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MDEV-7476: Allow SELECT to succeed even when node is not ready

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Added a SESSION-only system variable "wsrep_dirty_reads" to allow SELECT
queries to pass even when the node is not prepared to accept queries
(wsrep_ready=OFF). Added a test case.
This commit is contained in:
Nirbhay Choubey
2015-01-27 16:54:24 -05:00
parent 950d69610a
commit 47d8001c67
8 changed files with 154 additions and 3 deletions
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35
mysql-test/suite/sys_vars/t/wsrep_dirty_reads_basic.test Normal file
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--source include/have_wsrep.inc
--echo #
--echo # wsrep_dirty_reads
--echo #
--echo # save the initial value
SET @wsrep_dirty_reads_session_saved = @@session.wsrep_dirty_reads;
--echo # default
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
SELECT @@global.wsrep_dirty_reads;
SELECT @@session.wsrep_dirty_reads;
--echo
--echo # scope and valid values
SET @@session.wsrep_dirty_reads=OFF;
SELECT @@session.wsrep_dirty_reads;
SET @@session.wsrep_dirty_reads=ON;
SELECT @@session.wsrep_dirty_reads;
SET @@session.wsrep_dirty_reads=default;
SELECT @@session.wsrep_dirty_reads;
--echo
--echo # invalid values
--error ER_WRONG_VALUE_FOR_VAR
SET @@session.wsrep_dirty_reads=NULL;
--error ER_WRONG_VALUE_FOR_VAR
SET @@session.wsrep_dirty_reads='junk';
--echo
--echo # restore the initial values
SET @@session.wsrep_dirty_reads = @wsrep_dirty_reads_session_saved;
--echo # End of test