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MDEV-11016 wsrep_node_is_ready() check is too strict

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Problem:-
      The condition that checks for node readiness is too strict as it does
      not allow SELECTs even if these selects do not access any tables.
      For example,if we run
           SELECT 1;
      OR
           SELECT @@max_allowed_packet;
      Solution:-
      We need not to report this error when all_tables(lex->query_tables)
      is NULL:
This commit is contained in:
SachinSetiya 2016-12-01 12:16:13 +05:30
parent 1bba40f0df
commit 72fd15f7c3
3 changed files with 24 additions and 0 deletions
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13
mysql-test/suite/galera/r/galera_var_dirty_reads.result
View file

@ -18,6 +18,19 @@ SET @@session.wsrep_dirty_reads=ON;
SELECT * FROM t1;
i
1
SET @@session.wsrep_dirty_reads=OFF;
SELECT 2;
2
2
SELECT @@max_allowed_packet;
@@max_allowed_packet
4194304
SELECT 2+2 from DUAL;
2+2
4
SELECT sysdate() from DUAL;
sysdate()
2016-10-28 23:13:06
SELECT * FROM t1;
i
1

7
mysql-test/suite/galera/t/galera_var_dirty_reads.test
View file

@ -39,6 +39,13 @@ SET @@session.wsrep_dirty_reads=ON;
SELECT * FROM t1;
#Select query which does not access table should be allowed MDEV-11016
SET @@session.wsrep_dirty_reads=OFF;
SELECT 2;
SELECT @@max_allowed_packet;
SELECT 2+2 from DUAL;
SELECT sysdate() from DUAL;
--disable_query_log
--eval SET @@global.wsrep_cluster_address = '$wsrep_cluster_address_saved'
--enable_query_log

4
sql/sql_parse.cc
View file

@ -2388,11 +2388,15 @@ mysql_execute_command(THD *thd)
/*
Bail out if DB snapshot has not been installed. We however,
allow SET and SHOW queries.
SHOW and SELECT queries (only if wsrep_dirty_reads is set or when it
does not access any table).
*/
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) &&
!(lex->sql_command == SQLCOM_SELECT &&
!all_tables) &&
!wsrep_is_show_query(lex->sql_command))
{
#if DIRTY_HACK