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18eab4a832
The purpose of non-exclusive locks in a transaction is to guarantee that the records covered by those locks must remain in that way until the transaction is committed. (The purpose of gap locks is to ensure that a record that was nonexistent will remain that way.) Once a transaction has reached the XA PREPARE state, the only allowed further actions are XA ROLLBACK or XA COMMIT. Therefore, it can be argued that only the exclusive locks that the XA PREPARE transaction is holding are essential. Furthermore, InnoDB never preserved explicit locks across server restart. For XA PREPARE transations, we will only recover implicit exclusive locks for records that had been modified. Because of the fact that XA PREPARE followed by a server restart will cause some locks to be lost, we might as well always release all non-exclusive locks during the execution of an XA PREPARE statement. lock_release_on_prepare(): Release non-exclusive locks on XA PREPARE. trx_prepare(): Invoke lock_release_on_prepare() unless the isolation level is SERIALIZABLE or this is an internal distributed transaction with the binlog (not actual XA PREPARE statement). This has been discussed with Sergei Golubchik and Andrei Elkin. Reviewed by: Sergei Golubchik
434 lines
10 KiB
PHP
434 lines
10 KiB
PHP
#
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# This "body" file checks general properties of XA transaction replication
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# as of MDEV-742.
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# Parameters:
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# --let rpl_xa_check= SELECT ...
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#
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connection master;
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create table t1 (a int, b int) engine=InnoDB;
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insert into t1 values(0, 0);
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xa start 't';
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insert into t1 values(1, 2);
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xa end 't';
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xa prepare 't';
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xa commit 't';
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sync_slave_with_master;
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let $diff_tables= master:t1, slave:t1;
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source include/diff_tables.inc;
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connection master;
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xa start 't';
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insert into t1 values(3, 4);
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xa end 't';
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xa prepare 't';
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xa rollback 't';
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sync_slave_with_master;
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let $diff_tables= master:t1, slave:t1;
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source include/diff_tables.inc;
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connection master;
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--disable_warnings
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SET pseudo_slave_mode=1;
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--enable_warnings
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create table t2 (a int) engine=InnoDB;
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xa start 't';
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insert into t1 values (5, 6);
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xa end 't';
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xa prepare 't';
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xa start 's';
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insert into t2 values (0);
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xa end 's';
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xa prepare 's';
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--source include/save_master_gtid.inc
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connection slave;
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source include/sync_with_master_gtid.inc;
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if ($rpl_xa_check)
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{
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--eval $rpl_xa_check
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if ($rpl_xa_verbose)
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{
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--eval SELECT $rpl_xa_check_lhs
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--eval SELECT $rpl_xa_check_rhs
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}
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}
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sorted_result;
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xa recover;
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connection master;
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xa commit 't';
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xa commit 's';
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--disable_warnings
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SET pseudo_slave_mode=0;
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--enable_warnings
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sync_slave_with_master;
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let $diff_tables= master:t1, slave:t1;
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source include/diff_tables.inc;
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let $diff_tables= master:t2, slave:t2;
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source include/diff_tables.inc;
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#
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# Read-only XA remains prepared after disconnect and must rollback at XA-complete
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# after recoonect. To the read-only also belongs non-transactional engine XA.
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#
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--connection master
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--echo *** At the start of read-only section gtid list is:
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flush logs;
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--let $binlog_file= query_get_value(SHOW MASTER STATUS, File, 1)
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--source include/show_gtid_list.inc
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set @query1="select 1";
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set @query2="select count(*) into @s2 from t1";
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--let $ro_cases=2
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--let $db=test
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# No disconnect
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--let $p_trx=$ro_cases
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while ($p_trx)
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{
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--connection master
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--let $xid=ro_$p_trx
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--let $query=`SELECT @query$p_trx`
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--source rpl_create_xa_prepared.inc
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--let $complete=`select if(floor(rand()*10)%2,'COMMIT','ROLLBACK')`
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--error 0
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--disable_query_log
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--disable_result_log
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--eval xa $complete '$xid'
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--enable_result_log
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--enable_query_log
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--disconnect master_$xid
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--source include/wait_until_disconnected.inc
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--dec $p_trx
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}
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--let $p_trx=$ro_cases
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# With diconnect
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while ($p_trx)
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{
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--connection master
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--let $xid=ro_$p_trx
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--let $query=`SELECT @query$p_trx`
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--source rpl_create_xa_prepared.inc
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--disconnect master_$xid
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--source include/wait_until_disconnected.inc
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--dec $p_trx
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}
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--echo *** $ro_cases prepared xa:s must be in the list:
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--connection master
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sorted_result;
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xa recover;
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--let $p_trx=$ro_cases
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while ($p_trx)
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{
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--let $xid=ro_$p_trx
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--let $complete=`select if(floor(rand()*10)%2,'COMMIT','ROLLBACK')`
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--disable_query_log
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--disable_result_log
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--error ER_XA_RBROLLBACK
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--eval xa $complete '$xid'
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--enable_result_log
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--enable_query_log
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--dec $p_trx
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}
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--echo *** Zero prepared xa:s must be in the list:
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xa recover;
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--echo *** At the end of read-only section gtid list has 0 more compare with previous check:
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flush logs;
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--let $binlog_file= query_get_value(SHOW MASTER STATUS, File, 1)
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--source include/show_gtid_list.inc
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#
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# XA logging cases while some of XA resources are read-only
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#
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# A1. Binlog filter
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--let $db=test_ign
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--eval create database $db
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set @@sql_log_bin = 0;
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--eval create table $db.t (a int) engine=InnoDB
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set @@sql_log_bin = 1;
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--let $xid=rw_no_binlog
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--let $query=insert into $db.t set a=1
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--source rpl_create_xa_prepared.inc
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--disconnect master_$xid
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--source include/wait_until_disconnected.inc
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--echo *** $xid must be in the list:
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--connection master
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xa recover;
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--let $complete=`select if(floor(rand()*10)%2,'COMMIT','ROLLBACK')`
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--error 0
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--disable_query_log
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--disable_result_log
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--eval xa $complete '$xid'
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--enable_result_log
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--enable_query_log
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--echo *** Zero must be in the list:
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--connection master
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xa recover;
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# restore for the following tests
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--let $db=test
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--echo *** At the end of --binlog-ignore-db section gtid list has 2 more:
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flush logs;
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--let $binlog_file= query_get_value(SHOW MASTER STATUS, File, 1)
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--source include/show_gtid_list.inc
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#
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# A2. Opposite to A1, ineffective execution in Engine may create a
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# binlog transaction
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#
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connection master;
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create table t3 (a int) engine=innodb;
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--echo *** the disconnected prepare case
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--let $xid=rw_binlog_only
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--let $query=delete from t3
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--connect (master_$xid, 127.0.0.1,root,,$db,$MASTER_MYPORT,)
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set @@binlog_format=statement;
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# --source rpl_create_xa_prepared.inc
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--eval xa start '$xid'
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--eval $query
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--eval xa end '$xid'
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--eval xa prepare '$xid'
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--disconnect master_$xid
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--source include/wait_until_disconnected.inc
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connection master;
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--echo *** $xid must be in the list:
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xa recover;
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--let $complete=`select if(floor(rand()*10)%2,'COMMIT','ROLLBACK')`
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--disable_query_log
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--disable_result_log
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--eval xa $complete '$xid'
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--enable_result_log
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--enable_query_log
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--echo *** Zero must be in the list:
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xa recover;
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--echo *** the same connection complete case.
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connection master;
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--let $xid=rw_binlog_only
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--let $query=delete from t3
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--connect (master_$xid, 127.0.0.1,root,,$db,$MASTER_MYPORT,)
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set @@binlog_format=statement;
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# --source rpl_create_xa_prepared.inc
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--eval xa start '$xid'
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--eval $query
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--eval xa end '$xid'
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--eval xa prepare '$xid'
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--echo *** $xid must be in the list:
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xa recover;
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--disable_query_log
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--disable_result_log
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--eval xa $complete '$xid'
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--enable_result_log
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--enable_query_log
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--disconnect master_$xid
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--source include/wait_until_disconnected.inc
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--echo *** Zero must be in the list:
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--connection master
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xa recover;
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--echo *** At the end of ineffective in engine section gtid list has 5 more:
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flush logs;
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--let $binlog_file= query_get_value(SHOW MASTER STATUS, File, 1)
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--source include/show_gtid_list.inc
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#
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# A3 MyISAM "xa" logs empty XA-prepare group, followed by
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# an XA-complete event
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create table tm (a int) engine=myisam;
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# No disconnect
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--connection master
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--let $xid=rw_myisam
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--let $query=insert into tm set a=1
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--source rpl_create_xa_prepared.inc
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--let $complete=`select if(floor(rand()*10)%2,'COMMIT','ROLLBACK')`
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--error 0
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--disable_query_log
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--disable_result_log
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--eval xa $complete '$xid'
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--enable_result_log
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--enable_query_log
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--disconnect master_$xid
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--source include/wait_until_disconnected.inc
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# With diconnect
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--connection master
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--source rpl_create_xa_prepared.inc
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--disconnect master_$xid
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--source include/wait_until_disconnected.inc
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--echo *** $xid prepared must be in the list:
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--connection master
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xa recover;
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--let $complete=`select if(floor(rand()*10)%2,'COMMIT','ROLLBACK')`
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--disable_query_log
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--disable_result_log
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--eval xa $complete '$xid'
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--enable_result_log
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--enable_query_log
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--echo *** Zero prepared xa:s must be in the list:
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xa recover;
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--echo *** At the end of MyISAM "xa" section gtid list has 7 more compare with previous check:
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flush logs;
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--let $binlog_file= query_get_value(SHOW MASTER STATUS, File, 1)
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--source include/show_gtid_list.inc
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# B. Session binlog disable does not log even empty XA-prepare
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# Therefore XA-complete should be also run in sql_log_bin-OFF environment.
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--let $db=test
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--let $xid=skip_binlog
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--let $query=insert into t2 values(1)
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--connect (master_$xid, 127.0.0.1,root,,$db,$MASTER_MYPORT,)
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set @@session.sql_log_bin = OFF;
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--eval xa start '$xid'
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--eval $query
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--eval xa end '$xid'
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--eval xa prepare '$xid'
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--disconnect master_$xid
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--source include/wait_until_disconnected.inc
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--echo *** $xid must be in the list:
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--connection master
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xa recover;
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# now commit it carefully to avoid binlogging as the prepare part did
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set @@session.sql_log_bin = OFF;
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--eval xa rollback '$xid'
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set @@session.sql_log_bin = ON;
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--source include/save_master_gtid.inc
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--echo *** Zero must be in the list:
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--connection master
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xa recover;
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--echo *** At the end of skip_log_binb section gtid list has 0 more:
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flush logs;
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--let $binlog_file= query_get_value(SHOW MASTER STATUS, File, 1)
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--source include/show_gtid_list.inc
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#
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# sync slave successfully to prove its consistency
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#
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--connection slave
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source include/sync_with_master_gtid.inc;
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connection master;
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--eval drop database test_ign
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drop table t1, t2, t3, tm;
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--echo #
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--echo # MDEV-26682 slave lock timeout with XA and gap locks
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--echo #
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create table t1 (a int primary key, b int unique) engine=innodb;
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insert t1 values (1,1),(3,3),(5,5);
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sync_slave_with_master;
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# set a strong isolation level to keep the read view below.
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# alternatively a long-running select can do that too even in read-committed
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set session tx_isolation='repeatable-read';
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start transaction;
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# opens a read view to disable purge on the slave
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select * from t1;
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connect m2, localhost, root;
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# now, delete a value, purge it on the master, but not on the slave
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delete from t1 where a=3;
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xa start 'x1';
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# this sets a gap lock on <3>, when it exists (so, on the slave)
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update t1 set b=3 where a=5;
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xa end 'x1';
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xa prepare 'x1';
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connect m3, localhost, root;
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# and this tries to insert straight into the locked gap
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insert t1 values (2, 2);
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echo -->slave;
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sync_slave_with_master;
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commit;
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select * from t1;
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connection m2;
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xa rollback 'x1';
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disconnect m2;
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disconnect m3;
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connection master;
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drop table t1;
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create table t1 (id int auto_increment primary key, c1 int not null unique)
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engine=innodb;
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create table t2 (id int auto_increment primary key, c1 int not null,
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foreign key(c1) references t1(c1), unique key(c1)) engine=innodb;
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insert t1 values (869,1), (871,3), (873,4), (872,5), (870,6), (877,7);
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insert t2 values (795,6), (800,7);
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xa start '1';
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update t2 set id = 9, c1 = 5 where c1 in (null, null, null, null, null, 7, 3);
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connect con1, localhost,root;
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xa start '2';
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delete from t1 where c1 like '3%';
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xa end '2';
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xa prepare '2';
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connection master;
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xa end '1';
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xa prepare '1';
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echo ->slave;
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sync_slave_with_master;
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connection slave;
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source include/sync_with_master_gtid.inc;
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connection con1;
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xa commit '2';
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disconnect con1;
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connection master;
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xa commit '1';
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drop table t2, t1;
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