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MDEV-162 Enhanced semisync replication

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Implement --semi-sync-master-wait-point=AFTER_SYNC|AFTER_COMMIT.

When AFTER_SYNC, the semi-sync wait will be done earlier, before the storage
engine commit rather than after. This means that a transaction will not be
visible on the master until at least one slave has received it.
This commit is contained in:
Jonas Oreland
2014-12-23 13:38:00 +01:00
committed by Kristian Nielsen
parent 4d8b346e07
commit 0b87de124d
29 changed files with 1735 additions and 46 deletions
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33
sql/replication.h
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@ -81,6 +81,7 @@ typedef struct Trans_observer {
succeeded.
@note The return value is currently ignored by the server.
@note This hook is called wo/ any global mutex held
@param param The parameter for transaction observers
@ -103,6 +104,8 @@ typedef struct Trans_observer {
@param param The parameter for transaction observers
@note This hook is called wo/ any global mutex held
@retval 0 Sucess
@retval 1 Failure
*/
@ -114,7 +117,13 @@ typedef struct Trans_observer {
*/
enum Binlog_storage_flags {
/** Binary log was sync:ed */
BINLOG_STORAGE_IS_SYNCED = 1
BINLOG_STORAGE_IS_SYNCED = 1,
/** First(or alone) in a group commit */
BINLOG_GROUP_COMMIT_LEADER = 2,
/** Last(or alone) in a group commit */
BINLOG_GROUP_COMMIT_TRAILER = 4
};
/**
@ -137,6 +146,8 @@ typedef struct Binlog_storage_observer {
binary log file. Whether the binary log file is synchronized to
disk is indicated by the bit BINLOG_STORAGE_IS_SYNCED in @a flags.
@note: this hook is called with LOCK_log mutex held
@param param Observer common parameter
@param log_file Binlog file name been updated
@param log_pos Binlog position after update
@ -148,6 +159,26 @@ typedef struct Binlog_storage_observer {
int (*after_flush)(Binlog_storage_param *param,
const char *log_file, my_off_t log_pos,
uint32 flags);
/**
This callback is called after binlog has been synced
This callback is called after events flushed to disk has been sync:ed
("group committed").
@note: this hook is called with LOCK_after_binlog_sync mutex held
@param param Observer common parameter
@param log_file Binlog file name been updated
@param log_pos Binlog position after update
@param flags flags for binlog storage
@retval 0 Sucess
@retval 1 Failure
*/
int (*after_sync)(Binlog_storage_param *param,
const char *log_file, my_off_t log_pos,
uint32 flags);
} Binlog_storage_observer;
/**