DATABASE FUNDAMENTALS
BASICS OF BIG DATA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It is originally designed at Facebook
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It is designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure
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It is a centralized key-value store
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It uses a ring-based DHT (Distributed Hash Table) but without finger tables or routing
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Detailed explanation-1: -Cassandra is a popular distributed key value store, built initially at Facebook using commodity severs for allowing users to search through their inbox messages.
Detailed explanation-2: -Identify the incorrect big data Technologies. Answer-A) Apache PyTorch is incorrect.
Detailed explanation-3: -Cassandra uses a ring based Distributed Hash Table servers but without finger or routing tables. Keys are stored as in DHT to the next server with key > key id, replicated on the 2 next servers too. There is one ring per data center. The coordinator forward the query to a subset of replicas for a particular key.
Detailed explanation-4: -Discretized Streams (DStreams) Discretized Stream or DStream is the basic abstraction provided by Spark Streaming.