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XtraDB 1.1.8-29.0

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This commit is contained in:
Sergei Golubchik 2012-10-16 10:36:28 +02:00
commit d9a8799205
30 changed files with 2118 additions and 66 deletions
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295
storage/xtradb/handler/i_s.cc
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@ -22,6 +22,14 @@ InnoDB INFORMATION SCHEMA tables interface to MySQL.
Created July 18, 2007 Vasil Dimov
*******************************************************/
#ifndef MYSQL_SERVER
#define MYSQL_SERVER /* For Item_* classes */
#include <item.h>
/* Prevent influence of this definition to other headers */
#undef MYSQL_SERVER
#else
#include <mysql_priv.h>
#endif //MYSQL_SERVER
#include <ctype.h> /*toupper*/
#include <mysqld_error.h>
@ -45,6 +53,7 @@ extern "C" {
#include "dict0mem.h"
#include "dict0types.h"
#include "ha_prototypes.h" /* for innobase_convert_name() */
#include "srv0srv.h" /* for srv_track_changed_pages */
#include "srv0start.h" /* for srv_was_started */
#include "trx0i_s.h"
#include "trx0trx.h" /* for TRX_QUE_STATE_STR_MAX_LEN */
@ -54,6 +63,7 @@ extern "C" {
#include "dict0dict.h" /* for dict_sys */
#include "buf0lru.h" /* for XTRA_LRU_[DUMP/RESTORE] */
#include "btr0btr.h" /* for btr_page_get_index_id */
#include "log0online.h"
}
#define OK(expr) \
@ -5266,3 +5276,288 @@ UNIV_INTERN struct st_maria_plugin i_s_innodb_undo_logs =
INNODB_VERSION_STR, MariaDB_PLUGIN_MATURITY_STABLE
};
static ST_FIELD_INFO i_s_innodb_changed_pages_info[] =
{
{STRUCT_FLD(field_name, "space_id"),
STRUCT_FLD(field_length, MY_INT32_NUM_DECIMAL_DIGITS),
STRUCT_FLD(field_type, MYSQL_TYPE_LONG),
STRUCT_FLD(value, 0),
STRUCT_FLD(field_flags, MY_I_S_UNSIGNED),
STRUCT_FLD(old_name, ""),
STRUCT_FLD(open_method, SKIP_OPEN_TABLE)},
{STRUCT_FLD(field_name, "page_id"),
STRUCT_FLD(field_length, MY_INT32_NUM_DECIMAL_DIGITS),
STRUCT_FLD(field_type, MYSQL_TYPE_LONG),
STRUCT_FLD(value, 0),
STRUCT_FLD(field_flags, MY_I_S_UNSIGNED),
STRUCT_FLD(old_name, ""),
STRUCT_FLD(open_method, SKIP_OPEN_TABLE)},
{STRUCT_FLD(field_name, "start_lsn"),
STRUCT_FLD(field_length, MY_INT64_NUM_DECIMAL_DIGITS),
STRUCT_FLD(field_type, MYSQL_TYPE_LONGLONG),
STRUCT_FLD(value, 0),
STRUCT_FLD(field_flags, MY_I_S_UNSIGNED),
STRUCT_FLD(old_name, ""),
STRUCT_FLD(open_method, SKIP_OPEN_TABLE)},
{STRUCT_FLD(field_name, "end_lsn"),
STRUCT_FLD(field_length, MY_INT64_NUM_DECIMAL_DIGITS),
STRUCT_FLD(field_type, MYSQL_TYPE_LONGLONG),
STRUCT_FLD(value, 0),
STRUCT_FLD(field_flags, MY_I_S_UNSIGNED),
STRUCT_FLD(old_name, ""),
STRUCT_FLD(open_method, SKIP_OPEN_TABLE)},
END_OF_ST_FIELD_INFO
};
/***********************************************************************
This function parses condition and gets upper bounds for start and end LSN's
if condition corresponds to certain pattern.
We can't know right position to avoid scanning bitmap files from the beginning
to the lower bound. But we can stop scanning bitmap files if we reach upper bound.
It's expected the most used queries will be like the following:
SELECT * FROM INNODB_CHANGED_PAGES WHERE START_LSN > num1 AND start_lsn < num2;
That's why the pattern is:
pattern: comp | and_comp;
comp: lsn < int_num | lsn <= int_num | int_num > lsn | int_num >= lsn;
lsn: start_lsn | end_lsn;
and_comp: some_expression AND some_expression | some_expression AND and_comp;
some_expression: comp | any_other_expression;
Suppose the condition is start_lsn < 100, this means we have to read all
blocks with start_lsn < 100. Which is equivalent to reading all the blocks
with end_lsn <= 99, or just end_lsn < 100. That's why it's enough to find
maximum lsn value, doesn't matter if this is start or end lsn and compare
it with "start_lsn" field.
Example:
SELECT * FROM INNODB_CHANGED_PAGES
WHERE
start_lsn > 10 AND
end_lsn <= 1111 AND
555 > end_lsn AND
page_id = 100;
max_lsn will be set to 555.
*/
static
void
limit_lsn_range_from_condition(
/*===========================*/
TABLE* table, /*!<in: table */
COND* cond, /*!<in: condition */
ib_uint64_t* max_lsn) /*!<in/out: maximum LSN
(must be initialized with maximum
available value) */
{
if (cond->type() != Item::COND_ITEM &&
cond->type() != Item::FUNC_ITEM)
return;
switch (((Item_func*) cond)->functype())
{
case Item_func::COND_AND_FUNC:
{
List_iterator<Item> li(*((Item_cond*) cond)->
argument_list());
Item *item;
while ((item= li++))
limit_lsn_range_from_condition(table,
item,
max_lsn);
break;
}
case Item_func::LT_FUNC:
case Item_func::LE_FUNC:
case Item_func::GT_FUNC:
case Item_func::GE_FUNC:
{
Item *left;
Item *right;
Item_field *item_field;
ib_uint64_t tmp_result;
/*
a <= b equals to b >= a that's why we just exchange
"left" and "right" in the case of ">" or ">="
function
*/
if (((Item_func*) cond)->functype() ==
Item_func::LT_FUNC ||
((Item_func*) cond)->functype() ==
Item_func::LE_FUNC)
{
left = ((Item_func*) cond)->arguments()[0];
right = ((Item_func*) cond)->arguments()[1];
} else {
left = ((Item_func*) cond)->arguments()[1];
right = ((Item_func*) cond)->arguments()[0];
}
if (!left || !right)
return;
if (left->type() != Item::FIELD_ITEM)
return;
if (right->type() != Item::INT_ITEM)
return;
item_field = (Item_field*)left;
if (/* START_LSN */
table->field[2] != item_field->field &&
/* END_LSN */
table->field[3] != item_field->field)
{
return;
}
/* Check if the current field belongs to our table */
if (table != item_field->field->table)
return;
tmp_result = right->val_int();
if (tmp_result < *max_lsn)
*max_lsn = tmp_result;
break;
}
default:;
}
}
/***********************************************************************
Fill the dynamic table information_schema.innodb_changed_pages.
@return 0 on success, 1 on failure */
static
int
i_s_innodb_changed_pages_fill(
/*==========================*/
THD* thd, /*!<in: thread */
TABLE_LIST* tables, /*!<in/out: tables to fill */
COND* cond) /*!<in: condition */
{
TABLE* table = (TABLE *) tables->table;
log_bitmap_iterator_t i;
ib_uint64_t output_rows_num = 0UL;
ib_uint64_t max_lsn = ~0ULL;
if (!srv_track_changed_pages)
return 0;
if (!log_online_bitmap_iterator_init(&i))
return 1;
if (cond)
limit_lsn_range_from_condition(table, cond, &max_lsn);
while(log_online_bitmap_iterator_next(&i) &&
(!srv_changed_pages_limit ||
output_rows_num < srv_changed_pages_limit) &&
/*
There is no need to compare both start LSN and end LSN fields
with maximum value. It's enough to compare only start LSN.
Example:
max_lsn = 100
\\\\\\\\\\\\\\\\\\\\\\\\\|\\\\\\\\ - Query 1
I------I I-------I I-------------I I----I
////////////////// | - Query 2
1 2 3 4
Query 1:
SELECT * FROM INNODB_CHANGED_PAGES WHERE start_lsn < 100
will select 1,2,3 bitmaps
Query 2:
SELECT * FROM INNODB_CHANGED_PAGES WHERE end_lsn < 100
will select 1,2 bitmaps
The condition start_lsn <= 100 will be false after reading
1,2,3 bitmaps which suits for both cases.
*/
LOG_BITMAP_ITERATOR_START_LSN(i) <= max_lsn)
{
if (!LOG_BITMAP_ITERATOR_PAGE_CHANGED(i))
continue;
/* SPACE_ID */
table->field[0]->store(
LOG_BITMAP_ITERATOR_SPACE_ID(i));
/* PAGE_ID */
table->field[1]->store(
LOG_BITMAP_ITERATOR_PAGE_NUM(i));
/* START_LSN */
table->field[2]->store(
LOG_BITMAP_ITERATOR_START_LSN(i));
/* END_LSN */
table->field[3]->store(
LOG_BITMAP_ITERATOR_END_LSN(i));
/*
I_S tables are in-memory tables. If bitmap file is big enough
a lot of memory can be used to store the table. But the size
of used memory can be diminished if we store only data which
corresponds to some conditions (in WHERE sql clause). Here
conditions are checked for the field values stored above.
Conditions are checked twice. The first is here (during table
generation) and the second during query execution. Maybe it
makes sense to use some flag in THD object to avoid double
checking.
*/
if (cond && !cond->val_int())
continue;
if (schema_table_store_record(thd, table))
{
log_online_bitmap_iterator_release(&i);
return 1;
}
++output_rows_num;
}
log_online_bitmap_iterator_release(&i);
return 0;
}
static
int
i_s_innodb_changed_pages_init(
/*==========================*/
void* p)
{
DBUG_ENTER("i_s_innodb_changed_pages_init");
ST_SCHEMA_TABLE* schema = (ST_SCHEMA_TABLE*) p;
schema->fields_info = i_s_innodb_changed_pages_info;
schema->fill_table = i_s_innodb_changed_pages_fill;
DBUG_RETURN(0);
}
UNIV_INTERN struct st_maria_plugin i_s_innodb_changed_pages =
{
STRUCT_FLD(type, MYSQL_INFORMATION_SCHEMA_PLUGIN),
STRUCT_FLD(info, &i_s_info),
STRUCT_FLD(name, "INNODB_CHANGED_PAGES"),
STRUCT_FLD(author, "Percona"),
STRUCT_FLD(descr, "InnoDB CHANGED_PAGES table"),
STRUCT_FLD(license, PLUGIN_LICENSE_GPL),
STRUCT_FLD(init, i_s_innodb_changed_pages_init),
STRUCT_FLD(deinit, i_s_common_deinit),
STRUCT_FLD(version, 0x0100 /* 1.0 */),
STRUCT_FLD(status_vars, NULL),
STRUCT_FLD(system_vars, NULL),
INNODB_VERSION_STR, MariaDB_PLUGIN_MATURITY_STABLE
};