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https://issues.apache.org/jira/browse/KAFKA-1180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13846920#comment-13846920
]
Jason Rosenberg commented on KAFKA-1180:
----------------------------------------
Here's some code which reproduces the issue. Assume zkConnect points to a
running zk cluster (and there's also a running kafka instance using the same
zkConnect), and also that kafka is running on localhost, and using using
'metadataport':
List<KeyedMessage<Integer, String>> data = ImmutableList.of(
new KeyedMessage<Integer, String>("test-topic", "test-message1"),
new KeyedMessage<Integer, String>("test-bad", "test-message2")),
String regex = "test-(?!bad\\b)[\\w]+",
Properties pProps = new Properties();
pProps.put("metadata.broker.list", "localhost:" + metadataport);
pProps.put("serializer.class", "kafka.serializer.StringEncoder");
ProducerConfig pConfig = new ProducerConfig(pProps);
Producer<Integer, String> producer = new Producer<Integer, String>(pConfig);
for (KeyedMessage<Integer, String> data : toSend) {
System.out.println("write");
producer.send(data);
}
producer.close();
Properties cProps = new Properties();
cProps.put("zookeeper.connect", zkConnect);
cProps.put("group.id", "group1");
cProps.put("auto.offset.reset", OffsetRequest.SmallestTimeString());
ConsumerConfig consumerConfig = new ConsumerConfig(cProps);
ConsumerConnector consumerConnector =
Consumer.createJavaConsumerConnector(consumerConfig);
List<KafkaStream<byte[], byte[]>> streams =
consumerConnector.createMessageStreamsByFilter(new Whitelist(regex), 1);
System.out.println("create streams");
> 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
>
> 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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