/
handler.cc
8679 lines (7430 loc) · 296 KB
/
handler.cc
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/* Copyright (c) 2000, 2021, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
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, version 2.0, 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 */
/** @file sql/handler.cc
@brief
Implements functions in the handler interface that are shared between all
storage engines.
*/
#include "sql/handler.h"
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <algorithm>
#include <atomic>
#include <cmath>
#include <list>
#include <random> // std::uniform_real_distribution
#include <string>
#include <vector>
#include "keycache.h"
#include "libbinlogevents/include/binlog_event.h"
#include "m_ctype.h"
#include "m_string.h"
#include "my_bit.h" // my_count_bits
#include "my_bitmap.h" // MY_BITMAP
#include "my_check_opt.h"
#include "my_dbug.h"
#include "my_loglevel.h"
#include "my_macros.h"
#include "my_pointer_arithmetic.h"
#include "my_psi_config.h"
#include "my_sqlcommand.h"
#include "my_sys.h" // MEM_DEFINED_IF_ADDRESSABLE()
#include "myisam.h" // TT_FOR_UPGRADE
#include "mysql/components/services/bits/psi_bits.h"
#include "mysql/components/services/log_builtins.h"
#include "mysql/components/services/log_shared.h"
#include "mysql/plugin.h"
#include "mysql/psi/mysql_file.h"
#include "mysql/psi/mysql_mutex.h"
#include "mysql/psi/mysql_table.h"
#include "mysql/psi/mysql_transaction.h"
#include "mysql/psi/psi_table.h"
#include "mysql/service_mysql_alloc.h"
#include "mysql_com.h"
#include "mysql_version.h" // MYSQL_VERSION_ID
#include "mysqld_error.h"
#include "prealloced_array.h"
#include "sql/auth/auth_common.h" // check_readonly() and SUPER_ACL
#include "sql/binlog.h" // mysql_bin_log
#include "sql/check_stack.h"
#include "sql/clone_handler.h"
#include "sql/current_thd.h"
#include "sql/dd/cache/dictionary_client.h" // dd::cache::Dictionary_client
#include "sql/dd/dd.h" // dd::get_dictionary
#include "sql/dd/dictionary.h" // dd:acquire_shared_table_mdl
#include "sql/dd/types/table.h" // dd::Table
#include "sql/dd_table_share.h" // open_table_def
#include "sql/debug_sync.h" // DEBUG_SYNC
#include "sql/derror.h" // ER_DEFAULT
#include "sql/error_handler.h" // Internal_error_handler
#include "sql/field.h"
#include "sql/item.h"
#include "sql/lock.h" // MYSQL_LOCK
#include "sql/log.h"
#include "sql/log_event.h" // Write_rows_log_event
#include "sql/mdl.h"
#include "sql/mysqld.h" // global_system_variables heap_hton ..
#include "sql/opt_costconstantcache.h" // reload_optimizer_cost_constants
#include "sql/opt_costmodel.h"
#include "sql/opt_hints.h"
#include "sql/protocol.h"
#include "sql/psi_memory_key.h"
#include "sql/query_options.h"
#include "sql/record_buffer.h" // Record_buffer
#include "sql/rpl_filter.h"
#include "sql/rpl_gtid.h"
#include "sql/rpl_handler.h" // RUN_HOOK
#include "sql/rpl_replica_commit_order_manager.h" // Commit_order_manager
#include "sql/rpl_rli.h" // is_atomic_ddl_commit_on_slave
#include "sql/rpl_write_set_handler.h" // add_pke
#include "sql/sdi_utils.h" // import_serialized_meta_data
#include "sql/session_tracker.h"
#include "sql/sql_base.h" // free_io_cache
#include "sql/sql_bitmap.h"
#include "sql/sql_class.h"
#include "sql/sql_error.h"
#include "sql/sql_lex.h"
#include "sql/sql_parse.h" // check_stack_overrun
#include "sql/sql_plugin.h" // plugin_foreach
#include "sql/sql_select.h" // actual_key_parts
#include "sql/sql_table.h" // build_table_filename
#include "sql/strfunc.h" // strnncmp_nopads
#include "sql/system_variables.h"
#include "sql/table.h"
#include "sql/tc_log.h"
#include "sql/thr_malloc.h"
#include "sql/transaction.h" // trans_commit_implicit
#include "sql/transaction_info.h"
#include "sql/xa.h"
#include "sql_string.h"
#include "sql_tmp_table.h" // free_tmp_table
#include "template_utils.h"
#include "uniques.h" // Unique_on_insert
#include "varlen_sort.h"
/**
@def MYSQL_TABLE_IO_WAIT
Instrumentation helper for table io_waits.
Note that this helper is intended to be used from
within the handler class only, as it uses members
from @c handler
Performance schema events are instrumented as follows:
- in non batch mode, one event is generated per call
- in batch mode, the number of rows affected is saved
in @c m_psi_numrows, so that @c end_psi_batch_mode()
generates a single event for the batch.
@param OP the table operation to be performed
@param INDEX the table index used if any, or MAX_KEY.
@param RESULT the result of the table operation performed
@param PAYLOAD instrumented code to execute
@sa handler::end_psi_batch_mode.
*/
#ifdef HAVE_PSI_TABLE_INTERFACE
#define MYSQL_TABLE_IO_WAIT(OP, INDEX, RESULT, PAYLOAD) \
{ \
if (m_psi != NULL) { \
switch (m_psi_batch_mode) { \
case PSI_BATCH_MODE_NONE: { \
PSI_table_locker *sub_locker = NULL; \
PSI_table_locker_state reentrant_safe_state; \
reentrant_safe_state.m_thread = nullptr; \
reentrant_safe_state.m_wait = nullptr; \
sub_locker = PSI_TABLE_CALL(start_table_io_wait)( \
&reentrant_safe_state, m_psi, OP, INDEX, __FILE__, __LINE__); \
PAYLOAD \
if (sub_locker != NULL) PSI_TABLE_CALL(end_table_io_wait) \
(sub_locker, 1); \
break; \
} \
case PSI_BATCH_MODE_STARTING: { \
m_psi_locker = PSI_TABLE_CALL(start_table_io_wait)( \
&m_psi_locker_state, m_psi, OP, INDEX, __FILE__, __LINE__); \
PAYLOAD \
if (!RESULT) m_psi_numrows++; \
m_psi_batch_mode = PSI_BATCH_MODE_STARTED; \
break; \
} \
case PSI_BATCH_MODE_STARTED: \
default: { \
assert(m_psi_batch_mode == PSI_BATCH_MODE_STARTED); \
PAYLOAD \
if (!RESULT) m_psi_numrows++; \
break; \
} \
} \
} else { \
PAYLOAD \
} \
}
#else
#define MYSQL_TABLE_IO_WAIT(OP, INDEX, RESULT, PAYLOAD) PAYLOAD
#endif
/**
@def MYSQL_TABLE_LOCK_WAIT
Instrumentation helper for table io_waits.
@param OP the table operation to be performed
@param FLAGS per table operation flags.
@param PAYLOAD the code to instrument.
@sa MYSQL_END_TABLE_WAIT.
*/
#ifdef HAVE_PSI_TABLE_INTERFACE
#define MYSQL_TABLE_LOCK_WAIT(OP, FLAGS, PAYLOAD) \
{ \
if (m_psi != NULL) { \
PSI_table_locker *locker; \
PSI_table_locker_state state; \
locker = PSI_TABLE_CALL(start_table_lock_wait)(&state, m_psi, OP, FLAGS, \
__FILE__, __LINE__); \
PAYLOAD \
if (locker != NULL) PSI_TABLE_CALL(end_table_lock_wait)(locker); \
} else { \
PAYLOAD \
} \
}
#else
#define MYSQL_TABLE_LOCK_WAIT(OP, FLAGS, PAYLOAD) PAYLOAD
#endif
using std::list;
using std::log2;
using std::max;
using std::min;
/**
While we have legacy_db_type, we have this array to
check for dups and to find handlerton from legacy_db_type.
Remove when legacy_db_type is finally gone
*/
static Prealloced_array<st_plugin_int *, PREALLOC_NUM_HA> se_plugin_array(
PSI_NOT_INSTRUMENTED);
/**
Array allowing to check if handlerton is builtin without
acquiring LOCK_plugin.
*/
static Prealloced_array<bool, PREALLOC_NUM_HA> builtin_htons(
PSI_NOT_INSTRUMENTED);
st_plugin_int *hton2plugin(uint slot) { return se_plugin_array[slot]; }
size_t num_hton2plugins() { return se_plugin_array.size(); }
st_plugin_int *insert_hton2plugin(uint slot, st_plugin_int *plugin) {
if (se_plugin_array.assign_at(slot, plugin)) return nullptr;
builtin_htons.assign_at(slot, true);
return se_plugin_array[slot];
}
st_plugin_int *remove_hton2plugin(uint slot) {
st_plugin_int *retval = se_plugin_array[slot];
se_plugin_array[slot] = NULL;
builtin_htons.assign_at(slot, false);
return retval;
}
const char *ha_resolve_storage_engine_name(const handlerton *db_type) {
return db_type == nullptr ? "UNKNOWN" : hton2plugin(db_type->slot)->name.str;
}
static handlerton *installed_htons[128];
/* number of storage engines (from installed_htons[]) that support 2pc */
ulong total_ha_2pc = 0;
/* size of savepoint storage area (see ha_init) */
ulong savepoint_alloc_size = 0;
namespace {
struct Storage_engine_identifier {
const LEX_CSTRING canonical;
const LEX_CSTRING legacy;
};
const Storage_engine_identifier se_names[] = {
{{STRING_WITH_LEN("INNODB")}, {STRING_WITH_LEN("INNOBASE")}},
{{STRING_WITH_LEN("NDBCLUSTER")}, {STRING_WITH_LEN("NDB")}},
{{STRING_WITH_LEN("MEMORY")}, {STRING_WITH_LEN("HEAP")}},
{{STRING_WITH_LEN("MRG_MYISAM")}, {STRING_WITH_LEN("MERGE")}}};
const auto se_names_end = std::end(se_names);
std::vector<std::string> disabled_se_names;
} // namespace
const char *ha_row_type[] = {"",
"FIXED",
"DYNAMIC",
"COMPRESSED",
"REDUNDANT",
"COMPACT",
/* Reserved to be "PAGE" in future versions */ "?",
"?",
"?",
"?"};
const char *tx_isolation_names[] = {"READ-UNCOMMITTED", "READ-COMMITTED",
"REPEATABLE-READ", "SERIALIZABLE", NullS};
TYPELIB tx_isolation_typelib = {array_elements(tx_isolation_names) - 1, "",
tx_isolation_names, nullptr};
// Called for each SE to check if given db.table_name is a system table.
static bool check_engine_system_table_handlerton(THD *unused, plugin_ref plugin,
void *arg);
static int ha_discover(THD *thd, const char *db, const char *name,
uchar **frmblob, size_t *frmlen);
/**
Structure used by SE during check for system table.
This structure is passed to each SE handlerton and the status (OUT param)
is collected.
*/
struct st_sys_tbl_chk_params {
const char *db; // IN param
const char *table_name; // IN param
bool is_sql_layer_system_table; // IN param
legacy_db_type db_type; // IN param
enum enum_sys_tbl_chk_status {
// db.table_name is not a supported system table.
NOT_KNOWN_SYSTEM_TABLE,
/*
db.table_name is a system table,
but may not be supported by SE.
*/
KNOWN_SYSTEM_TABLE,
/*
db.table_name is a system table,
and is supported by SE.
*/
SUPPORTED_SYSTEM_TABLE
} status; // OUT param
};
static plugin_ref ha_default_plugin(THD *thd) {
if (thd->variables.table_plugin) return thd->variables.table_plugin;
return my_plugin_lock(thd, &global_system_variables.table_plugin);
}
/** @brief
Return the default storage engine handlerton used for non-temp tables
for thread
SYNOPSIS
ha_default_handlerton(thd)
thd current thread
RETURN
pointer to handlerton
*/
handlerton *ha_default_handlerton(THD *thd) {
plugin_ref plugin = ha_default_plugin(thd);
assert(plugin);
handlerton *hton = plugin_data<handlerton *>(plugin);
assert(hton);
return hton;
}
static plugin_ref ha_default_temp_plugin(THD *thd) {
if (thd->variables.temp_table_plugin) return thd->variables.temp_table_plugin;
return my_plugin_lock(thd, &global_system_variables.temp_table_plugin);
}
/** @brief
Return the default storage engine handlerton used for explicitly
created temp tables for a thread
SYNOPSIS
ha_default_temp_handlerton(thd)
thd current thread
RETURN
pointer to handlerton
*/
handlerton *ha_default_temp_handlerton(THD *thd) {
plugin_ref plugin = ha_default_temp_plugin(thd);
assert(plugin);
handlerton *hton = plugin_data<handlerton *>(plugin);
assert(hton);
return hton;
}
/**
Resolve handlerton plugin by name, without checking for "DEFAULT" or
HTON_NOT_USER_SELECTABLE.
@param thd Thread context.
@param name Plugin name.
@return plugin or NULL if not found.
*/
plugin_ref ha_resolve_by_name_raw(THD *thd, const LEX_CSTRING &name) {
return plugin_lock_by_name(thd, name, MYSQL_STORAGE_ENGINE_PLUGIN);
}
static const CHARSET_INFO &hton_charset() { return *system_charset_info; }
/**
Return the storage engine handlerton for the supplied name.
@param thd Current thread. May be nullptr, (e.g. during initialize).
@param name Name of storage engine.
@param is_temp_table true if table is a temporary table.
@return Pointer to storage engine plugin handle.
*/
plugin_ref ha_resolve_by_name(THD *thd, const LEX_CSTRING *name,
bool is_temp_table) {
if (thd && 0 == strnncmp_nopads(hton_charset(), *name,
{STRING_WITH_LEN("DEFAULT")})) {
return is_temp_table ? ha_default_plugin(thd) : ha_default_temp_plugin(thd);
}
// Note that thd CAN be nullptr here - it is not actually needed by
// ha_resolve_by_name_raw().
plugin_ref plugin = ha_resolve_by_name_raw(thd, *name);
if (plugin == nullptr) {
// If we fail to resolve the name passed in, we try to see if it is a
// historical alias.
auto match = std::find_if(
std::begin(se_names), se_names_end,
[&](const Storage_engine_identifier &sei) {
return (0 == strnncmp_nopads(hton_charset(), *name, sei.legacy));
});
if (match != se_names_end) {
// if it is, we resolve using the new name
plugin = ha_resolve_by_name_raw(thd, match->canonical);
}
}
if (plugin != nullptr) {
handlerton *hton = plugin_data<handlerton *>(plugin);
if (hton && !(hton->flags & HTON_NOT_USER_SELECTABLE)) return plugin;
/*
unlocking plugin immediately after locking is relatively low cost.
*/
plugin_unlock(thd, plugin);
}
return nullptr;
}
/**
Read a comma-separated list of storage engine names. Look up each in the
known list of canonical and legacy names. In case of a match; add both the
canonical and the legacy name to disabled_se_names, which is a static vector
of disabled storage engine names.
If there is no match, the unmodified name is added to the vector.
*/
void set_externally_disabled_storage_engine_names(const char *disabled_list) {
assert(disabled_list != nullptr);
myu::Split(
disabled_list, disabled_list + strlen(disabled_list), myu::IsComma,
[](const char *f, const char *l) {
auto tr = myu::FindTrimmedRange(f, l, myu::IsSpace);
if (tr.first == tr.second) return;
const LEX_CSTRING dse{tr.first,
static_cast<size_t>(tr.second - tr.first)};
auto match = std::find_if(
std::begin(se_names), se_names_end,
[&](const Storage_engine_identifier &seid) {
return (
(0 == strnncmp_nopads(hton_charset(), dse, seid.canonical)) ||
(0 == strnncmp_nopads(hton_charset(), dse, seid.legacy)));
});
if (match == se_names_end) {
disabled_se_names.emplace_back(dse.str, dse.length);
return;
}
disabled_se_names.emplace_back(match->canonical.str,
match->canonical.length);
disabled_se_names.emplace_back(match->legacy.str, match->legacy.length);
});
}
static bool is_storage_engine_name_externally_disabled(const char *name) {
const LEX_CSTRING n{name, strlen(name)};
return std::any_of(
disabled_se_names.begin(), disabled_se_names.end(),
[&](const std::string &dse) {
return (0 == strnncmp_nopads(hton_charset(), n,
{dse.c_str(), dse.length()}));
});
}
/**
Returns true if the storage engine of the handlerton argument has
been listed in the disabled_storage_engines system variable. @note
that the SE may still be internally enabled, that is
HaIsInternallyEnabled may return true.
*/
bool ha_is_externally_disabled(const handlerton &htnr) {
const char *se_name = ha_resolve_storage_engine_name(&htnr);
assert(se_name != nullptr);
return is_storage_engine_name_externally_disabled(se_name);
}
// Check if storage engine is disabled for table/tablespace creation.
bool ha_is_storage_engine_disabled(handlerton *se_handle) {
assert(se_handle != nullptr);
return ha_is_externally_disabled(*se_handle);
}
plugin_ref ha_lock_engine(THD *thd, const handlerton *hton) {
if (hton) {
st_plugin_int **plugin = &se_plugin_array[hton->slot];
#ifdef NDEBUG
/*
Take a shortcut for builtin engines -- return pointer to plugin
without acquiring LOCK_plugin mutex. This is safe safe since such
plugins are not deleted until shutdown and we don't do reference
counting in non-debug builds for them.
Since we have reference to handlerton on our hands, this method
can't be called concurrently to non-builtin handlerton initialization/
deinitialization. So it is safe to access builtin_htons[] without
additional locking.
*/
if (builtin_htons[hton->slot]) return *plugin;
return my_plugin_lock(thd, plugin);
#else
/*
We can't take shortcut in debug builds.
At least assert that builtin_htons[slot] is set correctly.
*/
assert(builtin_htons[hton->slot] == (plugin[0]->plugin_dl == nullptr));
return my_plugin_lock(thd, &plugin);
#endif
}
return nullptr;
}
handlerton *ha_resolve_by_legacy_type(THD *thd, enum legacy_db_type db_type) {
plugin_ref plugin;
switch (db_type) {
case DB_TYPE_DEFAULT:
return ha_default_handlerton(thd);
default:
if (db_type > DB_TYPE_UNKNOWN && db_type < DB_TYPE_DEFAULT &&
(plugin = ha_lock_engine(thd, installed_htons[db_type])))
return plugin_data<handlerton *>(plugin);
/* fall through */
case DB_TYPE_UNKNOWN:
return nullptr;
}
}
/**
Use other database handler if databasehandler is not compiled in.
*/
handlerton *ha_checktype(THD *thd, enum legacy_db_type database_type,
bool no_substitute, bool report_error) {
DBUG_TRACE;
handlerton *hton = ha_resolve_by_legacy_type(thd, database_type);
if (ha_storage_engine_is_enabled(hton)) return hton;
if (no_substitute) {
if (report_error) {
const char *engine_name = ha_resolve_storage_engine_name(hton);
my_error(ER_FEATURE_DISABLED, MYF(0), engine_name, engine_name);
}
return nullptr;
}
(void)RUN_HOOK(transaction, after_rollback, (thd, false));
switch (database_type) {
case DB_TYPE_MRG_ISAM:
return ha_resolve_by_legacy_type(thd, DB_TYPE_MRG_MYISAM);
default:
break;
}
return ha_default_handlerton(thd);
} /* ha_checktype */
/**
Create handler object for the table in the storage engine.
@param share TABLE_SHARE for the table, can be NULL if caller
didn't perform full-blown open of table definition.
@param partitioned Indicates whether table is partitioned.
@param alloc Memory root to be used for allocating handler object.
@param db_type Table's storage engine.
@note This function will try to use default storage engine if one which
was specified through db_type parameter is not available.
*/
handler *get_new_handler(TABLE_SHARE *share, bool partitioned, MEM_ROOT *alloc,
handlerton *db_type) {
handler *file;
DBUG_TRACE;
DBUG_PRINT("enter", ("alloc: %p", alloc));
if (db_type && db_type->state == SHOW_OPTION_YES && db_type->create) {
if ((file = db_type->create(db_type, share, partitioned, alloc)))
file->init();
return file;
}
/*
Try the default table type
Here the call to current_thd() is ok as we call this function a lot of
times but we enter this branch very seldom.
*/
return get_new_handler(share, partitioned, alloc,
ha_default_handlerton(current_thd));
}
static const char **handler_errmsgs;
static const char *get_handler_errmsg(int nr) {
return handler_errmsgs[nr - HA_ERR_FIRST];
}
/**
Register handler error messages for use with my_error().
@retval
0 OK
@retval
!=0 Error
*/
int ha_init_errors(void) {
#define SETMSG(nr, msg) handler_errmsgs[(nr)-HA_ERR_FIRST] = (msg)
/* Allocate a pointer array for the error message strings. */
/* Zerofill it to avoid uninitialized gaps. */
if (!(handler_errmsgs = static_cast<const char **>(my_malloc(
key_memory_errmsgs_handler, HA_ERR_ERRORS * sizeof(char *),
MYF(MY_WME | MY_ZEROFILL)))))
return 1;
/* Set the dedicated error messages. */
SETMSG(HA_ERR_KEY_NOT_FOUND, ER_DEFAULT(ER_KEY_NOT_FOUND));
SETMSG(HA_ERR_FOUND_DUPP_KEY, ER_DEFAULT(ER_DUP_KEY));
SETMSG(HA_ERR_RECORD_CHANGED, "Update wich is recoverable");
SETMSG(HA_ERR_WRONG_INDEX, "Wrong index given to function");
SETMSG(HA_ERR_CRASHED, ER_DEFAULT(ER_NOT_KEYFILE));
SETMSG(HA_ERR_WRONG_IN_RECORD, ER_DEFAULT(ER_CRASHED_ON_USAGE));
SETMSG(HA_ERR_OUT_OF_MEM, "Table handler out of memory");
SETMSG(HA_ERR_NOT_A_TABLE, "Incorrect file format '%.64s'");
SETMSG(HA_ERR_WRONG_COMMAND, "Command not supported");
SETMSG(HA_ERR_OLD_FILE, ER_DEFAULT(ER_OLD_KEYFILE));
SETMSG(HA_ERR_NO_ACTIVE_RECORD, "No record read in update");
SETMSG(HA_ERR_RECORD_DELETED, "Intern record deleted");
SETMSG(HA_ERR_RECORD_FILE_FULL, ER_DEFAULT(ER_RECORD_FILE_FULL));
SETMSG(HA_ERR_INDEX_FILE_FULL, "No more room in index file '%.64s'");
SETMSG(HA_ERR_END_OF_FILE, "End in next/prev/first/last");
SETMSG(HA_ERR_UNSUPPORTED, ER_DEFAULT(ER_ILLEGAL_HA));
SETMSG(HA_ERR_TOO_BIG_ROW, "Too big row");
SETMSG(HA_WRONG_CREATE_OPTION, "Wrong create option");
SETMSG(HA_ERR_FOUND_DUPP_UNIQUE, ER_DEFAULT(ER_DUP_UNIQUE));
SETMSG(HA_ERR_UNKNOWN_CHARSET, "Can't open charset");
SETMSG(HA_ERR_WRONG_MRG_TABLE_DEF, ER_DEFAULT(ER_WRONG_MRG_TABLE));
SETMSG(HA_ERR_CRASHED_ON_REPAIR, ER_DEFAULT(ER_CRASHED_ON_REPAIR));
SETMSG(HA_ERR_CRASHED_ON_USAGE, ER_DEFAULT(ER_CRASHED_ON_USAGE));
SETMSG(HA_ERR_LOCK_WAIT_TIMEOUT, ER_DEFAULT(ER_LOCK_WAIT_TIMEOUT));
SETMSG(HA_ERR_LOCK_TABLE_FULL, ER_DEFAULT(ER_LOCK_TABLE_FULL));
SETMSG(HA_ERR_READ_ONLY_TRANSACTION, ER_DEFAULT(ER_READ_ONLY_TRANSACTION));
SETMSG(HA_ERR_LOCK_DEADLOCK, ER_DEFAULT(ER_LOCK_DEADLOCK));
SETMSG(HA_ERR_CANNOT_ADD_FOREIGN, ER_DEFAULT(ER_CANNOT_ADD_FOREIGN));
SETMSG(HA_ERR_NO_REFERENCED_ROW, ER_DEFAULT(ER_NO_REFERENCED_ROW_2));
SETMSG(HA_ERR_ROW_IS_REFERENCED, ER_DEFAULT(ER_ROW_IS_REFERENCED_2));
SETMSG(HA_ERR_NO_SAVEPOINT, "No savepoint with that name");
SETMSG(HA_ERR_NON_UNIQUE_BLOCK_SIZE, "Non unique key block size");
SETMSG(HA_ERR_NO_SUCH_TABLE, "No such table: '%.64s'");
SETMSG(HA_ERR_TABLE_EXIST, ER_DEFAULT(ER_TABLE_EXISTS_ERROR));
SETMSG(HA_ERR_NO_CONNECTION, "Could not connect to storage engine");
SETMSG(HA_ERR_TABLE_DEF_CHANGED, ER_DEFAULT(ER_TABLE_DEF_CHANGED));
SETMSG(HA_ERR_FOREIGN_DUPLICATE_KEY,
"FK constraint would lead to duplicate key");
SETMSG(HA_ERR_TABLE_NEEDS_UPGRADE, ER_DEFAULT(ER_TABLE_NEEDS_UPGRADE));
SETMSG(HA_ERR_TABLE_READONLY, ER_DEFAULT(ER_OPEN_AS_READONLY));
SETMSG(HA_ERR_AUTOINC_READ_FAILED, ER_DEFAULT(ER_AUTOINC_READ_FAILED));
SETMSG(HA_ERR_AUTOINC_ERANGE, ER_DEFAULT(ER_WARN_DATA_OUT_OF_RANGE));
SETMSG(HA_ERR_TOO_MANY_CONCURRENT_TRXS,
ER_DEFAULT(ER_TOO_MANY_CONCURRENT_TRXS));
SETMSG(HA_ERR_INDEX_COL_TOO_LONG, ER_DEFAULT(ER_INDEX_COLUMN_TOO_LONG));
SETMSG(HA_ERR_INDEX_CORRUPT, ER_DEFAULT(ER_INDEX_CORRUPT));
SETMSG(HA_FTS_INVALID_DOCID, "Invalid InnoDB FTS Doc ID");
SETMSG(HA_ERR_TABLE_IN_FK_CHECK, ER_DEFAULT(ER_TABLE_IN_FK_CHECK));
SETMSG(HA_ERR_TABLESPACE_EXISTS, "Tablespace already exists");
SETMSG(HA_ERR_TABLESPACE_MISSING, ER_DEFAULT(ER_TABLESPACE_MISSING));
SETMSG(HA_ERR_FTS_EXCEED_RESULT_CACHE_LIMIT,
"FTS query exceeds result cache limit");
SETMSG(HA_ERR_TEMP_FILE_WRITE_FAILURE,
ER_DEFAULT(ER_TEMP_FILE_WRITE_FAILURE));
SETMSG(HA_ERR_INNODB_FORCED_RECOVERY, ER_DEFAULT(ER_INNODB_FORCED_RECOVERY));
SETMSG(HA_ERR_FTS_TOO_MANY_WORDS_IN_PHRASE,
"Too many words in a FTS phrase or proximity search");
SETMSG(HA_ERR_TABLE_CORRUPT, ER_DEFAULT(ER_TABLE_CORRUPT));
SETMSG(HA_ERR_TABLESPACE_MISSING, ER_DEFAULT(ER_TABLESPACE_MISSING));
SETMSG(HA_ERR_TABLESPACE_IS_NOT_EMPTY,
ER_DEFAULT(ER_TABLESPACE_IS_NOT_EMPTY));
SETMSG(HA_ERR_WRONG_FILE_NAME, ER_DEFAULT(ER_WRONG_FILE_NAME));
SETMSG(HA_ERR_NOT_ALLOWED_COMMAND, ER_DEFAULT(ER_NOT_ALLOWED_COMMAND));
SETMSG(HA_ERR_COMPUTE_FAILED, "Compute virtual column value failed");
SETMSG(HA_ERR_DISK_FULL_NOWAIT, ER_DEFAULT(ER_DISK_FULL_NOWAIT));
SETMSG(HA_ERR_NO_SESSION_TEMP, ER_DEFAULT(ER_NO_SESSION_TEMP));
SETMSG(HA_ERR_WRONG_TABLE_NAME, ER_DEFAULT(ER_WRONG_TABLE_NAME));
SETMSG(HA_ERR_TOO_LONG_PATH, ER_DEFAULT(ER_TABLE_NAME_CAUSES_TOO_LONG_PATH));
SETMSG(HA_ERR_FTS_TOO_MANY_NESTED_EXP,
"Too many nested sub-expressions in a full-text search");
/* Register the error messages for use with my_error(). */
return my_error_register(get_handler_errmsg, HA_ERR_FIRST, HA_ERR_LAST);
}
int ha_finalize_handlerton(st_plugin_int *plugin) {
handlerton *hton = (handlerton *)plugin->data;
DBUG_TRACE;
/* hton can be NULL here, if ha_initialize_handlerton() failed. */
if (!hton) goto end;
switch (hton->state) {
case SHOW_OPTION_NO:
case SHOW_OPTION_DISABLED:
break;
case SHOW_OPTION_YES:
if (installed_htons[hton->db_type] == hton)
installed_htons[hton->db_type] = nullptr;
break;
};
if (hton->panic) hton->panic(hton, HA_PANIC_CLOSE);
if (plugin->plugin->deinit) {
/*
Today we have no defined/special behavior for uninstalling
engine plugins.
*/
DBUG_PRINT("info", ("Deinitializing plugin: '%s'", plugin->name.str));
if (plugin->plugin->deinit(nullptr)) {
DBUG_PRINT("warning", ("Plugin '%s' deinit function returned error.",
plugin->name.str));
}
}
/*
In case a plugin is uninstalled and re-installed later, it should
reuse an array slot. Otherwise the number of uninstall/install
cycles would be limited.
*/
if (hton->slot != HA_SLOT_UNDEF) {
/* Make sure we are not unpluging another plugin */
assert(se_plugin_array[hton->slot] == plugin);
assert(hton->slot < se_plugin_array.size());
se_plugin_array[hton->slot] = NULL;
builtin_htons[hton->slot] = false; /* Extra correctness. */
}
my_free(hton);
plugin->data = nullptr;
end:
return 0;
}
int ha_initialize_handlerton(st_plugin_int *plugin) {
handlerton *hton;
DBUG_TRACE;
DBUG_PRINT("plugin", ("initialize plugin: '%s'", plugin->name.str));
hton = static_cast<handlerton *>(my_malloc(key_memory_handlerton_objects,
sizeof(handlerton),
MYF(MY_WME | MY_ZEROFILL)));
if (hton == nullptr) {
LogErr(ERROR_LEVEL, ER_HANDLERTON_OOM, plugin->name.str);
goto err_no_hton_memory;
}
hton->slot = HA_SLOT_UNDEF;
/* Historical Requirement */
plugin->data = hton; // shortcut for the future
if (plugin->plugin->init && plugin->plugin->init(hton)) {
LogErr(ERROR_LEVEL, ER_PLUGIN_INIT_FAILED, plugin->name.str);
goto err;
}
/*
the switch below and hton->state should be removed when
command-line options for plugins will be implemented
*/
DBUG_PRINT("info", ("hton->state=%d", hton->state));
switch (hton->state) {
case SHOW_OPTION_NO:
break;
case SHOW_OPTION_YES: {
uint tmp;
ulong fslot;
/* now check the db_type for conflict */
if (hton->db_type <= DB_TYPE_UNKNOWN ||
hton->db_type >= DB_TYPE_DEFAULT || installed_htons[hton->db_type]) {
int idx = (int)DB_TYPE_FIRST_DYNAMIC;
while (idx < (int)DB_TYPE_DEFAULT && installed_htons[idx]) idx++;
if (idx == (int)DB_TYPE_DEFAULT) {
LogErr(WARNING_LEVEL, ER_TOO_MANY_STORAGE_ENGINES);
goto err_deinit;
}
if (hton->db_type != DB_TYPE_UNKNOWN)
LogErr(WARNING_LEVEL, ER_SE_TYPECODE_CONFLICT, plugin->plugin->name,
idx);
hton->db_type = (enum legacy_db_type)idx;
}
/*
In case a plugin is uninstalled and re-installed later, it should
reuse an array slot. Otherwise the number of uninstall/install
cycles would be limited. So look for a free slot.
*/
DBUG_PRINT("plugin",
("total_ha: %lu", static_cast<ulong>(se_plugin_array.size())));
for (fslot = 0; fslot < se_plugin_array.size(); fslot++) {
if (!se_plugin_array[fslot]) break;
}
if (fslot < se_plugin_array.size())
hton->slot = fslot;
else {
hton->slot = se_plugin_array.size();
}
if (se_plugin_array.assign_at(hton->slot, plugin) ||
builtin_htons.assign_at(hton->slot, (plugin->plugin_dl == nullptr)))
goto err_deinit;
installed_htons[hton->db_type] = hton;
tmp = hton->savepoint_offset;
hton->savepoint_offset = savepoint_alloc_size;
savepoint_alloc_size += tmp;
if (hton->prepare) total_ha_2pc++;
break;
}
/* fall through */
default:
hton->state = SHOW_OPTION_DISABLED;
break;
}
/*
This is entirely for legacy. We will create a new "disk based" hton and a
"memory" hton which will be configurable longterm. We should be able to
remove partition and myisammrg.
*/
switch (hton->db_type) {
case DB_TYPE_HEAP:
heap_hton = hton;
break;
case DB_TYPE_TEMPTABLE:
temptable_hton = hton;
break;
case DB_TYPE_MYISAM:
myisam_hton = hton;
break;
case DB_TYPE_INNODB:
innodb_hton = hton;
break;
default:
break;
};
/*
Re-load the optimizer cost constants since this storage engine can
have non-default cost constants.
*/
reload_optimizer_cost_constants();
return 0;
err_deinit:
/*
Let plugin do its inner deinitialization as plugin->init()
was successfully called before.
*/
if (plugin->plugin->deinit) (void)plugin->plugin->deinit(nullptr);
err:
my_free(hton);
err_no_hton_memory:
plugin->data = nullptr;
return 1;
}
int ha_init() {
int error = 0;
DBUG_TRACE;
/*
Check if there is a transaction-capable storage engine besides the
binary log.
*/
opt_using_transactions =
se_plugin_array.size() > static_cast<ulong>(opt_bin_log);
savepoint_alloc_size += sizeof(SAVEPOINT);
return error;
}
void ha_end() {
// Unregister handler error messages.
my_error_unregister(HA_ERR_FIRST, HA_ERR_LAST);
my_free(handler_errmsgs);
}
static bool dropdb_handlerton(THD *, plugin_ref plugin, void *path) {
handlerton *hton = plugin_data<handlerton *>(plugin);
if (hton->state == SHOW_OPTION_YES && hton->drop_database)
hton->drop_database(hton, (char *)path);
return false;
}
void ha_drop_database(char *path) {
plugin_foreach(nullptr, dropdb_handlerton, MYSQL_STORAGE_ENGINE_PLUGIN, path);
}
static bool closecon_handlerton(THD *thd, plugin_ref plugin, void *) {
handlerton *hton = plugin_data<handlerton *>(plugin);
/*
there's no need to rollback here as all transactions must
be rolled back already
*/
if (hton->state == SHOW_OPTION_YES && thd_get_ha_data(thd, hton)) {
if (hton->close_connection) hton->close_connection(hton, thd);
/* make sure ha_data is reset and ha_data_lock is released */
thd_set_ha_data(thd, hton, nullptr);
}
return false;
}
/**
@note
don't bother to rollback here, it's done already
*/
void ha_close_connection(THD *thd) {
plugin_foreach(thd, closecon_handlerton, MYSQL_STORAGE_ENGINE_PLUGIN,
nullptr);
}
static bool kill_handlerton(THD *thd, plugin_ref plugin, void *) {
handlerton *hton = plugin_data<handlerton *>(plugin);
if (hton->state == SHOW_OPTION_YES && hton->kill_connection) {
if (thd_get_ha_data(thd, hton)) hton->kill_connection(hton, thd);
}
return false;
}
void ha_kill_connection(THD *thd) {
plugin_foreach(thd, kill_handlerton, MYSQL_STORAGE_ENGINE_PLUGIN, nullptr);
}
/** Invoke handlerton::pre_dd_shutdown() on a plugin.
@param plugin storage engine plugin
@retval false (always) */
static bool pre_dd_shutdown_handlerton(THD *, plugin_ref plugin, void *) {
handlerton *hton = plugin_data<handlerton *>(plugin);
if (hton->state == SHOW_OPTION_YES && hton->pre_dd_shutdown)
hton->pre_dd_shutdown(hton);
return false;
}
/** Invoke handlerton::pre_dd_shutdown() on every storage engine plugin. */
void ha_pre_dd_shutdown(void) {
plugin_foreach(nullptr, pre_dd_shutdown_handlerton,
MYSQL_STORAGE_ENGINE_PLUGIN, nullptr);
}
/* ========================================================================
======================= TRANSACTIONS ===================================*/
/**
Transaction handling in the server
==================================
In each client connection, MySQL maintains two transactional
states:
- a statement transaction,
- a standard, also called normal transaction.
Historical note
---------------
"Statement transaction" is a non-standard term that comes
from the times when MySQL supported BerkeleyDB storage engine.
First of all, it should be said that in BerkeleyDB auto-commit
mode auto-commits operations that are atomic to the storage
engine itself, such as a write of a record, and are too
high-granular to be atomic from the application perspective
(MySQL). One SQL statement could involve many BerkeleyDB
auto-committed operations and thus BerkeleyDB auto-commit was of
little use to MySQL.
Secondly, instead of SQL standard savepoints, BerkeleyDB
provided the concept of "nested transactions". In a nutshell,
transactions could be arbitrarily nested, but when the parent
transaction was committed or aborted, all its child (nested)
transactions were handled committed or aborted as well.
Commit of a nested transaction, in turn, made its changes
visible, but not durable: it destroyed the nested transaction,
all its changes would become available to the parent and
currently active nested transactions of this parent.