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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
20 lines
739 B
Text
20 lines
739 B
Text
call mtr.add_suppression("Checksum mismatch in the first page of file");
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show variables like 'innodb_doublewrite';
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Variable_name Value
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innodb_doublewrite ON
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create table t1(f1 int not null, f2 int not null)engine=innodb;
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insert into t1 values (1, 1);
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InnoDB 0 transactions not purged
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set GLOBAL innodb_log_checkpoint_now=1;
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# Make the first page dirty for undo tablespace
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set global innodb_saved_page_number_debug = 0;
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set global innodb_fil_make_page_dirty_debug = 1;
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SET GLOBAL innodb_max_dirty_pages_pct_lwm=0.0;
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SET GLOBAL innodb_max_dirty_pages_pct=0.0;
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# Kill the server
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# restart
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FOUND 1 /Checksum mismatch in the first page of file/ in mysqld.1.err
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check table t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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drop table t1;
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