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# Online DDL operations that rebuild the table write temporary sort files
# to the MySQL temporary directory during index creation. Each temporary
# sort file is corresponds to a secondary index in the table.
# This test tracks the IOs on these temp sort files during the table rebuild
# operation. Aim is to detect any change from the current numbers.
# Increase in the numbers must be justified, reducing the numbers should be
# welcomed.
--source include/have_nodebug.inc
--source include/big_test.inc
--source include/not_windows.inc
# By default push build system uses tmpfs to run the tests. We need to
# create the temp files on the real file system to be able to track the temp
# files usage. On MacOS, /var is symlinked to /private/var.
SET innodb_tmpdir='/var/tmp';
CREATE DATABASE test_db;
--DELIMITER //
CREATE PROCEDURE test_db.check_read_write_io_threshold(IN threshold DOUBLE)
BEGIN
SELECT
SUM_NUMBER_OF_BYTES_READ < threshold AS is_total_read_less_than_threshold,
SUM_NUMBER_OF_BYTES_WRITE < threshold AS is_total_written_less_than_threshold,
ABS(SUM_NUMBER_OF_BYTES_READ - SUM_NUMBER_OF_BYTES_WRITE) <=
(10 * 1024 * 1024) AS is_read_write_within_tolerance
FROM performance_schema.file_summary_by_instance
WHERE file_name LIKE '%/var/tmp/Innodb Merge Temp File';
END //
--DELIMITER ;
--echo
--echo # Prepare the table with 18 non-clustered indexes
--exec $MYSQL test < $MYSQLTEST_VARDIR/std_data/bug36444172/dump.sql
SELECT COUNT(*) FROM test_db.test_table;
--echo
SHOW CREATE TABLE test_db.test_table;
let $default_ddl_threads=`SELECT @@innodb_ddl_threads`;
--echo #
--echo # Test#1 : Rebuild the table with default settings
--echo #
--echo
--echo # Reset the PFS table
# To measure the temp sort files stats of the DDL operatation next.
TRUNCATE `performance_schema`.`file_summary_by_instance`;
--echo
--echo # Rebuild the table.
ALTER TABLE test_db.test_table ENGINE INNODB, ALGORITHM=INPLACE;
--echo
--echo # check the read/write IO on the temp sort files with default settings
CALL test_db.check_read_write_io_threshold(2.15 * 1024 * 1024 * 1024);
--echo #
--echo # Test#2 : Increase the DDL threads, IOs must remain as they were before
--echo #
--echo # Double the DDL threads.
SET innodb_ddl_threads=8;
--echo # Reset the PFS table
TRUNCATE `performance_schema`.`file_summary_by_instance`;
--echo # Rebuild the table.
ALTER TABLE test_db.test_table ENGINE INNODB, ALGORITHM=INPLACE;
CALL test_db.check_read_write_io_threshold(2.15 * 1024 * 1024 * 1024);
--echo #
--echo # Test#3 : Reduce the DDL threads, IOs must remain as they were before.
--echo #
--echo # Use one DDL thread
SET innodb_ddl_threads=1;
--echo # Reset the PFS table
TRUNCATE `performance_schema`.`file_summary_by_instance`;
--echo # Rebuild the table.
ALTER TABLE test_db.test_table ENGINE INNODB, ALGORITHM=INPLACE;
CALL test_db.check_read_write_io_threshold(2.15 * 1024 * 1024 * 1024);
--echo #
--echo # Test#4 : Increase the DDL Buffer size, IO should be reduced this time
--echo #
--echo # Set buffer large enough as would have been the case prior to WL#14283
--echo # ddl_threads(1) * ddl_buffer_size(18MB) = 18 MB
SET innodb_ddl_buffer_size=18874368;
--echo # Reset the PFS table
TRUNCATE `performance_schema`.`file_summary_by_instance`;
--echo # Rebuild the table.
ALTER TABLE test_db.test_table ENGINE INNODB, ALGORITHM=INPLACE;
CALL test_db.check_read_write_io_threshold(1.15 * 1024 * 1024 * 1024);
--echo # Reset to default
eval SET innodb_ddl_threads=$default_ddl_threads;
--echo #
--echo # Test#5 : Reduce the DDL Buffer size, IO should increase again
--echo #
--echo # Set it 3MB, that is ddl_threads(4) * ddl_buffer_size(3MB) = 12MB
SET innodb_ddl_buffer_size=3145728;
--echo # Reset the PFS table
TRUNCATE `performance_schema`.`file_summary_by_instance`;
--echo # Rebuild the table.
ALTER TABLE test_db.test_table ENGINE INNODB, ALGORITHM=INPLACE;
CALL test_db.check_read_write_io_threshold(1.75 * 1024 * 1024 * 1024);
--echo
DROP DATABASE test_db;
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