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Kafka, mail # dev - [jira] [Commented] (KAFKA-1180) WhiteList topic filter gets a NullPointerException on complex Regex


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[jira] [Commented] (KAFKA-1180) WhiteList topic filter gets a NullPointerException on complex Regex
"Joe Stein 2014-01-08, 01:32

    [ https://issues.apache.org/jira/browse/KAFKA-1180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13864964#comment-13864964 ]

Joe Stein commented on KAFKA-1180:
----------------------------------

Trunk patch = https://issues.apache.org/jira/secure/attachment/12621898/KAFKA-1180.patch

> WhiteList topic filter gets a NullPointerException on complex Regex
> -------------------------------------------------------------------
>
>                 Key: KAFKA-1180
>                 URL: https://issues.apache.org/jira/browse/KAFKA-1180
>             Project: Kafka
>          Issue Type: Bug
>          Components: consumer
>    Affects Versions: 0.8.0
>            Reporter: Jason Rosenberg
>            Assignee: Neha Narkhede
>             Fix For: 0.8.1
>
>         Attachments: KAFKA-1180.patch, KAFKA-1180.patch, KAFKA-1180_2013-12-22_01:24:57.patch
>
>
> We are needing to create a stream selector that essentially combines the logic of the BlackList and WhiteList classes (which is not easily exposed in the high-level consumer api).  That is, we want to select a topic that contains a certain prefix, as long as it doesn't also contain a secondary string.
> This should be easy to do with ordinary java Regex's, but we're running into some issues, trying to do this with the WhiteList class only.
> We have a pattern that uses negative lookahead, like this:
> "test-(?!bad\\b)[\\w]+"
> So this should select a topic like: "test-good", but exclude a topic like "test-bad", and also exclude a topic without the "test" prefix, like "foo-bar".
> Instead, what we see is a NullPointerException in the call to createMessageStreamsByFilter (after having previously sent a message to "test-good" followed by a message to "test-bad"):
> 21700 [ConsumerFetcherThread-group1_square-1a7ac0.local-1386869343370-dc19c7dc-0-1946108683] ERROR kafka.consumer.ConsumerFetcherThread  - [ConsumerFetcherThread-group1_square-1a7ac0.local-1386869343370-dc19c7dc-0-1946108683], Error due to
> kafka.common.KafkaException: error processing data for partition [test-bad,0] offset 0
> at kafka.server.AbstractFetcherThread$$anonfun$processFetchRequest$1$$anonfun$apply$mcV$sp$2.apply(AbstractFetcherThread.scala:137)
> at kafka.server.AbstractFetcherThread$$anonfun$processFetchRequest$1$$anonfun$apply$mcV$sp$2.apply(AbstractFetcherThread.scala:109)
> at scala.collection.immutable.Map$Map1.foreach(Map.scala:105)
> at kafka.server.AbstractFetcherThread$$anonfun$processFetchRequest$1.apply$mcV$sp(AbstractFetcherThread.scala:109)
> at kafka.server.AbstractFetcherThread$$anonfun$processFetchRequest$1.apply(AbstractFetcherThread.scala:109)
> at kafka.server.AbstractFetcherThread$$anonfun$processFetchRequest$1.apply(AbstractFetcherThread.scala:109)
> at kafka.utils.Utils$.inLock(Utils.scala:565)
> at kafka.server.AbstractFetcherThread.processFetchRequest(AbstractFetcherThread.scala:108)
> at kafka.server.AbstractFetcherThread.doWork(AbstractFetcherThread.scala:86)
> at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:51)
> Caused by: java.lang.NullPointerException
> at kafka.consumer.PartitionTopicInfo.enqueue(PartitionTopicInfo.scala:60)
> at kafka.consumer.ConsumerFetcherThread.processPartitionData(ConsumerFetcherThread.scala:49)
> at kafka.server.AbstractFetcherThread$$anonfun$processFetchRequest$1$$anonfun$apply$mcV$sp$2.apply(AbstractFetcherThread.scala:128)
> ... 9 more

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