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MDEV-7802 Add status binlog_group_commit_reason_*

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The following global status variables where added:
* binlog_group_commit_reason_count
* binlog_group_commit_reason_usec
* binlog_group_commit_reason_transaction
* binlog_group_commit_reason_immediate

binlog_group_commit_reason_count corresponds to group commits made by
virtue of the binlog_commit_wait_count variable.

binlog_group_commit_reason_usec corresponds to the binlog_commit_wait_usec
variable.

binlog_group_commit_reason_transaction is a result of ordered
transaction that need to occur in the same order on the slave and can't
be parallelised.

binlog_group_commit_reason_immediate is caused to prevent stalls with
row locks as described in log.cc:binlog_report_wait_for. This immediate
count is also counted a second time in binlog_group_commit_reason_transaction.

Overall binlog_group_commits = binlog_group_commit_reason_count +
binlog_group_commit_reason_usec + binlog_group_commit_reason_transaction

This work was funded thanks to Open Source Developers Club Australia.
This commit is contained in:
Daniel Black
2015-03-19 15:26:58 +11:00
parent c14d9c21f0
commit 54287adc27
6 changed files with 291 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

98
mysql-test/suite/binlog/r/binlog_commit_wait.result
View File

@ -4,6 +4,14 @@ SET @old_count= @@GLOBAL.binlog_commit_wait_count;
SET GLOBAL binlog_commit_wait_count= 3;
SET @old_usec= @@GLOBAL.binlog_commit_wait_usec;
SET GLOBAL binlog_commit_wait_usec= 20000000;
SELECT variable_value INTO @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
SELECT variable_value INTO @group_commit_reason_count FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_count';
SELECT variable_value INTO @group_commit_reason_usec FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_usec';
SELECT variable_value INTO @group_commit_reason_transaction FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_transaction';
SET @a= current_timestamp();
BEGIN;
INSERT INTO t1 VALUES (1,0);
@ -13,6 +21,22 @@ SET @b= unix_timestamp(current_timestamp()) - unix_timestamp(@a);
SELECT IF(@b < 20, "Ok", CONCAT("Error: too much time elapsed: ", @b, " seconds >= 20"));
IF(@b < 20, "Ok", CONCAT("Error: too much time elapsed: ", @b, " seconds >= 20"))
Ok
SELECT variable_value - @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
variable_value - @group_commits
1
SELECT variable_value - @group_commit_reason_count FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_count';
variable_value - @group_commit_reason_count
0
SELECT variable_value - @group_commit_reason_usec FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_usec';
variable_value - @group_commit_reason_usec
0
SELECT variable_value - @group_commit_reason_transaction FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_transaction';
variable_value - @group_commit_reason_transaction
1
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
SET @a= current_timestamp();
INSERT INTO t1 VALUES (2,0);
@ -22,6 +46,22 @@ SET @b= unix_timestamp(current_timestamp()) - unix_timestamp(@a);
SELECT IF(@b < 20, "Ok", CONCAT("Error: too much time elapsed: ", @b, " seconds >= 20"));
IF(@b < 20, "Ok", CONCAT("Error: too much time elapsed: ", @b, " seconds >= 20"))
Ok
SELECT variable_value - @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
variable_value - @group_commits
2
SELECT variable_value - @group_commit_reason_count FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_count';
variable_value - @group_commit_reason_count
1
SELECT variable_value - @group_commit_reason_usec FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_usec';
variable_value - @group_commit_reason_usec
0
SELECT variable_value - @group_commit_reason_transaction FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_transaction';
variable_value - @group_commit_reason_transaction
1
SET @a= current_timestamp();
INSERT INTO t1 VALUES (6,0);
BEGIN;
@ -36,6 +76,22 @@ SET @b= unix_timestamp(current_timestamp()) - unix_timestamp(@a);
SELECT IF(@b < 20, "Ok", CONCAT("Error: too much time elapsed: ", @b, " seconds >= 20"));
IF(@b < 20, "Ok", CONCAT("Error: too much time elapsed: ", @b, " seconds >= 20"))
Ok
SELECT variable_value - @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
variable_value - @group_commits
3
SELECT variable_value - @group_commit_reason_count FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_count';
variable_value - @group_commit_reason_count
1
SELECT variable_value - @group_commit_reason_usec FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_usec';
variable_value - @group_commit_reason_usec
0
SELECT variable_value - @group_commit_reason_transaction FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_transaction';
variable_value - @group_commit_reason_transaction
2
SET @a= current_timestamp();
INSERT INTO t1 VALUES (7,0);
INSERT INTO t1 VALUES (8,0);
@ -43,6 +99,47 @@ SET @b= unix_timestamp(current_timestamp()) - unix_timestamp(@a);
SELECT IF(@b < 20, "Ok", CONCAT("Error: too much time elapsed: ", @b, " seconds >= 20"));
IF(@b < 20, "Ok", CONCAT("Error: too much time elapsed: ", @b, " seconds >= 20"))
Ok
SELECT variable_value - @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
variable_value - @group_commits
4
SELECT variable_value - @group_commit_reason_count FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_count';
variable_value - @group_commit_reason_count
2
SELECT variable_value - @group_commit_reason_usec FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_usec';
variable_value - @group_commit_reason_usec
0
SELECT variable_value - @group_commit_reason_transaction FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_transaction';
variable_value - @group_commit_reason_transaction
2
SET @a= current_timestamp();
SET GLOBAL binlog_commit_wait_usec= 5*1000*1000;
INSERT INTO t1 VALUES (9,0);
SET @b= unix_timestamp(current_timestamp()) - unix_timestamp(@a);
SELECT IF(@b < 4, CONCAT("Error: too little time elapsed: ", @b, " seconds < 4"),
IF(@b < 20, "Ok", CONCAT("Error: too much time elapsed: ", @b, " seconds >= 20")));
IF(@b < 4, CONCAT("Error: too little time elapsed: ", @b, " seconds < 4"),
IF(@b < 20, "Ok", CONCAT("Error: too much time elapsed: ", @b, " seconds >= 20")))
Ok
SELECT variable_value - @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
variable_value - @group_commits
5
SELECT variable_value - @group_commit_reason_count FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_count';
variable_value - @group_commit_reason_count
2
SELECT variable_value - @group_commit_reason_usec FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_usec';
variable_value - @group_commit_reason_usec
1
SELECT variable_value - @group_commit_reason_transaction FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_transaction';
variable_value - @group_commit_reason_transaction
2
SELECT * FROM t1 ORDER BY a;
a b
1 11
@ -52,6 +149,7 @@ a b
6 0
7 0
8 0
9 0
DROP TABLE t1;
SET GLOBAL binlog_commit_wait_count= @old_count;
SET GLOBAL binlog_commit_wait_usec= @old_usec;

88
mysql-test/suite/binlog/t/binlog_commit_wait.test
View File

@ -13,6 +13,20 @@ connect(con1,localhost,root,,test);
connect(con2,localhost,root,,test);
connect(con3,localhost,root,,test);
# Get Initial status measurements
--connection default
SELECT variable_value INTO @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
SELECT variable_value INTO @group_commit_reason_count FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_count';
SELECT variable_value INTO @group_commit_reason_usec FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_usec';
SELECT variable_value INTO @group_commit_reason_transaction FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_transaction';
# Note: binlog_group_commits is counted at the start of the group and group_commit_reason_* is
# counted near when the groups its finalised.
# Check that if T2 goes to wait for a row lock of T1 while T1 is waiting for
# more transactions to arrive for group commit, the commit of T1 will complete
# immediately.
@ -37,6 +51,18 @@ reap;
SET @b= unix_timestamp(current_timestamp()) - unix_timestamp(@a);
SELECT IF(@b < 20, "Ok", CONCAT("Error: too much time elapsed: ", @b, " seconds >= 20"));
# before: binlog_group_commit=0, binlog_group_commit_reason_count=0
# before: binlog_group_commit_reason_usec=0, binlog_group_commit_reason_transaction=0
# after: binlog_group_commit+1 by reason of binlog_group_commit_reason_transaction+1
SELECT variable_value - @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
SELECT variable_value - @group_commit_reason_count FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_count';
SELECT variable_value - @group_commit_reason_usec FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_usec';
SELECT variable_value - @group_commit_reason_transaction FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_transaction';
--connection con2
--error ER_DUP_ENTRY
reap;
@ -64,6 +90,17 @@ reap;
SET @b= unix_timestamp(current_timestamp()) - unix_timestamp(@a);
SELECT IF(@b < 20, "Ok", CONCAT("Error: too much time elapsed: ", @b, " seconds >= 20"));
# before: binlog_group_commit=1, binlog_group_commit_reason_count=0
# before: binlog_group_commit_reason_usec=0, binlog_group_commit_reason_transaction=1
# after: binlog_group_commit+1 by reason of binlog_group_commit_reason_count+1
SELECT variable_value - @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
SELECT variable_value - @group_commit_reason_count FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_count';
SELECT variable_value - @group_commit_reason_usec FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_usec';
SELECT variable_value - @group_commit_reason_transaction FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_transaction';
# Test that commit triggers immediately if there is already a transaction
# waiting on another transaction that reaches its commit.
@ -99,6 +136,18 @@ reap;
SET @b= unix_timestamp(current_timestamp()) - unix_timestamp(@a);
SELECT IF(@b < 20, "Ok", CONCAT("Error: too much time elapsed: ", @b, " seconds >= 20"));
# before: binlog_group_commit=2, binlog_group_commit_reason_count=1
# before: binlog_group_commit_reason_usec=0, binlog_group_commit_reason_transaction=1
# after: binlog_group_commit+1 by reason of binlog_group_commit_reason_transaction+1
SELECT variable_value - @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
SELECT variable_value - @group_commit_reason_count FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_count';
SELECT variable_value - @group_commit_reason_usec FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_usec';
SELECT variable_value - @group_commit_reason_transaction FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_transaction';
--connection default
SET @a= current_timestamp();
@ -114,6 +163,45 @@ reap;
SET @b= unix_timestamp(current_timestamp()) - unix_timestamp(@a);
SELECT IF(@b < 20, "Ok", CONCAT("Error: too much time elapsed: ", @b, " seconds >= 20"));
# before: binlog_group_commit=3, binlog_group_commit_reason_count=1
# before: binlog_group_commit_reason_usec=0, binlog_group_commit_reason_transaction=2
# after: binlog_group_commit+1 by reason of binlog_group_commit_reason_count+1
SELECT variable_value - @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
SELECT variable_value - @group_commit_reason_count FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_count';
SELECT variable_value - @group_commit_reason_usec FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_usec';
SELECT variable_value - @group_commit_reason_transaction FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_transaction';
# Test that when the binlog_commit_wait_usec is reached the tranction gets a group commit
--connection default
SET @a= current_timestamp();
SET GLOBAL binlog_commit_wait_usec= 5*1000*1000;
--connection con1
reap;
INSERT INTO t1 VALUES (9,0);
--connection default
SET @b= unix_timestamp(current_timestamp()) - unix_timestamp(@a);
SELECT IF(@b < 4, CONCAT("Error: too little time elapsed: ", @b, " seconds < 4"),
IF(@b < 20, "Ok", CONCAT("Error: too much time elapsed: ", @b, " seconds >= 20")));
# before: binlog_group_commit=4, binlog_group_commit_reason_count=2
# before: binlog_group_commit_reason_usec=0, binlog_group_commit_reason_transaction=2
# after: binlog_group_commit+1 by reason of binlog_group_commit_reason_usec+1
SELECT variable_value - @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
SELECT variable_value - @group_commit_reason_count FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_count';
SELECT variable_value - @group_commit_reason_usec FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_usec';
SELECT variable_value - @group_commit_reason_transaction FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_transaction';
--connection default
SELECT * FROM t1 ORDER BY a;

30
mysql-test/suite/rpl/r/rpl_parallel_multilevel2.result
View File

@ -16,6 +16,16 @@ SET @old_updates= @@GLOBAL.binlog_direct_non_transactional_updates;
SET GLOBAL binlog_direct_non_transactional_updates=OFF;
SET SESSION binlog_direct_non_transactional_updates=OFF;
CHANGE MASTER TO master_use_gtid=current_pos;
SELECT variable_value INTO @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
SELECT variable_value INTO @group_commit_reason_count FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_count';
SELECT variable_value INTO @group_commit_reason_usec FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_usec';
SELECT variable_value INTO @group_commit_reason_transaction FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_transaction';
SELECT variable_value INTO @group_commit_reason_immediate FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_immediate';
SET @old_parallel_threads=@@GLOBAL.slave_parallel_threads;
include/stop_slave.inc
SET GLOBAL slave_parallel_threads=10;
@ -37,6 +47,26 @@ include/sync_with_master_gtid.inc
SELECT * FROM t1 ORDER BY a;
a b
1 10
SELECT variable_value - @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
variable_value - @group_commits
3
SELECT variable_value - @group_commit_reason_count FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_count';
variable_value - @group_commit_reason_count
0
SELECT variable_value - @group_commit_reason_usec FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_usec';
variable_value - @group_commit_reason_usec
3
SELECT variable_value - @group_commit_reason_transaction FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_transaction';
variable_value - @group_commit_reason_transaction
0
SELECT variable_value - @group_commit_reason_immediate FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_immediate';
variable_value - @group_commit_reason_immediate
0
include/stop_slave.inc
SET GLOBAL slave_parallel_threads=@old_parallel_threads;
SET GLOBAL binlog_commit_wait_count=@old_commit_count;

30
mysql-test/suite/rpl/t/rpl_parallel_multilevel2.test
View File

@ -27,6 +27,24 @@ SET GLOBAL binlog_direct_non_transactional_updates=OFF;
SET SESSION binlog_direct_non_transactional_updates=OFF;
CHANGE MASTER TO master_use_gtid=current_pos;
# Get Initial status measurements
# we take out measurements from server_2 as that's where
# the its critical that 3 separate binlog_group_commits occur
SELECT variable_value INTO @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
SELECT variable_value INTO @group_commit_reason_count FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_count';
SELECT variable_value INTO @group_commit_reason_usec FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_usec';
SELECT variable_value INTO @group_commit_reason_transaction FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_transaction';
SELECT variable_value INTO @group_commit_reason_immediate FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_immediate';
# Note: binlog_group_commits is counted at the start of the group and group_commit_reason_* is
# counted near when the groups its finalised.
--connection server_3
--sync_with_master
--save_master_pos
@ -56,6 +74,18 @@ SELECT * FROM t1 ORDER BY a;
--source include/sync_with_master_gtid.inc
SELECT * FROM t1 ORDER BY a;
# Measure status(es)
--connection server_2
SELECT variable_value - @group_commits FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commits';
SELECT variable_value - @group_commit_reason_count FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_count';
SELECT variable_value - @group_commit_reason_usec FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_usec';
SELECT variable_value - @group_commit_reason_transaction FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_transaction';
SELECT variable_value - @group_commit_reason_immediate FROM information_schema.global_status
WHERE variable_name = 'binlog_group_commit_reason_immediate';
# Clean up

43
sql/log.cc
View File

@ -95,6 +95,10 @@ mysql_mutex_t LOCK_commit_ordered;
static ulonglong binlog_status_var_num_commits;
static ulonglong binlog_status_var_num_group_commits;
static ulonglong binlog_status_group_commit_reason_count;
static ulonglong binlog_status_group_commit_reason_immediate;
static ulonglong binlog_status_group_commit_reason_transaction;
static ulonglong binlog_status_group_commit_reason_usec;
static char binlog_snapshot_file[FN_REFLEN];
static ulonglong binlog_snapshot_position;
@ -104,6 +108,14 @@ static SHOW_VAR binlog_status_vars_detail[]=
(char *)&binlog_status_var_num_commits, SHOW_LONGLONG},
{"group_commits",
(char *)&binlog_status_var_num_group_commits, SHOW_LONGLONG},
{"group_commit_reason_count",
(char *)&binlog_status_group_commit_reason_count, SHOW_LONGLONG},
{"group_commit_reason_immediate",
(char *)&binlog_status_group_commit_reason_immediate, SHOW_LONGLONG},
{"group_commit_reason_transaction",
(char *)&binlog_status_group_commit_reason_transaction, SHOW_LONGLONG},
{"group_commit_reason_usec",
(char *)&binlog_status_group_commit_reason_usec, SHOW_LONGLONG},
{"snapshot_file",
(char *)&binlog_snapshot_file, SHOW_CHAR},
{"snapshot_position",
@ -3035,6 +3047,8 @@ MYSQL_BIN_LOG::MYSQL_BIN_LOG(uint *sync_period)
bytes_written(0), file_id(1), open_count(1),
group_commit_queue(0), group_commit_queue_busy(FALSE),
num_commits(0), num_group_commits(0),
group_commit_reason_count(0), group_commit_reason_usec(0),
group_commit_reason_transaction(0), group_commit_reason_immediate(0),
sync_period_ptr(sync_period), sync_counter(0),
state_file_deleted(false), binlog_state_recover_done(false),
is_relay_log(0), signal_cnt(0),
@ -7543,8 +7557,18 @@ MYSQL_BIN_LOG::wait_for_sufficient_commits()
mysql_mutex_assert_owner(&LOCK_prepare_ordered);
for (e= last_head= group_commit_queue, count= 0; e; e= e->next)
if (++count >= opt_binlog_commit_wait_count || unlikely(e->thd->has_waiter))
{
if (++count >= opt_binlog_commit_wait_count)
{
group_commit_reason_count++;
return;
}
if (unlikely(e->thd->has_waiter))
{
group_commit_reason_transaction++;
return;
}
}
mysql_mutex_unlock(&LOCK_log);
set_timespec_nsec(wait_until, (ulonglong)1000*opt_binlog_commit_wait_usec);
@ -7557,18 +7581,30 @@ MYSQL_BIN_LOG::wait_for_sufficient_commits()
err= mysql_cond_timedwait(&COND_prepare_ordered, &LOCK_prepare_ordered,
&wait_until);
if (err == ETIMEDOUT)
{
group_commit_reason_usec++;
break;
}
if (unlikely(last_head->thd->has_waiter))
{
group_commit_reason_transaction++;
break;
}
head= group_commit_queue;
for (e= head; e && e != last_head; e= e->next)
{
++count;
if (unlikely(e->thd->has_waiter))
{
group_commit_reason_transaction++;
goto after_loop;
}
}
if (count >= opt_binlog_commit_wait_count)
{
group_commit_reason_count++;
break;
}
last_head= head;
}
after_loop:
@ -7603,6 +7639,7 @@ MYSQL_BIN_LOG::binlog_trigger_immediate_group_commit()
head= group_commit_queue;
if (head)
{
group_commit_reason_immediate++;
head->thd->has_waiter= true;
mysql_cond_signal(&COND_prepare_ordered);
}
@ -9746,6 +9783,10 @@ TC_LOG_BINLOG::set_status_variables(THD *thd)
mysql_mutex_lock(&LOCK_commit_ordered);
binlog_status_var_num_commits= this->num_commits;
binlog_status_var_num_group_commits= this->num_group_commits;
binlog_status_group_commit_reason_count= this->group_commit_reason_count;
binlog_status_group_commit_reason_usec= this->group_commit_reason_usec;
binlog_status_group_commit_reason_transaction= this->group_commit_reason_transaction;
binlog_status_group_commit_reason_immediate= this->group_commit_reason_immediate;
if (!have_snapshot)
{
set_binlog_snapshot_file(last_commit_pos_file);

3
sql/log.h
View File

@ -515,6 +515,9 @@ class MYSQL_BIN_LOG: public TC_LOG, private MYSQL_LOG
ulonglong num_commits;
/* Number of group commits done. */
ulonglong num_group_commits;
/* The reason why the group commit was grouped */
ulonglong group_commit_reason_count, group_commit_reason_usec;
ulonglong group_commit_reason_transaction, group_commit_reason_immediate;
/* pointer to the sync period variable, for binlog this will be
sync_binlog_period, for relay log this will be