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MDEV-21921 Make transaction_isolation and transaction_read_only into system variables

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In MariaDB, we have a confusing problem where:
* The transaction_isolation option can be set in a configuration file, but it cannot be set dynamically.
* The tx_isolation system variable can be set dynamically, but it cannot be set in a configuration file.

Therefore, we have two different names for the same thing in different contexts. This is needlessly confusing, and it complicates the documentation. The same thing applys for transaction_read_only.

MySQL 5.7 solved this problem by making them into system variables. https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-20.html

This commit takes a similar approach by adding new system variables and marking the original ones as deprecated. This commit also resolves some legacy problems related to SET STATEMENT and transaction_isolation.
This commit is contained in:
Junqi Xie
2023-03-12 13:55:30 +08:00
committed by Daniel Black
parent 4472a7b4ff
commit d20a96f9c1
100 changed files with 1232 additions and 962 deletions
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4
mysql-test/suite/rpl/t/rpl_parallel_optimistic.test
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@@ -272,7 +272,7 @@ eval SELECT IF($retry1=$retry2, "Ok, no retry",
SET @old_format= @@GLOBAL.binlog_format;
# Use MIXED format; we cannot binlog ROW events on slave in STATEMENT format.
SET GLOBAL binlog_format= MIXED;
SET @old_isolation= @@GLOBAL.tx_isolation;
SET @old_isolation= @@GLOBAL.transaction_isolation;
SET GLOBAL TRANSACTION ISOLATION LEVEL READ COMMITTED;
# Reset the worker threads to make the new settings take effect.
SET GLOBAL slave_parallel_threads=0;
@@ -317,7 +317,7 @@ SELECT * FROM t2 ORDER BY a;
--source include/stop_slave.inc
SET GLOBAL binlog_format= @old_format;
SET GLOBAL tx_isolation= @old_isolation;
SET GLOBAL transaction_isolation= @old_isolation;
--source include/start_slave.inc