--source include/have_innodb.inc
--source include/have_debug.inc
--source include/master-slave.inc

--disable_query_log
call mtr.add_suppression("InnoDB: Transaction was aborted due to ");
--enable_query_log

--echo MDEV-31655: Parallel replication deadlock victim preference code erroneously removed
# The problem was that InnoDB would choose the wrong deadlock victim.
# Create a lot of transactions that can cause deadlocks, and use error
# injection to check that the first transactions in each group is never
# selected as deadlock victim.
--let $rows= 10
--let $transactions= 5
--let $gcos= 10

--connection server_1
ALTER TABLE mysql.gtid_slave_pos ENGINE=InnoDB;
CREATE TABLE t1 (a INT PRIMARY KEY, b INT) ENGINE=InnoDB;
BEGIN;
--disable_query_log
--let $i= 0
while ($i < 10) {
  eval INSERT INTO t1 VALUES ($i, 0);
  inc $i;
}
--enable_query_log
COMMIT;
--source include/save_master_gtid.inc

--connection server_2
--source include/sync_with_master_gtid.inc
--source include/stop_slave.inc
SET @old_parallel_threads=@@GLOBAL.slave_parallel_threads;
SET @old_parallel_mode=@@GLOBAL.slave_parallel_mode;
eval set @@global.slave_parallel_threads= $transactions;
set @@global.slave_parallel_mode= conservative;
SET @old_dbug= @@GLOBAL.debug_dbug;
# This error injection will allow no retries for GTIDs divisible by 1000.
SET GLOBAL debug_dbug= "+d,rpl_mdev31655_zero_retries";

--connection server_1
SET @old_dbug= @@SESSION.debug_dbug;
SET SESSION debug_dbug="+d,binlog_force_commit_id";

--let $j= 1
while ($j <= $gcos) {
  eval SET @commit_id= $j+1000;
  --let $i= 0
  while ($i < $transactions) {
    --disable_query_log
    eval SET SESSION gtid_seq_no= 1000 + 1000*$j + $i;
    BEGIN;
    --let $k= 0
    while ($k < $rows) {
      eval UPDATE t1 SET b=b+1 WHERE a=(($i+$k) MOD $rows);
      inc $k;
    }
    COMMIT;
    --enable_query_log
    inc $i;
  }
  inc $j;
}

SET SESSION debug_dbug= @old_dbug;
SELECT COUNT(*), SUM(a*100*b) FROM t1;

--source include/save_master_gtid.inc

--connection server_2
--source include/start_slave.inc
--source include/sync_with_master_gtid.inc
SET GLOBAL debug_dbug= @old_dbug;
SELECT COUNT(*), SUM(a*100*b) FROM t1;


# Clean up.
--connection server_2
--source include/stop_slave.inc
SET GLOBAL slave_parallel_threads=@old_parallel_threads;
SET GLOBAL slave_parallel_mode=@old_parallel_mode;
--source include/start_slave.inc

--connection server_1
DROP TABLE t1;

--source include/rpl_end.inc