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)
