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cleanup: handlerton

Browse source 
remove unused methods, reorder methods, add comments
This commit is contained in:
Sergei Golubchik 2024-08-25 14:07:44 +02:00
parent 8087cefc07
commit 126d6d787c
10 changed files with 412 additions and 445 deletions
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3
mysql-test/main/information_schema.result
View file

@ -2327,6 +2327,9 @@ LOGFILE_GROUP_NAME, FILE_NAME, ENGINE
ORDER BY
LOGFILE_GROUP_NAME;
LOGFILE_GROUP_NAME FILE_NAME TOTAL_EXTENTS INITIAL_SIZE ENGINE EXTRA
Warnings:
Warning 1287 'information_schema.FILES' is deprecated and will be removed in a future release
Warning 1287 'information_schema.FILES' is deprecated and will be removed in a future release
# This must have Opened_tables=3, not 6.
show status like 'Opened_tables';
Variable_name Value

4
mysql-test/suite/innodb/r/tablespace_per_table_not_windows.result
View file

@ -116,6 +116,10 @@ test/#################################################_long_
twenty_byte_db_name_/#################################################_long_
##################################################_long/#################################################_long
SELECT file_name, tablespace_name FROM information_schema.files WHERE file_name LIKE '%long%';
Warnings:
Level Warning
Code 1287
Message 'information_schema.FILES' is deprecated and will be removed in a future release
#
# Cleanup
#

4
mysql-test/suite/innodb/r/tablespace_per_table_windows.result
View file

@ -42,6 +42,10 @@ SELECT name FROM information_schema.innodb_sys_tablespaces WHERE name LIKE '%lon
name
this_sixty_four_byte_name_is_not_too_long_______________________/this_sixty_four_byte_name_is_not_too_long_______________________
SELECT file_name, tablespace_name FROM information_schema.files WHERE file_name LIKE '%long%';
Warnings:
Level Warning
Code 1287
Message 'information_schema.FILES' is deprecated and will be removed in a future release
#
# Cleanup
#

15
sql/handler.cc
View file

@ -888,21 +888,6 @@ void ha_drop_database(const char* path)
}
static my_bool checkpoint_state_handlerton(THD *, plugin_ref plugin, void *disable)
{
handlerton *hton= plugin_hton(plugin);
if (hton->checkpoint_state)
hton->checkpoint_state(hton, (int) *(bool*) disable);
return FALSE;
}
void ha_checkpoint_state(bool disable)
{
plugin_foreach(NULL, checkpoint_state_handlerton, MYSQL_STORAGE_ENGINE_PLUGIN, &disable);
}
struct st_commit_checkpoint_request {
void *cookie;
void (*pre_hook)(void *);

787
sql/handler.h
View file

@ -1258,12 +1258,6 @@ typedef struct st_order ORDER;
handlerton is a singleton structure - one instance per storage engine -
to provide access to storage engine functionality that works on the
"global" level (unlike handler class that works on a per-table basis)
usually handlerton instance is defined statically in ha_xxx.cc as
static handlerton { ... } xxx_hton;
savepoint_*, prepare, recover, and *_by_xid pointers can be 0.
*/
struct handlerton
{
@ -1281,150 +1275,243 @@ struct handlerton
thd->ha_data[xxx_hton.slot]
slot number is initialized by MySQL after xxx_init() is called.
*/
uint slot;
/*
to store per-savepoint data storage engine is provided with an area
of a requested size (0 is ok here).
savepoint_offset must be initialized statically to the size of
the needed memory to store per-savepoint information.
After xxx_init it is changed to be an offset to savepoint storage
area and need not be used by storage engine.
see binlog_hton and binlog_savepoint_set/rollback for an example.
*/
uint savepoint_offset;
/*
handlerton methods:
*/
uint slot;
/*
to store per-savepoint data storage engine is provided with an area
of a requested size (0 is ok here).
savepoint_offset must be initialized statically to the size of
the needed memory to store per-savepoint information.
After xxx_init it is changed to be an offset to savepoint storage
area and need not be used by storage engine.
see binlog_hton and binlog_savepoint_set/rollback for an example.
*/
uint savepoint_offset;
/*
global handlerton flags HTON_...
*/
uint32 flags;
/*
Optional clauses in the CREATE/ALTER TABLE
*/
ha_create_table_option *table_options; // table level options
ha_create_table_option *field_options; // these are specified per field
ha_create_table_option *index_options; // these are specified per index
close_connection is only called if
thd->ha_data[xxx_hton.slot] is non-zero, so even if you don't need
this storage area - set it to something, so that MySQL would know
this storage engine was accessed in this connection
*/
int (*close_connection)(handlerton *hton, THD *thd);
/*
Tell handler that query has been killed.
*/
void (*kill_query)(handlerton *hton, THD *thd, enum thd_kill_levels level);
/*
sv points to an uninitialized storage area of requested size
(see savepoint_offset description)
*/
int (*savepoint_set)(handlerton *hton, THD *thd, void *sv);
/*
sv points to a storage area, that was earlier passed
to the savepoint_set call
*/
int (*savepoint_rollback)(handlerton *hton, THD *thd, void *sv);
/**
Check if storage engine allows to release metadata locks which were
acquired after the savepoint if rollback to savepoint is done.
@return true - If it is safe to release MDL locks.
false - If it is not.
*/
bool (*savepoint_rollback_can_release_mdl)(handlerton *hton, THD *thd);
int (*savepoint_release)(handlerton *hton, THD *thd, void *sv);
/*
'all' is true if it's a real commit, that makes persistent changes
'all' is false if it's not in fact a commit but an end of the
statement that is part of the transaction.
NOTE 'all' is also false in auto-commit mode where 'end of statement'
and 'real commit' mean the same event.
*/
int (*commit)(handlerton *hton, THD *thd, bool all);
/*
The commit_ordered() method is called prior to the commit() method, after
the transaction manager has decided to commit (not rollback) the
transaction. Unlike commit(), commit_ordered() is called only when the
full transaction is committed, not for each commit of statement
transaction in a multi-statement transaction.
/**
The list of extensions of files created for a single table in the
database directory (datadir/db_name/).
Not that like prepare(), commit_ordered() is only called when 2-phase
commit takes place. Ie. when no binary log and only a single engine
participates in a transaction, one commit() is called, no
commit_ordered(). So engines must be prepared for this.
Used by open_table_error(), by the default rename_table and delete_table
handler methods, and by the default discovery implementation.
The calls to commit_ordered() in multiple parallel transactions is
guaranteed to happen in the same order in every participating
handler. This can be used to ensure the same commit order among multiple
handlers (eg. in table handler and binlog). So if transaction T1 calls
into commit_ordered() of handler A before T2, then T1 will also call
commit_ordered() of handler B before T2.
For engines that have more than one file name extensions (separate
metadata, index, and/or data files), the order of elements is relevant.
First element of engine file name extensions array should be metadata
file extention. This is assumed by the open_table_error()
and the default discovery implementation.
Engines that implement this method should during this call make the
transaction visible to other transactions, thereby making the order of
transaction commits be defined by the order of commit_ordered() calls.
Second element - data file extension. This is
assumed by REPAIR TABLE ... USE_FRM implementation.
*/
const char **tablefile_extensions; // by default - empty list
The intention is that commit_ordered() should do the minimal amount of
work that needs to happen in consistent commit order among handlers. To
preserve ordering, calls need to be serialised on a global mutex, so
doing any time-consuming or blocking operations in commit_ordered() will
limit scalability.
/**********************************************************************
Generic handlerton methods
**********************************************************************/
handler *(*create)(handlerton *hton, TABLE_SHARE *table, MEM_ROOT *mem_root);
/*
close_connection is only called if
thd->ha_data[xxx_hton.slot] is non-zero, so even if you don't need
this storage area - set it to something, so that MySQL would know
this storage engine was accessed in this connection
*/
int (*close_connection)(handlerton *hton, THD *thd);
/*
Tell handler that query has been killed.
*/
void (*kill_query)(handlerton *hton, THD *thd, enum thd_kill_levels level);
void (*drop_database)(handlerton *hton, char* path);
/*
return 0 if dropped successfully,
-1 if nothing was done by design (as in e.g. blackhole)
an error code (e.g. HA_ERR_NO_SUCH_TABLE) otherwise
*/
int (*drop_table)(handlerton *hton, const char* path);
int (*panic)(handlerton *hton, enum ha_panic_function flag);
/** Disable or enable the internal writes of a storage engine
Handlers can rely on commit_ordered() calls to be serialised (no two
calls can run in parallel, so no extra locking on the handler part is
required to ensure this).
This is used by Galera and by
FLUSH TABLES WITH READ LOCK AND DISABLE CHECKPOINT
Note that commit_ordered() can be called from a different thread than the
one handling the transaction! So it can not do anything that depends on
thread local storage, in particular it can not call my_error() and
friends (instead it can store the error code and delay the call of
my_error() to the commit() method).
While internal writes are disabled, the engine should pause any
background write activity (such as tablespace checkpointing) that require
consistency between different files (such as transaction log and
tablespace files) for crash recovery to succeed. The idea is to use this
to make safe multi-volume LVM snapshot backups.
*/
void (*disable_internal_writes)(bool disable);
Similarly, since commit_ordered() returns void, any return error code
must be saved and returned from the commit() method instead.
bool (*flush_logs)(handlerton *hton);
bool (*show_status)(handlerton *hton, THD *thd, stat_print_fn *print, enum ha_stat_type stat);
uint (*partition_flags)();
alter_table_operations (*alter_table_flags)(alter_table_operations flags);
The commit_ordered method is optional, and can be left unset if not
needed in a particular handler (then there will be no ordering guarantees
wrt. other engines and binary log).
*/
void (*commit_ordered)(handlerton *hton, THD *thd, bool all);
int (*rollback)(handlerton *hton, THD *thd, bool all);
int (*prepare)(handlerton *hton, THD *thd, bool all);
/*
The prepare_ordered method is optional. If set, it will be called after
successful prepare() in all handlers participating in 2-phase
commit. Like commit_ordered(), it is called only when the full
transaction is committed, not for each commit of statement transaction.
/*
Called for all storage handlers after ddl recovery is done
If the engine needs to do something on startup that requires a fully
functional server (like Spider creating system tables) - it should be
done here, not in init().
*/
int (*signal_ddl_recovery_done)(handlerton *hton);
/*
Server shutdown early notification.
If some parts of the engine need a fully functional server (like, InnoDB
purge thread) they need to be stopped now, not in deinit() or panic().
*/
void (*pre_shutdown)(void);
The calls to prepare_ordered() among multiple parallel transactions are
ordered consistently with calls to commit_ordered(). This means that
calls to prepare_ordered() effectively define the commit order, and that
each handler will see the same sequence of transactions calling into
prepare_ordered() and commit_ordered().
/* Called at startup to update default engine costs */
void (*update_optimizer_costs)(OPTIMIZER_COSTS *costs);
void *optimizer_costs; /* Costs are stored here */
/*
Notify the storage engine that the definition of the table (and the .frm
file) has changed. Returns 0 if ok.
*/
int (*notify_tabledef_changed)(handlerton *hton, LEX_CSTRING *db,
LEX_CSTRING *table_name, LEX_CUSTRING *frm,
LEX_CUSTRING *org_tabledef_version,
handler *file);
/*
Inform handler that partitioning engine has changed the .frm and the .par
files
*/
int (*create_partitioning_metadata)(const char *path, const char *old_path,
chf_create_flags action_flag);
Thus, prepare_ordered() can be used to define commit order for handlers
that need to do this in the prepare step (like binlog). It can also be
used to release transaction's locks early in an order consistent with the
order transactions will be eventually committed.
Like commit_ordered(), prepare_ordered() calls are serialised to maintain
ordering, so the intention is that they should execute fast, with only
the minimal amount of work needed to define commit order. Handlers can
rely on this serialisation, and do not need to do any extra locking to
avoid two prepare_ordered() calls running in parallel.
/**********************************************************************
Transaction handling
**********************************************************************/
/*
sv points to an uninitialized storage area of requested size
(see savepoint_offset description)
*/
int (*savepoint_set)(handlerton *hton, THD *thd, void *sv);
/*
sv points to a storage area, that was earlier passed
to the savepoint_set call
*/
int (*savepoint_rollback)(handlerton *hton, THD *thd, void *sv);
/**
Check if storage engine allows to release metadata locks which were
acquired after the savepoint if rollback to savepoint is done.
@return true - If it is safe to release MDL locks.
false - If it is not.
*/
bool (*savepoint_rollback_can_release_mdl)(handlerton *hton, THD *thd);
int (*savepoint_release)(handlerton *hton, THD *thd, void *sv);
/*
'all' is true if it's a real commit, that makes persistent changes
'all' is false if it's not in fact a commit but an end of the
statement that is part of the transaction.
NOTE 'all' is also false in auto-commit mode where 'end of statement'
and 'real commit' mean the same event.
*/
int (*commit)(handlerton *hton, THD *thd, bool all);
/*
The commit_ordered() method is called prior to the commit() method, after
the transaction manager has decided to commit (not rollback) the
transaction. Unlike commit(), commit_ordered() is called only when the
full transaction is committed, not for each commit of statement
transaction in a multi-statement transaction.
Like commit_ordered(), prepare_ordered() is not guaranteed to be called
in the context of the thread handling the rest of the transaction. So it
cannot invoke code that relies on thread local storage, in particular it
cannot call my_error().
Not that like prepare(), commit_ordered() is only called when 2-phase
commit takes place. Ie. when no binary log and only a single engine
participates in a transaction, one commit() is called, no
commit_ordered(). So engines must be prepared for this.
prepare_ordered() cannot cause a rollback by returning an error, all
possible errors must be handled in prepare() (the prepare_ordered()
method returns void). In case of some fatal error, a record of the error
must be made internally by the engine and returned from commit() later.
The calls to commit_ordered() in multiple parallel transactions is
guaranteed to happen in the same order in every participating
handler. This can be used to ensure the same commit order among multiple
handlers (eg. in table handler and binlog). So if transaction T1 calls
into commit_ordered() of handler A before T2, then T1 will also call
commit_ordered() of handler B before T2.
Note that for user-level XA SQL commands, no consistent ordering among
prepare_ordered() and commit_ordered() is guaranteed (as that would
require blocking all other commits for an indefinite time).
Engines that implement this method should during this call make the
transaction visible to other transactions, thereby making the order of
transaction commits be defined by the order of commit_ordered() calls.
When 2-phase commit is not used (eg. only one engine (and no binlog) in
transaction), neither prepare() nor prepare_ordered() is called.
*/
void (*prepare_ordered)(handlerton *hton, THD *thd, bool all);
int (*recover)(handlerton *hton, XID *xid_list, uint len);
int (*commit_by_xid)(handlerton *hton, XID *xid);
int (*rollback_by_xid)(handlerton *hton, XID *xid);
The intention is that commit_ordered() should do the minimal amount of
work that needs to happen in consistent commit order among handlers. To
preserve ordering, calls need to be serialised on a global mutex, so
doing any time-consuming or blocking operations in commit_ordered() will
limit scalability.
Handlers can rely on commit_ordered() calls to be serialised (no two
calls can run in parallel, so no extra locking on the handler part is
required to ensure this).
Note that commit_ordered() can be called from a different thread than the
one handling the transaction! So it can not do anything that depends on
thread local storage, in particular it can not call my_error() and
friends (instead it can store the error code and delay the call of
my_error() to the commit() method).
Similarly, since commit_ordered() returns void, any return error code
must be saved and returned from the commit() method instead.
The commit_ordered method is optional, and can be left unset if not
needed in a particular handler (then there will be no ordering guarantees
wrt. other engines and binary log).
*/
void (*commit_ordered)(handlerton *hton, THD *thd, bool all);
int (*rollback)(handlerton *hton, THD *thd, bool all);
int (*prepare)(handlerton *hton, THD *thd, bool all);
/*
The prepare_ordered method is optional. If set, it will be called after
successful prepare() in all handlers participating in 2-phase
commit. Like commit_ordered(), it is called only when the full
transaction is committed, not for each commit of statement transaction.
The calls to prepare_ordered() among multiple parallel transactions are
ordered consistently with calls to commit_ordered(). This means that
calls to prepare_ordered() effectively define the commit order, and that
each handler will see the same sequence of transactions calling into
prepare_ordered() and commit_ordered().
Thus, prepare_ordered() can be used to define commit order for handlers
that need to do this in the prepare step (like binlog). It can also be
used to release transaction's locks early in an order consistent with the
order transactions will be eventually committed.
Like commit_ordered(), prepare_ordered() calls are serialised to maintain
ordering, so the intention is that they should execute fast, with only
the minimal amount of work needed to define commit order. Handlers can
rely on this serialisation, and do not need to do any extra locking to
avoid two prepare_ordered() calls running in parallel.
Like commit_ordered(), prepare_ordered() is not guaranteed to be called
in the context of the thread handling the rest of the transaction. So it
cannot invoke code that relies on thread local storage, in particular it
cannot call my_error().
prepare_ordered() cannot cause a rollback by returning an error, all
possible errors must be handled in prepare() (the prepare_ordered()
method returns void). In case of some fatal error, a record of the error
must be made internally by the engine and returned from commit() later.
Note that for user-level XA SQL commands, no consistent ordering among
prepare_ordered() and commit_ordered() is guaranteed (as that would
require blocking all other commits for an indefinite time).
When 2-phase commit is not used (eg. only one engine (and no binlog) in
transaction), neither prepare() nor prepare_ordered() is called.
*/
void (*prepare_ordered)(handlerton *hton, THD *thd, bool all);
int (*recover)(handlerton *hton, XID *xid_list, uint len);
int (*commit_by_xid)(handlerton *hton, XID *xid);
int (*rollback_by_xid)(handlerton *hton, XID *xid);
/*
recover_rollback_by_xid is optional. If set, it will be called instead of
rollback_by_xid when transactions should be rolled back at server startup.
@ -1442,153 +1529,47 @@ struct handlerton
together to rollback prepared transactions asynchronously.
*/
void (*signal_tc_log_recovery_done)();
/*
The commit_checkpoint_request() handlerton method is used to checkpoint
the XA recovery process for storage engines that support two-phase
commit.
The method is optional - an engine that does not implemented is expected
to work the traditional way, where every commit() durably flushes the
transaction to disk in the engine before completion, so XA recovery will
no longer be needed for that transaction.
An engine that does implement commit_checkpoint_request() is also
expected to implement commit_ordered(), so that ordering of commits is
consistent between 2pc participants. Such engine is no longer required to
durably flush to disk transactions in commit(), provided that the
transaction has been successfully prepare()d and commit_ordered(); thus
potentionally saving one fsync() call. (Engine must still durably flush
to disk in commit() when no prepare()/commit_ordered() steps took place,
at least if durable commits are wanted; this happens eg. if binlog is
disabled).
The TC will periodically (eg. once per binlog rotation) call
commit_checkpoint_request(). When this happens, the engine must arrange
for all transaction that have completed commit_ordered() to be durably
flushed to disk (this does not include transactions that might be in the
middle of executing commit_ordered()). When such flush has completed, the
engine must call commit_checkpoint_notify_ha(), passing back the opaque
"cookie".
The flush and call of commit_checkpoint_notify_ha() need not happen
immediately - it can be scheduled and performed asynchronously (ie. as
part of next prepare(), or sync every second, or whatever), but should
not be postponed indefinitely. It is however also permissible to do it
immediately, before returning from commit_checkpoint_request().
When commit_checkpoint_notify_ha() is called, the TC will know that the
transactions are durably committed, and thus no longer require XA
recovery. It uses that to reduce the work needed for any subsequent XA
recovery process.
*/
void (*commit_checkpoint_request)(void *cookie);
/*
"Disable or enable checkpointing internal to the storage engine. This is
used for FLUSH TABLES WITH READ LOCK AND DISABLE CHECKPOINT to ensure that
the engine will never start any recovery from a time between
FLUSH TABLES ... ; UNLOCK TABLES.
The commit_checkpoint_request() handlerton method is used to checkpoint
the XA recovery process for storage engines that support two-phase
commit.
While checkpointing is disabled, the engine should pause any background
write activity (such as tablespace checkpointing) that require consistency
between different files (such as transaction log and tablespace files) for
crash recovery to succeed. The idea is to use this to make safe
multi-volume LVM snapshot backups.
The method is optional - an engine that does not implemented is expected
to work the traditional way, where every commit() durably flushes the
transaction to disk in the engine before completion, so XA recovery will
no longer be needed for that transaction.
An engine that does implement commit_checkpoint_request() is also
expected to implement commit_ordered(), so that ordering of commits is
consistent between 2pc participants. Such engine is no longer required to
durably flush to disk transactions in commit(), provided that the
transaction has been successfully prepare()d and commit_ordered(); thus
potentionally saving one fsync() call. (Engine must still durably flush
to disk in commit() when no prepare()/commit_ordered() steps took place,
at least if durable commits are wanted; this happens eg. if binlog is
disabled).
The TC will periodically (eg. once per binlog rotation) call
commit_checkpoint_request(). When this happens, the engine must arrange
for all transaction that have completed commit_ordered() to be durably
flushed to disk (this does not include transactions that might be in the
middle of executing commit_ordered()). When such flush has completed, the
engine must call commit_checkpoint_notify_ha(), passing back the opaque
"cookie".
The flush and call of commit_checkpoint_notify_ha() need not happen
immediately - it can be scheduled and performed asynchronously (ie. as
part of next prepare(), or sync every second, or whatever), but should
not be postponed indefinitely. It is however also permissible to do it
immediately, before returning from commit_checkpoint_request().
When commit_checkpoint_notify_ha() is called, the TC will know that the
transactions are durably committed, and thus no longer require XA
recovery. It uses that to reduce the work needed for any subsequent XA
recovery process.
*/
int (*checkpoint_state)(handlerton *hton, bool disabled);
void *(*create_cursor_read_view)(handlerton *hton, THD *thd);
void (*set_cursor_read_view)(handlerton *hton, THD *thd, void *read_view);
void (*close_cursor_read_view)(handlerton *hton, THD *thd, void *read_view);
handler *(*create)(handlerton *hton, TABLE_SHARE *table, MEM_ROOT *mem_root);
void (*drop_database)(handlerton *hton, char* path);
/*
return 0 if dropped successfully,
-1 if nothing was done by design (as in e.g. blackhole)
an error code (e.g. HA_ERR_NO_SUCH_TABLE) otherwise
*/
int (*drop_table)(handlerton *hton, const char* path);
int (*panic)(handlerton *hton, enum ha_panic_function flag);
int (*start_consistent_snapshot)(handlerton *hton, THD *thd);
bool (*flush_logs)(handlerton *hton);
bool (*show_status)(handlerton *hton, THD *thd, stat_print_fn *print, enum ha_stat_type stat);
uint (*partition_flags)();
alter_table_operations (*alter_table_flags)(alter_table_operations flags);
int (*fill_is_table)(handlerton *hton, THD *thd, TABLE_LIST *tables,
class Item *cond,
enum enum_schema_tables);
uint32 flags; /* global handler flags */
/*
Those handlerton functions below are properly initialized at handler
init.
*/
int (*binlog_func)(handlerton *hton, THD *thd, enum_binlog_func fn, void *arg);
void (*binlog_log_query)(handlerton *hton, THD *thd,
enum_binlog_command binlog_command,
const char *query, uint query_length,
const char *db, const char *table_name);
void (*abort_transaction)(handlerton *hton, THD *bf_thd, THD *victim_thd,
my_bool signal) __attribute__((nonnull));
int (*set_checkpoint)(handlerton *hton, const XID *xid);
int (*get_checkpoint)(handlerton *hton, XID* xid);
/**
Check if the version of the table matches the version in the .frm
file.
This is mainly used to verify in recovery to check if an inplace
ALTER TABLE succeded.
Storage engines that does not support inplace alter table does not
have to implement this function.
@param hton handlerton
@param path Path for table
@param version The unique id that is stored in the .frm file for
CREATE and updated for each ALTER TABLE (but not for
simple renames).
This is the ID used for the final table.
@param create_id The value returned from handler->table_version() for
the original table (before ALTER TABLE).
@retval 0 If id matches or table is newer than create_id (depending
on what version check the engine supports. This means that
The (inplace) alter table did succeed.
@retval # > 0 Alter table did not succeed.
Related to handler::discover_check_version().
*/
int (*check_version)(handlerton *hton, const char *path,
const LEX_CUSTRING *version, ulonglong create_id);
/* Called for all storage handlers after ddl recovery is done */
int (*signal_ddl_recovery_done)(handlerton *hton);
/* Called at startup to update default engine costs */
void (*update_optimizer_costs)(OPTIMIZER_COSTS *costs);
void *optimizer_costs; /* Costs are stored here */
/*
Optional clauses in the CREATE/ALTER TABLE
*/
ha_create_table_option *table_options; // table level options
ha_create_table_option *field_options; // these are specified per field
ha_create_table_option *index_options; // these are specified per index
/**
The list of extensions of files created for a single table in the
database directory (datadir/db_name/).
Used by open_table_error(), by the default rename_table and delete_table
handler methods, and by the default discovery implementation.
For engines that have more than one file name extensions (separate
metadata, index, and/or data files), the order of elements is relevant.
First element of engine file name extensions array should be metadata
file extention. This is implied by the open_table_error()
and the default discovery implementation.
Second element - data file extension. This is implied
assumed by REPAIR TABLE ... USE_FRM implementation.
*/
const char **tablefile_extensions; // by default - empty list
void (*commit_checkpoint_request)(void *cookie);
int (*start_consistent_snapshot)(handlerton *hton, THD *thd);
/**********************************************************************
Functions to intercept queries
@ -1626,132 +1607,147 @@ struct handlerton
the statement, return NULL
*/
select_handler *(*create_unit)(THD *thd, SELECT_LEX_UNIT *select_unit);
/*********************************************************************
Table discovery API.
It allows the server to "discover" tables that exist in the storage
engine, without user issuing an explicit CREATE TABLE statement.
**********************************************************************/
/*
This method is required for any engine that supports automatic table
discovery, there is no default implementation.
Given a TABLE_SHARE discover_table() fills it in with a correct table
structure using one of the TABLE_SHARE::init_from_* methods.
Returns HA_ERR_NO_SUCH_TABLE if the table did not exist in the engine,
zero if the table was discovered successfully, or any other
HA_ERR_* error code as appropriate if the table existed, but the
discovery failed.
*/
int (*discover_table)(handlerton *hton, THD* thd, TABLE_SHARE *share);
/*
The discover_table_names method tells the server
about all tables in the specified database that the engine
knows about. Tables (or file names of tables) are added to
the provided discovered_list collector object using
add_table() or add_file() methods.
*/
class discovered_list
{
public:
virtual bool add_table(const char *tname, size_t tlen) = 0;
virtual bool add_file(const char *fname) = 0;
protected: virtual ~discovered_list() = default;
};
/*
By default (if not implemented by the engine, but the discover_table() is
implemented) it will perform a file-based discovery:
- if tablefile_extensions[0] is not null, this will discovers all tables
with the tablefile_extensions[0] extension.
Returns 0 on success and 1 on error.
*/
int (*discover_table_names)(handlerton *hton, const LEX_CSTRING *db,
MY_DIR *dir,
discovered_list *result);
/*
This is a method that allows to server to check if a table exists without
an overhead of the complete discovery.
By default (if not implemented by the engine, but the discovery_table() is
implemented) it will try to perform a file-based discovery:
- if tablefile_extensions[0] is not null this will look for a file name
with the tablefile_extensions[0] extension.
- if tablefile_extensions[0] is null, this will resort to discover_table().
Note that resorting to discover_table() is slow and the engine
should probably implement its own discover_table_existence() method,
if its tablefile_extensions[0] is null.
Returns 1 if the table exists and 0 if it does not.
*/
int (*discover_table_existence)(handlerton *hton, const char *db,
const char *table_name);
/*
This is the assisted table discovery method. Unlike the fully
automatic discovery as above, here a user is expected to issue an
explicit CREATE TABLE with the appropriate table attributes to
"assist" the discovery of a table. But this "discovering" CREATE TABLE
statement will not specify the table structure - the engine discovers
it using this method. For example, FederatedX uses it in
CREATE TABLE t1 ENGINE=FEDERATED CONNECTION="mysql://foo/bar/t1";
Given a TABLE_SHARE discover_table_structure() fills it in with a correct
table structure using one of the TABLE_SHARE::init_from_* methods.
Assisted discovery works independently from the automatic discover.
An engine is allowed to support only assisted discovery and not
support automatic one. Or vice versa.
*/
int (*discover_table_structure)(handlerton *hton, THD* thd,
TABLE_SHARE *share, HA_CREATE_INFO *info);
/*********************************************************************
Table discovery API.
It allows the server to "discover" tables that exist in the storage
engine, without user issuing an explicit CREATE TABLE statement.
**********************************************************************/
/*
Notify the storage engine that the definition of the table (and the .frm
file) has changed. Returns 0 if ok.
This method is required for any engine that supports automatic table
discovery, there is no default implementation.
Given a TABLE_SHARE discover_table() fills it in with a correct table
structure using one of the TABLE_SHARE::init_from_* methods.
Returns HA_ERR_NO_SUCH_TABLE if the table did not exist in the engine,
zero if the table was discovered successfully, or any other
HA_ERR_* error code as appropriate if the table existed, but the
discovery failed.
*/
int (*notify_tabledef_changed)(handlerton *hton, LEX_CSTRING *db,
LEX_CSTRING *table_name, LEX_CUSTRING *frm,
LEX_CUSTRING *org_tabledef_version,
handler *file);
int (*discover_table)(handlerton *hton, THD* thd, TABLE_SHARE *share);
/*
System Versioning
/*
The discover_table_names method tells the server
about all tables in the specified database that the engine
knows about. Tables (or file names of tables) are added to
the provided discovered_list collector object using
add_table() or add_file() methods.
*/
class discovered_list
{
public:
virtual bool add_table(const char *tname, size_t tlen) = 0;
virtual bool add_file(const char *fname) = 0;
protected: virtual ~discovered_list() = default;
};
/*
By default (if not implemented by the engine, but the discover_table() is
implemented) it will perform a file-based discovery:
- if tablefile_extensions[0] is not null, this will discovers all tables
with the tablefile_extensions[0] extension.
Returns 0 on success and 1 on error.
*/
int (*discover_table_names)(handlerton *hton, const LEX_CSTRING *db,
MY_DIR *dir, discovered_list *result);
/*
This is a method that allows to server to check if a table exists without
an overhead of the complete discovery.
By default (if not implemented by the engine, but the discovery_table() is
implemented) it will try to perform a file-based discovery:
- if tablefile_extensions[0] is not null this will look for a file name
with the tablefile_extensions[0] extension.
- if tablefile_extensions[0] is null, this will resort to discover_table().
Note that resorting to discover_table() is slow and the engine
should probably implement its own discover_table_existence() method,
if its tablefile_extensions[0] is null.
Returns 1 if the table exists and 0 if it does not.
*/
int (*discover_table_existence)(handlerton *hton, const char *db,
const char *table_name);
/*
This is the assisted table discovery method. Unlike the fully
automatic discovery as above, here a user is expected to issue an
explicit CREATE TABLE with the appropriate table attributes to
"assist" the discovery of a table. But such "discovering" CREATE TABLE
statement must not specify the table structure - the engine discovers
it using this method. For example, FederatedX uses it in
CREATE TABLE t1 ENGINE=FEDERATED CONNECTION="mysql://foo/bar/t1";
Given a TABLE_SHARE discover_table_structure() fills it in with a correct
table structure using one of the TABLE_SHARE::init_from_* methods.
Assisted discovery works independently from the automatic discover.
An engine is allowed to support only assisted discovery and not
support automatic one. Or vice versa.
*/
int (*discover_table_structure)(handlerton *hton, THD* thd,
TABLE_SHARE *share, HA_CREATE_INFO *info);
/**
Check if the version of the table matches the version in the .frm
file.
This is mainly used to verify in recovery to check if an inplace
ALTER TABLE succeded.
Storage engines that does not support inplace alter table does not
have to implement this function.
@param hton handlerton
@param path Path for table
@param version The unique id that is stored in the .frm file for
CREATE and updated for each ALTER TABLE (but not for
simple renames).
This is the ID used for the final table.
@param create_id The value returned from handler->table_version() for
the original table (before ALTER TABLE).
@retval 0 If id matches or table is newer than create_id (depending
on what version check the engine supports. This means that
The (inplace) alter table did succeed.
@retval # > 0 Alter table did not succeed.
Related to handler::discover_check_version().
*/
/** Determine if system-versioned data was modified by the transaction.
@param[in,out] thd current session
@param[out] trx_id transaction start ID
@return transaction commit ID
@retval 0 if no system-versioned data was affected by the transaction */
ulonglong (*prepare_commit_versioned)(THD *thd, ulonglong *trx_id);
int (*check_version)(handlerton *hton, const char *path,
const LEX_CUSTRING *version, ulonglong create_id);
/** Disable or enable the internal writes of a storage engine */
void (*disable_internal_writes)(bool disable);
/*********************************************************************
System Versioning
**********************************************************************/
/** Determine if system-versioned data was modified by the transaction.
@param[in,out] thd current session
@param[out] trx_id transaction start ID
@return transaction commit ID
@retval 0 if no system-versioned data was affected by the transaction
*/
ulonglong (*prepare_commit_versioned)(THD *thd, ulonglong *trx_id);
/* backup */
/*********************************************************************
backup
**********************************************************************/
void (*prepare_for_backup)(void);
void (*end_backup)(void);
/* Server shutdown early notification.*/
void (*pre_shutdown)(void);
/*
Inform handler that partitioning engine has changed the .frm and the .par
files
*/
int (*create_partitioning_metadata)(const char *path,
const char *old_path,
chf_create_flags action_flag);
/**********************************************************************
WSREP specific
**********************************************************************/
void (*abort_transaction)(handlerton *hton, THD *bf_thd, THD *victim_thd,
my_bool signal) __attribute__((nonnull));
int (*set_checkpoint)(handlerton *hton, const XID *xid);
int (*get_checkpoint)(handlerton *hton, XID* xid);
};
@ -1855,7 +1851,7 @@ handlerton *ha_default_tmp_handlerton(THD *thd);
#define HTON_TRUNCATE_REQUIRES_EXCLUSIVE_USE (1 << 19)
/*
Used by mysql_inplace_alter_table() to decide if we should call
hton->notify_tabledef_changed() before commit (MyRocks) or after (InnoDB).
hton->notify_tabledef_changed() before commit (S3) or after (InnoDB).
*/
#define HTON_REQUIRES_NOTIFY_TABLEDEF_CHANGED_AFTER_COMMIT (1 << 20)
@ -4948,7 +4944,7 @@ public:
*) Update SQL-layer data-dictionary by installing .FRM file for the new version
of the table.
*) Inform the storage engine about this change by calling the
hton::notify_table_changed()
hton::notify_tabledef_changed()
*) Destroy the Alter_inplace_info and handler_ctx objects.
*/
@ -5638,7 +5634,6 @@ void ha_signal_ddl_recovery_done();
void ha_signal_tc_log_recovery_done();
bool ha_flush_logs();
void ha_drop_database(const char* path);
void ha_checkpoint_state(bool disable);
void ha_commit_checkpoint_request(void *cookie, void (*pre_hook)(void *));
int ha_create_table(THD *thd, const char *path, const char *db,
const char *table_name, HA_CREATE_INFO *create_info,

4
sql/lock.cc
View file

@ -1133,9 +1133,7 @@ void Global_read_lock::unlock_global_read_lock(THD *thd)
{
thd->global_disable_checkpoint= 0;
if (!--global_disable_checkpoint)
{
ha_checkpoint_state(0); // Enable checkpoints
}
ha_disable_internal_writes(0); // Enable checkpoints
}
thd->mdl_context.release_lock(m_mdl_global_read_lock);

2
sql/sql_reload.cc
View file

@ -678,6 +678,6 @@ static void disable_checkpoints(THD *thd)
{
thd->global_disable_checkpoint= 1;
if (!global_disable_checkpoint++)
ha_checkpoint_state(1); // Disable checkpoints
ha_disable_internal_writes(1); // Disable checkpoints
}
}

31
sql/sql_show.cc
View file

@ -9680,35 +9680,14 @@ bool get_schema_tables_result(JOIN *join,
DBUG_RETURN(result);
}
struct run_hton_fill_schema_table_args
{
TABLE_LIST *tables;
COND *cond;
};
static my_bool run_hton_fill_schema_table(THD *thd, plugin_ref plugin,
void *arg)
{
struct run_hton_fill_schema_table_args *args=
(run_hton_fill_schema_table_args *) arg;
handlerton *hton= plugin_hton(plugin);
if (hton->fill_is_table)
hton->fill_is_table(hton, thd, args->tables, args->cond,
get_schema_table_idx(args->tables->schema_table));
return false;
}
int hton_fill_schema_table(THD *thd, TABLE_LIST *tables, COND *cond)
{
DBUG_ENTER("hton_fill_schema_table");
struct run_hton_fill_schema_table_args args;
args.tables= tables;
args.cond= cond;
plugin_foreach(thd, run_hton_fill_schema_table,
MYSQL_STORAGE_ENGINE_PLUGIN, &args);
StringBuffer<STRING_BUFFER_USUAL_SIZE> str(system_charset_info);
str.append(INFORMATION_SCHEMA_NAME);
str.append('.');
str.append(tables->schema_table->table_name);
warn_deprecated<1107>(thd, str.c_ptr());
DBUG_RETURN(0);
}

5
storage/maria/ha_maria.cc
View file

@ -3674,10 +3674,9 @@ bool maria_flush_logs(handlerton *hton)
}
int maria_checkpoint_state(handlerton *hton, bool disabled)
void maria_checkpoint_state(bool disabled)
{
maria_checkpoint_disabled= (my_bool) disabled;
return 0;
}
@ -3903,7 +3902,7 @@ static int ha_maria_init(void *p)
maria_hton->tablefile_extensions= ha_maria_exts;
maria_hton->commit= maria_commit;
maria_hton->rollback= maria_rollback;
maria_hton->checkpoint_state= maria_checkpoint_state;
maria_hton->disable_internal_writes= maria_checkpoint_state;
maria_hton->flush_logs= maria_flush_logs;
maria_hton->show_status= maria_show_status;
maria_hton->prepare_for_backup= maria_prepare_for_backup;

2
storage/maria/ha_s3.cc
View file

@ -1072,7 +1072,7 @@ static int ha_s3_init(void *p)
s3_hton->tablefile_extensions= no_exts;
s3_hton->commit= 0;
s3_hton->rollback= 0;
s3_hton->checkpoint_state= 0;
s3_hton->disable_internal_writes= 0;
s3_hton->flush_logs= 0;
s3_hton->show_status= 0;
s3_hton->prepare_for_backup= 0;