This typically only happens when the consumerConnector is shut down. Are you restarting the consumerConnector often?
Thanks, Jun On Tue, Jun 25, 2013 at 9:40 AM, Hargett, Phil < phil.harg...@mirror-image.com> wrote: > Seeing this exception a LOT (3-4 times per second, same log topic). > > I'm using external code to feed data to about 50 different log topics over > a cluster of 3 Kafka 0.8 brokers. There are 3 ZooKeeper instances as well, > all of this is running on EC2. My application creates a high-level > consumer (1 per topic) to consumer data from each and do further processing. > > The problem is this exception is in the high-level consumer, so my code > has no way of knowing that it's become stuck. > > This exception does not always appear, but as far as I can tell, once this > happens, the only cure is to restart my application's process. > > I saw this in 0.8 built from source about 1 week ago, and also am seeing > it today after pulling the latest 0.8 sources and rebuilding Kafka. > > Thoughts? > > Failed to find leader for Set([topic6,0]): java.lang.NullPointerException > at org.I0Itec.zkclient.ZkClient$2.call(ZkClient.java:416) > at org.I0Itec.zkclient.ZkClient$2.call(ZkClient.java:413) > at > org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:675) > at org.I0Itec.zkclient.ZkClient.getChildren(ZkClient.java:413) > at org.I0Itec.zkclient.ZkClient.getChildren(ZkClient.java:409) > at > kafka.utils.ZkUtils$.getChildrenParentMayNotExist(ZkUtils.scala:438) > at kafka.utils.ZkUtils$.getAllBrokersInCluster(ZkUtils.scala:75) > at > kafka.consumer.ConsumerFetcherManager$LeaderFinderThread.doWork(ConsumerFetcherManager.scala:63) > at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:51) >
