Another Word For It Patrick Durusau on Topic Maps and Semantic Diversity

February 19, 2011

Cascalog: Clojure-based Query Language for Hadoop – Post

Filed under: Cascalog,Hadoop — Patrick Durusau @ 4:34 pm

Cascalog: Clojure-based Query Language for Hadoop

From the post:

Cascalog, introduced in the linked article, is a query language for Hadoop featuring:

  • Simple – Functions, filters, and aggregators all use the same syntax. Joins are implicit and natural.
  • Expressive – Logical composition is very powerful, and you can run arbitrary Clojure code in your query with little effort.
  • Interactive – Run queries from the Clojure REPL.
  • Scalable – Cascalog queries run as a series of MapReduce jobs.
  • Query anything – Query HDFS data, database data, and/or local data by making use of Cascading’s “Tap” abstraction
  • Careful handling of null values – Null values can make life difficult. Cascalog has a feature called “non-nullable variables” that makes dealing with nulls painless.
  • First class interoperability with Cascading – Operations defined for Cascalog can be used in a Cascading flow and vice-versa
  • First class interoperability with Clojure – Can use regular Clojure functions as operations or filters, and since Cascalog is a Clojure DSL, you can use it in other Clojure code.

From Alex Popescu’s myNoSQL

There are a number of NoSQL query languages.

Which should be considered alongside TMQL4J in TMQL discussions.

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