-----------------------------------------------------------------------
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 - Sun, 08 Nov 2009, 15:18)=-=-
Low Level Design modified.
--- /tmp/wklog.40.old.15787 2009-11-08 15:18:11.000000000 +0200
+++ /tmp/wklog.40.new.15787 2009-11-08 15:18:11.000000000 +0200
@@ -62,7 +62,7 @@
it considers the query to extent to the end of the event.
2. For 'db' (current db) the trailing zero is redundant since the length
is already known.
-3. db_len = 0 means that this is the current db.
+3. In tables_info, db_len = 0 means that this is the current db.
When reading Query events from binary log, we can recognize its format
by its post-header length: in extended case the post-header includes 4
@@ -75,6 +75,77 @@
+ #define Q_QUERY_LEN_OFFSET Q_STATUS_VARS_LEN_OFFSET + 2
+ #define Q_QUERY_TABLES_INFO_LEN_OFFSET Q_QUERY_LEN_OFFSET + 2
+
+***********************************************************************
+HELP NEEDED
+***********************************************************************
+The QUERY_HEADER_LEN is used in the definition of MAX_LOG_EVENT_HEADER:
+
+log_event.h
+~~~~~~~~~~~
+#define MAX_LOG_EVENT_HEADER ( /* in order of Query_log_event::write */ \
+ LOG_EVENT_HEADER_LEN + /* write_header */ \
+ QUERY_HEADER_LEN + /* write_data */ \
+ EXECUTE_LOAD_QUERY_EXTRA_HEADER_LEN + /*write_post_header_for_derived */ \
+ MAX_SIZE_LOG_EVENT_STATUS + /* status */ \
+ NAME_LEN + 1)
+
+which is used only for setting
+
+ thd->variables.max_allowed_packet
+ mysql->net.max_packet_size
+
+Looks like (but I am not quite sure) that QUERY_HEADER_LEN can simply
+(without making any other changes) be substituted in this definition by
+QUERY_HEADER_LEN_EXT.
+
+Below I list all places where MAX_LOG_EVENT_HEADER is used:
+
+slave.cc
+~~~~~~~~
+static int init_slave_thread(...)
+{ ...
+ /*
+ Adding MAX_LOG_EVENT_HEADER_LEN to the max_allowed_packet on all
+ slave threads, since a replication event can become this much larger
+ than the corresponding packet (query) sent from client to master.
+ */
+ thd->variables.max_allowed_packet= global_system_variables.max_allowed_packet
+ + MAX_LOG_EVENT_HEADER; /* note, incr over the global not session var */
+ ...
+}
+pthread_handler_t handle_slave_io(...)
+{ ...
+ /*
+ Adding MAX_LOG_EVENT_HEADER_LEN to the max_packet_size on the I/O
+ thread, since a replication event can become this much larger than
+ the corresponding packet (query) sent from client to master.
+ */
+ mysql->net.max_packet_size= thd->net.max_packet_size+= MAX_LOG_EVENT_HEADER;
+ ...
+}
+
+sql_repl.cc
+~~~~~~~~~~~
+void mysql_binlog_send(...)
+{ ...
+ /*
+ Adding MAX_LOG_EVENT_HEADER_LEN, since a binlog event can become
+ this larger than the corresponding packet (query) sent
+ from client to master.
+ */
+ thd->variables.max_allowed_packet+= MAX_LOG_EVENT_HEADER;
+ ...
+}
+bool mysql_show_binlog_events(...)
+{ ...
+ /*
+ to account binlog event header size
+ */
+ thd->variables.max_allowed_packet+= MAX_LOG_EVENT_HEADER;
+ ...
+}
+
3. Changes in log events
************************
@@ -84,7 +155,7 @@
This setting is done in Format description event constructor which creates
the event for writing to binary log:
- if (binlog_with_tables_info)
+ if (opt_binlog_with_tables_info)
post_header_len[QUERY_EVENT - 1] = QUERY_HEADER_LEN_EXT;
else
post_header_len[QUERY_EVENT - 1] = QUERY_HEADER_LEN;
@@ -99,12 +170,12 @@
following manner:
switch (binlog_ver) {
- case 4: /* MySQL 5.0 and higher */
+ #ifndef MYSQL_CLIENT
+ case 4: /* MySQL 5.0 and higher */
...
-+ #else
-+ <error>
+ break;
+ #endif
+
case 1:
case 3:
...
@@ -132,7 +203,7 @@
--------------------------------
[Creates the event for binlogging]
-In case of binlog_with_tables_info = TRUE, set additionally query_len,
+In case of opt_binlog_with_tables_info = TRUE, set additionally query_len,
tables_info_len, and tables_info members (the constructor is to have
an additional 'tables_info' argument).
@@ -140,7 +211,7 @@
----------------
[Writes the event to binlog]
-In case of binlog_with_tables_info = TRUE, write additional members
+In case of opt_binlog_with_tables_info = TRUE, write additional members
(query_len, tables_info_len, and tables_info) to binary log. Also
write corresponding whole event length to the common-header.
-=-=(Alexi - Sun, 08 Nov 2009, 10:40)=-=-
Low Level Design modified.
--- /tmp/wklog.40.old.5055 2009-11-08 08:40:02.000000000 +0000
+++ /tmp/wklog.40.new.5055 2009-11-08 08:40:02.000000000 +0000
@@ -3,6 +3,7 @@
1. Adding --binlog-with-tables-info option
******************************************
+GLOBAL, read-only option.
When set, Query events are to be written in the extended binary
format which contains tables_info. When not set, Query events
-=-=(Alexi - Thu, 05 Nov 2009, 12:37)=-=-
Low Level Design modified.
--- /tmp/wklog.40.old.11441 2009-11-05 12:37:16.000000000 +0200
+++ /tmp/wklog.40.new.11441 2009-11-05 12:37:16.000000000 +0200
@@ -1,9 +1,18 @@
OPTION: 2.5 Extend Query Events With Tables Info
================================================
-1. Query_log_event Binary Format
-********************************
-Changes to be done:
+1. Adding --binlog-with-tables-info option
+******************************************
+
+When set, Query events are to be written in the extended binary
+format which contains tables_info. When not set, Query events
+are to be written in usual format (without any changes).
+
+2. Query event extended binary format
+*************************************
+
+When --binlog-with-tables-info is set, Query events are writen
+to binary log in the following (extended) format.
Query_log_event binary format
---------------------------------
@@ -24,12 +33,12 @@
error_code 2
status_vars_len 2
+ query_len 2 (see Note 1)
-+ tables_info_len 2 (see Note 2)
++ tables_info_len 2
---------------------------------
BODY:
status_vars status_vars_len
- db db_len + 1
-+ db db_len (see Note 3)
++ db db_len (see Note 2)
query query_len
+ tables_info
@@ -37,7 +46,7 @@
---------------------------------
Name Size (bytes)
---------------------------------
- db_len 1 (see Note 4)
+ db_len 1 (see Note 3)
db db_len
table_name_len 1
table_name table_name_len
@@ -48,19 +57,99 @@
table_name table_name_len
NOTES
-1. Currently Query_log_event format doesn't include 'query_len' because
+1. In usual format, Query_log_event 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. For 'db' (current db) the trailing zero is redundant since the length
+ is already known.
+3. db_len = 0 means that this is the current db.
+
+When reading Query events from binary log, we can recognize its format
+by its post-header length: in extended case the post-header includes 4
+additional bytes.
+
+ #define QUERY_HEADER_LEN (QUERY_HEADER_MINIMAL_LEN + 4)
++ #define QUERY_HEADER_LEN_EXT (QUERY_HEADER_LEN + 4)
+ ...
+ #define Q_STATUS_VARS_LEN_OFFSET 11
++ #define Q_QUERY_LEN_OFFSET Q_STATUS_VARS_LEN_OFFSET + 2
++ #define Q_QUERY_TABLES_INFO_LEN_OFFSET Q_QUERY_LEN_OFFSET + 2
+
+3. Changes in log events
+************************
+
+3.1. Format description event
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Changes needed here concern setting post-header length for Query events.
+This setting is done in Format description event constructor which creates
+the event for writing to binary log:
+
+ if (binlog_with_tables_info)
+ post_header_len[QUERY_EVENT - 1] = QUERY_HEADER_LEN_EXT;
+ else
+ post_header_len[QUERY_EVENT - 1] = QUERY_HEADER_LEN;
+
+This change is to be done only for case binlog_ver = 4.
+
+NOTE. The refered above constructor is allowed to be invoked in a client
+context for creating "artificial" Format description events in case of
+MySQL < 5.0 (e.g. see mysqlbinlog code). To avoid compilation problems
+(because of 'binlog_with_tables_info') and taking into account the
+"MySQL < 5.0" restriction, we have to #ifdef out the above code in
+following manner:
+
+ switch (binlog_ver) {
+ case 4: /* MySQL 5.0 and higher */
++ #ifndef MYSQL_CLIENT
+ ...
++ #else
++ <error>
++ #endif
+ case 1:
+ case 3:
+ ...
+ }
+
+3.2. Query event
+~~~~~~~~~~~~~~~~
+Changes needed here include adding tables_info and tables_info_len
+members (member for query length already exists) and modifying the
+following function-members:
+
+Query_log_event(buf) constructor
+--------------------------------
+[Parses binary format written to the 'buf']
+
+Getting post-header length from the Format description event (passed
+to the constructor as an argument), define whether buf contains an
+extended or usual Query event and parse the buf contents accordingly.
+
+NOTE. Defining Query event format here should be done with taking into
+account that this constructor can be called within a Query-derived
+event with the event_type argument != QUERY_EVENT.
+
+Query_log_event(thd) constructor
+--------------------------------
+[Creates the event for binlogging]
+
+In case of binlog_with_tables_info = TRUE, set additionally query_len,
+tables_info_len, and tables_info members (the constructor is to have
+an additional 'tables_info' argument).
+
+write() function
+----------------
+[Writes the event to binlog]
+
+In case of binlog_with_tables_info = TRUE, write additional members
+(query_len, tables_info_len, and tables_info) to binary log. Also
+write corresponding whole event length to the common-header.
+
+<To be continued>
-2. Where to get tables info from?
+4. Where to get tables info from?
*********************************
-2.1. Case study: CREATE TABLE
-******************************
+4.1. Case study: CREATE TABLE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*** CREATE TABLE table [SELECT ...]
@@ -129,4 +218,4 @@
}
}
-To be continued
+<To be continued>
-=-=(Alexi - Wed, 04 Nov 2009, 10:21)=-=-
Low Level Design modified.
--- /tmp/wklog.40.old.6734 2009-11-04 10:21:20.000000000 +0200
+++ /tmp/wklog.40.new.6734 2009-11-04 10:21:20.000000000 +0200
@@ -21,9 +21,9 @@
slave_proxy_id 4
exec_time 4
db_len 1
-+ query_len 2 (see Note 1)
error_code 2
status_vars_len 2
++ query_len 2 (see Note 1)
+ tables_info_len 2 (see Note 2)
---------------------------------
BODY:
-=-=(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
------------------------------------------------------------
-=-=(View All Progress Notes, 12 total)=-=-
http://askmonty.org/worklog/index.pl?tid=40&nolimit=1
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. Adding --binlog-with-tables-info option
******************************************
GLOBAL, read-only option.
When set, Query events are to be written in the extended binary
format which contains tables_info. When not set, Query events
are to be written in usual format (without any changes).
2. Query event extended binary format
*************************************
When --binlog-with-tables-info is set, Query events are writen
to binary log in the following (extended) format.
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
error_code 2
status_vars_len 2
+ query_len 2 (see Note 1)
+ tables_info_len 2
---------------------------------
BODY:
status_vars status_vars_len
- db db_len + 1
+ db db_len (see Note 2)
query query_len
+ tables_info
tables_info binary format
---------------------------------
Name Size (bytes)
---------------------------------
db_len 1 (see Note 3)
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. In usual format, Query_log_event doesn't include 'query_len' because
it considers the query to extent to the end of the event.
2. For 'db' (current db) the trailing zero is redundant since the length
is already known.
3. In tables_info, db_len = 0 means that this is the current db.
When reading Query events from binary log, we can recognize its format
by its post-header length: in extended case the post-header includes 4
additional bytes.
#define QUERY_HEADER_LEN (QUERY_HEADER_MINIMAL_LEN + 4)
+ #define QUERY_HEADER_LEN_EXT (QUERY_HEADER_LEN + 4)
...
#define Q_STATUS_VARS_LEN_OFFSET 11
+ #define Q_QUERY_LEN_OFFSET Q_STATUS_VARS_LEN_OFFSET + 2
+ #define Q_QUERY_TABLES_INFO_LEN_OFFSET Q_QUERY_LEN_OFFSET + 2
***********************************************************************
HELP NEEDED
***********************************************************************
The QUERY_HEADER_LEN is used in the definition of MAX_LOG_EVENT_HEADER:
log_event.h
~~~~~~~~~~~
#define MAX_LOG_EVENT_HEADER ( /* in order of Query_log_event::write */ \
LOG_EVENT_HEADER_LEN + /* write_header */ \
QUERY_HEADER_LEN + /* write_data */ \
EXECUTE_LOAD_QUERY_EXTRA_HEADER_LEN + /*write_post_header_for_derived */ \
MAX_SIZE_LOG_EVENT_STATUS + /* status */ \
NAME_LEN + 1)
which is used only for setting
thd->variables.max_allowed_packet
mysql->net.max_packet_size
Looks like (but I am not quite sure) that QUERY_HEADER_LEN can simply
(without making any other changes) be substituted in this definition by
QUERY_HEADER_LEN_EXT.
Below I list all places where MAX_LOG_EVENT_HEADER is used:
slave.cc
~~~~~~~~
static int init_slave_thread(...)
{ ...
/*
Adding MAX_LOG_EVENT_HEADER_LEN to the max_allowed_packet on all
slave threads, since a replication event can become this much larger
than the corresponding packet (query) sent from client to master.
*/
thd->variables.max_allowed_packet= global_system_variables.max_allowed_packet
+ MAX_LOG_EVENT_HEADER; /* note, incr over the global not session var */
...
}
pthread_handler_t handle_slave_io(...)
{ ...
/*
Adding MAX_LOG_EVENT_HEADER_LEN to the max_packet_size on the I/O
thread, since a replication event can become this much larger than
the corresponding packet (query) sent from client to master.
*/
mysql->net.max_packet_size= thd->net.max_packet_size+= MAX_LOG_EVENT_HEADER;
...
}
sql_repl.cc
~~~~~~~~~~~
void mysql_binlog_send(...)
{ ...
/*
Adding MAX_LOG_EVENT_HEADER_LEN, since a binlog event can become
this larger than the corresponding packet (query) sent
from client to master.
*/
thd->variables.max_allowed_packet+= MAX_LOG_EVENT_HEADER;
...
}
bool mysql_show_binlog_events(...)
{ ...
/*
to account binlog event header size
*/
thd->variables.max_allowed_packet+= MAX_LOG_EVENT_HEADER;
...
}
3. Changes in log events
************************
3.1. Format description event
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Changes needed here concern setting post-header length for Query events.
This setting is done in Format description event constructor which creates
the event for writing to binary log:
if (opt_binlog_with_tables_info)
post_header_len[QUERY_EVENT - 1] = QUERY_HEADER_LEN_EXT;
else
post_header_len[QUERY_EVENT - 1] = QUERY_HEADER_LEN;
This change is to be done only for case binlog_ver = 4.
NOTE. The refered above constructor is allowed to be invoked in a client
context for creating "artificial" Format description events in case of
MySQL < 5.0 (e.g. see mysqlbinlog code). To avoid compilation problems
(because of 'binlog_with_tables_info') and taking into account the
"MySQL < 5.0" restriction, we have to #ifdef out the above code in
following manner:
switch (binlog_ver) {
+ #ifndef MYSQL_CLIENT
case 4: /* MySQL 5.0 and higher */
...
break;
+ #endif
case 1:
case 3:
...
}
3.2. Query event
~~~~~~~~~~~~~~~~
Changes needed here include adding tables_info and tables_info_len
members (member for query length already exists) and modifying the
following function-members:
Query_log_event(buf) constructor
--------------------------------
[Parses binary format written to the 'buf']
Getting post-header length from the Format description event (passed
to the constructor as an argument), define whether buf contains an
extended or usual Query event and parse the buf contents accordingly.
NOTE. Defining Query event format here should be done with taking into
account that this constructor can be called within a Query-derived
event with the event_type argument != QUERY_EVENT.
Query_log_event(thd) constructor
--------------------------------
[Creates the event for binlogging]
In case of opt_binlog_with_tables_info = TRUE, set additionally query_len,
tables_info_len, and tables_info members (the constructor is to have
an additional 'tables_info' argument).
write() function
----------------
[Writes the event to binlog]
In case of opt_binlog_with_tables_info = TRUE, write additional members
(query_len, tables_info_len, and tables_info) to binary log. Also
write corresponding whole event length to the common-header.
<To be continued>
4. Where to get tables info from?
*********************************
4.1. 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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