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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 16:22:29 -05:00
parent 5b6f637caa
commit 9b7e3801f4
8 changed files with 154 additions and 3 deletions
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8
sql/sql_parse.cc
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@ -2392,11 +2392,13 @@ mysql_execute_command(THD *thd)
}
/*
* bail out if DB snapshot has not been installed. We however,
* allow SET and SHOW queries
*/
Bail out if DB snapshot has not been installed. We however,
allow SET and SHOW queries.
*/
if (thd->variables.wsrep_on && !thd->wsrep_applier && !wsrep_ready &&
lex->sql_command != SQLCOM_SET_OPTION &&
!(thd->variables.wsrep_dirty_reads &&
lex->sql_command == SQLCOM_SELECT) &&
!wsrep_is_show_query(lex->sql_command))
{
#if DIRTY_HACK