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MXS-2158 Return true if update_gtids() succeeds, even if no data is returned

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Previously, if the server had no gtid:s, the method would fail leading to
a confusing error message. This could even totally stop the monitor from working
if a recent server version (10.X) did not have any gtid events.
This commit is contained in:
Esa Korhonen 2018-11-12 12:36:30 +02:00
parent f03c5e0fef
commit 14e38e4e08
2 changed files with 27 additions and 20 deletions
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45
server/modules/monitor/mariadbmon/mariadbserver.cc
View File

@ -376,32 +376,39 @@ bool MariaDBServer::update_gtids(string* errmsg_out)
bool rval = false;
auto result = execute_query(query, errmsg_out);
if (result.get() != NULL && result->next_row())
if (result.get() != NULL)
{
auto current_str = result->get_string(i_current_pos);
auto binlog_str = result->get_string(i_binlog_pos);
bool current_ok = false;
if (current_str.empty())
rval = true;
if (result->next_row())
{
m_gtid_current_pos = GtidList();
// Query returned at least some data.
auto current_str = result->get_string(i_current_pos);
auto binlog_str = result->get_string(i_binlog_pos);
if (current_str.empty())
{
m_gtid_current_pos = GtidList();
}
else
{
m_gtid_current_pos = GtidList::from_string(current_str);
}
if (binlog_str.empty())
{
m_gtid_binlog_pos = GtidList();
}
else
{
m_gtid_binlog_pos = GtidList::from_string(binlog_str);
}
}
else
{
m_gtid_current_pos = GtidList::from_string(current_str);
current_ok = !m_gtid_current_pos.empty();
}
if (binlog_str.empty())
{
// Query succeeded but returned 0 rows. This means that the server has no gtid:s.
m_gtid_current_pos = GtidList();
m_gtid_binlog_pos = GtidList();
}
else
{
m_gtid_binlog_pos = GtidList::from_string(binlog_str);
}
rval = current_ok;
}
} // If query failed, do not update gtid:s.
return rval;
}

2
server/modules/monitor/mariadbmon/mariadbserver.hh
View File

@ -202,7 +202,7 @@ public:
* Query gtid_current_pos and gtid_binlog_pos and save the values to the server.
*
* @param errmsg_out Where to store an error message if query fails. Can be null.
* @return True if successful
* @return True if query succeeded
*/
bool update_gtids(std::string* errmsg_out = NULL);