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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
47 lines
1.4 KiB
Plaintext
47 lines
1.4 KiB
Plaintext
--source include/have_innodb.inc
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--source include/have_debug.inc
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--source include/not_embedded.inc
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call mtr.add_suppression("Checksum mismatch in the first page of file");
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let INNODB_PAGE_SIZE=`select @@innodb_page_size`;
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let MYSQLD_DATADIR=`select @@datadir`;
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show variables like 'innodb_doublewrite';
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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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--source include/wait_all_purged.inc
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set GLOBAL innodb_log_checkpoint_now=1;
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--source ../include/no_checkpoint_start.inc
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--echo # 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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sleep 1;
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--let CLEANUP_IF_CHECKPOINT=drop table t1;
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--source ../include/no_checkpoint_end.inc
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perl;
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use IO::Handle;
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my $fname= "$ENV{'MYSQLD_DATADIR'}/undo001";
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my $page_size = $ENV{INNODB_PAGE_SIZE};
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die unless open(FILE, "+<", $fname);
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sysread(FILE, $page, $page_size)==$page_size||die "Unable to read $name\n";
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substr($page, 49, 4) = pack("N", 1000);
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sysseek(FILE, 0, 0)||die "Unable to seek $fname\n";
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die unless syswrite(FILE, $page, $page_size) == $page_size;
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close FILE;
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EOF
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--source include/start_mysqld.inc
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let SEARCH_FILE= $MYSQLTEST_VARDIR/log/mysqld.1.err;
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let SEARCH_PATTERN= Checksum mismatch in the first page of file;
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--source include/search_pattern_in_file.inc
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check table t1;
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drop table t1;
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