Zookeeper

Zookeeper manages Brokers, keeps a list of them
Zookeeper helps in performing Partition Leader election for Partitions
Zookeeper by design operates with an odd number of servers
Zookeeper has a leader (writes) the rest of the servers are followers (reads)
Zookeeper does note store consumer offsets

Consumer offsets are stored in a Kafka topic __consumer_offsets, and the Schema Registry stored schemas in the _schemas topic.

References

Flashcards

Zookeeper manages:: Brokers and keeps a list of them

Zookeeper helps in performing:: Partition Leader election for Partitions

Zookeeper by design operates with an odd number of servers
Zookeeper has a leader, the rest of the servers are followers

T/F Zookeeper stores the consumer offset:: false

What information isn't stored inside of Zookeeper (Choose 2)?

• ACL Information
• Broker registration info
• Consumer offset
• Controller registration
• Schema Registry schemas
  ?
• Consumer offset
• Schema Registry schemas

Where are the dynamic configurations for a topic stored?:: In Zookeeper

A Zookeeper ensemble contains 3 servers. Over which ports the members of the ensemble should be able to communicate in default configuration?:: 2181 - client port, 2888 - peer port, 3888 - leader port

Kafka uses Apache Zookeeper to manage consensus. Zookeeper acts as a distributed consensus manager. Zookeeper stores information about:

• ACLs
• Failure detection and recovery
• Cluster Management
• Controllers
• All of the above
  ?
• All of the above

You have a Zookeeper cluster that needs to be able to withstand the loss of 2 servers and still be able to function. What size should your Zookeeper cluster have?:: Your Zookeeper cluster needs to have an odd number of servers, and must maintain a majority of servers up to be able to vote. Therefore, a 2N+1 zookeeper cluster can survive to N zookeeper being down, so here the right answer is N=2, 2*N+1=5

A Zookeeper ensemble contains 5 servers. What is the maximum number of servers that can go missing and the ensemble still run?:: majority consists of 3 zk nodes for 5 nodes zk cluster, so 2 can fail

A Zookeeper configuration has tickTime of 2000, initLimit of 20 and syncLimit of 5. What's the timeout value for followers to connect to Zookeeper?:: tick time is 2000 ms, and initLimit is the config taken into account when establishing a connection to Zookeeper, so the answer is 2000 * 20 = 40000 ms = 40s

What is the recommended number of nodes in a ZooKeeper ensemble?:: 5