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Module Version: 1.16   Source   Latest Release: CPAN-Testers-Data-Generator-1.21


CPAN::Testers::Data::Generator - Download and summarize CPAN Testers data


  % cpanstats
  # ... wait patiently, very patiently
  # ... then use the cpanstats MySQL database


This distribution was originally written by Leon Brocard to download and summarize CPAN Testers data. However, all of the original code has been rewritten to use the CPAN Testers Statistics database generation code. This now means that all the CPAN Testers sites including the Reports site, the Statistics site and the CPAN Dependencies site, can use the same database.

This module retrieves and parses reports from the Metabase, generating or updating entries in the cpanstats database, which extracts specific metadata from the reports. The information in the cpanstats database is then presented via CPAN::Testers::WWW::Reports on the CPAN Testers Reports website.

A good example query from the cpanstats database for Acme-Colour would be:

  SELECT version, status, count(*) FROM cpanstats WHERE
  dist = "Acme-Colour" group by version, state;

To create a database from scratch can take several days, as there are now over 24 million submitted reports. As such updating from a known copy of the database is much more advisable. If you don't want to generate the database yourself, you can obtain a feed using CPAN::Testers::WWW::Report::Query::Reports.

With over 24 million reports in the database, if you do plan to run this software to generate the databases it is recommended you utilise a high-end processor machine. Even with a reasonable processor it can take over a week!


The cpanstats database schema is very straightforward, one main table with several index tables to speed up searches. The main table is as below:

  CREATE TABLE `cpanstats` (

    `id`          int(10) unsigned    NOT NULL AUTO_INCREMENT,
    `guid`        char(36)            NOT NULL DEFAULT '',
    `state`       varchar(32)         DEFAULT NULL,
    `postdate`    varchar(8)          DEFAULT NULL,
    `tester`      varchar(255)        DEFAULT NULL,
    `dist`        varchar(255)        DEFAULT NULL,
    `version`     varchar(255)        DEFAULT NULL,
    `platform`    varchar(255)        DEFAULT NULL,
    `perl`        varchar(255)        DEFAULT NULL,
    `osname`      varchar(255)        DEFAULT NULL,
    `osvers`      varchar(255)        DEFAULT NULL,
    `fulldate`    varchar(32)         DEFAULT NULL,
    `type`        int(2)              DEFAULT '0',
    PRIMARY KEY       (`id`),
    KEY `guid`        (`guid`),
    KEY `distvers`    (`dist`,`version`),
    KEY `tester`      (`tester`),
    KEY `state`       (`state`),
    KEY `postdate`    (`postdate`)

It should be noted that 'postdate' refers to the YYYYMM formatted date, whereas the 'fulldate' field refers to the YYYYMMDDhhmm formatted date and time.

The metabase database schema is again very straightforward, and consists of one main table, as below:

  CREATE TABLE `metabase` (
    `guid`      char(36)            NOT NULL,
    `id`        int(10) unsigned    NOT NULL,
    `updated`   varchar(32)         DEFAULT NULL,
    `report`    longblob            NOT NULL,
    `fact`      longblob            NOT NULL,
    PRIMARY KEY     (`guid`),
    KEY `id`        (`id`),
    KEY `updated`   (`updated`)

The id field is a reference to the field.

The report field is JSON encoded, and is a cached version of the facts of a report, while the fact field is the full report fact, and associated child facts, Sereal encoded. Both are extracted from the returned fact from Metabase::Librarian.

See examples/cpanstats-createdb for the full list of tables used.



With the release of v0.31, a number of changes to the codebase were made as a further move towards CPAN Testers 2.0. The first change is the name for this distribution. Now titled 'CPAN-Testers-Data-Generator', this now fits more appropriately within the CPAN-Testers namespace on CPAN.

The second significant change is to now reference a MySQL cpanstats database. The SQLite version is still updated as before, as a number of other websites and toolsets still rely on that database file format. However, in order to make the CPAN Testers Reports website more dynamic, an SQLite database is not really appropriate for a high demand website.

The database creation code is now available as a standalone program, in the examples directory, and all the database communication is now handled by the new distribution CPAN-Testers-Common-DBUtils.


In the next stage of development of CPAN Testers 2.0, the id field used within the database schema above for the cpanstats table no longer matches the NNTP ID value, although the id in the articles does still reference the NNTP ID, at least for the reports submitted prior to the switch to the Metabase in 2010.

In order to correctly reference the id in the articles table, you will need to use the function guid_to_nntp() with CPAN::Testers::Common::Utils, using the new guid field in the cpanstats table.

As of this release the cpanstats id field is a unique auto incrementing field.

The next release of this distribution will be focused on generation of stats using the Metabase storage API.


Moved to Metabase API. The change to a definite major version number hopefully indicates that this is a major interface change. All previous NNTP access has been dropped and is no longer relavent. All report updates are now fed from the Metabase API.


The Constructor

Public Methods

Private Methods

Very Private methods

The following modules load information enmasse to avoid DB connection hogging and IO blocking. Thus improving performance.


The CPAN Testers was conceived back in May 1998 by Graham Barr and Chris Nandor as a way to provide multi-platform testing for modules. Today there are over 40 million tester reports and more than 100 testers each month giving valuable feedback for users and authors alike.


Whether you have a common platform or a very unusual one, you can help by testing modules you install and submitting reports. There are plenty of module authors who could use test reports and helpful feedback on their modules and distributions.

If you'd like to get involved, please take a look at the CPAN Testers Wiki, where you can learn how to install and configure one of the recommended smoke tools.

For further help and advice, please subscribe to the the CPAN Testers discussion mailing list.

  CPAN Testers Wiki
  CPAN Testers Discuss mailing list


There are no known bugs at the time of this release. However, if you spot a bug or are experiencing difficulties, that is not explained within the POD documentation, please send bug reports and patches to the RT Queue (see below).

Fixes are dependent upon their severity and my availability. Should a fix not be forthcoming, please feel free to (politely) remind me.

RT Queue -


CPAN::Testers::Report, Metabase, Metabase::Fact, CPAN::Testers::Fact::LegacyReport, CPAN::Testers::Fact::TestSummary, CPAN::Testers::Metabase::AWS



It should be noted that the original code for this distribution began life under another name. The original distribution generated data for the original CPAN Testers website. However, in 2008 the code was reworked to generate data in the format for the statistics data analysis, which in turn was reworked to drive the redesign of the all the CPAN Testers websites. To reflect the code changes, a new name was given to the distribution.


  Original author:    Leon Brocard <>   (C) 2002-2008
  Current maintainer: Barbie       <>   (C) 2008-2010


  Original author:    Barbie       <>   (C) 2008-2014


  This module is free software; you can redistribute it and/or
  modify it under the Artistic License 2.0.
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