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[Maria-developers] Updated (by Alexi): Add a mysqlbinlog option to filter updates to certain tables (40)
by worklog-noreply＠askmonty.org 03 Nov '09

03 Nov '09

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Add a mysqlbinlog option to filter updates to certain tables CREATION DATE..: Mon, 10 Aug 2009, 13:25 SUPERVISOR.....: Monty IMPLEMENTOR....: COPIES TO......: Psergey CATEGORY.......: Server-RawIdeaBin TASK ID........: 40 (http://askmonty.org/worklog/?tid=40) VERSION........: Server-9.x STATUS.........: Un-Assigned PRIORITY.......: 60 WORKED HOURS...: 2 ESTIMATE.......: 48 (hours remain) ORIG. ESTIMATE.: 48 PROGRESS NOTES: -=-=(Alexi - Tue, 03 Nov 2009, 11:19)=-=- Low Level Design modified. --- /tmp/wklog.40.old.7187 2009-11-03 11:19:22.000000000 +0200 +++ /tmp/wklog.40.new.7187 2009-11-03 11:19:22.000000000 +0200 @@ -1 +1,132 @@ +OPTION: 2.5 Extend Query Events With Tables Info +================================================ +1. Query_log_event Binary Format +******************************** +Changes to be done: + + Query_log_event binary format + --------------------------------- + Name Size (bytes) + --------------------------------- + COMMON HEADER: + timestamp 4 + type 1 + server_id 4 + total_size 4 + master_position 4 + flags 2 + --------------------------------- + POST HEADER: + slave_proxy_id 4 + exec_time 4 + db_len 1 ++ query_len 2 (see Note 1) + error_code 2 + status_vars_len 2 ++ tables_info_len 2 (see Note 2) + --------------------------------- + BODY: + status_vars status_vars_len +- db db_len + 1 ++ db db_len (see Note 3) + query query_len ++ tables_info + + tables_info binary format + --------------------------------- + Name Size (bytes) + --------------------------------- + db_len 1 (see Note 4) + db db_len + table_name_len 1 + table_name table_name_len + ... + db_len 1 + db db_len + table_name_len 1 + table_name table_name_len + +NOTES +1. Currently Query_log_event format doesn't include 'query_len' because + it considers the query to extent to the end of the event. +2. If tables_info is not included in the event (--binlog-with-tables-info + option), tables_info_len = 0. +3. The trailing zero is redundant since the length is already known. +4. In case of db = current db, db_len = 0 and db = empty, because + current db is already included in the current event format. + +2. Where to get tables info from? +********************************* + +2.1. Case study: CREATE TABLE +****************************** + +*** CREATE TABLE table [SELECT ...] + + bool mysql_create_table_no_lock( + THD *thd, + const char *db, + const char *table_name, ...) + { + ... + // ------------------------------------- + // WL40: To be included in tables_info: + // * db, table_name + // * thd->lex->query_tables (tables refered to in + // the select-part; empty if no select-part) + // ------------------------------------- + write_bin_log(thd, TRUE, thd->query, thd->query_length); + } + +*** CREATE TABLE table LIKE src-table + + bool mysql_create_like_table( + ... + TABLE_LIST *table, + TABLE_LIST *src_table, + ...) + { + ... + if (thd->current_stmt_binlog_row_based) + { // RBR: In this case we don't replicate temp tables + if (!(create_info->options & HA_LEX_CREATE_TMP_TABLE)) + { + if (src_table->table->s->tmp_table) + { // CREATE normal-table LIKE temp-table: + + // Generate new query without LIKE-part + store_create_info(thd, table, &query, create_info, FALSE); + + // ------------------------------------- + // WL40: To include to tables_info: + // * table (src_table is not included) + // ------------------------------------- + write_bin_log(thd, TRUE, query.ptr(), query.length()); + } + else + { // CREATE normal-table LIKE normal-table + + // ------------------------------------- + // WL40: To include to log_tables_info: + // * table + // * src_table + // ------------------------------------- + write_bin_log(thd, TRUE, thd->query, thd->query_length); + } + } + // CREATE temp-table LIKE ... + // This case is not replicated + } + else + { // SBR: + // ------------------------------------- + // WL40: To include to tables_info: + // * table + // * src_table + // ------------------------------------- + write_bin_log(thd, TRUE, thd->query, thd->query_length); + } + } + +To be continued -=-=(Alexi - Mon, 02 Nov 2009, 11:34)=-=- Worked 2 hours on option 2.5 Worked 2 hours and estimate 48 hours remain (original estimate increased by 50 hours). -=-=(Alexi - Mon, 02 Nov 2009, 11:20)=-=- High-Level Specification modified. --- /tmp/wklog.40.old.4848 2009-11-02 11:20:24.000000000 +0200 +++ /tmp/wklog.40.new.4848 2009-11-02 11:20:24.000000000 +0200 @@ -90,3 +90,25 @@ It might be useful to integrate this with the code that already handles --replicate-ignore-db and similar slave options. +2.5 Extend Query Events With Tables Info +---------------------------------------- + +We could extend query events structure with a tables info - a list of tables +which the query refers to: + + <current query event structure> + tables_info_len + dbase_len dbase + table_len table + ... + dbase_len dbase + table_len table + +Note. In case of <dbase> = current data base, we can set dbase_len = 0 + and dbase = empty because current query event structure already + includes current data base name. + +Note. Possibly it is reasonable also to add a --binlog-with-tables-info + option which defines whether tables info must be included to the + query events. + -=-=(Knielsen - Fri, 14 Aug 2009, 15:47)=-=- High-Level Specification modified. --- /tmp/wklog.40.old.10896 2009-08-14 15:47:39.000000000 +0300 +++ /tmp/wklog.40.new.10896 2009-08-14 15:47:39.000000000 +0300 @@ -72,3 +72,21 @@ /* !mysqlbinlog: updates t1,db3.t2 */ UPDATE t1 LEFT JOIN ... and further processing in mysqlbinlog will be trivial. + +2.4 Implement server functionality to ignore certain tables +----------------------------------------------------------- + +We could add a general facility in the server to ignore certain tables: + + SET SESSION ignored_tables = "db1.t1,db2.t2"; + +This would work similar to --replicate-ignore-table, but in a general way not +restricted to the slave SQL thread. + +It would then be trivial for mysqlbinlog to add such statements at the start +of the output, or probably the user could just do it manually with no need for +additional options for mysqlbinlog. + +It might be useful to integrate this with the code that already handles +--replicate-ignore-db and similar slave options. + -=-=(Psergey - Mon, 10 Aug 2009, 15:41)=-=- High-Level Specification modified. --- /tmp/wklog.40.old.12989 2009-08-10 15:41:23.000000000 +0300 +++ /tmp/wklog.40.new.12989 2009-08-10 15:41:23.000000000 +0300 @@ -1,6 +1,7 @@ - 1. Context ---------- +(See http://askmonty.org/wiki/index.php/Scratch/ReplicationOptions for global +overview) At the moment, the server has these replication slave options: --replicate-do-table=db.tbl -=-=(Guest - Mon, 10 Aug 2009, 14:52)=-=- Dependency created: 39 now depends on 40 -=-=(Guest - Mon, 10 Aug 2009, 14:51)=-=- High Level Description modified. --- /tmp/wklog.40.old.16985 2009-08-10 14:51:59.000000000 +0300 +++ /tmp/wklog.40.new.16985 2009-08-10 14:51:59.000000000 +0300 @@ -1,3 +1,4 @@ Replication slave can be set to filter updates to certain tables with ---replicate-[wild-]{do,ignore}-table options. This task is about adding similar -functionality to mysqlbinlog. +--replicate-[wild-]{do,ignore}-table options. + +This task is about adding similar functionality to mysqlbinlog. -=-=(Guest - Mon, 10 Aug 2009, 14:51)=-=- High-Level Specification modified. --- /tmp/wklog.40.old.16949 2009-08-10 14:51:33.000000000 +0300 +++ /tmp/wklog.40.new.16949 2009-08-10 14:51:33.000000000 +0300 @@ -1 +1,73 @@ +1. Context +---------- +At the moment, the server has these replication slave options: + + --replicate-do-table=db.tbl + --replicate-ignore-table=db.tbl + --replicate-wild-do-table=pattern.pattern + --replicate-wild-ignore-table=pattern.pattern + +They affect both RBR and SBR events. SBR events are checked after the +statement has been parsed, the server iterates over list of used tables and +checks them againist --replicate instructions. + +What is interesting is that this scheme still allows to update the ignored +table through a VIEW. + +2. Table filtering in mysqlbinlog +--------------------------------- + +Per-table filtering of RBR events is easy (as it is relatively easy to extract +the name of the table that the event applies to). + +Per-table filtering of SBR events is hard, as generally it is not apparent +which tables the statement refers to. + +This opens possible options: + +2.1 Put the parser into mysqlbinlog +----------------------------------- +Once we have a full parser in mysqlbinlog, we'll be able to check which tables +are used by a statement, and will allow to show behaviour identical to those +that one obtains when using --replicate-* slave options. + +(It is not clear how much effort is needed to put the parser into mysqlbinlog. +Any guesses?) + + +2.2 Use dumb regexp match +------------------------- +Use a really dumb approach. A query is considered to be modifying table X if +it matches an expression + +CREATE TABLE $tablename +DROP $tablename +UPDATE ...$tablename ... SET // here '...' can't contain the word 'SET' +DELETE ...$tablename ... WHERE // same as above +ALTER TABLE $tablename +.. etc (go get from the grammar) .. + +The advantage over doing the same in awk is that mysqlbinlog will also process +RBR statements, and together with that will provide a working solution for +those who are careful with their table names not mixing with string constants +and such. + +(TODO: string constants are of particular concern as they come from +[potentially hostile] users, unlike e.g. table aliases which come from +[not hostile] developers. Remove also all string constants before attempting +to do match?) + +2.3 Have the master put annotations +----------------------------------- +We could add a master option so that it injects into query a mark that tells +which tables the query will affect, e.g. for the query + + UPDATE t1 LEFT JOIN db3.t2 ON ... WHERE ... + + +the binlog will have + + /* !mysqlbinlog: updates t1,db3.t2 */ UPDATE t1 LEFT JOIN ... + +and further processing in mysqlbinlog will be trivial. DESCRIPTION: Replication slave can be set to filter updates to certain tables with --replicate-[wild-]{do,ignore}-table options. This task is about adding similar functionality to mysqlbinlog. HIGH-LEVEL SPECIFICATION: 1. Context ---------- (See http://askmonty.org/wiki/index.php/Scratch/ReplicationOptions for global overview) At the moment, the server has these replication slave options: --replicate-do-table=db.tbl --replicate-ignore-table=db.tbl --replicate-wild-do-table=pattern.pattern --replicate-wild-ignore-table=pattern.pattern They affect both RBR and SBR events. SBR events are checked after the statement has been parsed, the server iterates over list of used tables and checks them againist --replicate instructions. What is interesting is that this scheme still allows to update the ignored table through a VIEW. 2. Table filtering in mysqlbinlog --------------------------------- Per-table filtering of RBR events is easy (as it is relatively easy to extract the name of the table that the event applies to). Per-table filtering of SBR events is hard, as generally it is not apparent which tables the statement refers to. This opens possible options: 2.1 Put the parser into mysqlbinlog ----------------------------------- Once we have a full parser in mysqlbinlog, we'll be able to check which tables are used by a statement, and will allow to show behaviour identical to those that one obtains when using --replicate-* slave options. (It is not clear how much effort is needed to put the parser into mysqlbinlog. Any guesses?) 2.2 Use dumb regexp match ------------------------- Use a really dumb approach. A query is considered to be modifying table X if it matches an expression CREATE TABLE $tablename DROP $tablename UPDATE ...$tablename ... SET // here '...' can't contain the word 'SET' DELETE ...$tablename ... WHERE // same as above ALTER TABLE $tablename .. etc (go get from the grammar) .. The advantage over doing the same in awk is that mysqlbinlog will also process RBR statements, and together with that will provide a working solution for those who are careful with their table names not mixing with string constants and such. (TODO: string constants are of particular concern as they come from [potentially hostile] users, unlike e.g. table aliases which come from [not hostile] developers. Remove also all string constants before attempting to do match?) 2.3 Have the master put annotations ----------------------------------- We could add a master option so that it injects into query a mark that tells which tables the query will affect, e.g. for the query UPDATE t1 LEFT JOIN db3.t2 ON ... WHERE ... the binlog will have /* !mysqlbinlog: updates t1,db3.t2 */ UPDATE t1 LEFT JOIN ... and further processing in mysqlbinlog will be trivial. 2.4 Implement server functionality to ignore certain tables ----------------------------------------------------------- We could add a general facility in the server to ignore certain tables: SET SESSION ignored_tables = "db1.t1,db2.t2"; This would work similar to --replicate-ignore-table, but in a general way not restricted to the slave SQL thread. It would then be trivial for mysqlbinlog to add such statements at the start of the output, or probably the user could just do it manually with no need for additional options for mysqlbinlog. It might be useful to integrate this with the code that already handles --replicate-ignore-db and similar slave options. 2.5 Extend Query Events With Tables Info ---------------------------------------- We could extend query events structure with a tables info - a list of tables which the query refers to: <current query event structure> tables_info_len dbase_len dbase table_len table ... dbase_len dbase table_len table Note. In case of <dbase> = current data base, we can set dbase_len = 0 and dbase = empty because current query event structure already includes current data base name. Note. Possibly it is reasonable also to add a --binlog-with-tables-info option which defines whether tables info must be included to the query events. LOW-LEVEL DESIGN: OPTION: 2.5 Extend Query Events With Tables Info ================================================ 1. Query_log_event Binary Format ******************************** Changes to be done: Query_log_event binary format --------------------------------- Name Size (bytes) --------------------------------- COMMON HEADER: timestamp 4 type 1 server_id 4 total_size 4 master_position 4 flags 2 --------------------------------- POST HEADER: slave_proxy_id 4 exec_time 4 db_len 1 + query_len 2 (see Note 1) error_code 2 status_vars_len 2 + tables_info_len 2 (see Note 2) --------------------------------- BODY: status_vars status_vars_len - db db_len + 1 + db db_len (see Note 3) query query_len + tables_info tables_info binary format --------------------------------- Name Size (bytes) --------------------------------- db_len 1 (see Note 4) db db_len table_name_len 1 table_name table_name_len ... db_len 1 db db_len table_name_len 1 table_name table_name_len NOTES 1. Currently Query_log_event format doesn't include 'query_len' because it considers the query to extent to the end of the event. 2. If tables_info is not included in the event (--binlog-with-tables-info option), tables_info_len = 0. 3. The trailing zero is redundant since the length is already known. 4. In case of db = current db, db_len = 0 and db = empty, because current db is already included in the current event format. 2. Where to get tables info from? ********************************* 2.1. Case study: CREATE TABLE ****************************** *** CREATE TABLE table [SELECT ...] bool mysql_create_table_no_lock( THD *thd, const char *db, const char *table_name, ...) { ... // ------------------------------------- // WL40: To be included in tables_info: // * db, table_name // * thd->lex->query_tables (tables refered to in // the select-part; empty if no select-part) // ------------------------------------- write_bin_log(thd, TRUE, thd->query, thd->query_length); } *** CREATE TABLE table LIKE src-table bool mysql_create_like_table( ... TABLE_LIST *table, TABLE_LIST *src_table, ...) { ... if (thd->current_stmt_binlog_row_based) { // RBR: In this case we don't replicate temp tables if (!(create_info->options & HA_LEX_CREATE_TMP_TABLE)) { if (src_table->table->s->tmp_table) { // CREATE normal-table LIKE temp-table: // Generate new query without LIKE-part store_create_info(thd, table, &query, create_info, FALSE); // ------------------------------------- // WL40: To include to tables_info: // * table (src_table is not included) // ------------------------------------- write_bin_log(thd, TRUE, query.ptr(), query.length()); } else { // CREATE normal-table LIKE normal-table // ------------------------------------- // WL40: To include to log_tables_info: // * table // * src_table // ------------------------------------- write_bin_log(thd, TRUE, thd->query, thd->query_length); } } // CREATE temp-table LIKE ... // This case is not replicated } else { // SBR: // ------------------------------------- // WL40: To include to tables_info: // * table // * src_table // ------------------------------------- write_bin_log(thd, TRUE, thd->query, thd->query_length); } } To be continued ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v3.5.9)

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[Maria-developers] Rewrite of the free documentation to make it about MariaDB, not MySQL
by Henrik Ingo 03 Nov '09

03 Nov '09

Daniel I glanced through some of the commits today and noticed Kristian committing the new version of MySQL 5.1.38 documentation (man pages and other free docs). The docs seem to include lots of references to where you can download MySQL rpm's, where you can buy MySQL support, Suns support lifecycle policies, etc. As part of your documentation work, could you be in touch with Kristian and find out how you could help in cleaning that up. Meaning: Either remove such sections, or replace with relevant MariaDB information. While at it, I'd like to review the Readme file of MariaDB. Could you help me with that (ie extract it from bzr and work with me to rewrite it - so that I can just participate by email). The Readme file we should fix before GA release. The other docs are only semi-urgent. henrik -- email: henrik.ingo(a)avoinelama.fi tel: +358-40-5697354 www: www.avoinelama.fi/~hingo book: www.openlife.cc

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[Maria-developers] New (by Sanja): Add info to engine description (61)
by worklog-noreply＠askmonty.org 02 Nov '09

02 Nov '09

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Add info to engine description CREATION DATE..: Mon, 02 Nov 2009, 22:58 SUPERVISOR.....: Monty IMPLEMENTOR....: Sanja COPIES TO......: CATEGORY.......: Server-BackLog TASK ID........: 61 (http://askmonty.org/worklog/?tid=61) VERSION........: Server-5.1 STATUS.........: Assigned PRIORITY.......: 60 WORKED HOURS...: 0 ESTIMATE.......: 5 (hours remain) ORIG. ESTIMATE.: 5 PROGRESS NOTES: DESCRIPTION: Add additional information about engine and show it in SHOW ENGINES: License (PROPRIETARY, GPL, BSD) (it is present just have to be shown) Maturity (TEST, ALPHA, BETA, GAMMA, RELEASE) Version (just string from engine developer like "0.99 betta", better if it will be monotonically increasing in terms of alphabetical sort). ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v3.5.9)

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[Maria-developers] New (by Sanja): Add info to engine description (61)
by worklog-noreply＠askmonty.org 02 Nov '09

02 Nov '09

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Add info to engine description CREATION DATE..: Mon, 02 Nov 2009, 22:58 SUPERVISOR.....: Monty IMPLEMENTOR....: Sanja COPIES TO......: CATEGORY.......: Server-BackLog TASK ID........: 61 (http://askmonty.org/worklog/?tid=61) VERSION........: Server-5.1 STATUS.........: Assigned PRIORITY.......: 60 WORKED HOURS...: 0 ESTIMATE.......: 5 (hours remain) ORIG. ESTIMATE.: 5 PROGRESS NOTES: DESCRIPTION: Add additional information about engine and show it in SHOW ENGINES: License (PROPRIETARY, GPL, BSD) (it is present just have to be shown) Maturity (TEST, ALPHA, BETA, GAMMA, RELEASE) Version (just string from engine developer like "0.99 betta", better if it will be monotonically increasing in terms of alphabetical sort). ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v3.5.9)

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[Maria-developers] [Branch ~maria-captains/maria/5.1] Rev 2757: Fixed federatedx building under windows
by noreply＠launchpad.net 02 Nov '09

02 Nov '09

------------------------------------------------------------ revno: 2757 committer: sanja(a)askmonty.org branch nick: work-maria-5.1-win64 timestamp: Mon 2009-11-02 21:17:58 +0200 message: Fixed federatedx building under windows modified: storage/federatedx/CMakeLists.txt -- lp:maria https://code.launchpad.net/~maria-captains/maria/5.1 Your team Maria developers is subscribed to branch lp:maria. To unsubscribe from this branch go to https://code.launchpad.net/~maria-captains/maria/5.1/+edit-subscription.

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[Maria-developers] FYI: maria-5.1-merge renamed to 5.1-release
by Sergey Petrunya 02 Nov '09

02 Nov '09

Hi! This is to inform that MariaDB release branch tree, which was at a location with a counter-intuitive name of lp:~maria-captains/maria/maria-5.1-merge has been moved to lp:~maria-captains/maria/5.1-release Buildbot has been repointed to the new tree. BR Sergey -- Sergey Petrunia, Software Developer Monty Program AB, http://askmonty.org Blog: http://s.petrunia.net/blog

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[Maria-developers] Progress (by Alexi): Add a mysqlbinlog option to filter updates to certain tables (40)
by worklog-noreply＠askmonty.org 02 Nov '09

02 Nov '09

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Add a mysqlbinlog option to filter updates to certain tables CREATION DATE..: Mon, 10 Aug 2009, 13:25 SUPERVISOR.....: Monty IMPLEMENTOR....: COPIES TO......: Psergey CATEGORY.......: Server-RawIdeaBin TASK ID........: 40 (http://askmonty.org/worklog/?tid=40) VERSION........: Server-9.x STATUS.........: Un-Assigned PRIORITY.......: 60 WORKED HOURS...: 2 ESTIMATE.......: 48 (hours remain) ORIG. ESTIMATE.: 48 PROGRESS NOTES: -=-=(Alexi - Mon, 02 Nov 2009, 11:34)=-=- Worked 2 hours on option 2.5 Worked 2 hours and estimate 48 hours remain (original estimate increased by 50 hours). -=-=(Alexi - Mon, 02 Nov 2009, 11:20)=-=- High-Level Specification modified. --- /tmp/wklog.40.old.4848 2009-11-02 11:20:24.000000000 +0200 +++ /tmp/wklog.40.new.4848 2009-11-02 11:20:24.000000000 +0200 @@ -90,3 +90,25 @@ It might be useful to integrate this with the code that already handles --replicate-ignore-db and similar slave options. +2.5 Extend Query Events With Tables Info +---------------------------------------- + +We could extend query events structure with a tables info - a list of tables +which the query refers to: + + <current query event structure> + tables_info_len + dbase_len dbase + table_len table + ... + dbase_len dbase + table_len table + +Note. In case of <dbase> = current data base, we can set dbase_len = 0 + and dbase = empty because current query event structure already + includes current data base name. + +Note. Possibly it is reasonable also to add a --binlog-with-tables-info + option which defines whether tables info must be included to the + query events. + -=-=(Knielsen - Fri, 14 Aug 2009, 15:47)=-=- High-Level Specification modified. --- /tmp/wklog.40.old.10896 2009-08-14 15:47:39.000000000 +0300 +++ /tmp/wklog.40.new.10896 2009-08-14 15:47:39.000000000 +0300 @@ -72,3 +72,21 @@ /* !mysqlbinlog: updates t1,db3.t2 */ UPDATE t1 LEFT JOIN ... and further processing in mysqlbinlog will be trivial. + +2.4 Implement server functionality to ignore certain tables +----------------------------------------------------------- + +We could add a general facility in the server to ignore certain tables: + + SET SESSION ignored_tables = "db1.t1,db2.t2"; + +This would work similar to --replicate-ignore-table, but in a general way not +restricted to the slave SQL thread. + +It would then be trivial for mysqlbinlog to add such statements at the start +of the output, or probably the user could just do it manually with no need for +additional options for mysqlbinlog. + +It might be useful to integrate this with the code that already handles +--replicate-ignore-db and similar slave options. + -=-=(Psergey - Mon, 10 Aug 2009, 15:41)=-=- High-Level Specification modified. --- /tmp/wklog.40.old.12989 2009-08-10 15:41:23.000000000 +0300 +++ /tmp/wklog.40.new.12989 2009-08-10 15:41:23.000000000 +0300 @@ -1,6 +1,7 @@ - 1. Context ---------- +(See http://askmonty.org/wiki/index.php/Scratch/ReplicationOptions for global +overview) At the moment, the server has these replication slave options: --replicate-do-table=db.tbl -=-=(Guest - Mon, 10 Aug 2009, 14:52)=-=- Dependency created: 39 now depends on 40 -=-=(Guest - Mon, 10 Aug 2009, 14:51)=-=- High Level Description modified. --- /tmp/wklog.40.old.16985 2009-08-10 14:51:59.000000000 +0300 +++ /tmp/wklog.40.new.16985 2009-08-10 14:51:59.000000000 +0300 @@ -1,3 +1,4 @@ Replication slave can be set to filter updates to certain tables with ---replicate-[wild-]{do,ignore}-table options. This task is about adding similar -functionality to mysqlbinlog. +--replicate-[wild-]{do,ignore}-table options. + +This task is about adding similar functionality to mysqlbinlog. -=-=(Guest - Mon, 10 Aug 2009, 14:51)=-=- High-Level Specification modified. --- /tmp/wklog.40.old.16949 2009-08-10 14:51:33.000000000 +0300 +++ /tmp/wklog.40.new.16949 2009-08-10 14:51:33.000000000 +0300 @@ -1 +1,73 @@ +1. Context +---------- +At the moment, the server has these replication slave options: + + --replicate-do-table=db.tbl + --replicate-ignore-table=db.tbl + --replicate-wild-do-table=pattern.pattern + --replicate-wild-ignore-table=pattern.pattern + +They affect both RBR and SBR events. SBR events are checked after the +statement has been parsed, the server iterates over list of used tables and +checks them againist --replicate instructions. + +What is interesting is that this scheme still allows to update the ignored +table through a VIEW. + +2. Table filtering in mysqlbinlog +--------------------------------- + +Per-table filtering of RBR events is easy (as it is relatively easy to extract +the name of the table that the event applies to). + +Per-table filtering of SBR events is hard, as generally it is not apparent +which tables the statement refers to. + +This opens possible options: + +2.1 Put the parser into mysqlbinlog +----------------------------------- +Once we have a full parser in mysqlbinlog, we'll be able to check which tables +are used by a statement, and will allow to show behaviour identical to those +that one obtains when using --replicate-* slave options. + +(It is not clear how much effort is needed to put the parser into mysqlbinlog. +Any guesses?) + + +2.2 Use dumb regexp match +------------------------- +Use a really dumb approach. A query is considered to be modifying table X if +it matches an expression + +CREATE TABLE $tablename +DROP $tablename +UPDATE ...$tablename ... SET // here '...' can't contain the word 'SET' +DELETE ...$tablename ... WHERE // same as above +ALTER TABLE $tablename +.. etc (go get from the grammar) .. + +The advantage over doing the same in awk is that mysqlbinlog will also process +RBR statements, and together with that will provide a working solution for +those who are careful with their table names not mixing with string constants +and such. + +(TODO: string constants are of particular concern as they come from +[potentially hostile] users, unlike e.g. table aliases which come from +[not hostile] developers. Remove also all string constants before attempting +to do match?) + +2.3 Have the master put annotations +----------------------------------- +We could add a master option so that it injects into query a mark that tells +which tables the query will affect, e.g. for the query + + UPDATE t1 LEFT JOIN db3.t2 ON ... WHERE ... + + +the binlog will have + + /* !mysqlbinlog: updates t1,db3.t2 */ UPDATE t1 LEFT JOIN ... + +and further processing in mysqlbinlog will be trivial. DESCRIPTION: Replication slave can be set to filter updates to certain tables with --replicate-[wild-]{do,ignore}-table options. This task is about adding similar functionality to mysqlbinlog. HIGH-LEVEL SPECIFICATION: 1. Context ---------- (See http://askmonty.org/wiki/index.php/Scratch/ReplicationOptions for global overview) At the moment, the server has these replication slave options: --replicate-do-table=db.tbl --replicate-ignore-table=db.tbl --replicate-wild-do-table=pattern.pattern --replicate-wild-ignore-table=pattern.pattern They affect both RBR and SBR events. SBR events are checked after the statement has been parsed, the server iterates over list of used tables and checks them againist --replicate instructions. What is interesting is that this scheme still allows to update the ignored table through a VIEW. 2. Table filtering in mysqlbinlog --------------------------------- Per-table filtering of RBR events is easy (as it is relatively easy to extract the name of the table that the event applies to). Per-table filtering of SBR events is hard, as generally it is not apparent which tables the statement refers to. This opens possible options: 2.1 Put the parser into mysqlbinlog ----------------------------------- Once we have a full parser in mysqlbinlog, we'll be able to check which tables are used by a statement, and will allow to show behaviour identical to those that one obtains when using --replicate-* slave options. (It is not clear how much effort is needed to put the parser into mysqlbinlog. Any guesses?) 2.2 Use dumb regexp match ------------------------- Use a really dumb approach. A query is considered to be modifying table X if it matches an expression CREATE TABLE $tablename DROP $tablename UPDATE ...$tablename ... SET // here '...' can't contain the word 'SET' DELETE ...$tablename ... WHERE // same as above ALTER TABLE $tablename .. etc (go get from the grammar) .. The advantage over doing the same in awk is that mysqlbinlog will also process RBR statements, and together with that will provide a working solution for those who are careful with their table names not mixing with string constants and such. (TODO: string constants are of particular concern as they come from [potentially hostile] users, unlike e.g. table aliases which come from [not hostile] developers. Remove also all string constants before attempting to do match?) 2.3 Have the master put annotations ----------------------------------- We could add a master option so that it injects into query a mark that tells which tables the query will affect, e.g. for the query UPDATE t1 LEFT JOIN db3.t2 ON ... WHERE ... the binlog will have /* !mysqlbinlog: updates t1,db3.t2 */ UPDATE t1 LEFT JOIN ... and further processing in mysqlbinlog will be trivial. 2.4 Implement server functionality to ignore certain tables ----------------------------------------------------------- We could add a general facility in the server to ignore certain tables: SET SESSION ignored_tables = "db1.t1,db2.t2"; This would work similar to --replicate-ignore-table, but in a general way not restricted to the slave SQL thread. It would then be trivial for mysqlbinlog to add such statements at the start of the output, or probably the user could just do it manually with no need for additional options for mysqlbinlog. It might be useful to integrate this with the code that already handles --replicate-ignore-db and similar slave options. 2.5 Extend Query Events With Tables Info ---------------------------------------- We could extend query events structure with a tables info - a list of tables which the query refers to: <current query event structure> tables_info_len dbase_len dbase table_len table ... dbase_len dbase table_len table Note. In case of <dbase> = current data base, we can set dbase_len = 0 and dbase = empty because current query event structure already includes current data base name. Note. Possibly it is reasonable also to add a --binlog-with-tables-info option which defines whether tables info must be included to the query events. ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v3.5.9)

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[Maria-developers] Progress (by Alexi): Add a mysqlbinlog option to filter updates to certain tables (40)
by worklog-noreply＠askmonty.org 02 Nov '09

02 Nov '09

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Add a mysqlbinlog option to filter updates to certain tables CREATION DATE..: Mon, 10 Aug 2009, 13:25 SUPERVISOR.....: Monty IMPLEMENTOR....: COPIES TO......: Psergey CATEGORY.......: Server-RawIdeaBin TASK ID........: 40 (http://askmonty.org/worklog/?tid=40) VERSION........: Server-9.x STATUS.........: Un-Assigned PRIORITY.......: 60 WORKED HOURS...: 2 ESTIMATE.......: 48 (hours remain) ORIG. ESTIMATE.: 48 PROGRESS NOTES: -=-=(Alexi - Mon, 02 Nov 2009, 11:34)=-=- Worked 2 hours on option 2.5 Worked 2 hours and estimate 48 hours remain (original estimate increased by 50 hours). -=-=(Alexi - Mon, 02 Nov 2009, 11:20)=-=- High-Level Specification modified. --- /tmp/wklog.40.old.4848 2009-11-02 11:20:24.000000000 +0200 +++ /tmp/wklog.40.new.4848 2009-11-02 11:20:24.000000000 +0200 @@ -90,3 +90,25 @@ It might be useful to integrate this with the code that already handles --replicate-ignore-db and similar slave options. +2.5 Extend Query Events With Tables Info +---------------------------------------- + +We could extend query events structure with a tables info - a list of tables +which the query refers to: + + <current query event structure> + tables_info_len + dbase_len dbase + table_len table + ... + dbase_len dbase + table_len table + +Note. In case of <dbase> = current data base, we can set dbase_len = 0 + and dbase = empty because current query event structure already + includes current data base name. + +Note. Possibly it is reasonable also to add a --binlog-with-tables-info + option which defines whether tables info must be included to the + query events. + -=-=(Knielsen - Fri, 14 Aug 2009, 15:47)=-=- High-Level Specification modified. --- /tmp/wklog.40.old.10896 2009-08-14 15:47:39.000000000 +0300 +++ /tmp/wklog.40.new.10896 2009-08-14 15:47:39.000000000 +0300 @@ -72,3 +72,21 @@ /* !mysqlbinlog: updates t1,db3.t2 */ UPDATE t1 LEFT JOIN ... and further processing in mysqlbinlog will be trivial. + +2.4 Implement server functionality to ignore certain tables +----------------------------------------------------------- + +We could add a general facility in the server to ignore certain tables: + + SET SESSION ignored_tables = "db1.t1,db2.t2"; + +This would work similar to --replicate-ignore-table, but in a general way not +restricted to the slave SQL thread. + +It would then be trivial for mysqlbinlog to add such statements at the start +of the output, or probably the user could just do it manually with no need for +additional options for mysqlbinlog. + +It might be useful to integrate this with the code that already handles +--replicate-ignore-db and similar slave options. + -=-=(Psergey - Mon, 10 Aug 2009, 15:41)=-=- High-Level Specification modified. --- /tmp/wklog.40.old.12989 2009-08-10 15:41:23.000000000 +0300 +++ /tmp/wklog.40.new.12989 2009-08-10 15:41:23.000000000 +0300 @@ -1,6 +1,7 @@ - 1. Context ---------- +(See http://askmonty.org/wiki/index.php/Scratch/ReplicationOptions for global +overview) At the moment, the server has these replication slave options: --replicate-do-table=db.tbl -=-=(Guest - Mon, 10 Aug 2009, 14:52)=-=- Dependency created: 39 now depends on 40 -=-=(Guest - Mon, 10 Aug 2009, 14:51)=-=- High Level Description modified. --- /tmp/wklog.40.old.16985 2009-08-10 14:51:59.000000000 +0300 +++ /tmp/wklog.40.new.16985 2009-08-10 14:51:59.000000000 +0300 @@ -1,3 +1,4 @@ Replication slave can be set to filter updates to certain tables with ---replicate-[wild-]{do,ignore}-table options. This task is about adding similar -functionality to mysqlbinlog. +--replicate-[wild-]{do,ignore}-table options. + +This task is about adding similar functionality to mysqlbinlog. -=-=(Guest - Mon, 10 Aug 2009, 14:51)=-=- High-Level Specification modified. --- /tmp/wklog.40.old.16949 2009-08-10 14:51:33.000000000 +0300 +++ /tmp/wklog.40.new.16949 2009-08-10 14:51:33.000000000 +0300 @@ -1 +1,73 @@ +1. Context +---------- +At the moment, the server has these replication slave options: + + --replicate-do-table=db.tbl + --replicate-ignore-table=db.tbl + --replicate-wild-do-table=pattern.pattern + --replicate-wild-ignore-table=pattern.pattern + +They affect both RBR and SBR events. SBR events are checked after the +statement has been parsed, the server iterates over list of used tables and +checks them againist --replicate instructions. + +What is interesting is that this scheme still allows to update the ignored +table through a VIEW. + +2. Table filtering in mysqlbinlog +--------------------------------- + +Per-table filtering of RBR events is easy (as it is relatively easy to extract +the name of the table that the event applies to). + +Per-table filtering of SBR events is hard, as generally it is not apparent +which tables the statement refers to. + +This opens possible options: + +2.1 Put the parser into mysqlbinlog +----------------------------------- +Once we have a full parser in mysqlbinlog, we'll be able to check which tables +are used by a statement, and will allow to show behaviour identical to those +that one obtains when using --replicate-* slave options. + +(It is not clear how much effort is needed to put the parser into mysqlbinlog. +Any guesses?) + + +2.2 Use dumb regexp match +------------------------- +Use a really dumb approach. A query is considered to be modifying table X if +it matches an expression + +CREATE TABLE $tablename +DROP $tablename +UPDATE ...$tablename ... SET // here '...' can't contain the word 'SET' +DELETE ...$tablename ... WHERE // same as above +ALTER TABLE $tablename +.. etc (go get from the grammar) .. + +The advantage over doing the same in awk is that mysqlbinlog will also process +RBR statements, and together with that will provide a working solution for +those who are careful with their table names not mixing with string constants +and such. + +(TODO: string constants are of particular concern as they come from +[potentially hostile] users, unlike e.g. table aliases which come from +[not hostile] developers. Remove also all string constants before attempting +to do match?) + +2.3 Have the master put annotations +----------------------------------- +We could add a master option so that it injects into query a mark that tells +which tables the query will affect, e.g. for the query + + UPDATE t1 LEFT JOIN db3.t2 ON ... WHERE ... + + +the binlog will have + + /* !mysqlbinlog: updates t1,db3.t2 */ UPDATE t1 LEFT JOIN ... + +and further processing in mysqlbinlog will be trivial. DESCRIPTION: Replication slave can be set to filter updates to certain tables with --replicate-[wild-]{do,ignore}-table options. This task is about adding similar functionality to mysqlbinlog. HIGH-LEVEL SPECIFICATION: 1. Context ---------- (See http://askmonty.org/wiki/index.php/Scratch/ReplicationOptions for global overview) At the moment, the server has these replication slave options: --replicate-do-table=db.tbl --replicate-ignore-table=db.tbl --replicate-wild-do-table=pattern.pattern --replicate-wild-ignore-table=pattern.pattern They affect both RBR and SBR events. SBR events are checked after the statement has been parsed, the server iterates over list of used tables and checks them againist --replicate instructions. What is interesting is that this scheme still allows to update the ignored table through a VIEW. 2. Table filtering in mysqlbinlog --------------------------------- Per-table filtering of RBR events is easy (as it is relatively easy to extract the name of the table that the event applies to). Per-table filtering of SBR events is hard, as generally it is not apparent which tables the statement refers to. This opens possible options: 2.1 Put the parser into mysqlbinlog ----------------------------------- Once we have a full parser in mysqlbinlog, we'll be able to check which tables are used by a statement, and will allow to show behaviour identical to those that one obtains when using --replicate-* slave options. (It is not clear how much effort is needed to put the parser into mysqlbinlog. Any guesses?) 2.2 Use dumb regexp match ------------------------- Use a really dumb approach. A query is considered to be modifying table X if it matches an expression CREATE TABLE $tablename DROP $tablename UPDATE ...$tablename ... SET // here '...' can't contain the word 'SET' DELETE ...$tablename ... WHERE // same as above ALTER TABLE $tablename .. etc (go get from the grammar) .. The advantage over doing the same in awk is that mysqlbinlog will also process RBR statements, and together with that will provide a working solution for those who are careful with their table names not mixing with string constants and such. (TODO: string constants are of particular concern as they come from [potentially hostile] users, unlike e.g. table aliases which come from [not hostile] developers. Remove also all string constants before attempting to do match?) 2.3 Have the master put annotations ----------------------------------- We could add a master option so that it injects into query a mark that tells which tables the query will affect, e.g. for the query UPDATE t1 LEFT JOIN db3.t2 ON ... WHERE ... the binlog will have /* !mysqlbinlog: updates t1,db3.t2 */ UPDATE t1 LEFT JOIN ... and further processing in mysqlbinlog will be trivial. 2.4 Implement server functionality to ignore certain tables ----------------------------------------------------------- We could add a general facility in the server to ignore certain tables: SET SESSION ignored_tables = "db1.t1,db2.t2"; This would work similar to --replicate-ignore-table, but in a general way not restricted to the slave SQL thread. It would then be trivial for mysqlbinlog to add such statements at the start of the output, or probably the user could just do it manually with no need for additional options for mysqlbinlog. It might be useful to integrate this with the code that already handles --replicate-ignore-db and similar slave options. 2.5 Extend Query Events With Tables Info ---------------------------------------- We could extend query events structure with a tables info - a list of tables which the query refers to: <current query event structure> tables_info_len dbase_len dbase table_len table ... dbase_len dbase table_len table Note. In case of <dbase> = current data base, we can set dbase_len = 0 and dbase = empty because current query event structure already includes current data base name. Note. Possibly it is reasonable also to add a --binlog-with-tables-info option which defines whether tables info must be included to the query events. ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v3.5.9)

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[Maria-developers] bzr commit into MariaDB 5.1, with Maria 1.5:maria branch (monty:2748)
by Michael Widenius 02 Nov '09

02 Nov '09

#At lp:maria based on revid:knielsen@knielsen-hq.org-20091016150136-qeazrj6znra8k9tt 2748 Michael Widenius 2009-11-02 Fixed problem with schema tables and DECIMAL modified: sql/sql_show.cc per-file messages: sql/sql_show.cc Change decimal item to type holder, to be able to define the decimals and max_length for the DECIMAL field from the schema specification instead of the value of the item. === modified file 'sql/sql_show.cc' --- a/sql/sql_show.cc 2009-10-15 21:38:29 +0000 +++ b/sql/sql_show.cc 2009-11-02 09:30:21 +0000 @@ -5608,6 +5608,12 @@ TABLE *create_schema_table(THD *thd, TAB { DBUG_RETURN(0); } + /* + Create a type holder, as we want the type of the item to defined + the type of the object, not the value + */ + if (!(item= new Item_type_holder(thd, item))) + DBUG_RETURN(0); item->unsigned_flag= (fields_info->field_flags & MY_I_S_UNSIGNED); item->decimals= fields_info->field_length%10; item->max_length= (fields_info->field_length/100)%100;

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[Maria-developers] Updated (by Alexi): Add a mysqlbinlog option to filter updates to certain tables (40)
by worklog-noreply＠askmonty.org 02 Nov '09

02 Nov '09

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Add a mysqlbinlog option to filter updates to certain tables CREATION DATE..: Mon, 10 Aug 2009, 13:25 SUPERVISOR.....: Monty IMPLEMENTOR....: COPIES TO......: Psergey CATEGORY.......: Server-RawIdeaBin TASK ID........: 40 (http://askmonty.org/worklog/?tid=40) VERSION........: Server-9.x STATUS.........: Un-Assigned PRIORITY.......: 60 WORKED HOURS...: 0 ESTIMATE.......: 0 (hours remain) ORIG. ESTIMATE.: 0 PROGRESS NOTES: -=-=(Alexi - Mon, 02 Nov 2009, 11:20)=-=- High-Level Specification modified. --- /tmp/wklog.40.old.4848 2009-11-02 11:20:24.000000000 +0200 +++ /tmp/wklog.40.new.4848 2009-11-02 11:20:24.000000000 +0200 @@ -90,3 +90,25 @@ It might be useful to integrate this with the code that already handles --replicate-ignore-db and similar slave options. +2.5 Extend Query Events With Tables Info +---------------------------------------- + +We could extend query events structure with a tables info - a list of tables +which the query refers to: + + <current query event structure> + tables_info_len + dbase_len dbase + table_len table + ... + dbase_len dbase + table_len table + +Note. In case of <dbase> = current data base, we can set dbase_len = 0 + and dbase = empty because current query event structure already + includes current data base name. + +Note. Possibly it is reasonable also to add a --binlog-with-tables-info + option which defines whether tables info must be included to the + query events. + -=-=(Knielsen - Fri, 14 Aug 2009, 15:47)=-=- High-Level Specification modified. --- /tmp/wklog.40.old.10896 2009-08-14 15:47:39.000000000 +0300 +++ /tmp/wklog.40.new.10896 2009-08-14 15:47:39.000000000 +0300 @@ -72,3 +72,21 @@ /* !mysqlbinlog: updates t1,db3.t2 */ UPDATE t1 LEFT JOIN ... and further processing in mysqlbinlog will be trivial. + +2.4 Implement server functionality to ignore certain tables +----------------------------------------------------------- + +We could add a general facility in the server to ignore certain tables: + + SET SESSION ignored_tables = "db1.t1,db2.t2"; + +This would work similar to --replicate-ignore-table, but in a general way not +restricted to the slave SQL thread. + +It would then be trivial for mysqlbinlog to add such statements at the start +of the output, or probably the user could just do it manually with no need for +additional options for mysqlbinlog. + +It might be useful to integrate this with the code that already handles +--replicate-ignore-db and similar slave options. + -=-=(Psergey - Mon, 10 Aug 2009, 15:41)=-=- High-Level Specification modified. --- /tmp/wklog.40.old.12989 2009-08-10 15:41:23.000000000 +0300 +++ /tmp/wklog.40.new.12989 2009-08-10 15:41:23.000000000 +0300 @@ -1,6 +1,7 @@ - 1. Context ---------- +(See http://askmonty.org/wiki/index.php/Scratch/ReplicationOptions for global +overview) At the moment, the server has these replication slave options: --replicate-do-table=db.tbl -=-=(Guest - Mon, 10 Aug 2009, 14:52)=-=- Dependency created: 39 now depends on 40 -=-=(Guest - Mon, 10 Aug 2009, 14:51)=-=- High Level Description modified. --- /tmp/wklog.40.old.16985 2009-08-10 14:51:59.000000000 +0300 +++ /tmp/wklog.40.new.16985 2009-08-10 14:51:59.000000000 +0300 @@ -1,3 +1,4 @@ Replication slave can be set to filter updates to certain tables with ---replicate-[wild-]{do,ignore}-table options. This task is about adding similar -functionality to mysqlbinlog. +--replicate-[wild-]{do,ignore}-table options. + +This task is about adding similar functionality to mysqlbinlog. -=-=(Guest - Mon, 10 Aug 2009, 14:51)=-=- High-Level Specification modified. --- /tmp/wklog.40.old.16949 2009-08-10 14:51:33.000000000 +0300 +++ /tmp/wklog.40.new.16949 2009-08-10 14:51:33.000000000 +0300 @@ -1 +1,73 @@ +1. Context +---------- +At the moment, the server has these replication slave options: + + --replicate-do-table=db.tbl + --replicate-ignore-table=db.tbl + --replicate-wild-do-table=pattern.pattern + --replicate-wild-ignore-table=pattern.pattern + +They affect both RBR and SBR events. SBR events are checked after the +statement has been parsed, the server iterates over list of used tables and +checks them againist --replicate instructions. + +What is interesting is that this scheme still allows to update the ignored +table through a VIEW. + +2. Table filtering in mysqlbinlog +--------------------------------- + +Per-table filtering of RBR events is easy (as it is relatively easy to extract +the name of the table that the event applies to). + +Per-table filtering of SBR events is hard, as generally it is not apparent +which tables the statement refers to. + +This opens possible options: + +2.1 Put the parser into mysqlbinlog +----------------------------------- +Once we have a full parser in mysqlbinlog, we'll be able to check which tables +are used by a statement, and will allow to show behaviour identical to those +that one obtains when using --replicate-* slave options. + +(It is not clear how much effort is needed to put the parser into mysqlbinlog. +Any guesses?) + + +2.2 Use dumb regexp match +------------------------- +Use a really dumb approach. A query is considered to be modifying table X if +it matches an expression + +CREATE TABLE $tablename +DROP $tablename +UPDATE ...$tablename ... SET // here '...' can't contain the word 'SET' +DELETE ...$tablename ... WHERE // same as above +ALTER TABLE $tablename +.. etc (go get from the grammar) .. + +The advantage over doing the same in awk is that mysqlbinlog will also process +RBR statements, and together with that will provide a working solution for +those who are careful with their table names not mixing with string constants +and such. + +(TODO: string constants are of particular concern as they come from +[potentially hostile] users, unlike e.g. table aliases which come from +[not hostile] developers. Remove also all string constants before attempting +to do match?) + +2.3 Have the master put annotations +----------------------------------- +We could add a master option so that it injects into query a mark that tells +which tables the query will affect, e.g. for the query + + UPDATE t1 LEFT JOIN db3.t2 ON ... WHERE ... + + +the binlog will have + + /* !mysqlbinlog: updates t1,db3.t2 */ UPDATE t1 LEFT JOIN ... + +and further processing in mysqlbinlog will be trivial. DESCRIPTION: Replication slave can be set to filter updates to certain tables with --replicate-[wild-]{do,ignore}-table options. This task is about adding similar functionality to mysqlbinlog. HIGH-LEVEL SPECIFICATION: 1. Context ---------- (See http://askmonty.org/wiki/index.php/Scratch/ReplicationOptions for global overview) At the moment, the server has these replication slave options: --replicate-do-table=db.tbl --replicate-ignore-table=db.tbl --replicate-wild-do-table=pattern.pattern --replicate-wild-ignore-table=pattern.pattern They affect both RBR and SBR events. SBR events are checked after the statement has been parsed, the server iterates over list of used tables and checks them againist --replicate instructions. What is interesting is that this scheme still allows to update the ignored table through a VIEW. 2. Table filtering in mysqlbinlog --------------------------------- Per-table filtering of RBR events is easy (as it is relatively easy to extract the name of the table that the event applies to). Per-table filtering of SBR events is hard, as generally it is not apparent which tables the statement refers to. This opens possible options: 2.1 Put the parser into mysqlbinlog ----------------------------------- Once we have a full parser in mysqlbinlog, we'll be able to check which tables are used by a statement, and will allow to show behaviour identical to those that one obtains when using --replicate-* slave options. (It is not clear how much effort is needed to put the parser into mysqlbinlog. Any guesses?) 2.2 Use dumb regexp match ------------------------- Use a really dumb approach. A query is considered to be modifying table X if it matches an expression CREATE TABLE $tablename DROP $tablename UPDATE ...$tablename ... SET // here '...' can't contain the word 'SET' DELETE ...$tablename ... WHERE // same as above ALTER TABLE $tablename .. etc (go get from the grammar) .. The advantage over doing the same in awk is that mysqlbinlog will also process RBR statements, and together with that will provide a working solution for those who are careful with their table names not mixing with string constants and such. (TODO: string constants are of particular concern as they come from [potentially hostile] users, unlike e.g. table aliases which come from [not hostile] developers. Remove also all string constants before attempting to do match?) 2.3 Have the master put annotations ----------------------------------- We could add a master option so that it injects into query a mark that tells which tables the query will affect, e.g. for the query UPDATE t1 LEFT JOIN db3.t2 ON ... WHERE ... the binlog will have /* !mysqlbinlog: updates t1,db3.t2 */ UPDATE t1 LEFT JOIN ... and further processing in mysqlbinlog will be trivial. 2.4 Implement server functionality to ignore certain tables ----------------------------------------------------------- We could add a general facility in the server to ignore certain tables: SET SESSION ignored_tables = "db1.t1,db2.t2"; This would work similar to --replicate-ignore-table, but in a general way not restricted to the slave SQL thread. It would then be trivial for mysqlbinlog to add such statements at the start of the output, or probably the user could just do it manually with no need for additional options for mysqlbinlog. It might be useful to integrate this with the code that already handles --replicate-ignore-db and similar slave options. 2.5 Extend Query Events With Tables Info ---------------------------------------- We could extend query events structure with a tables info - a list of tables which the query refers to: <current query event structure> tables_info_len dbase_len dbase table_len table ... dbase_len dbase table_len table Note. In case of <dbase> = current data base, we can set dbase_len = 0 and dbase = empty because current query event structure already includes current data base name. Note. Possibly it is reasonable also to add a --binlog-with-tables-info option which defines whether tables info must be included to the query events. ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v3.5.9)

1 0