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MXS-1845 Assign server roles

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Assign server roles (master, slave, relay master, slave of external master)
for a graph with possibly multiple paths to a slave server.
This commit is contained in:
Esa Korhonen
2018-06-08 11:02:53 +03:00
parent 3f82c25c62
commit 5324a1bdaa
6 changed files with 206 additions and 24 deletions
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46
server/modules/monitor/mariadbmon/mariadbmon.cc
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@ -105,6 +105,14 @@ void MariaDBMonitor::clear_server_info()
m_external_master_port = PORT_UNKNOWN;
}
void MariaDBMonitor::reset_node_index_info()
{
for (auto iter = m_servers.begin(); iter != m_servers.end(); iter++)
{
(*iter)->m_node.reset_indexes();
}
}
/**
* Get monitor-specific server info for the monitored server.
*
@ -382,8 +390,40 @@ void MariaDBMonitor::tick()
}
}
build_replication_graph();
find_graph_cycles();
// Use the information to find the so far best master server.
MariaDBServer* root_master = find_root_master();
MariaDBServer* root_master = find_topology_master_server();
if (root_master)
{
MXS_DEBUG("Server '%s' is the best master candidate with %d slaves.",
root_master->name(), root_master->m_node.reach);
m_master = root_master;
}
#ifdef SS_DEBUG
else
{
MXS_DEBUG("No valid master server found in the cluster.");
}
#endif
assign_master_and_slave();
if (!m_ignore_external_masters)
{
// Do a sweep through all the nodes in the cluster (even the master) and mark other states.
for (auto iter = m_servers.begin(); iter != m_servers.end(); iter++)
{
MariaDBServer* server = *iter;
if (!server->m_node.external_masters.empty())
{
server->set_status(SERVER_SLAVE_OF_EXT_MASTER);
}
else
{
server->clear_status(SERVER_SLAVE_OF_EXT_MASTER);
}
}
}
if (m_master != NULL && m_master->is_master())
{
@ -392,11 +432,9 @@ void MariaDBMonitor::tick()
update_external_master();
}
// Assign relay masters, clear SERVER_SLAVE from binlog relays
// Clear SERVER_SLAVE from binlog relays
for (auto iter = m_servers.begin(); iter != m_servers.end(); iter++)
{
assign_relay_master(**iter);
/* Remove SLAVE status if this server is a Binlog Server relay */
if ((*iter)->m_version == MariaDBServer::version::BINLOG_ROUTER)
{