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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
2016-10-26 14:52:24 +05:30
parent ea0ae42d83
commit 7ed5563bbe
3 changed files with 24 additions and 1 deletions
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5
sql/sql_parse.cc
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@@ -2650,12 +2650,15 @@ mysql_execute_command(THD *thd)
/*
Bail out if DB snapshot has not been installed. We however, allow SET,
SHOW and SELECT queries (only if wsrep_dirty_reads is set).
SHOW and SELECT queries (only if wsrep_dirty_reads is set or when it
does not access any table).
*/
if (lex->sql_command != SQLCOM_SET_OPTION &&
!wsrep_is_show_query(lex->sql_command) &&
!(thd->variables.wsrep_dirty_reads &&
lex->sql_command == SQLCOM_SELECT) &&
!(lex->sql_command == SQLCOM_SELECT &&
!all_tables) &&
!wsrep_node_is_ready(thd))
goto error;
}