Question - Explain Persistent, Ephemeral and Sequential Znodes.
Answer -
Persistent znodes: The default znode in ZooKeeper is the Persistent Znode. It permanently stays in the zookeeper server until any other clients leave it apart.
Ephemeral znodes: These are the temporary znodes. It is smashed whenever the creator client logs out of the ZooKeeper server. For example, assume client1 created eznode1. Once client1 logs out of the ZooKeeper server, the eznode1 gets destroyed.
Sequential znodes: Sequential znode is assigned a 10-digit number in numerical order at the end of its name. Assume client1 produced a sznode1. In the ZooKeeper server, the sznode1 will be named like this:
sznode0000000001.
If client1 generates another sequential znode, it will bear the following number in a sequence. So the subsequent sequential znode is 0000000002.