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July 01, 2008

Q4M 0.7 released

Version 0.7 of Q4M (a pluggable message queue storage engine for MySQL) has been released with following changes.

  1. Faster SELECT COUNT(*)

    Q4M now caches the number of rows within a table. It is now possible to heavily issue SELECT COUNT(*) queries to monitor queue usage.

  2. Dropped binlog capability flags

    Q4M tables were incorrectly marked as binlog-capable in previous releases.

  3. Added examples/crawler

    Q4M now includes an example web spider implementation. According to a test using preliminary version (detail in Japanese), the implementation was about two times faster than a crawler based on POE. It is also easier to monitor, since ordinary SQL can be used to examine and/or adjust the request queues.