Sawzall (programming language)

Sawzall is a procedural, domain-specific programming language used by Google to process large numbers of individual log records. It was first described in 2003, and the szl runtime was open-sourced in August 2010. The open-sourced runtime is of limited use for large-scale analysis of many log files on its own, because the MapReduce table aggregators that the language relies on were not released. The sample program published with the language declares tables, such as one that sums integers and others that sum floating-point numbers, reads a floating-point value from its input, and emits values into those tables, for example emit count <- 1, leaving the combining of results to the table aggregators. The Programming Language Database lists Go, Protocol Buffers and the Google File System as related entries and records Google as the place of early development.