Mroonga blog

2021-06-29

Mroonga 11.04 has been released!

Mroonga is a MySQL storage engine that supports fast fulltext search and geolocation search. It is CJK ready. It uses Groonga as a storage and fulltext search engine.

Mroonga 11.04 has been released!

Changes

The main changes are as follows.

Improvements

  • Server variables We disabled mroonga_enable_operations_recording by default.

    mroonga_enable_operations_recording to determine whether recording operations for auto recovering are enabled or not.

    This recording of operations is for auto recovering Mroonga when it crashed. Normally, if lock remain in Mroonga, we can't execute INSERT/DELETE/UPDATE, but if mroonga_enable_operations_recording is enable, we may not execute SELECT at times in addition to INSERT/DELETE/UPDATE. Because auto recovery is sometimes blocked by residual lock when they crashed.

    Therefore, we set OFF to the default value in this version. By we disable operation recording, INSERT/DELETE/UPDATE is blocked as usual because of the residual lock, but "SELECT" may bework.

    An appropriate way to handle to residual lock is as follows.

    • https://www.clear-code.com/blog/2021/6/1/mroonga-recover-lock-failed-2021.html (Japanese only)

  • Debian GNU/Linux Added a install procedure for Mroonga for Debian GNU/Linux with Oracle MySQL package.

    We supoort Mroonga for Debian GNU/Linux with Oracle MySQL package in Mroonga 11.03. We wrote install procedure for these package to this documentation. When we will install these packages, please refer to this documentation.

  • CentOS Added support for MariaDB 10.2.39, 10.3.30, 10.4.20, and 10.5.11.

Fixes

  • Fix a crash bag when we execute search

    This issue doesn't occur under normal use.

    The occurrence condition is as below.

    • We directly make tables and columns on Groonga by using mroonga_command.
    • We execute search at the same time as delete the above tables and columns.

    When the above conditions are established, Mroonga might crash.

Conclusion

See Release 11.04 - 2021-06-29 about detailed changes since 11.03.

Let's search by Mroonga!