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MDEV-7145: Delayed replication

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Merge feature into 10.2 from feature branch.

Delayed replication adds an option

  CHANGE MASTER TO master_delay=<seconds>

Replication will then delay applying events with that many
seconds. This creates a replication slave that reflects the state of
the master some time in the past.

Feature is ported from MySQL source tree.

Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>
This commit is contained in:
Kristian Nielsen
2016-10-16 23:44:44 +02:00
parent 057c560ee4 fb13616518
commit e1ef99c3dc
31 changed files with 1677 additions and 321 deletions
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8
sql/sql_repl.cc
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@ -495,7 +495,7 @@ static enum enum_binlog_checksum_alg get_binlog_checksum_value_at_connect(THD *
TODO
- Inform the slave threads that they should sync the position
in the binary log file with flush_relay_log_info.
in the binary log file with Relay_log_info::flush().
Now they sync is done for next read.
*/
@ -3304,6 +3304,7 @@ int reset_slave(THD *thd, Master_info* mi)
mi->clear_error();
mi->rli.clear_error();
mi->rli.clear_until_condition();
mi->rli.clear_sql_delay();
mi->rli.slave_skip_counter= 0;
// close master_info_file, relay_log_info_file, set mi->inited=rli->inited=0
@ -3613,6 +3614,9 @@ bool change_master(THD* thd, Master_info* mi, bool *master_info_added)
if (lex_mi->ssl != LEX_MASTER_INFO::LEX_MI_UNCHANGED)
mi->ssl= (lex_mi->ssl == LEX_MASTER_INFO::LEX_MI_ENABLE);
if (lex_mi->sql_delay != -1)
mi->rli.set_sql_delay(lex_mi->sql_delay);
if (lex_mi->ssl_verify_server_cert != LEX_MASTER_INFO::LEX_MI_UNCHANGED)
mi->ssl_verify_server_cert=
(lex_mi->ssl_verify_server_cert == LEX_MASTER_INFO::LEX_MI_ENABLE);
@ -3797,7 +3801,7 @@ bool change_master(THD* thd, Master_info* mi, bool *master_info_added)
in-memory value at restart (thus causing errors, as the old relay log does
not exist anymore).
*/
flush_relay_log_info(&mi->rli);
mi->rli.flush();
mysql_cond_broadcast(&mi->data_cond);
mysql_mutex_unlock(&mi->rli.data_lock);