Distributed Databases Questions Medium
A distributed recovery protocol in distributed databases is a mechanism that ensures the consistency and availability of data in the event of failures or crashes in a distributed system. It is responsible for recovering the database to a consistent state after a failure has occurred.
The distributed recovery protocol typically involves a set of coordinated actions performed by multiple nodes in the distributed system. These actions include identifying the failed components, determining the state of the failed components, and restoring the system to a consistent state.
There are several techniques used in distributed recovery protocols, such as checkpointing, logging, and message passing. Checkpointing involves periodically saving the state of the system to stable storage, allowing recovery to start from a known consistent state. Logging involves recording all the changes made to the database in a log file, which can be used to replay the transactions and restore the system to a consistent state. Message passing is used to coordinate the recovery process among the nodes in the distributed system.
Overall, a distributed recovery protocol plays a crucial role in maintaining the integrity and availability of data in distributed databases, ensuring that the system can recover from failures and continue to operate reliably.