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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
68 lines
2.1 KiB
Plaintext
68 lines
2.1 KiB
Plaintext
--source include/have_innodb.inc
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--source include/innodb_page_size.inc
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--source include/have_undo_tablespaces.inc
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--source include/not_embedded.inc
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--source include/have_sequence.inc
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--source include/no_valgrind_without_big.inc
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--disable_query_log
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call mtr.add_suppression("InnoDB: Difficult to find free blocks in the buffer pool");
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--disable_query_log
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# This may be triggered on a slow system.
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call mtr.add_suppression("InnoDB: Trying to delete tablespace.*pending operations");
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--enable_query_log
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SET GLOBAL innodb_undo_log_truncate = 0;
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LET $MYSQLD_DATADIR = `select @@datadir`;
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LET $INNODB_PAGE_SIZE = `select @@innodb_page_size`;
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--source suite/innodb/include/show_i_s_tablespaces.inc
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#-----------------------------------------------------------------------------
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#
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# Perform DML action using multiple clients and multiple undo tablespace.
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#
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#
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create table t1(keyc int primary key, c char(100)) engine = innodb;
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create table t2(keyc int primary key, c char(100)) engine = innodb;
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#
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let DATADIR = `select @@datadir`;
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connect (con1,localhost,root,,);
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begin;
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send insert into t1 select seq,'a' from seq_1_to_20000;
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connect (con2,localhost,root,,);
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begin;
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send insert into t2 select seq,'a' from seq_1_to_20000;
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connection con1; reap; send update t1 set c = 'mysql';
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connection con2; reap; send update t2 set c = 'mysql';
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connection con1; reap; send update t1 set c = 'oracle';
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connection con2; reap; send update t2 set c = 'oracle';
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connection con1; reap; send delete from t1;
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connection con2; reap; delete from t2;
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connection con1; reap;
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SET GLOBAL innodb_undo_log_truncate = 1;
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commit; disconnect con1;
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connection con2; commit; disconnect con2;
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connection default;
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--replace_regex /.*Trx id counter ([0-9]+).*/\1/
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let $trx_before= `SHOW ENGINE INNODB STATUS`;
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let $trx_before= `select substr('$trx_before',9)+2`;
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SET GLOBAL innodb_max_purge_lag_wait=0;
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set global innodb_fast_shutdown=0;
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--source include/restart_mysqld.inc
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--replace_regex /.*Trx id counter ([0-9]+).*/\1/
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let $trx_after= `SHOW ENGINE INNODB STATUS`;
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let $trx_after= `select substr('$trx_after',9)`;
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drop table t1, t2;
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if ($trx_before > $trx_after)
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{
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echo Transaction sequence mismatch: $trx_before > $trx_after;
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}
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