Error while deploying topology on storm cluster
java,logging,storm,apache-kafka,kafka
Solved this by adding log4j-over-slf4j-1.6.6.jar in my storm library.
Kafka partitions meaning
configuration,partitioning,partition,kafka
When we create high level consumer, we pass not partition number, but intended number of consuming threads(streams). The answer is yes, they can be consumed by 1 consumer. (If that consumer subscribed to both topics) Consumer just opens N streams/intended number of consuming threads (you pass that as a parameter!)....
kafka log.retention.hours inconsistency in multiple brokers
apache-kafka,distributed-system,kafka
One of the basic assumptions in the design of Kafka is that the brokers in a cluster will, with very few exceptions (e.g. port), have the same configuration as described in this Kafka Improvement Proposal. As a result, the scenario with inconsistent configurations that you have described in your question...
With bottledwater-pg, how to read data by a Python consumer?
The Avro-encoded messages that Bottled Water publishes to Kafka are prefixed with a 5-byte header. The first byte is always zero (reserved for future use), and the next 4 bytes are a big-endian 32-bit number indicating the ID of the schema. In your example you've hard-coded the schema in the...
is kafka producer capable of sending multiple messages in a list?
The producer under javaapi is the old implementation which has been superseded by the new one in clients. The new producer implementation can still batch messages together but will do this in the background and when doing a call to send you'll get a future back for every message. Batch...
Wildfly Kafka clients module javax/management/JMException not found
I think you need an additional dependency: <dependencies> <module name="javax.api"/> ... </dependencies> ...
Fail to export from voltdb to kafka
This is purely an issue related to Kafka setting. In the setting, there is a commented setting: advertised.host.name=something just need to replace "something" to the IP address of the server in which Kafka is running. This is found at Kafka - Unable to send a message to a remote server...
Kafka MySQL as Consumer
You can't do this directly AFAIK. Kafka does not provide facilities to mirror its data to different datastores. You'll something else to pull the messages out of Kafka and write their contents to SQL. A common pattern is use Storm to pull the data out of Kafka, then to write...
scala + kafka does not send message with id
Well, I just found out the problem. Actually you have two options for Encoder. The DefaultEncoder and the StringEncoder. I was trying to send my id as String and the message as byte array using the default encoder. Looking at the Encoder.scala, you can see the DefaultEncoder implementation and the...
Apache Kafka is JMS api?
No, Kafka is different from JMS systems such as ActiveMQ. see ActiveMQ vs Apollo vs Kafka Kafka has less features than ActiveMQ, as the stress has been put on performances. So before migrating, check that the features you use in AMQ are in Kafka. However, there is an open suggestion...
Should Apache Kafka and Hadoop be installed seperatedly (on a diffrent cluster)?
Kafka is a distributed publish-subscribe messaging system that is designed to be fast, scalable, and durable. You can go for Kafka if the data will be consumed by multiple applications. Hope this link helps.. it has some info in it http://www.datanami.com/2014/12/02/kafka-run-natively-hadoop/...
Can I achieve ordered processing with multiple consumers in Kafka?
Yes, you can do this with Kafka. But you shouldn't do it quite the way you've described. Kafka already supports semantic partitioning within a topic if you provide a key with each message. In this case you'd create a topic with 20 partitions, then make the key for each message...
What exactly IS Kafka Rebalancing?
apache,apache-kafka,kafka-consumer-api,kafka
When a new consumer joins a consumer group the set of consumers attempt to "rebalance" the load to assign partitions to each consumer. If the set of consumers changes while this assignment is taking place the rebalance will fail and retry. This setting controls the maximum number of attempts before...
how to get kafka to consume http streaming data on spring xd runtime?
spring,spring-xd,http-streaming,kafka
I am trying to do this because I have streaming data coming over http which I want to manage with kafka message bus. If you use kafka as the messagebus (after setting transport), then the stream like "http | log" will have the http messages flow through kafka messagebus....
Kafka QuickStart, advertised.host.name gives kafka.common.LeaderNotAvailableException
So to summarize, the solution to this was to add a route via NAT so that the machine can access its own external IP address. Zookeeper uses the address it finds in advertised.host.name both to tell clients where to find the broker as well as to communicate with the broker...