Lessons

The emergence of the term NoSQL. Basic characteristics of NoSQL databases. Representation of data in the form of aggregates (aggregates).

Weak ACID properties. Distributed systems, without shared resources (share nothing). NoSQL databases are mostly open source and created in the 21st century.

Description. data model. Data types.

Data distribution. Consistency of data when writing. Consistency of data when reading.

What is sharding? We share the indivisible. A simple example of "how to do it by hand". Amdahl law.

How to shard and slow down N times? About the semi-auto. Absolute perfect automation? What are F()? The price to be paid. Complex/long pain: resharding.

The history of the emergence of the term BigData. Principles of working with big data. MapReduce. Examples of tasks effectively solved using MapReduce.

General information about Hadoop. Running MapReduce programs on Hadoop. Method number 1. Hadoop Streaming. Method number 2: use Java.

Map only job. combine. Chains of MapReduce tasks. distributed cache. Reduce Join. mapjoin.

Who invented HBase and why. data model. Supported operations. Architecture. Ways to work with HBase. Some features of working with HBase. Alternatives.