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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
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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;