[FLINK-2325] PersistentKafkaSource throws ArrayIndexOutOfBoundsException if reading from a topic that is created after starting the Source

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.9
• Fix Version/s: 0.9.1, 0.10.0
• Component/s: Connectors / Kafka
• Assignee: Robert Metzger
• Reporter: Rico Bergmann
• Created: 07/Jul/15 09:48
• Updated: 22/Sep/15 10:04
• Resolved: 22/Sep/15 10:04

Description

I'm creating a PersistentKafkaSource reading from a specified topic from Kafka, that is at the time the PersistentKafkaSource is started (via open(.)) not yet present. That's why the number of partitions, that is read in the open(.) function is 0, which leads to arrays of length 0 (lastOffsets and committedOffsets).
May be it is better to check, whether numberOfPartitions returns 0 and if so, to take the default number of partitions from Kafka config?

Stacktrace:
java.lang.ArrayIndexOutOfBoundsException: 0
at org.apache.flink.streaming.connectors.kafka.api.persistent.PersistentKafkaSource.run(PersistentKafkaSource.java:180)
at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:49)
at org.apache.flink.streaming.runtime.tasks.SourceStreamTask.invoke(SourceStreamTask.java:55)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:559)
at java.lang.Thread.run(Thread.java:745)