From: Dmitry Shulga Date: May 18 2011 10:44am Subject: bzr commit into mysql-5.1 branch (Dmitry.Shulga:3622) Bug#38813 Bug#11749345 List-Archive: http://lists.mysql.com/commits/137524 X-Bug: 38813,11749345 Message-Id: <201105181044.p4IAiJDZ004562@acsmt358.oracle.com> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="===============3082337235504408085==" --===============3082337235504408085== MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline #At file:///Users/shulga/projects/mysql/mysql-5.1-bug11749345/ based on revid:vinay.fisrekar@stripped 3622 Dmitry Shulga 2011-05-18 Fixed bug#11749345 (formerly bug#38813) - increasing memory consumption when selecting from I_S and views exist, in SP. Symptoms: re-execution of prepared statement (or statement in a stored routine) which read from one of I_S tables and which in order to fill this I_S table had to open a view led to increasing memory consumption. What happened in this situation was that during the process of view opening for purpose of I_S filling view-related structures (like its LEX) were allocated on persistent MEM_ROOT of prepared statement (or stored routine). Since this MEM_ROOT is not freed until prepared statement deallocation (or expulsion of stored routine from the cache) and code responsible for filling I_S is not able to re-use results of view opening from previous executions this allocation ended up in memory hogging. This patch solves the problem by ensuring that when a view opened for the purpose of I_S filling all its structures are allocated on non-persistent runtime MEM_ROOT. This is achieved by activating a temporary Query_arena bound to this MEM_ROOT. Since this step makes impossible linking of view structures into LEX of our prepared statement (or stored routine statement) this patch also changes code filling I_S table to install a proxy LEX before trying to open a view or a table. Consequently some code which was responsible for backing-up/restoring parts of LEX when view/table was opened during filling of I_S table became redundant and was removed. This patch doesn't contain test case for this bug as it is hard to test memory hogging in our test suite. modified: sql/sql_show.cc === modified file 'sql/sql_show.cc' --- a/sql/sql_show.cc 2011-04-04 13:04:15 +0000 +++ b/sql/sql_show.cc 2011-05-18 10:43:56 +0000 @@ -2428,12 +2428,11 @@ bool schema_table_store_record(THD *thd, } -int make_table_list(THD *thd, SELECT_LEX *sel, - LEX_STRING *db_name, LEX_STRING *table_name) +static int make_table_list(THD *thd, SELECT_LEX *sel, + LEX_STRING *db_name, LEX_STRING *table_name) { Table_ident *table_ident; table_ident= new Table_ident(thd, *db_name, *table_name, 1); - sel->init_query(); if (!sel->add_table_to_list(thd, table_ident, 0, 0, TL_READ)) return 1; return 0; @@ -3003,79 +3002,177 @@ make_table_name_list(THD *thd, Listlex; - bool res; - LEX_STRING tmp_lex_string, tmp_lex_string1, *db_name, *table_name; - enum_sql_command save_sql_command= lex->sql_command; - TABLE_LIST *show_table_list= tables->schema_select_lex->table_list.first; - TABLE *table= tables->table; - int error= 1; - DBUG_ENTER("fill_schema_show"); +static bool +fill_schema_table_by_open(THD *thd, bool is_show_fields_or_keys, + TABLE *table, ST_SCHEMA_TABLE *schema_table, + LEX_STRING *db_name, LEX_STRING *table_name, + Open_tables_state *open_tables_state_backup) +{ + Query_arena i_s_arena(thd->mem_root, + Query_arena::CONVENTIONAL_EXECUTION), + backup_arena, *old_arena; + LEX *old_lex= thd->lex, temp_lex, *lex; + LEX_STRING orig_db_name, orig_table_name; + TABLE_LIST *table_list; + bool result= true; - lex->all_selects_list= tables->schema_select_lex; /* - Restore thd->temporary_tables to be able to process - temporary tables(only for 'show index' & 'show columns'). - This should be changed when processing of temporary tables for - I_S tables will be done. + When a view is opened its structures are allocated on a permanent + statement arena and linked into the LEX tree for the current statement + (this happens even in cases when view is handled through TEMPTABLE + algorithm). + + To prevent this process from unnecessary hogging of memory in the permanent + arena of our I_S query and to avoid damaging its LEX we use temporary + arena and LEX for table/view opening. + + Use temporary arena instead of statement permanent arena. Also make + it active arena and save original one for successive restoring. */ - thd->temporary_tables= open_tables_state_backup->temporary_tables; + old_arena= thd->stmt_arena; + thd->stmt_arena= &i_s_arena; + thd->set_n_backup_active_arena(&i_s_arena, &backup_arena); + + /* Prepare temporary LEX. */ + thd->lex= lex= &temp_lex; + lex_start(thd); + + /* Disable constant subquery evaluation as we won't be locking tables. */ + lex->context_analysis_only= CONTEXT_ANALYSIS_ONLY_VIEW; + + /* + Some of process_table() functions rely on wildcard being passed from + old LEX (or at least being initialized). + */ + lex->wild= old_lex->wild; + + /* + Strings in db_name and table_name might be changed by make_table_list() + function. In order to pass their unaltered values to process_table() + call we save them here. + */ + if (!thd->make_lex_string(&orig_db_name, db_name->str, + db_name->length, FALSE) || + !thd->make_lex_string(&orig_table_name, table_name->str, + table_name->length, FALSE)) + goto end; + + /* + Create table list element for table to be open. Link it with the + temporary LEX. The latter is required to correctly open views and + produce table describing their structure. + */ + if (make_table_list(thd, &lex->select_lex, db_name, table_name)) + goto end; + + table_list= lex->select_lex.table_list.first; + + if (is_show_fields_or_keys) + { + /* + Restore thd->temporary_tables to be able to process + temporary tables (only for 'show index' & 'show columns'). + This should be changed when processing of temporary tables for + I_S tables will be done. + */ + thd->temporary_tables= open_tables_state_backup->temporary_tables; + } + else + { + /* + Apply optimization flags for table opening which are relevant for + this I_S table. We can't do this for SHOW COLUMNS/KEYS because of + backward compatibility. + */ + table_list->i_s_requested_object= schema_table->i_s_requested_object; + } + /* Let us set fake sql_command so views won't try to merge themselves into main statement. If we don't do this, SELECT * from information_schema.xxxx will cause problems. - SQLCOM_SHOW_FIELDS is used because it satisfies 'only_view_structure()' + SQLCOM_SHOW_FIELDS is used because it satisfies + 'only_view_structure()'. */ lex->sql_command= SQLCOM_SHOW_FIELDS; - res= open_normal_and_derived_tables(thd, show_table_list, - MYSQL_LOCK_IGNORE_FLUSH); - lex->sql_command= save_sql_command; + + result= open_normal_and_derived_tables(thd, table_list, + MYSQL_LOCK_IGNORE_FLUSH); + /* - get_all_tables() returns 1 on failure and 0 on success thus - return only these and not the result code of ::process_table() + Restore old value of sql_command back as it is being looked at in + process_table() function. + */ + lex->sql_command= old_lex->sql_command; + + /* + XXX: show_table_list has a flag i_is_requested, + and when it's set, open_normal_and_derived_tables() + can return an error without setting an error message + in THD, which is a hack. This is why we have to + check for res, then for thd->is_error() and only then + for thd->main_da.sql_errno(). - We should use show_table_list->alias instead of - show_table_list->table_name because table_name - could be changed during opening of I_S tables. It's safe - to use alias because alias contains original table name - in this case(this part of code is used only for - 'show columns' & 'show statistics' commands). + Again we don't do this for SHOW COLUMNS/KEYS because + of backward compatibility. + */ + if (!is_show_fields_or_keys && result && thd->is_error() && + thd->main_da.sql_errno() == ER_NO_SUCH_TABLE) + { + /* + Hide error for a non-existing table. + For example, this error can occur when we use a where condition + with a db name and table, but the table does not exist. + */ + result= 0; + thd->clear_error(); + } + else + { + result= schema_table->process_table(thd, table_list, + table, result, + &orig_db_name, + &orig_table_name); + } + +end: + lex->unit.cleanup(); + + /* Restore original LEX value, statement's arena and THD arena values. */ + lex_end(thd->lex); + thd->lex= old_lex; + + if (i_s_arena.free_list) + i_s_arena.free_items(); + + /* + For safety reset list of open temporary tables before closing + all tables open within this Open_tables_state. */ - table_name= thd->make_lex_string(&tmp_lex_string1, show_table_list->alias, - strlen(show_table_list->alias), FALSE); - if (!show_table_list->view) - db_name= thd->make_lex_string(&tmp_lex_string, show_table_list->db, - show_table_list->db_length, FALSE); - else - db_name= &show_table_list->view_db; - - - error= test(schema_table->process_table(thd, show_table_list, - table, res, db_name, - table_name)); - thd->temporary_tables= 0; - close_tables_for_reopen(thd, &show_table_list); - DBUG_RETURN(error); + thd->temporary_tables= NULL; + close_thread_tables(thd); + + thd->stmt_arena= old_arena; + thd->restore_active_arena(&i_s_arena, &backup_arena); + + return result; } @@ -3300,11 +3397,8 @@ int get_all_tables(THD *thd, TABLE_LIST { LEX *lex= thd->lex; TABLE *table= tables->table; - SELECT_LEX *old_all_select_lex= lex->all_selects_list; - enum_sql_command save_sql_command= lex->sql_command; SELECT_LEX *lsel= tables->schema_select_lex; ST_SCHEMA_TABLE *schema_table= tables->schema_table; - SELECT_LEX sel; LOOKUP_FIELD_VALUES lookup_field_vals; LEX_STRING *db_name, *table_name; bool with_i_schema; @@ -3312,20 +3406,14 @@ int get_all_tables(THD *thd, TABLE_LIST List db_names; List_iterator_fast it(db_names); COND *partial_cond= 0; - uint derived_tables= lex->derived_tables; int error= 1; Open_tables_state open_tables_state_backup; - uint8 save_context_analysis_only= lex->context_analysis_only; - Query_tables_list query_tables_list_backup; #ifndef NO_EMBEDDED_ACCESS_CHECKS Security_context *sctx= thd->security_ctx; #endif uint table_open_method; DBUG_ENTER("get_all_tables"); - lex->context_analysis_only|= CONTEXT_ANALYSIS_ONLY_VIEW; - lex->reset_n_backup_query_tables_list(&query_tables_list_backup); - /* We should not introduce deadlocks even if we already have some tables open and locked, since we won't lock tables which we will @@ -3340,8 +3428,18 @@ int get_all_tables(THD *thd, TABLE_LIST */ if (lsel && lsel->table_list.first) { - error= fill_schema_show_cols_or_idxs(thd, tables, schema_table, - &open_tables_state_backup); + LEX_STRING db_name, table_name; + + db_name.str= lsel->table_list.first->db; + db_name.length= lsel->table_list.first->db_length; + + table_name.str= lsel->table_list.first->table_name; + table_name.length= lsel->table_list.first->table_name_length; + + error= fill_schema_table_by_open(thd, TRUE, + table, schema_table, + &db_name, &table_name, + &open_tables_state_backup); goto err; } @@ -3399,12 +3497,6 @@ int get_all_tables(THD *thd, TABLE_LIST it.rewind(); /* To get access to new elements in basis list */ while ((db_name= it++)) { - LEX_STRING orig_db_name; - - /* db_name can be changed in make_table_list() func */ - if (!thd->make_lex_string(&orig_db_name, db_name->str, - db_name->length, FALSE)) - goto err; #ifndef NO_EMBEDDED_ACCESS_CHECKS if (!(check_access(thd,SELECT_ACL, db_name->str, &thd->col_access, 0, 1, with_i_schema) || @@ -3466,64 +3558,14 @@ int get_all_tables(THD *thd, TABLE_LIST continue; } - int res; - LEX_STRING tmp_lex_string; - /* - Set the parent lex of 'sel' because it is needed by - sel.init_query() which is called inside make_table_list. - */ thd->no_warnings_for_error= 1; - sel.parent_lex= lex; - if (make_table_list(thd, &sel, db_name, table_name)) - goto err; - TABLE_LIST *show_table_list= sel.table_list.first; - lex->all_selects_list= &sel; - lex->derived_tables= 0; - lex->sql_command= SQLCOM_SHOW_FIELDS; - show_table_list->i_s_requested_object= - schema_table->i_s_requested_object; + DEBUG_SYNC(thd, "before_open_in_get_all_tables"); - res= open_normal_and_derived_tables(thd, show_table_list, - MYSQL_LOCK_IGNORE_FLUSH); - lex->sql_command= save_sql_command; - /* - XXX: show_table_list has a flag i_is_requested, - and when it's set, open_normal_and_derived_tables() - can return an error without setting an error message - in THD, which is a hack. This is why we have to - check for res, then for thd->is_error() only then - for thd->main_da.sql_errno(). - */ - if (res && thd->is_error() && - thd->main_da.sql_errno() == ER_NO_SUCH_TABLE) - { - /* - Hide error for not existing table. - This error can occur for example when we use - where condition with db name and table name and this - table does not exist. - */ - res= 0; - thd->clear_error(); - } - else - { - /* - We should use show_table_list->alias instead of - show_table_list->table_name because table_name - could be changed during opening of I_S tables. It's safe - to use alias because alias contains original table name - in this case. - */ - thd->make_lex_string(&tmp_lex_string, show_table_list->alias, - strlen(show_table_list->alias), FALSE); - res= schema_table->process_table(thd, show_table_list, table, - res, &orig_db_name, - &tmp_lex_string); - close_tables_for_reopen(thd, &show_table_list); - } - DBUG_ASSERT(!lex->query_tables_own_last); - if (res) + + if (fill_schema_table_by_open(thd, FALSE, + table, schema_table, + db_name, table_name, + &open_tables_state_backup)) goto err; } } @@ -3539,11 +3581,7 @@ int get_all_tables(THD *thd, TABLE_LIST error= 0; err: thd->restore_backup_open_tables_state(&open_tables_state_backup); - lex->restore_backup_query_tables_list(&query_tables_list_backup); - lex->derived_tables= derived_tables; - lex->all_selects_list= old_all_select_lex; - lex->context_analysis_only= save_context_analysis_only; - lex->sql_command= save_sql_command; + DBUG_RETURN(error); } --===============3082337235504408085== 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