################################################################################
# Test script to test working of innodb_idle_flush_pct.
################################################################################

--source include/have_debug.inc

--echo #########
--echo # Setup #
--echo #########
CREATE TABLE t1 (c INT);
INSERT INTO t1 VALUES (1), (2), (3), (4);

SET @innodb_io_capacity_saved = @@global.innodb_io_capacity;
SET @innodb_idle_flush_pct_saved = @@global.innodb_idle_flush_pct;

# Set io capacity to 200
SET GLOBAL innodb_io_capacity = 200;
SHOW VARIABLES LIKE "%innodb_io_capacity%";

# Disable page cleaner
SET GLOBAL innodb_page_cleaner_disabled_debug = 1;

# Set varaible to 0 so no flush happens
set global innodb_idle_flush_pct=0;

# Enable monitoring of Innodb
SET GLOBAL innodb_monitor_enable = all;

# Make sure counter are 0
SELECT COUNT=0 FROM INFORMATION_SCHEMA.INNODB_METRICS
  WHERE NAME='buffer_flush_batch_total_pages';

# Every page keeps 2 recods max
SET GLOBAL innodb_limit_optimistic_insert_debug=2;

# Insert multiple rows to make sure we have enough pages dirty
insert into t1 select * from t1;
insert into t1 select * from t1;
insert into t1 select * from t1;
insert into t1 select * from t1;
insert into t1 select * from t1;
insert into t1 select * from t1;

# Till now we must have some dirty pages in Buffer Pool
--sleep 2

# Total dirty pages in buffer pool
SELECT COUNT>0 FROM INFORMATION_SCHEMA.INNODB_METRICS
  WHERE NAME='buffer_pool_pages_dirty';

# Noting would have flushed yet, so counter should be 0
SELECT COUNT=0 FROM INFORMATION_SCHEMA.INNODB_METRICS
  WHERE NAME='buffer_flush_batch_total_pages';

# Enable page cleaner
SET GLOBAL innodb_page_cleaner_disabled_debug = 0;

# Set varaible to value > 0 so that flush happens
SET GLOBAL innodb_idle_flush_pct=25;

# Let flush happen
--echo # Waiting for buffer pool pages to get flushed
let $wait_condition=SELECT COUNT=0 FROM INFORMATION_SCHEMA.INNODB_METRICS
                    WHERE NAME='buffer_pool_pages_dirty';
--source include/wait_condition.inc

# Pages should have been flushed now
SELECT COUNT>0 FROM INFORMATION_SCHEMA.INNODB_METRICS
  WHERE NAME='buffer_flush_background_total_pages';

--echo ###########
--echo # Cleanup #
--echo ###########
SET GLOBAL innodb_io_capacity = @innodb_io_capacity_saved;
SET GLOBAL innodb_idle_flush_pct = @innodb_idle_flush_pct_saved;
SET GLOBAL innodb_limit_optimistic_insert_debug=0;
SET GLOBAL innodb_monitor_disable = all;
SET GLOBAL innodb_monitor_reset_all = all;
SELECT COUNT>0 FROM INFORMATION_SCHEMA.INNODB_METRICS
  WHERE NAME='buffer_flush_background_total_pages';
--disable_warnings
SET GLOBAL innodb_monitor_disable = default;
SET GLOBAL innodb_monitor_enable = default;
SET GLOBAL innodb_monitor_reset_all = default;
--enable_warnings
DROP TABLE t1;