I think a poorly implemented Producer in our dev environment may have triggered a bug in Kafka.
We are running 0.71. The error: 2012-07-11 12:20:09,034 - [main:Logging$class@58] - Starting Kafka server... 2012-07-11 12:20:09,046 - [main:Logging$class@58] - Loading log 'test-0' 2012-07-11 12:20:09,062 - [main:Logging$class@58] - Loading the last segment /var/lib/kafka/test-0/00000000000000000000.kafka in mutable mode, recovery false 2012-07-11 12:20:09,082 - [main:Logging$class@58] - Loading log 'marketing' 2012-07-11 12:20:09,088 - [main:Logging$class@96] - Fatal error during KafkaServerStable startup. Prepare to shutdown java.lang.StringIndexOutOfBoundsException: String index out of range: -1 at java.lang.String.substring(String.java:1937) at kafka.utils.Utils$.getTopicPartition(Utils.scala:558) at kafka.log.LogManager$$anonfun$4.apply(LogManager.scala:71) at kafka.log.LogManager$$anonfun$4.apply(LogManager.scala:65) at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:34) at scala.collection.mutable.ArrayOps.foreach(ArrayOps.scala:34) at kafka.log.LogManager.<init>(LogManager.scala:65) at kafka.server.KafkaServer.startup(KafkaServer.scala:58) at kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:34) at kafka.Kafka$.main(Kafka.scala:50) at kafka.Kafka.main(Kafka.scala) Other Symptoms: 1) We blew away /var/lib/kafka as our two brokers did not have the same contents but were both displaying this error on different parts. I saved this data from one system for future review if useful. Kafka still did not start. 2) I logged into ZooKeeper and the directory structure /brokers/topics/<topic>/<broker_id> had string values matching what should have been topics where <broker_id> goes. Manually clearing out /brokers/topics and restarting Kafka on both brokers did resolve the issue. Obviously there would have been data loss had this been a production environment. Is this a known issue where we simply are not using Kafka properly or have we accidentally made a mal-formed producer which did something the broker did not expect? We are not sure what the Producers we are working on may have done to cause this. We have two developers working on independent producers to integrate into our applications. -Jonathan
