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We implement an idea that was suggested by Michael 'Monty' Widenius in October 2017: When InnoDB is inserting into an empty table or partition, we can write a single undo log record TRX_UNDO_EMPTY, which will cause ROLLBACK to clear the table. For this to work, the insert into an empty table or partition must be covered by an exclusive table lock that will be held until the transaction has been committed or rolled back, or the INSERT operation has been rolled back (and the table is empty again), in lock_table_x_unlock(). Clustered index records that are covered by the TRX_UNDO_EMPTY record will carry DB_TRX_ID=0 and DB_ROLL_PTR=1<<55, and thus they cannot be distinguished from what MDEV-12288 leaves behind after purging the history of row-logged operations. Concurrent non-locking reads must be adjusted: If the read view was created before the INSERT into an empty table, then we must continue to imagine that the table is empty, and not try to read any records. If the read view was created after the INSERT was committed, then all records must be visible normally. To implement this, we introduce the field dict_table_t::bulk_trx_id. This special handling only applies to the very first INSERT statement of a transaction for the empty table or partition. If a subsequent statement in the transaction is modifying the initially empty table again, we must enable row-level undo logging, so that we will be able to roll back to the start of the statement in case of an error (such as duplicate key). INSERT IGNORE will continue to use row-level logging and locking, because implementing it would require the ability to roll back the latest row. Since the undo log that we write only allows us to roll back the entire statement, we cannot support INSERT IGNORE. We will introduce a handler::extra() parameter HA_EXTRA_IGNORE_INSERT to indicate to storage engines that INSERT IGNORE is being executed. In many test cases, we add an extra record to the table, so that during the 'interesting' part of the test, row-level locking and logging will be used. Replicas will continue to use row-level logging and locking until MDEV-24622 has been addressed. Likewise, this optimization will be disabled in Galera cluster until MDEV-24623 enables it. dict_table_t::bulk_trx_id: The latest active or committed transaction that initiated an insert into an empty table or partition. Protected by exclusive table lock and a clustered index leaf page latch. ins_node_t::bulk_insert: Whether bulk insert was initiated. trx_t::mod_tables: Use C++11 style accessors (emplace instead of insert). Unlike earlier, this collection will cover also temporary tables. trx_mod_table_time_t: Add start_bulk_insert(), end_bulk_insert(), is_bulk_insert(), was_bulk_insert(). trx_undo_report_row_operation(): Before accessing any undo log pages, invoke trx->mod_tables.emplace() in order to determine whether undo logging was disabled, or whether this is the first INSERT and we are supposed to write a TRX_UNDO_EMPTY record. row_ins_clust_index_entry_low(): If we are inserting into an empty clustered index leaf page, set the ins_node_t::bulk_insert flag for the subsequent trx_undo_report_row_operation() call. lock_rec_insert_check_and_lock(), lock_prdt_insert_check_and_lock(): Remove the redundant parameter 'flags' that can be checked in the caller. btr_cur_ins_lock_and_undo(): Simplify the logic. Correctly write DB_TRX_ID,DB_ROLL_PTR after invoking trx_undo_report_row_operation(). trx_mark_sql_stat_end(), ha_innobase::extra(HA_EXTRA_IGNORE_INSERT), ha_innobase::external_lock(): Invoke trx_t::end_bulk_insert() so that the next statement will not be covered by table-level undo logging. ReadView::changes_visible(trx_id_t) const: New accessor for the case where the trx_id_t is not read from a potentially corrupted index page but directly from the memory. In this case, we can skip a sanity check. row_sel(), row_sel_try_search_shortcut(), row_search_mvcc(): row_sel_try_search_shortcut_for_mysql(), row_merge_read_clustered_index(): Check dict_table_t::bulk_trx_id. row_sel_clust_sees(): Replaces lock_clust_rec_cons_read_sees(). lock_sec_rec_cons_read_sees(): Replaced with lower-level code. btr_root_page_init(): Refactored from btr_create(). dict_index_t::clear(), dict_table_t::clear(): Empty an index or table, for the ROLLBACK of an INSERT operation. ROW_T_EMPTY, ROW_OP_EMPTY: Note a concurrent ROLLBACK of an INSERT into an empty table. This is joint work with Thirunarayanan Balathandayuthapani, who created a working prototype. Thanks to Matthias Leich for extensive testing.
159 lines
6.2 KiB
Text
159 lines
6.2 KiB
Text
include/master-slave.inc
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[connection master]
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connection master;
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set @old_master_binlog_checksum= @@global.binlog_checksum;
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connection slave;
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include/stop_slave.inc
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# Test slave with no capability gets dummy event, which is ignored.
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set @old_dbug= @@global.debug_dbug;
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SET @@global.debug_dbug='+d,simulate_slave_capability_none';
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include/start_slave.inc
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connection master;
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FLUSH LOGS;
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CREATE TABLE t1 (a INT PRIMARY KEY);
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INSERT INTO t1 VALUES (0);
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connection slave;
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connection master;
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ALTER TABLE t1 ORDER BY a;
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connection slave;
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connection slave;
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connection master;
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SET SESSION binlog_annotate_row_events = ON;
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DELETE FROM t1;
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INSERT INTO t1 /* A comment just to make the annotate event sufficiently long that the dummy event will need to get padded with spaces so that we can test that this works */ VALUES(1);
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include/show_binlog_events.inc
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Log_name Pos Event_type Server_id End_log_pos Info
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master-bin.000002 # Gtid # # BEGIN GTID #-#-#
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master-bin.000002 # Annotate_rows # # DELETE FROM t1
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master-bin.000002 # Table_map # # table_id: # (test.t1)
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master-bin.000002 # Delete_rows_v1 # # table_id: # flags: STMT_END_F
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master-bin.000002 # Query # # COMMIT
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master-bin.000002 # Gtid # # BEGIN GTID #-#-#
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master-bin.000002 # Annotate_rows # # INSERT INTO t1 /* A comment just to make the annotate event sufficiently long that the dummy event will need to get padded with spaces so that we can test that this works */ VALUES(1)
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master-bin.000002 # Table_map # # table_id: # (test.t1)
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master-bin.000002 # Write_rows_v1 # # table_id: # flags: STMT_END_F
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master-bin.000002 # Query # # COMMIT
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connection slave;
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connection slave;
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SELECT * FROM t1;
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a
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1
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include/show_events.inc
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Log_name Pos Event_type Server_id End_log_pos Info
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slave-relay-bin.000005 # Query # # BEGIN
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slave-relay-bin.000005 # Annotate_rows # # DELETE FROM t1
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slave-relay-bin.000005 # Table_map # # table_id: # (test.t1)
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slave-relay-bin.000005 # Delete_rows_v1 # # table_id: # flags: STMT_END_F
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slave-relay-bin.000005 # Query # # COMMIT
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slave-relay-bin.000005 # Query # # BEGIN
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slave-relay-bin.000005 # Annotate_rows # # INSERT INTO t1 /* A comment just to make the annotate event sufficiently long that the dummy event will need to get padded with spaces so that we can test that this works */ VALUES(1)
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slave-relay-bin.000005 # Table_map # # table_id: # (test.t1)
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slave-relay-bin.000005 # Write_rows_v1 # # table_id: # flags: STMT_END_F
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slave-relay-bin.000005 # Query # # COMMIT
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set @@global.debug_dbug= @old_dbug;
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# Test dummy event is checksummed correctly.
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connection master;
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set @@global.binlog_checksum = CRC32;
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TRUNCATE t1;
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INSERT INTO t1 VALUES(2);
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include/show_binlog_events.inc
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Log_name Pos Event_type Server_id End_log_pos Info
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master-bin.000003 # Gtid # # BEGIN GTID #-#-#
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master-bin.000003 # Annotate_rows # # INSERT INTO t1 VALUES(2)
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master-bin.000003 # Table_map # # table_id: # (test.t1)
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master-bin.000003 # Write_rows_v1 # # table_id: # flags: STMT_END_F
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master-bin.000003 # Query # # COMMIT
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connection slave;
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connection slave;
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SELECT * FROM t1;
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a
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2
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include/show_events.inc
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Log_name Pos Event_type Server_id End_log_pos Info
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slave-relay-bin.000007 # Query # # BEGIN
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slave-relay-bin.000007 # Annotate_rows # # INSERT INTO t1 VALUES(2)
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slave-relay-bin.000007 # Table_map # # table_id: # (test.t1)
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slave-relay-bin.000007 # Write_rows_v1 # # table_id: # flags: STMT_END_F
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slave-relay-bin.000007 # Query # # COMMIT
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*** MDEV-5754: MySQL 5.5 slaves cannot replicate from MariaDB 10.0 ***
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connection master;
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CREATE TABLE t2 (a INT PRIMARY KEY) ENGINE=InnoDB;
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INSERT INTO t2 VALUES(100);
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connect con1,127.0.0.1,root,,test,$SERVER_MYPORT_1,;
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SET debug_sync='commit_after_release_LOCK_prepare_ordered SIGNAL master_queued1 WAIT_FOR master_cont1';
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INSERT INTO t2 VALUES (1);
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connection master;
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SET debug_sync='now WAIT_FOR master_queued1';
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connect con2,127.0.0.1,root,,test,$SERVER_MYPORT_1,;
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SET debug_sync='commit_after_release_LOCK_prepare_ordered SIGNAL master_queued2';
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INSERT INTO t2 VALUES (2);
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connection master;
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SET debug_sync='now WAIT_FOR master_queued2';
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SET debug_sync='now SIGNAL master_cont1';
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connection con1;
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SET debug_sync='RESET';
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connection con2;
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SET debug_sync='RESET';
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connection master;
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SET debug_sync='RESET';
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include/show_binlog_events.inc
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Log_name Pos Event_type Server_id End_log_pos Info
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master-bin.000003 # Gtid # # BEGIN GTID #-#-# cid=#
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master-bin.000003 # Annotate_rows # # INSERT INTO t2 VALUES (1)
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master-bin.000003 # Table_map # # table_id: # (test.t2)
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master-bin.000003 # Write_rows_v1 # # table_id: # flags: STMT_END_F
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master-bin.000003 # Xid # # COMMIT /* XID */
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master-bin.000003 # Gtid # # BEGIN GTID #-#-# cid=#
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master-bin.000003 # Annotate_rows # # INSERT INTO t2 VALUES (2)
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master-bin.000003 # Table_map # # table_id: # (test.t2)
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master-bin.000003 # Write_rows_v1 # # table_id: # flags: STMT_END_F
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master-bin.000003 # Xid # # COMMIT /* XID */
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connection slave;
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SELECT * FROM t2 ORDER BY a;
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a
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1
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2
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100
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# Test that slave which cannot tolerate holes in binlog stream but
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# knows the event does not get dummy event
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include/stop_slave.inc
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SET @@global.debug_dbug='+d,simulate_slave_capability_old_53';
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include/start_slave.inc
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connection master;
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ALTER TABLE t1 ORDER BY a;
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connection slave;
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connection slave;
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connection master;
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UPDATE t1 SET a = 3;
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include/show_binlog_events.inc
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Log_name Pos Event_type Server_id End_log_pos Info
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master-bin.000003 # Gtid # # BEGIN GTID #-#-#
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master-bin.000003 # Annotate_rows # # UPDATE t1 SET a = 3
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master-bin.000003 # Table_map # # table_id: # (test.t1)
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master-bin.000003 # Update_rows_v1 # # table_id: # flags: STMT_END_F
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master-bin.000003 # Query # # COMMIT
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connection slave;
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connection slave;
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SELECT * FROM t1;
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a
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3
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include/show_events.inc
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Log_name Pos Event_type Server_id End_log_pos Info
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slave-relay-bin.000008 # Query # # BEGIN
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slave-relay-bin.000008 # Annotate_rows # # UPDATE t1 SET a = 3
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slave-relay-bin.000008 # Table_map # # table_id: # (test.t1)
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slave-relay-bin.000008 # Update_rows_v1 # # table_id: # flags: STMT_END_F
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slave-relay-bin.000008 # Query # # COMMIT
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select @@global.log_slave_updates;
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@@global.log_slave_updates
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1
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select @@global.replicate_annotate_row_events;
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@@global.replicate_annotate_row_events
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1
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Clean up.
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connection master;
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set @@global.binlog_checksum = @old_master_binlog_checksum;
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DROP TABLE t1, t2;
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connection slave;
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set @@global.debug_dbug= @old_dbug;
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include/rpl_end.inc
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