Replication and Replication Algorithms Quiz
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Questions and Answers

What is the key difference between synchronous and asynchronous replication?

  • In synchronous replication, the leader can continue processing writes even if all its followers have fallen behind, while in asynchronous replication the leader must wait for confirmation.
  • In synchronous replication, the leader can replicate to multiple followers simultaneously, while in asynchronous replication the leader can only replicate to one follower at a time.
  • In synchronous replication, the leader can process writes without any followers, while in asynchronous replication the leader must have at least one active follower.
  • 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. (correct)

    • 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. (correct)
  • Synchronous replication is more complex to set up and manage than asynchronous replication.
  • Synchronous replication requires more network bandwidth and resources than asynchronous replication.
  • Synchronous replication does not provide any data loss guarantees, as writes can still be lost if the leader fails.

    • What is the advantage of asynchronous replication?

  • Asynchronous replication allows the leader to continue processing writes even if all its followers have fallen behind. (correct)
  • Asynchronous replication provides better data consistency guarantees than synchronous replication.
  • Asynchronous replication is more reliable than synchronous replication, as it is less affected by network delays or follower failures.
  • Asynchronous replication is more scalable than synchronous replication, as it can support more followers.

    • What is the purpose of the 'semi-synchronous' replication configuration described in the text?

    <p>To increase the availability of the system by automatically switching to an asynchronous follower if the synchronous one fails.</p> Signup and view all the answers

    What are the two options described in the text that are not sufficient for setting up a new follower?

    <p>Just copying data files from one node to another and locking the database.</p> Signup and view all the answers

    What is the recommended approach described in the text for setting up a new follower without downtime?

    <p>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.</p> Signup and view all the answers

    What is the main purpose of replication in a distributed system?

    <p>To maintain data consistency and availability</p> Signup and view all the answers

    Which algorithm does the text mention as an approach for replicating changes between nodes?

    <p>Leaderless replication</p> Signup and view all the answers

    What is the role of followers in leader-based replication?

    <p>Applying all the writes from the replication log in the order processed by the leader</p> Signup and view all the answers

    Which databases implement the leader-based replication approach according to the text?

    <p>MySQL and PostgreSQL</p> Signup and view all the answers

    Why do followers in leader-based replication only read from a replication log?

    <p>To maintain the order of writes processed by the leader</p> Signup and view all the answers

    How does leader-based replication handle client read requests?

    <p>Both leader and followers can be queried for read requests</p> Signup and view all the answers

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