java:745)
{code}

From a quick investigation, I suspect this could happen because of race condition with log segment truncation and Kafka request handler ?

Any thoughts ?



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