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MXS-1722 Add better error messages to switchover_demote_master()

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The error messages should now be a bit more reliable.
This commit is contained in:
Esa Korhonen 2018-03-21 10:31:24 +02:00
parent 0e3874781f
commit bd8b6dbc6f
1 changed files with 20 additions and 7 deletions
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27
server/modules/monitor/mariadbmon/mariadbmon.cc
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@ -4052,7 +4052,7 @@ static bool switchover_demote_master(MYSQL_MONITOR* mon,
bool success = false;
bool query_error = false;
MYSQL* conn = current_master->con;
const char* query = "";
const char* query = ""; // The next query to execute. Used also for error printing.
// The presence of an external master changes several things.
const bool external_master = SERVER_IS_SLAVE_OF_EXTERNAL_MASTER(current_master->server);
@ -4068,6 +4068,7 @@ static bool switchover_demote_master(MYSQL_MONITOR* mon,
}
}
bool error_fetched = false;
string error_desc;
if (!query_error)
{
@ -4101,27 +4102,39 @@ static bool switchover_demote_master(MYSQL_MONITOR* mon,
{
// Somehow, a step after "SET read_only" failed. Try to set read_only back to 0. It may not
// work since the connection is likely broken.
error_desc = mysql_error(conn);
error_desc = mysql_error(conn); // Read connection error before next step.
error_fetched = true;
mxs_mysql_query(conn, "SET GLOBAL read_only=0;");
}
}
}
if (query_error)
if (query_error && !error_fetched)
{
error_desc = mysql_error(conn);
}
if (!success)
{
if (error_desc.empty())
if (query_error)
{
PRINT_MXS_JSON_ERROR(err_out, "Demotion failed due to an error in updating gtid:s.");
if (error_desc.empty())
{
const char UNKNOWN_ERROR[] = "Demotion failed due to an unknown error when executing "
"a query. Query: '%s'.";
PRINT_MXS_JSON_ERROR(err_out, UNKNOWN_ERROR, query);
}
else
{
const char KNOWN_ERROR[] = "Demotion failed due to a query error: '%s'. Query: '%s'.";
PRINT_MXS_JSON_ERROR(err_out, KNOWN_ERROR, error_desc.c_str(), query);
}
}
else
{
PRINT_MXS_JSON_ERROR(err_out, "Demotion failed due to a query error: '%s'. Query: '%s'.",
error_desc.c_str(), query);
const char GTID_ERROR[] = "Demotion failed due to an error in updating gtid:s. "
"Check log for more details.";
PRINT_MXS_JSON_ERROR(err_out, GTID_ERROR);
}
}
return success;