Big Data Systems HPI

Quiz 3 - MapReduce II & Key-Value Stores


Question

According to the CAP Theorem, distributed systems can only guarantee two out of the following three properties:

  • Consistency - All nodes have the same view of the data at all times.
  • Availability - All requests sent to the system are answered.
  • Partition Tolerance - The system maintains its properties even in case of a network partition.

This implies that we can build three different types of database systems CA, CP & AP. Based on this classification, which type of system would you aim for the following scenarios?

  1. You are an online retailer which uses shopping carts to collect items that users want to buy.
  2. You are a bank that wants to develop the software for its ATMs.
  3. You are the owner of a social media application providing a social media feed.

Answer
  1. AP
  2. CP
  3. AP



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