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backport dmitry.shulga@oracle.com-20120209125742-w7hdxv0103ymb8ko from mysql-trunk: Patch for bug#11764747 (formerly known as 57612): SET GLOBAL READ_ONLY=1 cannot progress when a table is locked with LOCK TABLES. The reason for the bug was that mysql server makes a flush of all open tables during handling of statement 'SET GLOBAL READ_ONLY=1'. Therefore if some of these tables were locked by "LOCK TABLE ... READ" from a different connection, then execution of statement 'SET GLOBAL READ_ONLY=1' would be waiting for the lock for such table even if the table was locked in a compatible read mode. Flushing of all open tables before setting of read_only system variable is inherited from 5.1 implementation since this was the only possible approach to ensure that there isn't any pending write operations on open tables. Start from version 5.5 and above such behaviour is guaranteed by the fact that we acquire global_read_lock before setting read_only flag. Since acquiring of global_read_lock is successful only when there isn't any active write operation then we can remove flushing of open tables from processing of SET GLOBAL READ_ONLY=1. This modification changes the server behavior so that read locks held by other connections (LOCK TABLE ... READ) no longer will block attempts to enable read_only.
159 lines
5.1 KiB
Text
159 lines
5.1 KiB
Text
set @start_read_only= @@global.read_only;
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DROP TABLE IF EXISTS t1,t2,t3;
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grant CREATE, SELECT, DROP on *.* to test@localhost;
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connect (con1,localhost,test,,test);
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connection default;
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set global read_only=0;
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connection con1;
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create table t1 (a int);
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insert into t1 values(1);
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create table t2 select * from t1;
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connection default;
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set global read_only=1;
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create table t3 (a int);
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drop table t3;
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connection con1;
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select @@global.read_only;
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@@global.read_only
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1
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create table t3 (a int);
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ERROR HY000: The MariaDB server is running with the --read-only option so it cannot execute this statement
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insert into t1 values(1);
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ERROR HY000: The MariaDB server is running with the --read-only option so it cannot execute this statement
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update t1 set a=1 where 1=0;
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ERROR HY000: The MariaDB server is running with the --read-only option so it cannot execute this statement
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update t1,t2 set t1.a=t2.a+1 where t1.a=t2.a;
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ERROR HY000: The MariaDB server is running with the --read-only option so it cannot execute this statement
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delete t1,t2 from t1,t2 where t1.a=t2.a;
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ERROR HY000: The MariaDB server is running with the --read-only option so it cannot execute this statement
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create temporary table t3 (a int);
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create temporary table t4 (a int) select * from t3;
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insert into t3 values(1);
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insert into t4 select * from t3;
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update t1,t3 set t1.a=t3.a+1 where t1.a=t3.a;
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ERROR HY000: The MariaDB server is running with the --read-only option so it cannot execute this statement
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update t1,t3 set t3.a=t1.a+1 where t1.a=t3.a;
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update t4,t3 set t4.a=t3.a+1 where t4.a=t3.a;
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delete t1 from t1,t3 where t1.a=t3.a;
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ERROR HY000: The MariaDB server is running with the --read-only option so it cannot execute this statement
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delete t3 from t1,t3 where t1.a=t3.a;
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delete t4 from t3,t4 where t4.a=t3.a;
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create temporary table t1 (a int);
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insert into t1 values(1);
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update t1,t3 set t1.a=t3.a+1 where t1.a=t3.a;
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delete t1 from t1,t3 where t1.a=t3.a;
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drop table t1;
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insert into t1 values(1);
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ERROR HY000: The MariaDB server is running with the --read-only option so it cannot execute this statement
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connection default;
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set global read_only=0;
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lock table t1 write;
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connection con1;
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lock table t2 write;
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connection default;
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set global read_only=1;
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ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
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unlock tables ;
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send set global read_only=1;
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set global read_only=1;
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connection con1;
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select @@global.read_only;
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@@global.read_only
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0
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unlock tables ;
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select @@global.read_only;
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@@global.read_only
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1
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connection default;
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reap;
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connection default;
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set global read_only=0;
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lock table t1 read;
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connection con1;
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lock table t2 read;
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connection default;
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set global read_only=1;
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ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
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unlock tables ;
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set global read_only=1;
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select @@global.read_only;
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@@global.read_only
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1
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connection con1;
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select @@global.read_only;
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@@global.read_only
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1
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unlock tables ;
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connection default;
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connection default;
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set global read_only=0;
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BEGIN;
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connection con1;
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BEGIN;
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connection default;
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set global read_only=1;
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ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
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ROLLBACK;
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set global read_only=1;
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connection con1;
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select @@global.read_only;
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@@global.read_only
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1
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ROLLBACK;
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connection default;
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set global read_only=0;
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flush tables with read lock;
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set global read_only=1;
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unlock tables;
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connect (root2,localhost,root,,test);
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connection default;
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set global read_only=0;
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flush tables with read lock;
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connection root2;
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set global read_only=1;
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connection default;
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select @@global.read_only;
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@@global.read_only
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1
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unlock tables;
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drop temporary table ttt;
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ERROR 42S02: Unknown table 'ttt'
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drop temporary table if exists ttt;
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Warnings:
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Note 1051 Unknown table 'ttt'
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connection default;
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set global read_only=0;
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drop table t1,t2;
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drop user test@localhost;
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#
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# Bug#27440 read_only allows create and drop database
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#
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set global read_only= 1;
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drop database if exists mysqltest_db1;
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drop database if exists mysqltest_db2;
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delete from mysql.user where User like 'mysqltest_%';
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delete from mysql.db where User like 'mysqltest_%';
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delete from mysql.tables_priv where User like 'mysqltest_%';
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delete from mysql.columns_priv where User like 'mysqltest_%';
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flush privileges;
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grant all on mysqltest_db2.* to `mysqltest_u1`@`%`;
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create database mysqltest_db1;
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grant all on mysqltest_db1.* to `mysqltest_u1`@`%`;
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flush privileges;
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connect (con_bug27440,127.0.0.1,mysqltest_u1,,test,MASTER_MYPORT,);
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connection con_bug27440;
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create database mysqltest_db2;
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ERROR HY000: The MariaDB server is running with the --read-only option so it cannot execute this statement
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show databases like '%mysqltest_db2%';
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Database (%mysqltest_db2%)
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drop database mysqltest_db1;
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ERROR HY000: The MariaDB server is running with the --read-only option so it cannot execute this statement
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disconnect con_bug27440;
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connection default;
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delete from mysql.user where User like 'mysqltest_%';
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delete from mysql.db where User like 'mysqltest_%';
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delete from mysql.tables_priv where User like 'mysqltest_%';
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delete from mysql.columns_priv where User like 'mysqltest_%';
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flush privileges;
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drop database mysqltest_db1;
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set global read_only= @start_read_only;
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