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MXS-1905 Switchover if master is low on disk space

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Required quite a bit of refactoring.
This commit is contained in:
Esa Korhonen
2018-08-01 10:39:30 +03:00
parent 84b3e4672f
commit c0bd5ca3a1
8 changed files with 577 additions and 255 deletions
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15
server/modules/monitor/mariadbmon/mariadbmon.hh
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@ -25,6 +25,7 @@
#include "mariadbserver.hh"
extern const char * const CN_AUTO_FAILOVER;
extern const char * const CN_SWITCHOVER_ON_LOW_DISK_SPACE;
extern const char * const CN_PROMOTION_SQL_FILE;
extern const char * const CN_DEMOTION_SQL_FILE;
@ -177,6 +178,7 @@ private:
bool m_warn_no_valid_outside_cycle; /**< Log a warning when a replication topology has no valid master
* outside of a cycle. */
bool m_warn_failover_precond; /**< Print failover preconditions error message? */
bool m_warn_switchover_precond; /**< Print switchover preconditions error message? */
bool m_warn_cannot_rejoin; /**< Print warning if auto_rejoin fails because of invalid gtid:s? */
bool m_warn_current_master_invalid; /**< Print warning if current master is not valid? */
bool m_warn_have_better_master; /**< Print warning if the current master is not the best one? */
@ -190,6 +192,7 @@ private:
bool set_replication_credentials(const MXS_CONFIG_PARAMETER* params);
MariaDBServer* get_server_info(MXS_MONITORED_SERVER* db);
MariaDBServer* get_server(int64_t id);
MariaDBServer* get_server(SERVER* server);
bool execute_manual_command(GenericFunction command, json_t** error_out);
std::string diagnostics_to_string() const;
json_t* diagnostics_to_json() const;
@ -218,21 +221,21 @@ private:
void update_master_cycle_info();
void set_low_disk_slaves_maintenance();
void assign_new_master(MariaDBServer* new_master);
bool slaves_using_gtid(json_t** error_out);
// Switchover methods
bool manual_switchover(SERVER* new_master, SERVER* current_master, json_t** error_out);
bool switchover_check(SERVER* new_master, SERVER* current_master,
bool switchover_prepare(SERVER* new_master, SERVER* current_master,
MariaDBServer** new_master_out, MariaDBServer** current_master_out,
json_t** error_out);
bool switchover_check_new(const MariaDBServer* new_master_cand, json_t** error);
bool switchover_check_current(const MariaDBServer* suggested_curr_master, json_t** error_out) const;
bool do_switchover(MariaDBServer** current_master, MariaDBServer** new_master, json_t** err_out);
bool do_switchover(MariaDBServer* demotion_target, MariaDBServer* promotion_target, json_t** error_out);
bool switchover_check_preferred_master(MariaDBServer* preferred, json_t** err_out);
bool switchover_demote_master(MariaDBServer* current_master,
json_t** err_out);
bool switchover_wait_slaves_catchup(const ServerArray& slaves, const GtidList& gtid, int total_timeout,
json_t** err_out);
bool switchover_start_slave(MariaDBServer* old_master, MariaDBServer* new_master);
void handle_low_disk_space_master();
// Failover methods
bool manual_failover(json_t** output);
@ -252,8 +255,9 @@ private:
// Methods common to failover/switchover/rejoin
MariaDBServer* select_new_master(ServerArray* slaves_out, json_t** err_out);
MariaDBServer* switchover_select_promotion(MariaDBServer* current_master, json_t** err_out);
bool server_is_excluded(const MariaDBServer* server);
bool is_candidate_better(const MariaDBServer* current_best, const MariaDBServer* candidate,
bool is_candidate_better(const MariaDBServer* candidate, const MariaDBServer* current_best,
uint32_t gtid_domain, std::string* reason_out = NULL);
bool promote_new_master(MariaDBServer* new_master, json_t** err_out);
int redirect_slaves(MariaDBServer* new_master, const ServerArray& slaves,
@ -262,6 +266,7 @@ private:
bool start_external_replication(MariaDBServer* new_master, json_t** err_out);
bool wait_cluster_stabilization(MariaDBServer* new_master, const ServerArray& slaves,
int seconds_remaining);
void report_and_disable(const std::string& operation, const std::string& setting_name, bool* setting_var);
// Other methods
void disable_setting(const std::string& setting);