12 Questions
What is the key difference between synchronous and asynchronous replication?
In synchronous replication, the leader must wait for confirmation that the data has been replicated to at least one follower, while in asynchronous replication the leader does not have to wait.
What is the main disadvantage of using synchronous replication?
If the synchronous follower does not respond, the write cannot be processed and the leader must wait until the synchronous replica is available again.
What is the advantage of asynchronous replication?
Asynchronous replication allows the leader to continue processing writes even if all its followers have fallen behind.
What is the purpose of the 'semi-synchronous' replication configuration described in the text?
To increase the availability of the system by automatically switching to an asynchronous follower if the synchronous one fails.
What are the two options described in the text that are not sufficient for setting up a new follower?
Just copying data files from one node to another and locking the database.
What is the recommended approach described in the text for setting up a new follower without downtime?
Take a consistent snapshot of the leader's database, copy the snapshot to the follower, and then have the follower request the log of changes since the snapshot was taken.
What is the main purpose of replication in a distributed system?
To maintain data consistency and availability
Which algorithm does the text mention as an approach for replicating changes between nodes?
Leaderless replication
What is the role of followers in leader-based replication?
Applying all the writes from the replication log in the order processed by the leader
Which databases implement the leader-based replication approach according to the text?
MySQL and PostgreSQL
Why do followers in leader-based replication only read from a replication log?
To maintain the order of writes processed by the leader
How does leader-based replication handle client read requests?
Both leader and followers can be queried for read requests
Test your knowledge on replication, the process of keeping copies of the same data on multiple machines connected via a network. Explore reasons for replication and the challenges it poses, particularly in handling changes to replicated data. Learn about different algorithms used for replicating changes.
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