I am using Kafka client library comes with Kafka 0.11.0.1. I noticed that using kafkaconsumer does not need to configure zookeeper anymore. Does that mean zookeep server will automatically be located by the kafka bootstrap server?
Since Kafka 0.9 the KafkaConsumer implementation stores offsets commit and consumer group information in Kafka brokers themselves. This eliminates the zookeeper dependency and increases the scalability of the consumers.
Related
So my question is this: If i have a server running Kafka (And zookeeper), and another machine only consuming messages, does the consumer machine need to run zookeeper too? Or does the server take care of all?
No.
Role of Zookeeper in Kafka is:
Broker registration: (cluster membership) with heartbeats mechanism to keep the list current
Storing topic configuration: which topics exist, how many partitions each
has, where are the replicas, who is the preferred leader, list of ISR for
partitions
Electing controller: The controller is one of the brokers and is responsible for maintaining the leader/follower relationship for all the partitions.
So Zookeeper is required only for kafka broker. There is no need to have Zookeper on the producer or consumer side.
The consumer does not need zookeeper
You have not mentioned which version of Kafka or the clients you're using.
Kafka consumers using 0.8 store their offsets in Zookeeper, so it is required for them. However, no, you would not run Zookeeper and consumers on the same server
From 0.9 and later, clients are separate from needing it (unless you want to manage external connections to Zookeeper on your own for storing data)
Apache MetaModel kafka consumer not working for zookeepers offset storage.
I am using Apache MetaModel 5.1 and kafka version 0.10.2.1. I am facing issue with kafka consumer(metamodel internal consumer) as its not consuming any messages from topic
my test environment kafka offset storage is zookeeper. when I tried with changing offset storage to KAFKA(on different environment), consumer worked fine.
As of now I don't want to change offset storage to kafka so is there any other way to fix this issue on Apache MetaModel kafka consumer side?
As from the latest consumer versions of Kafka, the consumers aren't dependent on ZooKeeper. But "https://kafka.apache.org/" says Kafka requires Zookeeper, so start zookeeper server. why is it so?. Once a topic has been created, even though I terminate Zookeeper it works. So the purpose of Zookeeper is only for creating a Topic? If so why not move creating Topic also to be independent of zookeeper
Kafka topics (still) require Zookeeper for electing a leader, communicating server failure, and storing the list of topics, plus some extra metadata such as replica location and topic configurations.
Kafka Wiki - How does Kafka depend on Zookeeper
Confluent and the Kafka community are trying to move away from the Zookeeper dependency. For example, the Confluent Schema Registry can now use Kafka for leader election. Related blog from Confluent - https://www.confluent.io/blog/how-to-prepare-for-kip-500-kafka-zookeeper-removal-guide/
And in Confluent Cloud, Amazon MSK, and other hosted Kafka offerings, you generally have no access to Zookeeper at all.
The consumers are not dependent on Zookeeper as they are client-side. Likewise with the producers.
Zookeeper is required for the Kafka brokers themselves. Kafka brokers use Zookeeper to co-ordinate and synchronise themselves.
The old version suggests that consumer connect zookeeper, and the new version suggests linking broker? A netizen from a community replied to me that the old version of topic's offset is ZK, and the new version is Kafka itself. Is this the answer to this answer?
Older versions of Kafka i.e before 0.9 version store offsets with Zookeeper.
Newer version of Kafka, store offsets in an internal Kafka topic called __consumer_offsets.
The newer version still provides the feasibility to store offsets with Zookeeeper.
With this the consumers can now only talk to the Brokers and does not need to rely on Zookeeper.
If there are many consumers simultaneously reading from Kafka, the read write load on ZooKeeper may exceed its capacity, making ZooKeeper a bottleneck.
check this for more information
https://github.com/SOHU-Co/kafka-node/issues/502
I have setup Apache Kafka and confirmed that producers and consumers work on the localhost.
How to set up Kafka so that:
multiple producers feed messages into a broker on a network computer
many consumers on the network can consume the messages from the broker
I noticed the following line: zookeeper.connect=localhost:2181 in server.properties which is used to start the kafka server. If this is the setting, is the setting for what addresses it listens to or is it specifying the server's address/port is on the network?
The zookeeper is used internally by Kafka to coordinate the cluster (leader election). In versions of Kafka before 0.8, ZK was the exclusive store for consumer offsets (what is consumed so far), but from 0.8.1, I think, you can choose whether to store offsets in ZK or in a special Kafka topic called __consumer_offsets.
What you're interested in is advertised.host.name and advertised.port settings that Kafka exposes to clients (or "what addresses it listens to", as you put it).
It is the name of the zookeeper server that Kafka connects to. The documentation for the Broker configuration can be found here http://kafka.apache.org/documentation.html#brokerconfigs