Zookeeper easy
Which nodes in a ZooKeeper cluster can handle 'Read' requests?
- A Any node in the cluster (Leader or Follower).
- B Only the Leader.
- C Only the nodes with SSDs.
- D Only the Observers.
Answer: A. Any node in the cluster (Leader or Follower).
This makes ZooKeeper extremely fast for read-heavy workloads (typical ratio 10:1 reads vs writes). You can scale read throughput by adding more Followers.
One system design question a day, with spaced repetition so the ones you miss come back.
Get the appRelated questions
- What is the primary technical function of a ZooKeeper 'Watch'?
- A system administrator increases `jute.maxbuffer` to 5MB on every ZooKeeper server to store large configuration objects. However, write operations larger than 1MB still fail. What is the most likely cause?
- By default, `forceSync` is enabled. If you disable it, what trade-off are you making?
- If the specific ZooKeeper node a client is connected to crashes, what should the client do?
- Which cluster configuration has *worse* availability: A 3-node cluster or a 4-node cluster? (Assuming simple majority quorum)
- According to the CAP Theorem, how is ZooKeeper classified?