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/*
Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
This handler was developed by Mikael Ronstrom for version 5.1 of MySQL.
It is an abstraction layer on top of other handlers such as MyISAM,
InnoDB, Federated, Berkeley DB and so forth. Partitioned tables can also
be handled by a storage engine. The current example of this is NDB
Cluster that has internally handled partitioning. This have benefits in
that many loops needed in the partition handler can be avoided.
Partitioning has an inherent feature which in some cases is positive and
in some cases is negative. It splits the data into chunks. This makes
the data more manageable, queries can easily be parallelised towards the
parts and indexes are split such that there are less levels in the
index trees. The inherent disadvantage is that to use a split index
one has to scan all index parts which is ok for large queries but for
small queries it can be a disadvantage.
Partitioning lays the foundation for more manageable databases that are
extremely large. It does also lay the foundation for more parallelism
in the execution of queries. This functionality will grow with later
versions of MySQL.
You can enable it in your buld by doing the following during your build
process:
./configure --with-partition
The partition is setup to use table locks. It implements an partition "SHARE"
that is inserted into a hash by table name. You can use this to store
information of state that any partition handler object will be able to see
if it is using the same table.
Please read the object definition in ha_partition.h before reading the rest
if this file.
*/
#include "sql_priv.h"
#include "sql_parse.h" // append_file_to_dir
#include "binlog.h" // mysql_bin_log
#ifdef WITH_PARTITION_STORAGE_ENGINE
#include "ha_partition.h"
#include "sql_table.h" // tablename_to_filename
#include "key.h"
#include "sql_plugin.h"
#include "sql_partition.h"
#include "sql_show.h" // append_identifier
#include "sql_admin.h" // SQL_ADMIN_MSG_TEXT_SIZE
#include "debug_sync.h"
using std::min;
using std::max;
/* First 4 bytes in the .par file is the number of 32-bit words in the file */
#define PAR_WORD_SIZE 4
/* offset to the .par file checksum */
#define PAR_CHECKSUM_OFFSET 4
/* offset to the total number of partitions */
#define PAR_NUM_PARTS_OFFSET 8
/* offset to the engines array */
#define PAR_ENGINES_OFFSET 12
#define PARTITION_ENABLED_TABLE_FLAGS (HA_FILE_BASED | \
HA_REC_NOT_IN_SEQ | \
HA_CAN_REPAIR)
#define PARTITION_DISABLED_TABLE_FLAGS (HA_CAN_GEOMETRY | \
HA_CAN_FULLTEXT | \
HA_DUPLICATE_POS | \
HA_CAN_SQL_HANDLER | \
HA_CAN_INSERT_DELAYED | \
HA_READ_BEFORE_WRITE_REMOVAL)
static const char *ha_par_ext= ".par";
/****************************************************************************
MODULE create/delete handler object
****************************************************************************/
static handler *partition_create_handler(handlerton *hton,
TABLE_SHARE *share,
MEM_ROOT *mem_root);
static uint partition_flags();
static uint alter_table_flags(uint flags);
/****************************************************************************
Check whether the partition column order changes after alter
****************************************************************************/
static bool check_partition_column_order(List<Create_field> *create_list,
Field** field_arary);
#ifdef HAVE_PSI_INTERFACE
PSI_mutex_key key_partition_auto_inc_mutex;
static PSI_mutex_info all_partition_mutexes[]=
{
{ &key_partition_auto_inc_mutex, "Partition_share::auto_inc_mutex", 0}
};
static void init_partition_psi_keys(void)
{
const char* category= "partition";
int count;
count= array_elements(all_partition_mutexes);
mysql_mutex_register(category, all_partition_mutexes, count);
}
#endif /* HAVE_PSI_INTERFACE */
static int partition_initialize(void *p)
{
handlerton *partition_hton;
partition_hton= (handlerton *)p;
partition_hton->state= SHOW_OPTION_YES;
partition_hton->db_type= DB_TYPE_PARTITION_DB;
partition_hton->create= partition_create_handler;
partition_hton->partition_flags= partition_flags;
partition_hton->alter_table_flags= alter_table_flags;
partition_hton->flags= HTON_NOT_USER_SELECTABLE |
HTON_HIDDEN |
HTON_TEMPORARY_NOT_SUPPORTED;
#ifdef HAVE_PSI_INTERFACE
init_partition_psi_keys();
#endif
return 0;
}
/**
Initialize and allocate space for partitions shares.
@param num_parts Number of partitions to allocate storage for.
@return Operation status.
@retval true Failure (out of memory).
@retval false Success.
*/
bool Partition_share::init(uint num_parts)
{
DBUG_ENTER("Partition_share::init");
mysql_mutex_init(key_partition_auto_inc_mutex,
&auto_inc_mutex,
MY_MUTEX_INIT_FAST);
auto_inc_initialized= false;
partition_name_hash_initialized= false;
next_auto_inc_val= 0;
partitions_share_refs= new Parts_share_refs;
if (!partitions_share_refs)
DBUG_RETURN(true);
if (partitions_share_refs->init(num_parts))
{
delete partitions_share_refs;
DBUG_RETURN(true);
}
DBUG_RETURN(false);
}
/*
Create new partition handler
SYNOPSIS
partition_create_handler()
table Table object
RETURN VALUE
New partition object
*/
static handler *partition_create_handler(handlerton *hton,
TABLE_SHARE *share,
MEM_ROOT *mem_root)
{
ha_partition *file= new (mem_root) ha_partition(hton, share);
if (file && file->initialize_partition(mem_root))
{
delete file;
file= 0;
}
return file;
}
/*
HA_CAN_PARTITION:
Used by storage engines that can handle partitioning without this
partition handler
(Partition, NDB)
HA_CAN_UPDATE_PARTITION_KEY:
Set if the handler can update fields that are part of the partition
function.
HA_CAN_PARTITION_UNIQUE:
Set if the handler can handle unique indexes where the fields of the
unique key are not part of the fields of the partition function. Thus
a unique key can be set on all fields.
HA_USE_AUTO_PARTITION
Set if the handler sets all tables to be partitioned by default.
*/
static uint partition_flags()
{
return HA_CAN_PARTITION;
}
static uint alter_table_flags(uint flags MY_ATTRIBUTE((unused)))
{
return (HA_PARTITION_FUNCTION_SUPPORTED |
HA_FAST_CHANGE_PARTITION);
}
static bool check_partition_column_order(List<Create_field> *create_list,
Field** field_arary)
{
Field **f_ptr;
List_iterator_fast<Create_field> new_field_it;
Create_field *new_field= NULL;
new_field_it.init(*create_list);
for (f_ptr= field_arary ; *f_ptr; f_ptr++)
{
while ((new_field= new_field_it++))
{
if (new_field->field == *f_ptr)
break;
}
if (!new_field)
break;
}
if (!new_field)
{
/* Not same order, INPLACE cannot be allowed!*/
return false;
}
return true;
}
const uint32 ha_partition::NO_CURRENT_PART_ID= NOT_A_PARTITION_ID;
/*
Constructor method
SYNOPSIS
ha_partition()
table Table object
RETURN VALUE
NONE
*/
ha_partition::ha_partition(handlerton *hton, TABLE_SHARE *share)
:handler(hton, share)
{
DBUG_ENTER("ha_partition::ha_partition(table)");
init_handler_variables();
DBUG_VOID_RETURN;
}
/*
Constructor method
SYNOPSIS
ha_partition()
part_info Partition info
RETURN VALUE
NONE
*/
ha_partition::ha_partition(handlerton *hton, partition_info *part_info)
:handler(hton, NULL)
{
DBUG_ENTER("ha_partition::ha_partition(part_info)");
DBUG_ASSERT(part_info);
init_handler_variables();
m_part_info= part_info;
m_create_handler= TRUE;
m_is_sub_partitioned= m_part_info->is_sub_partitioned();
DBUG_VOID_RETURN;
}
/**
ha_partition constructor method used by ha_partition::clone()
@param hton Handlerton (partition_hton)
@param share Table share object
@param part_info_arg partition_info to use
@param clone_arg ha_partition to clone
@param clme_mem_root_arg MEM_ROOT to use
@return New partition handler
*/
ha_partition::ha_partition(handlerton *hton, TABLE_SHARE *share,
partition_info *part_info_arg,
ha_partition *clone_arg,
MEM_ROOT *clone_mem_root_arg)
:handler(hton, share)
{
DBUG_ENTER("ha_partition::ha_partition(clone)");
init_handler_variables();
m_part_info= part_info_arg;
m_create_handler= TRUE;
m_is_sub_partitioned= m_part_info->is_sub_partitioned();
m_is_clone_of= clone_arg;
m_clone_mem_root= clone_mem_root_arg;
part_share= clone_arg->part_share;
m_tot_parts= clone_arg->m_tot_parts;
m_pkey_is_clustered= clone_arg->primary_key_is_clustered();
DBUG_VOID_RETURN;
}
/*
Initialize handler object
SYNOPSIS
init_handler_variables()
RETURN VALUE
NONE
*/
void ha_partition::init_handler_variables()
{
active_index= MAX_KEY;
m_mode= 0;
m_open_test_lock= 0;
m_file_buffer= NULL;
m_name_buffer_ptr= NULL;
m_engine_array= NULL;
m_file= NULL;
m_file_tot_parts= 0;
m_reorged_file= NULL;
m_new_file= NULL;
m_reorged_parts= 0;
m_added_file= NULL;
m_tot_parts= 0;
m_pkey_is_clustered= 0;
m_part_spec.start_part= NO_CURRENT_PART_ID;
m_scan_value= 2;
m_ref_length= 0;
m_part_spec.end_part= NO_CURRENT_PART_ID;
m_index_scan_type= partition_no_index_scan;
m_start_key.key= NULL;
m_start_key.length= 0;
m_myisam= FALSE;
m_innodb= FALSE;
m_extra_cache= FALSE;
m_extra_cache_size= 0;
m_extra_prepare_for_update= FALSE;
m_extra_cache_part_id= NO_CURRENT_PART_ID;
m_handler_status= handler_not_initialized;
m_low_byte_first= 1;
m_part_field_array= NULL;
m_ordered_rec_buffer= NULL;
m_top_entry= NO_CURRENT_PART_ID;
m_rec_length= 0;
m_last_part= 0;
m_rec0= 0;
m_err_rec= NULL;
m_curr_key_info[0]= NULL;
m_curr_key_info[1]= NULL;
m_part_func_monotonicity_info= NON_MONOTONIC;
auto_increment_lock= FALSE;
auto_increment_safe_stmt_log_lock= FALSE;
/*
this allows blackhole to work properly
*/
m_num_locks= 0;
m_part_info= NULL;
m_create_handler= FALSE;
m_is_sub_partitioned= 0;
m_is_clone_of= NULL;
m_clone_mem_root= NULL;
part_share= NULL;
m_new_partitions_share_refs.empty();
m_part_ids_sorted_by_num_of_records= NULL;
m_sec_sort_by_rowid= false;
#ifdef DONT_HAVE_TO_BE_INITALIZED
m_start_key.flag= 0;
m_ordered= TRUE;
#endif
}
const char *ha_partition::table_type() const
{
// we can do this since we only support a single engine type
return m_file[0]->table_type();
}
/*
Destructor method
SYNOPSIS
~ha_partition()
RETURN VALUE
NONE
*/
ha_partition::~ha_partition()
{
DBUG_ENTER("ha_partition::~ha_partition()");
if (m_new_partitions_share_refs.elements)
m_new_partitions_share_refs.delete_elements();
if (m_file != NULL)
{
uint i;
for (i= 0; i < m_tot_parts; i++)
delete m_file[i];
}
destroy_record_priority_queue();
my_free(m_part_ids_sorted_by_num_of_records);
clear_handler_file();
DBUG_VOID_RETURN;
}
/*
Initialize partition handler object
SYNOPSIS
initialize_partition()
mem_root Allocate memory through this
RETURN VALUE
1 Error
0 Success
DESCRIPTION
The partition handler is only a layer on top of other engines. Thus it
can't really perform anything without the underlying handlers. Thus we
add this method as part of the allocation of a handler object.
1) Allocation of underlying handlers
If we have access to the partition info we will allocate one handler
instance for each partition.
2) Allocation without partition info
The cases where we don't have access to this information is when called
in preparation for delete_table and rename_table and in that case we
only need to set HA_FILE_BASED. In that case we will use the .par file
that contains information about the partitions and their engines and
the names of each partition.
3) Table flags initialisation
We need also to set table flags for the partition handler. This is not
static since it depends on what storage engines are used as underlying
handlers.
The table flags is set in this routine to simulate the behaviour of a
normal storage engine
The flag HA_FILE_BASED will be set independent of the underlying handlers
4) Index flags initialisation
When knowledge exists on the indexes it is also possible to initialize the
index flags. Again the index flags must be initialized by using the under-
lying handlers since this is storage engine dependent.
The flag HA_READ_ORDER will be reset for the time being to indicate no
ordered output is available from partition handler indexes. Later a merge
sort will be performed using the underlying handlers.
5) primary_key_is_clustered, has_transactions and low_byte_first is
calculated here.
*/
bool ha_partition::initialize_partition(MEM_ROOT *mem_root)
{
handler **file_array, *file;
ulonglong check_table_flags;
DBUG_ENTER("ha_partition::initialize_partition");
if (m_create_handler)
{
m_tot_parts= m_part_info->get_tot_partitions();
DBUG_ASSERT(m_tot_parts > 0);
if (new_handlers_from_part_info(mem_root))
DBUG_RETURN(1);
}
else if (!table_share || !table_share->normalized_path.str)
{
/*
Called with dummy table share (delete, rename and alter table).
Don't need to set-up anything.
*/
DBUG_RETURN(0);
}
else if (get_from_handler_file(table_share->normalized_path.str,
mem_root, false))
{
my_error(ER_FAILED_READ_FROM_PAR_FILE, MYF(0));
DBUG_RETURN(1);
}
/*
We create all underlying table handlers here. We do it in this special
method to be able to report allocation errors.
Set up low_byte_first, primary_key_is_clustered and
has_transactions since they are called often in all kinds of places,
other parameters are calculated on demand.
Verify that all partitions have the same table_flags.
*/
check_table_flags= m_file[0]->ha_table_flags();
m_low_byte_first= m_file[0]->low_byte_first();
m_pkey_is_clustered= TRUE;
file_array= m_file;
do
{
file= *file_array;
if (m_low_byte_first != file->low_byte_first())
{
// Cannot have handlers with different endian
my_error(ER_MIX_HANDLER_ERROR, MYF(0));
DBUG_RETURN(1);
}
if (!file->primary_key_is_clustered())
m_pkey_is_clustered= FALSE;
if (check_table_flags != file->ha_table_flags())
{
my_error(ER_MIX_HANDLER_ERROR, MYF(0));
DBUG_RETURN(1);
}
} while (*(++file_array));
m_handler_status= handler_initialized;
DBUG_RETURN(0);
}
/****************************************************************************
MODULE meta data changes
****************************************************************************/
/*
Delete a table
SYNOPSIS
delete_table()
name Full path of table name
RETURN VALUE
>0 Error
0 Success
DESCRIPTION
Used to delete a table. By the time delete_table() has been called all
opened references to this table will have been closed (and your globally
shared references released. The variable name will just be the name of
the table. You will need to remove any files you have created at this
point.
If you do not implement this, the default delete_table() is called from
handler.cc and it will delete all files with the file extentions returned
by bas_ext().
Called from handler.cc by delete_table and ha_create_table(). Only used
during create if the table_flag HA_DROP_BEFORE_CREATE was specified for
the storage engine.
*/
int ha_partition::delete_table(const char *name)
{
DBUG_ENTER("ha_partition::delete_table");
DBUG_RETURN(del_ren_table(name, NULL));
}
/*
Rename a table
SYNOPSIS
rename_table()
from Full path of old table name
to Full path of new table name
RETURN VALUE
>0 Error
0 Success
DESCRIPTION
Renames a table from one name to another from alter table call.
If you do not implement this, the default rename_table() is called from
handler.cc and it will rename all files with the file extentions returned
by bas_ext().
Called from sql_table.cc by mysql_rename_table().
*/
int ha_partition::rename_table(const char *from, const char *to)
{
DBUG_ENTER("ha_partition::rename_table");
DBUG_RETURN(del_ren_table(from, to));
}
/*
Create the handler file (.par-file)
SYNOPSIS
create_handler_files()
name Full path of table name
create_info Create info generated for CREATE TABLE
RETURN VALUE
>0 Error
0 Success
DESCRIPTION
create_handler_files is called to create any handler specific files
before opening the file with openfrm to later call ::create on the
file object.
In the partition handler this is used to store the names of partitions
and types of engines in the partitions.
*/
int ha_partition::create_handler_files(const char *path,
const char *old_path,
int action_flag,
HA_CREATE_INFO *create_info)
{
DBUG_ENTER("ha_partition::create_handler_files()");
/*
We need to update total number of parts since we might write the handler
file as part of a partition management command
*/
if (action_flag == CHF_DELETE_FLAG ||
action_flag == CHF_RENAME_FLAG)
{
char name[FN_REFLEN];
char old_name[FN_REFLEN];
strxmov(name, path, ha_par_ext, NullS);
strxmov(old_name, old_path, ha_par_ext, NullS);
if ((action_flag == CHF_DELETE_FLAG &&
mysql_file_delete(key_file_partition, name, MYF(MY_WME))) ||
(action_flag == CHF_RENAME_FLAG &&
mysql_file_rename(key_file_partition, old_name, name, MYF(MY_WME))))
{
DBUG_RETURN(TRUE);
}
}
else if (action_flag == CHF_CREATE_FLAG)
{
if (create_handler_file(path))
{
my_error(ER_CANT_CREATE_HANDLER_FILE, MYF(0));
DBUG_RETURN(1);
}
}
DBUG_RETURN(0);
}
/*
Create a partitioned table
SYNOPSIS
create()
name Full path of table name
table_arg Table object
create_info Create info generated for CREATE TABLE
RETURN VALUE
>0 Error
0 Success
DESCRIPTION
create() is called to create a table. The variable name will have the name
of the table. When create() is called you do not need to worry about
opening the table. Also, the FRM file will have already been created so
adjusting create_info will not do you any good. You can overwrite the frm
file at this point if you wish to change the table definition, but there
are no methods currently provided for doing that.
Called from handler.cc by ha_create_table().
*/
int ha_partition::create(const char *name, TABLE *table_arg,
HA_CREATE_INFO *create_info)
{
int error;
char name_buff[FN_REFLEN], name_lc_buff[FN_REFLEN];
char *name_buffer_ptr;
const char *path;
uint i;
List_iterator_fast <partition_element> part_it(m_part_info->partitions);
partition_element *part_elem;
handler **file, **abort_file;
DBUG_ENTER("ha_partition::create");
DBUG_ASSERT(*fn_rext((char*)name) == '\0');
/* Not allowed to create temporary partitioned tables */
if (create_info && create_info->options & HA_LEX_CREATE_TMP_TABLE)
{
my_error(ER_PARTITION_NO_TEMPORARY, MYF(0));
DBUG_RETURN(TRUE);
}
if (get_from_handler_file(name, ha_thd()->mem_root, false))
DBUG_RETURN(TRUE);
DBUG_ASSERT(m_file_buffer);
DBUG_PRINT("enter", ("name: (%s)", name));
name_buffer_ptr= m_name_buffer_ptr;
file= m_file;
/*
Since ha_partition has HA_FILE_BASED, it must alter underlying table names
if they do not have HA_FILE_BASED and lower_case_table_names == 2.
See Bug#37402, for Mac OS X.
The appended #P#<partname>[#SP#<subpartname>] will remain in current case.
Using the first partitions handler, since mixing handlers is not allowed.
*/
path= get_canonical_filename(*file, name, name_lc_buff);
for (i= 0; i < m_part_info->num_parts; i++)
{
part_elem= part_it++;
if (m_is_sub_partitioned)
{
uint j;
List_iterator_fast <partition_element> sub_it(part_elem->subpartitions);
for (j= 0; j < m_part_info->num_subparts; j++)
{
part_elem= sub_it++;
create_partition_name(name_buff, path, name_buffer_ptr,
NORMAL_PART_NAME, FALSE);
if ((error= set_up_table_before_create(table_arg, name_buff,
create_info, part_elem)) ||
((error= (*file)->ha_create(name_buff, table_arg, create_info))))
goto create_error;
name_buffer_ptr= strend(name_buffer_ptr) + 1;
file++;
}
}
else
{
create_partition_name(name_buff, path, name_buffer_ptr,
NORMAL_PART_NAME, FALSE);
if ((error= set_up_table_before_create(table_arg, name_buff,
create_info, part_elem)) ||
((error= (*file)->ha_create(name_buff, table_arg, create_info))))
goto create_error;
name_buffer_ptr= strend(name_buffer_ptr) + 1;
file++;
}
}
DBUG_RETURN(0);
create_error:
name_buffer_ptr= m_name_buffer_ptr;
for (abort_file= file, file= m_file; file < abort_file; file++)
{
create_partition_name(name_buff, path, name_buffer_ptr, NORMAL_PART_NAME,
FALSE);
(void) (*file)->ha_delete_table((const char*) name_buff);
name_buffer_ptr= strend(name_buffer_ptr) + 1;
}
handler::delete_table(name);
DBUG_RETURN(error);
}
/*
Drop partitions as part of ALTER TABLE of partitions
SYNOPSIS
drop_partitions()
path Complete path of db and table name
RETURN VALUE
>0 Failure
0 Success
DESCRIPTION
Use part_info object on handler object to deduce which partitions to
drop (each partition has a state attached to it)
*/
int ha_partition::drop_partitions(const char *path)
{
List_iterator<partition_element> part_it(m_part_info->partitions);
char part_name_buff[FN_REFLEN];
uint num_parts= m_part_info->partitions.elements;
uint num_subparts= m_part_info->num_subparts;
uint i= 0;
uint name_variant;
int ret_error;
int error= 0;
DBUG_ENTER("ha_partition::drop_partitions");
/*
Assert that it works without HA_FILE_BASED and lower_case_table_name = 2.
We use m_file[0] as long as all partitions have the same storage engine.
*/
DBUG_ASSERT(!strcmp(path, get_canonical_filename(m_file[0], path,
part_name_buff)));
do
{
partition_element *part_elem= part_it++;
if (part_elem->part_state == PART_TO_BE_DROPPED)
{
handler *file;
/*
This part is to be dropped, meaning the part or all its subparts.
*/
name_variant= NORMAL_PART_NAME;
if (m_is_sub_partitioned)
{
List_iterator<partition_element> sub_it(part_elem->subpartitions);
uint j= 0, part;
do
{
partition_element *sub_elem= sub_it++;
part= i * num_subparts + j;
create_subpartition_name(part_name_buff, path,
part_elem->partition_name,
sub_elem->partition_name, name_variant);
file= m_file[part];
DBUG_PRINT("info", ("Drop subpartition %s", part_name_buff));
if ((ret_error= file->ha_delete_table(part_name_buff)))
error= ret_error;
if (deactivate_ddl_log_entry(sub_elem->log_entry->entry_pos))
error= 1;
} while (++j < num_subparts);
}
else
{
create_partition_name(part_name_buff, path,
part_elem->partition_name, name_variant,
TRUE);
file= m_file[i];
DBUG_PRINT("info", ("Drop partition %s", part_name_buff));
if ((ret_error= file->ha_delete_table(part_name_buff)))
error= ret_error;
if (deactivate_ddl_log_entry(part_elem->log_entry->entry_pos))
error= 1;
}
if (part_elem->part_state == PART_IS_CHANGED)
part_elem->part_state= PART_NORMAL;
else
part_elem->part_state= PART_IS_DROPPED;
}
} while (++i < num_parts);
(void) sync_ddl_log();
DBUG_RETURN(error);
}
/*
Rename partitions as part of ALTER TABLE of partitions
SYNOPSIS
rename_partitions()
path Complete path of db and table name
RETURN VALUE
TRUE Failure
FALSE Success
DESCRIPTION
When reorganising partitions, adding hash partitions and coalescing
partitions it can be necessary to rename partitions while holding
an exclusive lock on the table.
Which partitions to rename is given by state of partitions found by the
partition info struct referenced from the handler object
*/
int ha_partition::rename_partitions(const char *path)
{
List_iterator<partition_element> part_it(m_part_info->partitions);
List_iterator<partition_element> temp_it(m_part_info->temp_partitions);
char part_name_buff[FN_REFLEN];
char norm_name_buff[FN_REFLEN];
uint num_parts= m_part_info->partitions.elements;
uint part_count= 0;
uint num_subparts= m_part_info->num_subparts;
uint i= 0;
uint j= 0;
int error= 0;
int ret_error;
uint temp_partitions= m_part_info->temp_partitions.elements;
handler *file;
partition_element *part_elem, *sub_elem;
DBUG_ENTER("ha_partition::rename_partitions");
/*
Assert that it works without HA_FILE_BASED and lower_case_table_name = 2.
We use m_file[0] as long as all partitions have the same storage engine.
*/
DBUG_ASSERT(!strcmp(path, get_canonical_filename(m_file[0], path,
norm_name_buff)));
DEBUG_SYNC(ha_thd(), "before_rename_partitions");
if (temp_partitions)
{
/*
These are the reorganised partitions that have already been copied.
We delete the partitions and log the delete by inactivating the
delete log entry in the table log. We only need to synchronise
these writes before moving to the next loop since there is no
interaction among reorganised partitions, they cannot have the
same name.
*/
do
{
part_elem= temp_it++;
if (m_is_sub_partitioned)
{
List_iterator<partition_element> sub_it(part_elem->subpartitions);
j= 0;
do
{
sub_elem= sub_it++;
file= m_reorged_file[part_count++];
create_subpartition_name(norm_name_buff, path,
part_elem->partition_name,
sub_elem->partition_name,
NORMAL_PART_NAME);
DBUG_PRINT("info", ("Delete subpartition %s", norm_name_buff));
if ((ret_error= file->ha_delete_table(norm_name_buff)))
error= ret_error;
else if (deactivate_ddl_log_entry(sub_elem->log_entry->entry_pos))
error= 1;
else
sub_elem->log_entry= NULL; /* Indicate success */
} while (++j < num_subparts);
}
else
{
file= m_reorged_file[part_count++];
create_partition_name(norm_name_buff, path,
part_elem->partition_name, NORMAL_PART_NAME,
TRUE);
DBUG_PRINT("info", ("Delete partition %s", norm_name_buff));
if ((ret_error= file->ha_delete_table(norm_name_buff)))
error= ret_error;
else if (deactivate_ddl_log_entry(part_elem->log_entry->entry_pos))
error= 1;
else
part_elem->log_entry= NULL; /* Indicate success */
}
} while (++i < temp_partitions);
(void) sync_ddl_log();
}
i= 0;
do
{
/*
When state is PART_IS_CHANGED it means that we have created a new
TEMP partition that is to be renamed to normal partition name and
we are to delete the old partition with currently the normal name.
We perform this operation by
1) Delete old partition with normal partition name
2) Signal this in table log entry
3) Synch table log to ensure we have consistency in crashes
4) Rename temporary partition name to normal partition name
5) Signal this to table log entry
It is not necessary to synch the last state since a new rename
should not corrupt things if there was no temporary partition.
The only other parts we need to cater for are new parts that
replace reorganised parts. The reorganised parts were deleted
by the code above that goes through the temp_partitions list.
Thus the synch above makes it safe to simply perform step 4 and 5
for those entries.
*/
part_elem= part_it++;
if (part_elem->part_state == PART_IS_CHANGED ||
part_elem->part_state == PART_TO_BE_DROPPED ||
(part_elem->part_state == PART_IS_ADDED && temp_partitions))
{
if (m_is_sub_partitioned)
{
List_iterator<partition_element> sub_it(part_elem->subpartitions);