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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
53 lines
1.5 KiB
Text
53 lines
1.5 KiB
Text
#
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# WL#6965: Truncate UNDO logs.
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#
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--source include/big_test.inc
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--source include/not_valgrind.inc
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# With larger innodb_page_size, the undo log tablespaces do not grow enough.
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--source include/innodb_page_size_small.inc
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--source include/have_innodb.inc
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--source include/have_debug.inc
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--source include/have_undo_tablespaces.inc
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# Tests with embedded server do not support restarting
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--source include/not_embedded.inc
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SET GLOBAL innodb_undo_log_truncate = 1;
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let SEARCH_FILE = $MYSQLTEST_VARDIR/log/mysqld.1.err;
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create table t1(keyc int primary key, c char(100)) engine = innodb;
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begin;
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--disable_query_log
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let $i=30000;
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while ($i) {
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eval insert into t1 values(30000-$i, '');
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dec $i;
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}
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--enable_query_log
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commit;
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let $checksum_algorithm = `SELECT @@GLOBAL.innodb_checksum_algorithm`;
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let SEARCH_PATTERN = ib_undo_trunc;
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begin;
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update t1 set c = 'MariaDB';
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update t1 set c = 'InnoDB';
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eval set global debug_dbug = '+d,$SEARCH_PATTERN';
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commit;
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drop table t1;
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call mtr.add_suppression("InnoDB: innodb_undo_tablespaces=0 disables dedicated undo log tablespaces");
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SET GLOBAL innodb_fast_shutdown=0;
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--source include/shutdown_mysqld.inc
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--source include/search_pattern_in_file.inc
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--let $restart_parameters= --innodb-undo-tablespaces=1
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--let $restart_noprint=1
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if ($checksum_algorithm == "strict_full_crc32")
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{
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let $restart_parameters= $restart_parameters --innodb_checksum_algorithm=strict_crc32;
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}
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if ($checksum_algorithm == "strict_crc32")
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{
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let $restart_parameters= $restart_parameters --innodb_checksum_algorithm=strict_full_crc32;
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}
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--source include/start_mysqld.inc
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