07d71fdcf8
When replicating transactions from parallel slave replication processing, Galera must respect the commit order of the parallel slave replication. In the current implementation this is done by calling `wait_for_prior_commit()` before the write set is replicated and certified in before-prepare processing. This however establishes a critical section which is held over whole Galera replication step, and the commit rate will be limited by Galera replication latency. In order to allow concurrency in Galera replication step, the critical section must be released at earliest point where Galera can guarantee sequential consistency for replicated write sets. This change passes a callback to release the critical section by calling `wakeup_subsequent_commits()` to Galera library, which will call the callback once the correct replication order can be established. This functionality will be available from Galera 26.4.22 onwards. Note that call to `wakeup_subsequent_commits()` at this stage is safe from group commit point of view as Galera uses separate `wait_for_commit` context to control commit ordering. Signed-off-by: Julius Goryavsky <julius.goryavsky@mariadb.com>
Code status:
ci.appveyor.com
MariaDB: The innovative open source database
MariaDB was designed as a drop-in replacement of MySQL(R) with more features, new storage engines, fewer bugs, and better performance.
MariaDB is brought to you by the MariaDB Foundation and the MariaDB Corporation. Please read the CREDITS file for details about the MariaDB Foundation, and who is developing MariaDB.
MariaDB is developed by many of the original developers of MySQL who now work for the MariaDB Corporation, the MariaDB Foundation and by many people in the community.
MySQL, which is the base of MariaDB, is a product and trademark of Oracle Corporation, Inc. For a list of developers and other contributors, see the Credits appendix. You can also run 'SHOW authors' to get a list of active contributors.
A description of the MariaDB project and a manual can be found at:
https://mariadb.com/kb/en/mariadb-vs-mysql-features/
https://mariadb.com/kb/en/mariadb-versus-mysql-compatibility/
https://mariadb.com/kb/en/new-and-old-releases/
Getting the code, building it and testing it
Refer to the following guide: https://mariadb.org/get-involved/getting-started-for-developers/get-code-build-test/ which outlines how to build the source code correctly and run the MariaDB testing framework, as well as which branch to target for your contributions.
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Bug and/or error reports regarding MariaDB should be submitted at: https://jira.mariadb.org
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