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Backport BUG#47298 Semisync: always wait until timeout if no semi-sync slave available

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Add an option to control whether the master should keep waiting
until timeout when it detected that there is no semi-sync slave
available.

The bool option 'rpl_semi_sync_master_wait_no_slave' is 1 by
defalt, and will keep waiting until timeout. When set to 0, the
master will switch to asynchronous replication immediately when
no semi-sync slave is available.
This commit is contained in:
He Zhenxing
2009-10-12 21:15:32 +08:00
parent 64fc766c93
commit b92ec52915
6 changed files with 49 additions and 20 deletions
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10
plugin/semisync/semisync_master_plugin.cc
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@@ -76,7 +76,7 @@ int repl_semi_binlog_dump_start(Binlog_transmit_param *param,
/*
Let's assume this semi-sync slave has already received all
binlog events before the filename and position it requests.
*/
*/
repl_semisync.reportReplyBinlog(param->server_id, log_file, log_pos);
}
sql_print_information("Start %s binlog_dump to slave (server_id: %d), pos(%s, %lu)",
@@ -176,6 +176,13 @@ static MYSQL_SYSVAR_ULONG(timeout, rpl_semi_sync_master_timeout,
fix_rpl_semi_sync_master_timeout, // update
10000, 0, ~0L, 1);
static MYSQL_SYSVAR_BOOL(wait_no_slave, rpl_semi_sync_master_wait_no_slave,
PLUGIN_VAR_OPCMDARG,
"Wait until timeout when no semi-synchronous replication slave available (enabled by default). ",
NULL, // check
NULL, // update
1);
static MYSQL_SYSVAR_ULONG(trace_level, rpl_semi_sync_master_trace_level,
PLUGIN_VAR_OPCMDARG,
"The tracing level for semi-sync replication.",
@@ -186,6 +193,7 @@ static MYSQL_SYSVAR_ULONG(trace_level, rpl_semi_sync_master_trace_level,
static SYS_VAR* semi_sync_master_system_vars[]= {
MYSQL_SYSVAR(enabled),
MYSQL_SYSVAR(timeout),
MYSQL_SYSVAR(wait_no_slave),
MYSQL_SYSVAR(trace_level),
NULL,
};