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Info Format

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Daniel Tischner edited this page May 20, 2018 · 2 revisions
Table of Contents

Overview

The backend uses .info files to optimize the initialization process.

They are automatically created if not present. Their location can be configured, see Configuration.

Usages include:

  • External database, if used
  • Graph cache, if used

Structure

An .info file represents a table, structured as .tsv file. Each row has two columns, separated by a TAB character:

  • Path - Path to a data file
  • Timestamp - Timestamp of when the data file was last modified, in milliseconds since epoch

An example might look like

res\input\osm\reduced_freiburg-regbez-latest.osm	1526318490998
res\input\osm\vitoria.osm	1526318491057

Usage

Entries represent the contents of the corresponding cache. If a cache was constructed using three data-sets, the file will contain three rows. One entry per data-set, together with a timestamp of when they were last modified at the time of construction.

If the backend uses the cached data it will, when reading data-sets, only consider files which are either not already contained in the cache or were modified since then.

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