92 lines
3.3 KiB
Plaintext
92 lines
3.3 KiB
Plaintext
First initialize the binlog
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reset master;
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DROP TABLE IF EXISTS t1;
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Test that binlog purging doesn't use table lock on ndb_binlog_index
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Put some real stuff in the Binlog.
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create table test.t1 (
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pk integer primary key auto_increment,
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a varchar(1000)
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) engine=ndb;
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insert into test.t1 values (NULL, repeat('BJC', 300));
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insert into test.t1 select NULL, a from test.t1;
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insert into test.t1 select NULL, a from test.t1;
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insert into test.t1 select NULL, a from test.t1;
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insert into test.t1 select NULL, a from test.t1;
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insert into test.t1 select NULL, a from test.t1;
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insert into test.t1 select NULL, a from test.t1;
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insert into test.t1 select NULL, a from test.t1;
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insert into test.t1 select NULL, a from test.t1;
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insert into test.t1 select NULL, a from test.t1;
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insert into test.t1 select NULL, a from test.t1;
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insert into test.t1 select NULL, a from test.t1;
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select trim(trailing "binlog.000001" from File)
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from mysql.ndb_binlog_index
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where epoch in (select max(epoch) from mysql.ndb_binlog_index)
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into @file_prefix;
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select concat(@file_prefix, "binlog.000001") into @file1;
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Have at least 100 epoch rows
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select count(*)/100 > 0 from mysql.ndb_binlog_index where File=@file1;
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count(*)/100 > 0
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1
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Flush log to get onto the next file...
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FLUSH LOGS;
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select concat(@file_prefix, "binlog.000002") into @file2;
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create table test.files(file1 varchar(255), file2 varchar(255));
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insert into test.files values(@file1, @file2);
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Pick one row from ndb_binlog_index
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CREATE TEMPORARY TABLE my_ndb_binlog_index (
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epoch BIGINT UNSIGNED NOT NULL,
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orig_server_id INT UNSIGNED NOT NULL,
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orig_epoch BIGINT UNSIGNED NOT NULL
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);
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insert into my_ndb_binlog_index
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select epoch, orig_server_id, orig_epoch
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from mysql.ndb_binlog_index
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where File=@file1 limit 1;
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select epoch from my_ndb_binlog_index into @epoch;
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select orig_server_id from my_ndb_binlog_index into @orig_server_id;
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select orig_epoch from my_ndb_binlog_index into @orig_epoch;
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Lock one row to block purge
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start transaction;
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select count(1) from mysql.ndb_binlog_index
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where epoch = @epoch and
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orig_server_id = @orig_server_id and
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orig_epoch = @orig_epoch and
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File=@file1 for update;
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count(1)
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1
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Check that there are no rows in the next file
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select count(*)=0 from mysql.ndb_binlog_index where File=@file2;
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count(*)=0
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1
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Start the purge that will get stuck on one row
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PURGE BINARY LOGS TO 'binlog.000002';
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Wait 10 sec for purge to run into the row lock
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Now we should still have some rows in the first file (since the purge is stuck)
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select count(*)>0 from mysql.ndb_binlog_index where File=@file1;
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count(*)>0
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1
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Insert some more rows
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insert into test.t1 select NULL, a from test.t1;
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Wait for rows to be committed to binlog
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Now we see rows in the next file (which means there is no table lock)
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select count(*)>0 from mysql.ndb_binlog_index where File=@file2;
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count(*)>0
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1
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Release the purge
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commit;
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Purge done
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Now we should have no rows in the first file
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select @result:=count(*)=0 from mysql.ndb_binlog_index where File=@file1;
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@result:=count(*)=0
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1
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Warnings:
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Warning 1287 Setting user variables within expressions is deprecated and will be removed in a future release. Consider alternatives: 'SET variable=expression, ...', or 'SELECT expression(s) INTO variables(s)'.
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Now we still should see rows in the next file
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select count(*)>0 from mysql.ndb_binlog_index where File=@file2;
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count(*)>0
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1
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cleanup
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drop table test.t1, test.files;
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Done
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