WL#9630 : Change innodb_max_dirty_pages_pct_lwm default to 10

  Changed compiled default value of innodb_max_dirty_pages_pct_lwm
  from 0 to 10.

  Reviewed by : sunny Bains <[email protected]>
  Reviewed by : satya Bodapati <[email protected]>
  RB : 16799

Author: mayprasa

mysql-test/suite/sys_vars/r/innodb_max_dirty_pages_pct_basic.result

@@ -5,7 +5,7 @@ SELECT @global_start_value;
 SET @global_start_max_dirty_lwm_value = @@global.innodb_max_dirty_pages_pct_lwm;
 SELECT @global_start_max_dirty_lwm_value;
 @global_start_max_dirty_lwm_value
-0
+10
 SET @@global.innodb_max_dirty_pages_pct_lwm = 0;
 SELECT @@global.innodb_max_dirty_pages_pct_lwm;
 @@global.innodb_max_dirty_pages_pct_lwm
@@ -169,4 +169,4 @@ SELECT @@global.innodb_max_dirty_pages_pct;
 SET @@global.innodb_max_dirty_pages_pct_lwm = @global_start_max_dirty_lwm_value;
 SELECT @@global.innodb_max_dirty_pages_pct_lwm;
 @@global.innodb_max_dirty_pages_pct_lwm
-0.000000
+10.000000

mysql-test/suite/sys_vars/r/innodb_max_dirty_pages_pct_lwm_basic.result

@@ -1,7 +1,7 @@
 SET @pct_lwm_start_value = @@global.innodb_max_dirty_pages_pct_lwm;
 SELECT @pct_lwm_start_value;
 @pct_lwm_start_value
-0
+10
 SET @pct_start_value = @@global.innodb_max_dirty_pages_pct;
 SELECT @pct_start_value;
 @pct_start_value
@@ -11,13 +11,13 @@ SET @@global.innodb_max_dirty_pages_pct_lwm = 0;
 SET @@global.innodb_max_dirty_pages_pct_lwm = DEFAULT;
 SELECT @@global.innodb_max_dirty_pages_pct_lwm;
 @@global.innodb_max_dirty_pages_pct_lwm
-0.000000
+10.000000
 '#---------------------FN_DYNVARS_046_02-------------------------#'
 SET innodb_max_dirty_pages_pct_lwm = 1;
 ERROR HY000: Variable 'innodb_max_dirty_pages_pct_lwm' is a GLOBAL variable and should be set with SET GLOBAL
 SELECT @@innodb_max_dirty_pages_pct_lwm;
 @@innodb_max_dirty_pages_pct_lwm
-0.000000
+10.000000
 SELECT local.innodb_max_dirty_pages_pct_lwm;
 ERROR 42S02: Unknown table 'local' in field list
 SET global innodb_max_dirty_pages_pct_lwm = 0;
@@ -128,4 +128,4 @@ SELECT @@global.innodb_max_dirty_pages_pct;
 SET @@global.innodb_max_dirty_pages_pct_lwm = @pct_lwm_start_value;
 SELECT @@global.innodb_max_dirty_pages_pct_lwm;
 @@global.innodb_max_dirty_pages_pct_lwm
-0.000000
+10.000000

storage/innobase/handler/ha_innodb.cc

@@ -20807,7 +20807,7 @@ static MYSQL_SYSVAR_DOUBLE(max_dirty_pages_pct_lwm,
   srv_max_dirty_pages_pct_lwm,
   PLUGIN_VAR_RQCMDARG,
   "Percentage of dirty pages at which flushing kicks in.",
-  NULL, innodb_max_dirty_pages_pct_lwm_update, 0, 0, 99.999, 0);
+  NULL, innodb_max_dirty_pages_pct_lwm_update, 10, 0, 99.999, 0);
 
 static MYSQL_SYSVAR_ULONG(adaptive_flushing_lwm,
   srv_adaptive_flushing_lwm,