Question - Explain NameNode recovery process.
Answer -
The NameNode recovery process involves the below-mentioned steps to make Hadoop cluster running:
- In the first step in the recovery process, file system metadata replica (FsImage) starts a new NameNode.
- The next step is to configure DataNodes and Clients. These DataNodes and Clients will then acknowledge new NameNode.
- During the final step, the new NameNode starts serving the client on the completion of last checkpoint FsImage loading and receiving block reports from the DataNodes.