Major Description
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