BSEtec Blog Bytes

Caching Explained

Caching Scheme The concept of caching is simple. If the data needed to satisfy the access request are not already cached, then a copy of those data is brought from the server to the client system. Accesses are performed on the cached copy. The

Apache Spark SQL

Catalyst (sql/catalyst) – An implementation-agnostic framework for manipulating trees of relational operators and expressions. Execution (sql/core) – A query planner / execution engine for translating Catalyst’s logical query plans into Spark RDDs. This component also includes a new public interface, SQLContext, that allows users

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