Hi Oleg, Hmm -- from what I can tell, this isn't a Zookeeper communication issue. Nifi is able to connect into the Kafka brokers' Zookeeper cluster and retrieve the list of the kafka brokers to connect to. Seems, from the logs, to be a problem when attempting to consume from Kafka itself.
I'm guessing that the Kafka 0.9.0 client libraries just are not compatible with Kafka 0.8.2.1 so in order to use Nifi 0.5.0 with Kafka, the Kafka version must be >= 0.9.0. Any change Nifi could add backwards compatible support for Kafka 0.8.2.1 too? Let you choose which client library version, when setting up the GetKafka processor? -- Josh West <[email protected]> Bose Corporation On Sun, 2016-02-21 at 15:02 +0000, Oleg Zhurakousky wrote: Josh Also, keep in mind that there are incompatible property names in Kafka between the 0.7 and 0.8 releases. One of the change that went it was replacing “zk.connectiontimeout.ms” with “zookeeper.connection.timeout.ms”. Not sure if it’s related though, but realizing that 0.4.1 was relying on this property it’s value was completely ignored with 0.8 client libraries (you could actually see the WARN message to that effect) and now it is not ignored, so take a look and see if tinkering with its value changes something. Cheers Oleg On Feb 20, 2016, at 6:47 PM, Oleg Zhurakousky <[email protected]<mailto:[email protected]>> wrote: Josh The only change that ’s went and relevant to your issue is the fact that we’ve upgraded client libraries to Kafka 0.9 and between 0.8 and 0.9 Kafka introduced wire protocol changes that break compatibility. I am still digging so stay tuned. Oleg On Feb 20, 2016, at 4:10 PM, West, Joshua <[email protected]<mailto:[email protected]>> wrote: Hi Oleg and Joe, Kafka 0.8.2.1 Attached is the app log with hostnames scrubbed. Thanks for your help. Much appreciated. -- Josh West <[email protected]<mailto:[email protected]>> Bose Corporation On Sat, 2016-02-20 at 15:46 -0500, Joe Witt wrote: And also what version of Kafka are you using? On Feb 20, 2016 3:37 PM, "Oleg Zhurakousky" <[email protected]<mailto:[email protected]>> wrote: Josh Any chance to attache the app-log or relevant stack trace? Thanks Oleg On Feb 20, 2016, at 3:30 PM, West, Joshua <[email protected]<mailto:[email protected]>> wrote: Hi folks, I've upgraded from Nifi 0.4.1 to 0.5.0 and I am no longer able to use the GetKafka processor. I'm seeing errors like so: 2016-02-20 20:10:14,953 WARN [ConsumerFetcherThread-NiFi-sldjflkdsjflksjf_**SCRUBBED**-1455999008728-5b8c7108-0-0] kafka.consumer.ConsumerFetcherThread [ConsumerFetcherThread-NiFi-sldjflkdsjflksjf_**SCRUBBED**-1455999008728-5b8c7108-0-0], Error in fetchkafka.consumer.ConsumerFetcherThread$FetchRequest@7b49a642<mailto:kafka.consumer.ConsumerFetcherThread$FetchRequest@7b49a642>. Possible cause: java.lang.IllegalArgumentException ^ Note the hostname of the server has been scrubbed. My configuration is pretty generic, except that with Zookeeper we use a different root path, so our Zookeeper connect string looks like so: zookeeper-node1:2181,zookeeper-node2:2181,zookeeper-node3:2181/kafka Is anybody else experiencing issues? Thanks. -- Josh West <[email protected]<mailto:[email protected]>> Cloud Architect Bose Corporation <nifi-app.log.kafkaissues.bz2>
