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#ifndef RPL_PARALLEL_H
#define RPL_PARALLEL_H
#include "log_event.h"
struct rpl_parallel;
struct rpl_parallel_entry;
struct rpl_parallel_thread_pool;
class Relay_log_info;
struct rpl_parallel_thread {
bool delay_start;
bool running;
bool stop;
mysql_mutex_t LOCK_rpl_thread;
mysql_cond_t COND_rpl_thread;
struct rpl_parallel_thread *next; /* For free list. */
struct rpl_parallel_thread_pool *pool;
THD *thd;
struct rpl_parallel_entry *current_entry;
struct queued_event {
queued_event *next;
Log_event *ev;
rpl_group_info *rgi;
ulonglong future_event_relay_log_pos;
char event_relay_log_name[FN_REFLEN];
char future_event_master_log_name[FN_REFLEN];
ulonglong event_relay_log_pos;
my_off_t future_event_master_log_pos;
size_t event_size;
} *event_queue, *last_in_queue;
uint64 queued_size;
void enqueue(queued_event *qev)
{
if (last_in_queue)
last_in_queue->next= qev;
else
event_queue= qev;
last_in_queue= qev;
queued_size+= qev->event_size;
}
void dequeue(queued_event *list)
{
queued_event *tmp;
DBUG_ASSERT(list == event_queue);
event_queue= last_in_queue= NULL;
for (tmp= list; tmp; tmp= tmp->next)
queued_size-= tmp->event_size;
}
};
struct rpl_parallel_thread_pool {
uint32 count;
struct rpl_parallel_thread **threads;
struct rpl_parallel_thread *free_list;
mysql_mutex_t LOCK_rpl_thread_pool;
mysql_cond_t COND_rpl_thread_pool;
bool changing;
bool inited;
rpl_parallel_thread_pool();
int init(uint32 size);
void destroy();
struct rpl_parallel_thread *get_thread(rpl_parallel_entry *entry);
};
struct rpl_parallel_entry {
uint32 domain_id;
uint32 last_server_id;
uint64 last_seq_no;
uint64 last_commit_id;
bool active;
/*
Set when SQL thread is shutting down, and no more events can be processed,
so worker threads must force abort any current transactions without
waiting for event groups to complete.
*/
bool force_abort;
rpl_parallel_thread *rpl_thread;
/*
The sub_id of the last transaction to commit within this domain_id.
Must be accessed under LOCK_parallel_entry protection.
*/
uint64 last_committed_sub_id;
mysql_mutex_t LOCK_parallel_entry;
mysql_cond_t COND_parallel_entry;
/*
The sub_id of the last event group in this replication domain that was
queued for execution by a worker thread.
*/
uint64 current_sub_id;
rpl_group_info *current_group_info;
/*
The sub_id of the last event group in the previous batch of group-committed
transactions.
When we spawn parallel worker threads for the next group-committed batch,
they first need to wait for this sub_id to be committed before it is safe
to start executing them.
*/
uint64 prev_groupcommit_sub_id;
};
struct rpl_parallel {
HASH domain_hash;
rpl_parallel_entry *current;
bool sql_thread_stopping;
rpl_parallel();
~rpl_parallel();
void reset();
rpl_parallel_entry *find(uint32 domain_id);
void wait_for_done();
bool do_event(rpl_group_info *serial_rgi, Log_event *ev,
ulonglong event_size);
};
extern struct rpl_parallel_thread_pool global_rpl_thread_pool;
extern int rpl_parallel_change_thread_count(rpl_parallel_thread_pool *pool,
uint32 new_count,
bool skip_check= false);
#endif /* RPL_PARALLEL_H */
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