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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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46
server/modules/monitor/mariadbmon/mariadbserver.hh
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@ -149,7 +149,9 @@ public:
* read-only. */
NodeData m_node; /**< Replication topology data */
SlaveStatusArray m_slave_status; /**< Data returned from SHOW SLAVE STATUS */
ReplicationSettings m_rpl_settings; /**< Miscellaneous replication related settings */
ReplicationSettings m_rpl_settings; /**< Miscellaneous replication related settings. These are not
* normally queried from the server, call
* 'update_replication_settings' before use. */
bool m_print_update_errormsg;/**< Should an update error be printed. */
MariaDBServer(MXS_MONITORED_SERVER* monitored_server, int config_index);
@ -196,9 +198,10 @@ public:
/**
* Query a few miscellaneous replication settings.
*
* @param error_out Query error output
* @return True on success
*/
bool update_replication_settings();
bool update_replication_settings(std::string* error_out = NULL);
/**
* Query and save server_id, read_only and (if 10.X) gtid_domain_id.
@ -214,7 +217,7 @@ public:
* @param print_on Print warnings or not
* @return True if log_bin is on
*/
bool check_replication_settings(print_repl_warnings_t print_warnings = WARNINGS_ON);
bool check_replication_settings(print_repl_warnings_t print_warnings = WARNINGS_ON) const;
/**
* Wait until server catches up to the target gtid. Only considers gtid domains common to this server
@ -228,6 +231,21 @@ public:
*/
bool wait_until_gtid(const GtidList& target, int timeout, json_t** err_out);
/**
* Is the server replicating (or trying to) from the target server.
*
* @param target Immediate master or relay server
* @return True if replicating
*/
bool is_replicating_from(const MariaDBServer* target);
/**
* Is binary log on? 'update_replication_settings' should be ran before this function to query the data.
*
* @return True if server has binary log enabled
*/
bool binlog_on() const;
/**
* Check if server is a running master.
*
@ -273,6 +291,11 @@ public:
*/
bool is_relay_master() const;
/**
* Is the server low on disk space?
*/
bool is_low_on_disk_space() const;
/**
* Check if server has the given bits on in 'pending_status'.
*
@ -370,6 +393,23 @@ public:
*/
bool failover_wait_relay_log(int seconds_remaining, json_t** err_out);
/**
* Is the server a valid demotion target?
*
* @param reason_out Output explaining why server cannot be demoted
* @return True if server can be demoted by switchover
*/
bool can_be_demoted(std::string* reason_out);
/**
* Is the server a valid promotion target?
*
* @param demotion_target Which server would be demoted
* @param reason_out Output explaining why server cannot be promoted
* @return True if server can be promoted by switchover
*/
bool can_be_promoted(const MariaDBServer* demotion_target, std::string* reason_out);
/**
* Read the file contents and send them as sql queries to the server. Any data returned by the queries is
* discarded.