hcq/MaxScale
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

MXS-2169 Allow a downed server to be selected as topology master

Browse Source 
This is required for the case when MaxScale is started when the master is
already down.
This commit is contained in:
Esa Korhonen
2019-05-10 11:23:41 +03:00
parent d2f3e56d0a
commit 4ee30f5c52
6 changed files with 290 additions and 184 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
server/modules/monitor/mariadbmon/mariadbmon.hh
View File

@ -119,6 +119,12 @@ private:
ON
};
enum class RequireRunning
{
REQUIRED,
OPTIONAL
};
class SwitchoverParams
{
public:
@ -239,7 +245,7 @@ private:
// Fields controlling logging of various events. TODO: Check these
bool m_log_no_master = true; /* Should it be logged that there is no master? */
bool m_warn_current_master_invalid = true; /* Print warning if current master is not valid? */
bool m_warn_have_better_master = true; /* Print warning if the current master is not the best one? */
bool m_warn_cannot_find_master = true; /* Print warning if a master cannot be found? */
bool m_warn_master_down = true; /* Print warning that failover may happen soon? */
bool m_warn_failover_precond = true; /* Print failover preconditions error message? */
bool m_warn_switchover_precond = true; /* Print switchover preconditions error message? */
@ -267,6 +273,7 @@ private:
// Cluster discovery and status assignment methods, top levels
void update_topology();
void build_replication_graph();
void update_master();
void assign_new_master(MariaDBServer* new_master);
void find_graph_cycles();
bool master_is_valid(std::string* reason_out);
@ -274,8 +281,7 @@ private:
void assign_slave_and_relay_master(MariaDBServer* start_node);
void check_cluster_operations_support();
MariaDBServer* find_topology_master_server(std::string* msg_out);
MariaDBServer* find_master_inside_cycle(ServerArray& cycle_servers);
MariaDBServer* find_topology_master_server(RequireRunning req_running, std::string* msg_out = nullptr);
MariaDBServer* find_best_reach_server(const ServerArray& candidates);
// Cluster discovery and status assignment methods, low level
@ -286,6 +292,7 @@ private:
void update_gtid_domain();
void update_external_master();
void update_master_cycle_info();
bool is_candidate_valid(MariaDBServer* cand, RequireRunning req_running, std::string* why_not = nullptr);
// Cluster operation launchers
bool manual_switchover(SERVER* new_master, SERVER* current_master, json_t** error_out);