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71 lines
2.8 KiB
SQL
71 lines
2.8 KiB
SQL
# For a given event which is at position $master_log_pos in the the master's
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# binary log, returns its position in the slave's relay log file
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# $relay_log_file.
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# The position is stored in the variable $relay_log_pos.
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# Usage:
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# let $relay_log_file= 'relay-log-bin.000001';
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# let $master_log_pos= 106;
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# source include/get_relay_log_pos.inc;
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# # at this point, get_relay_log_pos.inc sets $relay_log_pos. echo position
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# # in $relay_log_file: $relay_log_pos.
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if (!$relay_log_file)
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{
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--die 'variable $relay_log_file is null'
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}
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if (!$master_log_pos)
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{
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--die 'variable $master_log_pos is null'
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}
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let $MYSQLD_DATADIR= `select @@datadir`;
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let $_suffix= `SELECT UUID()`;
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let $_tmp_file= $MYSQLTEST_VARDIR/tmp/mysqlbinlog.$_suffix;
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--exec $MYSQL_BINLOG $MYSQLD_DATADIR/$relay_log_file > $_tmp_file
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# All queries in this file should not be logged.
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--disable_query_log
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--disable_warnings
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DROP TEMPORARY TABLE IF EXISTS mysqlbinlog_events;
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DROP TEMPORARY TABLE IF EXISTS events_at;
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DROP TEMPORARY TABLE IF EXISTS events_pos;
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CREATE TEMPORARY TABLE mysqlbinlog_events(c1 INT AUTO_INCREMENT KEY, c2 varchar(256));
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# Event position is in the comments output by mysqlbinlog, we load this
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# comments into the table
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# '# at 106'
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# '# .... end_log_pos 46'
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eval LOAD DATA LOCAL INFILE '$_tmp_file' INTO TABLE mysqlbinlog_events
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LINES STARTING BY '#' (c2) SET c1 = NULL;
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--enable_warnings
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# Event pos in relay log file is inserted into table events_at
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CREATE TEMPORARY TABLE events_at(c1 INT AUTO_INCREMENT KEY, c2 varchar(256))
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SELECT c2 FROM mysqlbinlog_events WHERE c2 LIKE ' at%' ORDER BY c1;
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# Event pos in master log file is inserted into table events_pos
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CREATE TEMPORARY TABLE events_pos(c1 INT AUTO_INCREMENT KEY, c2 varchar(256))
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SELECT c2 FROM mysqlbinlog_events WHERE c2 LIKE '% end_log_pos %' ORDER BY c1;
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# events_at events_pos
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# c1------c2-------------------------- c1------c2------------------------
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# 1 ev1's begin pos in relay log 1 ev1's end pos in master log
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# 2 ev2's begin pos in relay log 2 ev2's end pos in master log
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# 3 ev3's begin pos in relay log 3 ev3's end pos in master log
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# events always keep the same sequence.
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# Because event[N]'s end pos is equal to event[N+1]'s begin pos we want to
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# find event's end pos in relay log, we can find the right relay_log_pos
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# using the relationship that 'events_pos.c1 = events_at.c1 + 1'
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#
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# There is a fault that we can't get the relay log position of the last event,
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# as it is not output by mysqlbinlog
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let $relay_log_pos= `SELECT SUBSTRING(a.c2, 5)
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FROM events_at a, events_pos b
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WHERE a.c1=b.c1+1 and b.c2 LIKE '% $master_log_pos%'`;
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DROP TEMPORARY TABLE mysqlbinlog_events, events_at, events_pos;
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--remove_file $_tmp_file
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--enable_query_log
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