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There are a few different cases to consider
Logging of CREATE TABLE and CREATE TABLE ... LIKE
- If REPLACE is used and there was an existing table, DDL log the drop of
the table.
- If discovery of table is to be done
- DDL LOG create table
else
- DDL log create table (with engine type)
- create the table
- If table was created
- Log entry to binary log with xid
- Mark DDL log completed
Crash recovery:
- If query was in binary log do nothing and exit
- If discoverted table
- Delete the .frm file
-else
- Drop created table and frm file
- If table was dropped, write a DROP TABLE statement in binary log
CREATE TABLE ... SELECT required a little more work as when one is using
statement logging the query is written to the binary log before commit is
done.
This was fixed by adding a DROP TABLE to the binary log during crash
recovery if the ddl log entry was not closed. In this case the binary log
will contain:
CREATE TABLE xxx ... SELECT ....
DROP TABLE xxx;
Other things:
- Added debug_crash_here() functionality to Aria to be able to test
crash in create table between the creation of the .MAI and the .MAD files.
270 lines
9.1 KiB
C
270 lines
9.1 KiB
C
/*
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Copyright (c) 2000, 2019, Oracle and/or its affiliates.
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Copyright (c) 2010, 2021, MariaDB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA
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*/
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/* External interfaces to ddl log functions */
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#ifndef DDL_LOG_INCLUDED
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#define DDL_LOG_INCLUDED
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enum ddl_log_entry_code
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{
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/*
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DDL_LOG_UNKOWN
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Here mainly to detect blocks that are all zero
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DDL_LOG_EXECUTE_CODE:
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This is a code that indicates that this is a log entry to
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be executed, from this entry a linked list of log entries
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can be found and executed.
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DDL_LOG_ENTRY_CODE:
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An entry to be executed in a linked list from an execute log
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entry.
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DDL_IGNORE_LOG_ENTRY_CODE:
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An entry that is to be ignored
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*/
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DDL_LOG_UNKNOWN= 0,
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DDL_LOG_EXECUTE_CODE= 1,
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DDL_LOG_ENTRY_CODE= 2,
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DDL_IGNORE_LOG_ENTRY_CODE= 3,
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DDL_LOG_ENTRY_CODE_LAST= 4
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};
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/*
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When adding things below, also add an entry to ddl_log_action_names and
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ddl_log_entry_phases in ddl_log.cc
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*/
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enum ddl_log_action_code
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{
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/*
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The type of action that a DDL_LOG_ENTRY_CODE entry is to
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perform.
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*/
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DDL_LOG_UNKNOWN_ACTION= 0,
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/* Delete a .frm file or a table in the partition engine */
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DDL_LOG_DELETE_ACTION= 1,
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/* Rename a .frm fire a table in the partition engine */
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DDL_LOG_RENAME_ACTION= 2,
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/*
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Rename an entity after removing the previous entry with the
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new name, that is replace this entry.
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*/
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DDL_LOG_REPLACE_ACTION= 3,
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/* Exchange two entities by renaming them a -> tmp, b -> a, tmp -> b */
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DDL_LOG_EXCHANGE_ACTION= 4,
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/*
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log do_rename(): Rename of .frm file, table, stat_tables and triggers
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*/
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DDL_LOG_RENAME_TABLE_ACTION= 5,
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DDL_LOG_RENAME_VIEW_ACTION= 6,
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DDL_LOG_DROP_INIT_ACTION= 7,
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DDL_LOG_DROP_TABLE_ACTION= 8,
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DDL_LOG_DROP_VIEW_ACTION= 9,
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DDL_LOG_DROP_TRIGGER_ACTION= 10,
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DDL_LOG_DROP_DB_ACTION=11,
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DDL_LOG_CREATE_TABLE_ACTION=12,
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DDL_LOG_LAST_ACTION /* End marker */
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};
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/* Number of phases for each ddl_log_action_code */
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extern const uchar ddl_log_entry_phases[DDL_LOG_LAST_ACTION];
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enum enum_ddl_log_exchange_phase {
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EXCH_PHASE_NAME_TO_TEMP= 0,
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EXCH_PHASE_FROM_TO_NAME= 1,
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EXCH_PHASE_TEMP_TO_FROM= 2,
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EXCH_PHASE_END
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};
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enum enum_ddl_log_rename_table_phase {
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DDL_RENAME_PHASE_TRIGGER= 0,
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DDL_RENAME_PHASE_STAT,
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DDL_RENAME_PHASE_TABLE,
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DDL_RENAME_PHASE_END
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};
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enum enum_ddl_log_drop_table_phase {
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DDL_DROP_PHASE_TABLE=0,
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DDL_DROP_PHASE_TRIGGER,
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DDL_DROP_PHASE_BINLOG,
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DDL_DROP_PHASE_RESET, /* Reset found list of dropped tables */
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DDL_DROP_PHASE_END
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};
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enum enum_ddl_log_drop_db_phase {
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DDL_DROP_DB_PHASE_INIT=0,
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DDL_DROP_DB_PHASE_LOG,
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DDL_DROP_DB_PHASE_END
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};
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enum enum_ddl_log_create_table_phase {
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DDL_CREATE_TABLE_PHASE_INIT=0,
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DDL_CREATE_TABLE_PHASE_LOG,
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DDL_CREATE_TABLE_PHASE_END
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};
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/*
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Setting ddl_log_entry.phase to this has the same effect as setting
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the phase to the maximum phase (..PHASE_END) for an entry.
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*/
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#define DDL_LOG_FINAL_PHASE ((uchar) 0xff)
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typedef struct st_ddl_log_entry
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{
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LEX_CSTRING name;
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LEX_CSTRING from_name;
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LEX_CSTRING handler_name;
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LEX_CSTRING tmp_name;
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LEX_CSTRING db;
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LEX_CSTRING from_db;
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LEX_CSTRING from_handler_name;
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uchar uuid[MY_UUID_SIZE]; // UUID for new frm file
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ulonglong xid; // Xid stored in the binary log
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/*
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unique_id can be used to store a unique number to check current state.
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Currently it is used to store new size of frm file, link to another ddl log
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entry or store an a uniq version for a storage engine in alter table.
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For execute entries this is reused as an execute counter to ensure we
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don't repeat an entry too many times if executing the entry fails.
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*/
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ulonglong unique_id;
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uint next_entry;
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uint entry_pos; // Set by write_dll_log_entry()
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uint16 flags; // Flags unique for each command
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enum ddl_log_entry_code entry_type; // Set automatically
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enum ddl_log_action_code action_type;
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/*
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Most actions have only one phase. REPLACE does however have two
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phases. The first phase removes the file with the new name if
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there was one there before and the second phase renames the
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old name to the new name.
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*/
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uchar phase; // set automatically
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} DDL_LOG_ENTRY;
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typedef struct st_ddl_log_memory_entry
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{
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uint entry_pos;
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struct st_ddl_log_memory_entry *next_log_entry;
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struct st_ddl_log_memory_entry *prev_log_entry;
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struct st_ddl_log_memory_entry *next_active_log_entry;
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} DDL_LOG_MEMORY_ENTRY;
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/*
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State of the ddl log during execution of a DDL.
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A ddl log state has one execute entry (main entry pointing to the first
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action entry) and many 'action entries' linked in a list in the order
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they should be executed.
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One recovery the log is parsed and all execute entries will be executed.
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All entries are stored as separate blocks in the ddl recovery file.
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*/
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typedef struct st_ddl_log_state
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{
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/* List of ddl log entries */
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DDL_LOG_MEMORY_ENTRY *list;
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/* One execute entry per list */
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DDL_LOG_MEMORY_ENTRY *execute_entry;
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bool is_active() { return list != 0; }
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} DDL_LOG_STATE;
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/* These functions are for recovery */
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bool ddl_log_initialize();
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void ddl_log_release();
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bool ddl_log_close_binlogged_events(HASH *xids);
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int ddl_log_execute_recovery();
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/* functions for updating the ddl log */
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bool ddl_log_write_entry(DDL_LOG_ENTRY *ddl_log_entry,
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DDL_LOG_MEMORY_ENTRY **active_entry);
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bool ddl_log_write_execute_entry(uint first_entry,
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DDL_LOG_MEMORY_ENTRY **active_entry);
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bool ddl_log_disable_execute_entry(DDL_LOG_MEMORY_ENTRY **active_entry);
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void ddl_log_complete(DDL_LOG_STATE *ddl_log_state);
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void ddl_log_revert(THD *thd, DDL_LOG_STATE *ddl_log_state);
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bool ddl_log_update_phase(DDL_LOG_STATE *entry, uchar phase);
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bool ddl_log_update_xid(DDL_LOG_STATE *state, ulonglong xid);
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bool ddl_log_disable_entry(DDL_LOG_STATE *state);
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bool ddl_log_increment_phase(uint entry_pos);
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void ddl_log_release_memory_entry(DDL_LOG_MEMORY_ENTRY *log_entry);
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bool ddl_log_sync();
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bool ddl_log_execute_entry(THD *thd, uint first_entry);
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void ddl_log_release_entries(DDL_LOG_STATE *ddl_log_state);
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bool ddl_log_rename_table(THD *thd, DDL_LOG_STATE *ddl_state,
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handlerton *hton,
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const LEX_CSTRING *org_db,
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const LEX_CSTRING *org_alias,
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const LEX_CSTRING *new_db,
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const LEX_CSTRING *new_alias);
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bool ddl_log_rename_view(THD *thd, DDL_LOG_STATE *ddl_state,
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const LEX_CSTRING *org_db,
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const LEX_CSTRING *org_alias,
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const LEX_CSTRING *new_db,
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const LEX_CSTRING *new_alias);
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bool ddl_log_drop_table_init(THD *thd, DDL_LOG_STATE *ddl_state,
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const LEX_CSTRING *db,
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const LEX_CSTRING *comment);
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bool ddl_log_drop_view_init(THD *thd, DDL_LOG_STATE *ddl_state,
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const LEX_CSTRING *db);
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bool ddl_log_drop_table(THD *thd, DDL_LOG_STATE *ddl_state,
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handlerton *hton,
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const LEX_CSTRING *path,
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const LEX_CSTRING *db,
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const LEX_CSTRING *table);
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bool ddl_log_drop_view(THD *thd, DDL_LOG_STATE *ddl_state,
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const LEX_CSTRING *path,
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const LEX_CSTRING *db,
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const LEX_CSTRING *table);
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bool ddl_log_drop_trigger(THD *thd, DDL_LOG_STATE *ddl_state,
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const LEX_CSTRING *db,
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const LEX_CSTRING *table,
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const LEX_CSTRING *trigger_name,
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const LEX_CSTRING *query);
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bool ddl_log_drop_view(THD *thd, DDL_LOG_STATE *ddl_state,
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const LEX_CSTRING *path,
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const LEX_CSTRING *db,
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const LEX_CSTRING *table);
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bool ddl_log_drop_view(THD *thd, DDL_LOG_STATE *ddl_state,
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const LEX_CSTRING *db);
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bool ddl_log_drop_db(THD *thd, DDL_LOG_STATE *ddl_state,
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const LEX_CSTRING *db, const LEX_CSTRING *path);
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bool ddl_log_create_table(THD *thd, DDL_LOG_STATE *ddl_state,
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handlerton *hton,
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const LEX_CSTRING *path,
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const LEX_CSTRING *db,
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const LEX_CSTRING *table,
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bool only_frm);
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extern mysql_mutex_t LOCK_gdl;
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#endif /* DDL_LOG_INCLUDED */
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