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14685b10df
The motivation of introducing the parameter innodb_purge_rseg_truncate_frequency in mysql/mysql-server@28bbd66ea5 and mysql/mysql-server@8fc2120fed seems to have been to avoid stalls due to freeing undo log pages or truncating undo log tablespaces. In MariaDB Server, innodb_undo_log_truncate=ON should be a much lighter operation than in MySQL, because it will not involve any log checkpoint. Another source of performance stalls should be trx_purge_truncate_rseg_history(), which is shrinking the history list by freeing the undo log pages whose undo records have been purged. To alleviate that, we will introduce a purge_truncation_task that will offload this from the purge_coordinator_task. In that way, the next innodb_purge_batch_size pages may be parsed and purged while the pages from the previous batch are being freed and the history list being shrunk. The processing of innodb_undo_log_truncate=ON will still remain the responsibility of the purge_coordinator_task. purge_coordinator_state::count: Remove. We will ignore innodb_purge_rseg_truncate_frequency, and act as if it had been set to 1 (the maximum shrinking frequency). purge_coordinator_state::do_purge(): Invoke an asynchronous task purge_truncation_callback() to free the undo log pages. purge_sys_t::iterator::free_history(): Free those undo log pages that have been processed. This used to be a part of trx_purge_truncate_history(). purge_sys_t::clone_end_view(): Take a new value of purge_sys.head as a parameter, so that it will be updated while holding exclusive purge_sys.latch. This is needed for race-free access to the field in purge_truncation_callback(). Reviewed by: Vladislav Lesin
71 lines
2.0 KiB
Plaintext
71 lines
2.0 KiB
Plaintext
--source include/have_innodb.inc
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--source innodb_default_row_format.inc
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# The embedded server tests do not support restarting.
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--source include/not_embedded.inc
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# Flush any open myisam tables from previous tests
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FLUSH TABLES;
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--echo #
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--echo # MDEV-11369: Instant ADD COLUMN for InnoDB
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--echo # MDEV-15562: Instant DROP COLUMN or changing the order of columns
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--echo #
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connect to_be_killed, localhost, root;
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SET @old_instant=
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(SELECT variable_value FROM information_schema.global_status
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WHERE variable_name = 'innodb_instant_alter_column');
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CREATE TABLE empty (id INT PRIMARY KEY, c2 INT UNIQUE) ENGINE=InnoDB;
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CREATE TABLE once LIKE empty;
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CREATE TABLE twice LIKE empty;
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CREATE TABLE thrice LIKE empty;
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INSERT INTO once SET id=1,c2=1;
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INSERT INTO twice SET id=1,c2=1;
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INSERT INTO thrice SET id=1,c2=1;
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ALTER TABLE empty ADD COLUMN (d1 INT DEFAULT 15);
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ALTER TABLE once ADD COLUMN (d1 INT DEFAULT 20);
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ALTER TABLE twice ADD COLUMN (d1 INT DEFAULT 20);
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ALTER TABLE thrice ADD COLUMN (d1 INT DEFAULT 20);
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ALTER TABLE twice ADD COLUMN
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(d2 INT NOT NULL DEFAULT 10,
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d3 VARCHAR(15) NOT NULL DEFAULT 'var och en char');
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ALTER TABLE thrice ADD COLUMN
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(d2 INT NOT NULL DEFAULT 10,
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d3 TEXT NOT NULL DEFAULT 'con');
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ALTER TABLE thrice DROP c2, DROP d3, CHANGE d2 d3 INT NOT NULL FIRST;
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SELECT variable_value-@old_instant instants
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FROM information_schema.global_status
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WHERE variable_name = 'innodb_instant_alter_column';
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BEGIN;
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INSERT INTO empty set id=0,c2=42;
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UPDATE once set c2=c2+1;
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UPDATE twice set c2=c2+1;
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UPDATE thrice set d3=d3+1;
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INSERT INTO twice SET id=2,c2=0,d3='';
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INSERT INTO thrice SET id=2,d3=0;
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DELETE FROM empty;
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DELETE FROM once;
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DELETE FROM twice;
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DELETE FROM thrice;
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connection default;
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SET GLOBAL innodb_flush_log_at_trx_commit=1;
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CREATE TABLE foo(a INT PRIMARY KEY) ENGINE=InnoDB;
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--source include/kill_mysqld.inc
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disconnect to_be_killed;
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--source include/start_mysqld.inc
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DROP TABLE foo;
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--source include/wait_all_purged.inc
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SELECT * FROM empty;
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SELECT * FROM once;
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SELECT * FROM twice;
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SELECT * FROM thrice;
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DROP TABLE empty, once, twice, thrice;
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