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/* Copyright (c) 2014, 2025, 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 designed to work 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 either included with
the program or referenced in the documentation.
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 */
#include "sql/dd/impl/bootstrap/bootstrapper.h"
#include <stddef.h>
#include <sys/types.h>
#include <memory>
#include <new>
#include <set>
#include <string>
#include <utility>
#include <vector>
#include "m_ctype.h"
#include "my_dbug.h"
#include "my_loglevel.h"
#include "my_sys.h"
#include "mysql/components/services/log_builtins.h"
#include "mysql_version.h" // MYSQL_VERSION_ID
#include "mysqld_error.h"
#include "sql/auth/sql_security_ctx.h"
#include "sql/dd/cache/dictionary_client.h" // dd::cache::Dictionary_client
#include "sql/dd/dd.h" // dd::create_object
#include "sql/dd/impl/bootstrap/bootstrap_ctx.h" // DD_bootstrap_ctx
#include "sql/dd/impl/cache/shared_dictionary_cache.h" // Shared_dictionary_cache
#include "sql/dd/impl/cache/storage_adapter.h" // Storage_adapter
#include "sql/dd/impl/dictionary_impl.h" // dd::Dictionary_impl
#include "sql/dd/impl/raw/object_keys.h"
#include "sql/dd/impl/sdi.h" // dd::sdi::store
#include "sql/dd/impl/tables/character_sets.h" // dd::tables::Character_sets
#include "sql/dd/impl/tables/collations.h" // dd::tables::Collations
#include "sql/dd/impl/tables/dd_properties.h" // dd::tables::DD_properties
#include "sql/dd/impl/tables/tables.h" // dd::tables::Tables
#include "sql/dd/impl/types/schema_impl.h" // dd::Schema_impl
#include "sql/dd/impl/types/table_impl.h" // dd::Table_impl
#include "sql/dd/impl/types/tablespace_impl.h" // dd::Table_impl
#include "sql/dd/impl/upgrade/dd.h" // dd::upgrade::upgrade_tables
#include "sql/dd/impl/upgrade/server.h" // dd::upgrade::do_server_upgrade_checks
#include "sql/dd/impl/utils.h" // dd::execute_query
#include "sql/dd/info_schema/metadata.h" // IS_DD_VERSION
#include "sql/dd/object_id.h"
#include "sql/dd/types/abstract_table.h"
#include "sql/dd/types/object_table.h" // dd::Object_table
#include "sql/dd/types/object_table_definition.h" // dd::Object_table_definition
#include "sql/dd/types/table.h"
#include "sql/dd/types/tablespace.h"
#include "sql/dd/types/tablespace_file.h" // dd::Tablespace_file
#include "sql/dd/upgrade/server.h" // UPGRADE_NONE
#include "sql/dd/upgrade_57/upgrade.h" // upgrade_57::Upgrade_status
#include "sql/handler.h" // dict_init_mode_t
#include "sql/mdl.h"
#include "sql/mysqld.h"
#include "sql/sd_notify.h" // sysd::notify
#include "sql/thd_raii.h"
#include "storage/perfschema/pfs_dd_version.h" // PFS_DD_VERSION
using namespace dd;
///////////////////////////////////////////////////////////////////////////
namespace {
// Initialize recovery in the DDSE.
bool DDSE_dict_recover(THD *thd, dict_recovery_mode_t dict_recovery_mode,
uint version) {
handlerton *ddse = ha_resolve_by_legacy_type(thd, DB_TYPE_INNODB);
if (ddse->dict_recover == nullptr) return true;
bool error = ddse->dict_recover(dict_recovery_mode, version);
/*
Commit when tablespaces have been initialized, since in that
case, tablespace meta data is added.
*/
if (dict_recovery_mode == DICT_RECOVERY_INITIALIZE_TABLESPACES)
return dd::end_transaction(thd, error);
return error;
}
/*
Update the System_tables registry with meta data from 'dd_properties'.
Iterate over the tables in the DD_properties. If this is minor downgrade,
add new tables that were added in the newer version to the System_tables
registry. If this is not minor downgrade, assert that all tables in the
DD_properties indeed have a corresponding entry in the System_tables
registry.
*/
bool update_system_tables(THD *thd) {
std::unique_ptr<dd::Properties> system_tables_props;
bool exists = false;
if (dd::tables::DD_properties::instance().get(
thd, "SYSTEM_TABLES", &system_tables_props, &exists) ||
!exists) {
my_error(ER_DD_INIT_FAILED, MYF(0));
return true;
}
/*
We would normally use a range based loop here, but the developerstudio
compiler on Solaris does not handle this when the base collection has
pure virtual begin() and end() functions.
*/
for (Properties::const_iterator it = system_tables_props->begin();
it != system_tables_props->end(); ++it) {
// Check if this is a CORE, INERT, SECOND or DDSE table.
if (!dd::get_dictionary()->is_dd_table_name(MYSQL_SCHEMA_NAME.str,
it->first)) {
if (bootstrap::DD_bootstrap_ctx::instance().is_minor_downgrade()) {
/*
Add tables as type CORE regardless of the actual type, which
is irrelevant in this case.
*/
System_tables::instance()->add(MYSQL_SCHEMA_NAME.str, it->first,
System_tables::Types::CORE, nullptr);
} else {
my_error(ER_DD_METADATA_NOT_FOUND, MYF(0), it->first.c_str());
return true;
}
} else {
/*
The table is a known DD table. Then, we get its definition
and add it to the Object_table instance. The definition might
not exist if the table was added after the version that we
are upgrading from.
*/
String_type tbl_prop_str;
if (!system_tables_props->exists(it->first) ||
system_tables_props->get(it->first, &tbl_prop_str))
continue;
const Object_table *table_def = System_tables::instance()->find_table(
MYSQL_SCHEMA_NAME.str, it->first);
assert(table_def);
std::unique_ptr<dd::Properties> tbl_props(
Properties::parse_properties(tbl_prop_str));
String_type def;
if (tbl_props->get(dd::tables::DD_properties::dd_key(
dd::tables::DD_properties::DD_property::DEF),
&def)) {
my_error(ER_DD_METADATA_NOT_FOUND, MYF(0), it->first.c_str());
return true;
}
std::unique_ptr<Properties> table_def_properties(
Properties::parse_properties(def));
table_def->set_actual_table_definition(*table_def_properties);
}
}
return false;
}
// Create a DD table using the target table definition.
bool create_target_table(THD *thd, const Object_table *object_table) {
assert(object_table != nullptr);
/*
The target table definition may not be present if the table
is abandoned. That's ok, not an error.
*/
if (object_table->is_abandoned()) return false;
String_type target_ddl_statement("");
const Object_table_definition *target_table_def =
object_table->target_table_definition();
assert(target_table_def != nullptr);
target_ddl_statement = target_table_def->get_ddl();
assert(!target_ddl_statement.empty());
return dd::execute_query(thd, target_ddl_statement);
}
// Create a DD table using the actual table definition.
/* purecov: begin inspected */
bool create_actual_table(THD *thd, const Object_table *object_table) {
/*
For minor downgrade, tables might have been added in the upgraded
server that we do not have any Object_table instance for. In that
case, we just skip them.
*/
if (object_table == nullptr) {
assert(bootstrap::DD_bootstrap_ctx::instance().is_minor_downgrade());
return false;
}
String_type actual_ddl_statement("");
const Object_table_definition *actual_table_def =
object_table->actual_table_definition();
/*
The actual definition may not be present. This will happen during
upgrade if the new DD version adds a new DD table which was not
present in the DD we are upgrading from. This is OK, not an error.
*/
if (actual_table_def == nullptr) return false;
actual_ddl_statement = actual_table_def->get_ddl();
assert(!actual_ddl_statement.empty());
return dd::execute_query(thd, actual_ddl_statement);
}
/* purecov: end */
/*
Acquire exclusive meta data locks for the DD schema, tablespace and
table names.
*/
bool acquire_exclusive_mdl(THD *thd) {
// All MDL requests.
MDL_request_list mdl_requests;
// Prepare MDL request for the schema name.
MDL_request schema_request;
MDL_REQUEST_INIT(&schema_request, MDL_key::SCHEMA, MYSQL_SCHEMA_NAME.str, "",
MDL_EXCLUSIVE, MDL_TRANSACTION);
mdl_requests.push_front(&schema_request);
// Prepare MDL request for the tablespace name.
MDL_request tablespace_request;
MDL_REQUEST_INIT(&tablespace_request, MDL_key::TABLESPACE, "",
MYSQL_TABLESPACE_NAME.str, MDL_EXCLUSIVE, MDL_TRANSACTION);
mdl_requests.push_front(&tablespace_request);
// Prepare MDL requests for all tables names.
for (System_tables::Const_iterator it = System_tables::instance()->begin();
it != System_tables::instance()->end(); ++it) {
// Skip extraneous tables during minor downgrade.
if ((*it)->entity() == nullptr) continue;
MDL_request *table_request = new (thd->mem_root) MDL_request;
if (table_request == nullptr) return true;
MDL_REQUEST_INIT(table_request, MDL_key::TABLE, MYSQL_SCHEMA_NAME.str,
(*it)->entity()->name().c_str(), MDL_EXCLUSIVE,
MDL_TRANSACTION);
mdl_requests.push_front(table_request);
}
// Finally, acquire all the MDL locks.
return (thd->mdl_context.acquire_locks(&mdl_requests,
thd->variables.lock_wait_timeout));
}
/*
Acquire the DD schema, tablespace and table objects. Clone the objects,
reset ID, store persistently, and update the storage adapter.
*/
bool flush_meta_data(THD *thd) {
// Acquire exclusive meta data locks for the relevant DD objects.
if (acquire_exclusive_mdl(thd)) return true;
{
/*
Use a scoped auto releaser to make sure the cached objects are released
before the shared cache is reset.
*/
dd::cache::Dictionary_client::Auto_releaser releaser(thd->dd_client());
/*
First, we acquire the DD schema and tablespace and keep them in
local variables. We also clone them, the clones will be used for
updating the ids. We also acquire all the DD table objects to make
sure the shared cache is populated, and we keep the original objects
as well as clones in a vector. The auto releaser will make sure the
objects are not evicted. This must be ensured since we need to make
sure the ids stay consistent across all objects in the shared cache.
*/
const Schema *dd_schema = nullptr;
const Tablespace *dd_tspace = nullptr;
std::vector<const Table_impl *> dd_tables; // Owned by the shared cache.
std::vector<std::unique_ptr<Table_impl>> dd_table_clones;
if (thd->dd_client()->acquire(dd::String_type(MYSQL_SCHEMA_NAME.str),
&dd_schema) ||
thd->dd_client()->acquire(dd::String_type(MYSQL_TABLESPACE_NAME.str),
&dd_tspace))
return dd::end_transaction(thd, true);
std::unique_ptr<Schema_impl> dd_schema_clone(
dynamic_cast<Schema_impl *>(dd_schema->clone()));
std::unique_ptr<Tablespace_impl> dd_tspace_clone(
dynamic_cast<Tablespace_impl *>(dd_tspace->clone()));
for (System_tables::Const_iterator it = System_tables::instance()->begin();
it != System_tables::instance()->end(); ++it) {
/*
We add nullptr to the dd_tables vector for abandoned
tables and system tables to have the same number of objects
in the System_tables list, the dd_tables vector and the
dd_table_clones vector.
*/
const dd::Table *dd_table = nullptr;
if ((*it)->property() != System_tables::Types::SYSTEM &&
thd->dd_client()->acquire(MYSQL_SCHEMA_NAME.str,
(*it)->entity()->name(), &dd_table))
return dd::end_transaction(thd, true);
dd_tables.push_back(dynamic_cast<const Table_impl *>(dd_table));
/*
If this is an abandoned table, we can't clone it. Thus, we
push back a nullptr to make sure we have the same number of
elements in the dd_table_clones as in the System_tables.
*/
std::unique_ptr<Table_impl> dd_table_clone;
if (dd_table != nullptr) {
dd_table_clones.push_back(std::unique_ptr<Table_impl>(
dynamic_cast<Table_impl *>(dd_table->clone())));
} else {
dd_table_clones.push_back(nullptr);
}
}
/*
We have now populated the shared cache with the core objects, and kept
clones of all DD objects. The scoped auto releaser makes sure we will
not evict the objects from the shared cache until the auto releaser
exits scope. Thus, within the scope of the auto releaser, we can modify
the contents of the core registry in the storage adapter without risking
that this will interfere with the contents of the shared cache, because
the DD transactions will acquire the core objects from the shared cache.
*/
/*
First, we modify and store the DD schema without changing the cached
copy. We cannot use acquire_for_modification() here, because that
would make the DD sub-transactions (e.g. when calling store()) see a
partially modified set of core objects, where e.g. the mysql
schema object has got its new, real id (from the auto-inc column
in the dd.schemata table), whereas the core DD table objects still
refer to the id that was allocated when creating the scaffolding.
So we first store all the objects persistently, and make sure that
the on-disk data will have correct and consistent ids. When all objects
are stored, we update the contents of the core registry in the
storage adapter to reflect the persisted data. Finally, the shared
cache is reset so that on next acquisition, the DD objects will be
fetched from the core registry in the storage adapter.
*/
/*
We must set the ID to INVALID to make the object get a fresh ID from
the auto inc ID column.
*/
dd_schema_clone->set_id(INVALID_OBJECT_ID);
dd_tspace_clone->set_id(INVALID_OBJECT_ID);
if (dd::cache::Storage_adapter::instance()->store(
thd, static_cast<Schema *>(dd_schema_clone.get())) ||
dd::cache::Storage_adapter::instance()->store(
thd, static_cast<Tablespace *>(dd_tspace_clone.get())))
return dd::end_transaction(thd, true);
/*
Now, the DD schema and DD tablespace are stored persistently. We will
not update the core registry until after we have stored all DD tables.
At that point, we can update all the core registry objects in one go
and avoid using a partially update core registry for e.g. object
acquisition.
*/
std::vector<std::unique_ptr<Table_impl>>::iterator clone_it =
dd_table_clones.begin();
for (System_tables::Const_iterator it = System_tables::instance()->begin();
it != System_tables::instance()->end() &&
clone_it != dd_table_clones.end();
++it, ++clone_it) {
// Skip abandoned tables and system tables.
if ((*clone_it) == nullptr ||
(*it)->property() == System_tables::Types::SYSTEM)
continue;
assert((*it)->entity()->name() == (*clone_it)->name());
// We must set the ID to INVALID to let the object get an auto inc ID.
(*clone_it)->set_id(INVALID_OBJECT_ID);
/*
Change the schema and tablespace id to match the ids of the
persisted objects. Note that this means the persisted DD table
objects will have consistent IDs, but the IDs in the objects in
the core registry will not be updated yet.
*/
(*clone_it)->set_schema_id(dd_schema_clone->id());
(*clone_it)->set_tablespace_id(dd_tspace_clone->id());
if (dd::cache::Storage_adapter::instance()->store(
thd, static_cast<Table *>((*clone_it).get())))
return dd::end_transaction(thd, true);
}
/*
Update and store the predefined tablespace objects. The DD tablespace
has already been stored above, so we iterate only over the tablespaces
of type PREDEFINED_DDSE.
*/
for (System_tablespaces::Const_iterator it =
System_tablespaces::instance()->begin(
System_tablespaces::Types::PREDEFINED_DDSE);
it != System_tablespaces::instance()->end();
it = System_tablespaces::instance()->next(
it, System_tablespaces::Types::PREDEFINED_DDSE)) {
const dd::Tablespace *tspace = nullptr;
if (thd->dd_client()->acquire((*it)->key().second, &tspace))
return dd::end_transaction(thd, true);
std::unique_ptr<Tablespace_impl> tspace_clone(
dynamic_cast<Tablespace_impl *>(tspace->clone()));
// We must set the ID to INVALID to enable storing the object.
tspace_clone->set_id(INVALID_OBJECT_ID);
if (dd::cache::Storage_adapter::instance()->store(
thd, static_cast<Tablespace *>(tspace_clone.get())))
return dd::end_transaction(thd, true);
/*
Only the DD tablespace is needed to handle cache misses, so we can
just drop the predefined tablespaces from the core registry now that
it has been persisted.
*/
dd::cache::Storage_adapter::instance()->core_drop(thd, tspace);
}
/*
Now, the DD schema and tablespace as well as the DD tables have been
persisted. The last thing we do before resetting the shared cache is
to update the contents of the core registry to match the persisted
objects. First, we update the core registry with the persisted DD
schema and tablespace.
*/
dd::cache::Storage_adapter::instance()->core_drop(thd, dd_schema);
dd::cache::Storage_adapter::instance()->core_store(
thd, static_cast<Schema *>(dd_schema_clone.get()));
dd::cache::Storage_adapter::instance()->core_drop(thd, dd_tspace);
dd::cache::Storage_adapter::instance()->core_store(
thd, static_cast<Tablespace *>(dd_tspace_clone.get()));
// Make sure the IDs after storing are as expected.
assert(dd_schema_clone->id() == 1);
assert(dd_tspace_clone->id() == 1);
/*
Finally, we update the core registry of the DD tables. This must be
done in two loops to avoid issues related to overlapping ID sequences.
*/
std::vector<const Table_impl *>::const_iterator table_it =
dd_tables.begin();
for (System_tables::Const_iterator it = System_tables::instance()->begin();
it != System_tables::instance()->end() && table_it != dd_tables.end();
++it, ++table_it) {
// Skip abandoned tables and system tables.
if ((*table_it) == nullptr ||
(*it)->property() == System_tables::Types::SYSTEM)
continue;
assert((*it)->entity()->name() == (*table_it)->name());
dd::cache::Storage_adapter::instance()->core_drop(
thd, static_cast<const Table *>(*table_it));
}
clone_it = dd_table_clones.begin();
for (System_tables::Const_iterator it = System_tables::instance()->begin();
it != System_tables::instance()->end() &&
clone_it != dd_table_clones.end();
++it, ++clone_it) {
// Skip abandoned tables and system tables.
if ((*clone_it) == nullptr ||
(*it)->property() == System_tables::Types::SYSTEM)
continue;
if ((*it)->property() == System_tables::Types::CORE) {
assert((*it)->entity()->name() == (*clone_it)->name());
dd::cache::Storage_adapter::instance()->core_store(
thd, static_cast<Table *>((*clone_it).get()));
}
}
}
/*
Now, the auto releaser has released the objects, and we can go ahead and
reset the shared cache.
*/
dd::cache::Shared_dictionary_cache::instance()->reset(true);
if (dd::end_transaction(thd, false)) {
return true;
}
/*
Use a scoped auto releaser to make sure the objects cached for SDI
writing, FK parent information reload, and DD property storage are
released.
*/
dd::cache::Dictionary_client::Auto_releaser releaser(thd->dd_client());
// Acquire the DD tablespace and write SDI
const Tablespace *dd_tspace = nullptr;
if (thd->dd_client()->acquire(dd::String_type(MYSQL_TABLESPACE_NAME.str),
&dd_tspace) ||
dd::sdi::store(thd, dd_tspace)) {
return dd::end_transaction(thd, true);
}
// Acquire the DD schema and write SDI
const Schema *dd_schema = nullptr;
if (thd->dd_client()->acquire(dd::String_type(MYSQL_SCHEMA_NAME.str),
&dd_schema) ||
dd::sdi::store(thd, dd_schema)) {
return dd::end_transaction(thd, true);
}
/*
Acquire the DD table objects and write SDI for them. Also sync from
the DD tables in order to get the FK parent information reloaded.
*/
for (System_tables::Const_iterator it = System_tables::instance()->begin();
it != System_tables::instance()->end(); ++it) {
// Skip system tables.
if ((*it)->property() == System_tables::Types::SYSTEM) continue;
const dd::Table *dd_table = nullptr;
if (thd->dd_client()->acquire(MYSQL_SCHEMA_NAME.str,
(*it)->entity()->name(), &dd_table)) {
return dd::end_transaction(thd, true);
}
// Skip abandoned tables.
if (dd_table == nullptr) continue;
/*
Make sure the registry of the core DD objects is updated with an
object read from the DD tables, with updated FK parent information.
Store the object to make sure SDI is written.
*/
Abstract_table::Name_key table_key;
Abstract_table::update_name_key(&table_key, dd_schema->id(),
dd_table->name());
const dd::Abstract_table *persisted_dd_table = nullptr;
if (dd::cache::Storage_adapter::instance()->get(
thd, table_key, ISO_READ_COMMITTED, true, &persisted_dd_table) ||
persisted_dd_table == nullptr ||
dd::sdi::store(thd, dynamic_cast<const Table *>(persisted_dd_table))) {
if (persisted_dd_table != nullptr) delete persisted_dd_table;
return dd::end_transaction(thd, true);
}
if ((*it)->property() == System_tables::Types::CORE) {
dd::cache::Storage_adapter::instance()->core_drop(thd, dd_table);
dd::cache::Storage_adapter::instance()->core_store(
thd, dynamic_cast<Table *>(
const_cast<Abstract_table *>(persisted_dd_table)));
}
if (persisted_dd_table != nullptr) delete persisted_dd_table;
}
bootstrap::DD_bootstrap_ctx::instance().set_stage(bootstrap::Stage::SYNCED);
return dd::end_transaction(thd, false);
}
// Insert additional data into the DD tables.
bool populate_tables(THD *thd) {
// Iterate over DD tables, populate tables.
for (System_tables::Const_iterator it = System_tables::instance()->begin();
it != System_tables::instance()->end(); ++it) {
// Skip system tables.
if ((*it)->property() == System_tables::Types::SYSTEM) continue;
// Retrieve list of SQL statements to execute.
const Object_table_definition *table_def =
(*it)->entity()->target_table_definition();
// Skip abandoned tables.
if (table_def == nullptr) continue;
bool error = false;
std::vector<dd::String_type> stmt = table_def->get_dml();
for (std::vector<dd::String_type>::iterator stmt_it = stmt.begin();
stmt_it != stmt.end() && !error; ++stmt_it)
error = dd::execute_query(thd, *stmt_it);
// Commit the statement based population.
if (dd::end_transaction(thd, error)) return true;
// If no error, call the low level table population method, and commit it.
error = (*it)->entity()->populate(thd);
if (dd::end_transaction(thd, error)) return true;
}
bootstrap::DD_bootstrap_ctx::instance().set_stage(
bootstrap::Stage::POPULATED);
return false;
}
// Re-populate character sets and collations upon normal restart.
bool repopulate_charsets_and_collations(THD *thd) {
/*
We must check if the DDSE is started in a way that makes the DD
read only. For now, we only support InnoDB as SE for the DD. The call
to retrieve the handlerton for the DDSE should be replaced by a more
generic mechanism.
*/
handlerton *ddse = ha_resolve_by_legacy_type(thd, DB_TYPE_INNODB);
if (ddse->is_dict_readonly && ddse->is_dict_readonly()) {
LogErr(WARNING_LEVEL, ER_DD_NO_WRITES_NO_REPOPULATION, "InnoDB", " ");
return false;
}
/*
Otherwise, turn off FK checks, re-populate and commit.
The FK checks must be turned off since the collations and
character sets reference each other.
*/
bool error = dd::execute_query(thd, "SET FOREIGN_KEY_CHECKS= 0") ||
tables::Collations::instance().populate(thd) ||
tables::Character_sets::instance().populate(thd);
/*
We must commit the re-population before executing a new query, which
expects the transaction to be empty, and finally, turn FK checks back on.
*/
error |= dd::end_transaction(thd, error);
error |= dd::execute_query(thd, "SET FOREIGN_KEY_CHECKS= 1");
bootstrap::DD_bootstrap_ctx::instance().set_stage(
bootstrap::Stage::POPULATED);
return error;
}
/*
Verify that the storage adapter contains the core DD objects and
nothing else.
*/
bool verify_contents(THD *thd) {
// Verify that the DD schema is present, and that its id == 1.
Schema::Name_key schema_key;
Schema::update_name_key(&schema_key, MYSQL_SCHEMA_NAME.str);
Object_id dd_schema_id =
cache::Storage_adapter::instance()->core_get_id<Schema>(schema_key);
assert(dd_schema_id == MYSQL_SCHEMA_DD_ID);
if (dd_schema_id == INVALID_OBJECT_ID) {
LogErr(ERROR_LEVEL, ER_DD_SCHEMA_NOT_FOUND, MYSQL_SCHEMA_NAME.str);
return dd::end_transaction(thd, true);
}
assert(cache::Storage_adapter::instance()->core_size<Schema>() == 1);
// Verify that the core DD tables are present.
#ifndef NDEBUG
size_t n_core_tables = 0;
#endif
for (System_tables::Const_iterator it =
System_tables::instance()->begin(System_tables::Types::CORE);
it != System_tables::instance()->end();
it = System_tables::instance()->next(it, System_tables::Types::CORE)) {
// Skip extraneous tables for minor downgrade.
if ((*it)->entity() == nullptr) continue;
#ifndef NDEBUG
n_core_tables++;
#endif
Table::Name_key table_key;
Table::update_name_key(&table_key, dd_schema_id, (*it)->entity()->name());
Object_id dd_table_id =
cache::Storage_adapter::instance()->core_get_id<Table>(table_key);
assert(dd_table_id != INVALID_OBJECT_ID);
if (dd_table_id == INVALID_OBJECT_ID) {
LogErr(ERROR_LEVEL, ER_DD_TABLE_NOT_FOUND,
(*it)->entity()->name().c_str());
return dd::end_transaction(thd, true);
}
}
assert(cache::Storage_adapter::instance()->core_size<Abstract_table>() ==
n_core_tables);
// Verify that the dictionary tablespace is present and that its id == 1.
Tablespace::Name_key tspace_key;
Tablespace::update_name_key(&tspace_key, MYSQL_TABLESPACE_NAME.str);
Object_id dd_tspace_id =
cache::Storage_adapter::instance()->core_get_id<Tablespace>(tspace_key);
assert(dd_tspace_id == MYSQL_TABLESPACE_DD_ID);
if (dd_tspace_id == INVALID_OBJECT_ID) {
LogErr(ERROR_LEVEL, ER_DD_TABLESPACE_NOT_FOUND, MYSQL_TABLESPACE_NAME.str);
return dd::end_transaction(thd, true);
}
assert(cache::Storage_adapter::instance()->core_size<Tablespace>() == 1);
return dd::end_transaction(thd, false);
}
} // namespace
///////////////////////////////////////////////////////////////////////////
namespace dd {
namespace bootstrap {
/*
Do the necessary DD-related initialization in the DDSE, and get the
predefined tables and tablespaces.
*/
bool DDSE_dict_init(THD *thd, dict_init_mode_t dict_init_mode, uint version) {
handlerton *ddse = ha_resolve_by_legacy_type(thd, DB_TYPE_INNODB);
/*
The lists with element wrappers are mem root allocated. The wrapped
instances are allocated dynamically in the DDSE. These instances will be
owned by the System_tables registry by the end of this function.
*/
List<const Object_table> ddse_tables;
List<const Plugin_tablespace> ddse_tablespaces;
if (ddse->ddse_dict_init == nullptr ||
ddse->ddse_dict_init(dict_init_mode, version, &ddse_tables,
&ddse_tablespaces))
return true;
/*
Iterate over the table definitions and add them to the System_tables
registry. The Object_table instances will later be used to execute
CREATE TABLE statements to actually create the tables.
If Object_table::is_hidden(), then we add the tables as type DDSE_PRIVATE
(not available neither for DDL nor DML), otherwise, we add them as type
DDSE_PROTECTED (available for DML, not for DDL).
*/
List_iterator<const Object_table> table_it(ddse_tables);
const Object_table *ddse_table = nullptr;
while ((ddse_table = table_it++)) {
System_tables::Types table_type = System_tables::Types::DDSE_PROTECTED;
if (ddse_table->is_hidden()) {
table_type = System_tables::Types::DDSE_PRIVATE;
}
System_tables::instance()->add(MYSQL_SCHEMA_NAME.str, ddse_table->name(),
table_type, ddse_table);
}
/*
Get the server version number from the DD tablespace header and verify
that we are allowed to upgrade from that version. The error handling is done
after adding the ddse tables into the system registry to avoid memory leaks.
*/
if (!opt_initialize) {
uint server_version = 0;
if (ddse->dict_get_server_version == nullptr ||
ddse->dict_get_server_version(&server_version)) {
LogErr(ERROR_LEVEL, ER_CANNOT_GET_SERVER_VERSION_FROM_TABLESPACE_HEADER);
return true;
}
if (server_version != MYSQL_VERSION_ID) {
if (opt_upgrade_mode == UPGRADE_NONE) {
LogErr(ERROR_LEVEL, ER_SERVER_UPGRADE_OFF);
return true;
}
if (!DD_bootstrap_ctx::instance().supported_server_version(
server_version)) {
if (server_version > MYSQL_VERSION_ID &&
!DD_bootstrap_ctx::instance().is_server_patch_downgrade(
server_version))
LogErr(ERROR_LEVEL, ER_INVALID_SERVER_DOWNGRADE_NOT_PATCH,
server_version, MYSQL_VERSION_ID);
else
LogErr(ERROR_LEVEL, ER_SERVER_UPGRADE_VERSION_NOT_SUPPORTED,
server_version);
return true;
}
}
}
/*
At this point, the Systen_tables registry contains the INERT DD tables,
and the DDSE tables. Before we continue, we must add the remaining
DD tables.
*/
System_tables::instance()->add_remaining_dd_tables();
/*
Iterate over the tablespace definitions, add the names and the
tablespace meta data to the System_tablespaces registry. The
meta data will be used later to create dd::Tablespace objects.
The Plugin_tablespace instances are owned by the DDSE.
*/
List_iterator<const Plugin_tablespace> tablespace_it(ddse_tablespaces);
const Plugin_tablespace *tablespace = nullptr;
while ((tablespace = tablespace_it++)) {
// Add the name and the object instance to the registry with the
// appropriate property.
if (my_strcasecmp(system_charset_info, MYSQL_TABLESPACE_NAME.str,
tablespace->get_name()) == 0)
System_tablespaces::instance()->add(
tablespace->get_name(), System_tablespaces::Types::DD, tablespace);
else
System_tablespaces::instance()->add(
tablespace->get_name(), System_tablespaces::Types::PREDEFINED_DDSE,
tablespace);
}
return false;
}
// Initialize the data dictionary.
bool initialize_dictionary(THD *thd, bool is_dd_upgrade_57,
Dictionary_impl *d) {
if (is_dd_upgrade_57)
bootstrap::DD_bootstrap_ctx::instance().set_stage(
bootstrap::Stage::STARTED);
store_predefined_tablespace_metadata(thd);
if (create_dd_schema(thd) || initialize_dd_properties(thd) ||
create_tables(thd, nullptr))
return true;
if (is_dd_upgrade_57) {
// Add status to mark creation of dictionary in InnoDB.
// Till this step, no new undo log is created by InnoDB.
if (upgrade_57::Upgrade_status().update(
upgrade_57::Upgrade_status::enum_stage::DICT_TABLES_CREATED))
return true;
}
DBUG_EXECUTE_IF(
"dd_upgrade_stage_2", if (is_dd_upgrade_57) {
/*
Server will crash will upgrading 5.7 data directory.
This will leave server is an inconsistent state.
File tracking upgrade will have Stage 2 written in it.
Next restart of server on same data directory should
revert all changes done by upgrade and data directory
should be reusable by 5.7 server.
*/
DBUG_SUICIDE();
});
if (DDSE_dict_recover(thd, DICT_RECOVERY_INITIALIZE_SERVER,
d->get_target_dd_version()) ||
flush_meta_data(thd) ||
DDSE_dict_recover(thd, DICT_RECOVERY_INITIALIZE_TABLESPACES,
d->get_target_dd_version()) ||
populate_tables(thd) ||
update_properties(thd, nullptr, nullptr,
String_type(MYSQL_SCHEMA_NAME.str)) ||
verify_contents(thd) || update_versions(thd, is_dd_upgrade_57))
return true;
DBUG_EXECUTE_IF(
"schema_read_only",
if (dd::execute_query(thd, "CREATE SCHEMA schema_read_only") ||
dd::execute_query(thd, "ALTER SCHEMA schema_read_only READ ONLY=1") ||
dd::execute_query(thd, "CREATE TABLE schema_read_only.t(i INT)") ||
dd::execute_query(thd, "DROP SCHEMA schema_read_only"))
assert(false););
bootstrap::DD_bootstrap_ctx::instance().set_stage(bootstrap::Stage::FINISHED);
return false;
}
// First time server start and initialization of the data dictionary.
bool initialize(THD *thd) {
bootstrap::DD_bootstrap_ctx::instance().set_stage(bootstrap::Stage::STARTED);
/*
Set tx_read_only to false to allow installing DD tables even
if the server is started with --transaction-read-only=true.
*/
thd->variables.transaction_read_only = false;
thd->tx_read_only = false;
Disable_autocommit_guard autocommit_guard(thd);
Dictionary_impl *d = dd::Dictionary_impl::instance();
assert(d);
cache::Dictionary_client::Auto_releaser releaser(thd->dd_client());
/*
Each step in the install process below is committed independently,
either implicitly (for e.g. "CREATE TABLE") or explicitly (for the
operations in the "populate()" methods). Thus, there is no need to
commit explicitly here.
*/
if (DDSE_dict_init(thd, DICT_INIT_CREATE_FILES, d->get_target_dd_version()) ||
initialize_dictionary(thd, false, d))
return true;
assert(d->get_target_dd_version() == d->get_actual_dd_version(thd));
LogErr(INFORMATION_LEVEL, ER_DD_VERSION_INSTALLED,
d->get_target_dd_version());
return false;
}
// Normal server restart.
bool restart(THD *thd) {
bootstrap::DD_bootstrap_ctx::instance().set_stage(bootstrap::Stage::STARTED);
/*
Set tx_read_only to false to allow installing DD tables even
if the server is started with --transaction-read-only=true.
*/
thd->variables.transaction_read_only = false;
thd->tx_read_only = false;
// Set explicit_defaults_for_timestamp variable for dictionary creation
thd->variables.explicit_defaults_for_timestamp = true;
Disable_autocommit_guard autocommit_guard(thd);
Dictionary_impl *d = dd::Dictionary_impl::instance();
assert(d);
cache::Dictionary_client::Auto_releaser releaser(thd->dd_client());
store_predefined_tablespace_metadata(thd);
if (create_dd_schema(thd) || initialize_dd_properties(thd) ||
create_tables(thd, nullptr) || sync_meta_data(thd) ||
DDSE_dict_recover(thd, DICT_RECOVERY_RESTART_SERVER,
d->get_actual_dd_version(thd)) ||
upgrade::do_server_upgrade_checks(thd) || upgrade::upgrade_tables(thd) ||
repopulate_charsets_and_collations(thd) || verify_contents(thd) ||
update_versions(thd, false)) {
return true;
}
DBUG_EXECUTE_IF(
"schema_read_only",
if (dd::execute_query(thd, "CREATE SCHEMA schema_read_only") ||
dd::execute_query(thd, "ALTER SCHEMA schema_read_only READ ONLY=1") ||
dd::execute_query(thd, "CREATE TABLE schema_read_only.t(i INT)") ||
dd::execute_query(thd, "DROP SCHEMA schema_read_only") ||
dd::execute_query(thd, "CREATE TABLE IF NOT EXISTS S.restart(i INT)"))
assert(false););
bootstrap::DD_bootstrap_ctx::instance().set_stage(bootstrap::Stage::FINISHED);
LogErr(INFORMATION_LEVEL, ER_DD_VERSION_FOUND, d->get_actual_dd_version(thd));
return false;
}
// Initialize dictionary in case of server restart.
void recover_innodb_upon_upgrade(THD *thd) {
Dictionary_impl *d = dd::Dictionary_impl::instance();
store_predefined_tablespace_metadata(thd);
// RAII to handle error in execution of CREATE TABLE.
Key_length_error_handler key_error_handler;
/*
Ignore ER_TOO_LONG_KEY for dictionary tables during restart.
Do not print the error in error log as we are creating only the
cached objects and not physical tables.
TODO: Workaround due to bug#20629014. Remove when the bug is fixed.
*/
thd->push_internal_handler(&key_error_handler);
if (create_dd_schema(thd) || initialize_dd_properties(thd) ||
create_tables(thd, nullptr) ||
DDSE_dict_recover(thd, DICT_RECOVERY_RESTART_SERVER,
d->get_actual_dd_version(thd))) {
// Error is not be handled in this case as we are on cleanup code path.
LogErr(WARNING_LEVEL, ER_DD_INIT_UPGRADE_FAILED);
}
thd->pop_internal_handler();
return;
}
bool setup_dd_objects_and_collations(THD *thd) {
// Continue with server startup.
bootstrap::DD_bootstrap_ctx::instance().set_stage(
bootstrap::Stage::CREATED_TABLES);
/*
Set tx_read_only to false to allow installing DD tables even
if the server is started with --transaction-read-only=true.
*/
thd->variables.transaction_read_only = false;
thd->tx_read_only = false;