# xtrabackup backup
CREATE TABLE t1(i int) ENGINE=InnoDB;
INSERT into t1 values(1);
connect  con2, localhost, root,,;
connection con2;
set lock_wait_timeout=1;
SET debug_sync='copy_data_between_tables_before_reset_backup_lock  SIGNAL go WAIT_FOR after_backup_stage_block_ddl';
SET debug_sync='alter_table_after_temp_table_drop SIGNAL temp_table_dropped';
SET debug_sync='now WAIT_FOR after_backup_stage_start';ALTER TABLE test.t1 FORCE, algorithm=COPY;|
connection default;
connection con2;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
SET debug_sync='RESET';
disconnect con2;
connection default;
# xtrabackup prepare
# shutdown server
# remove datadir
# xtrabackup move back
# restart
SELECT * FROM t1;
i
1
DROP TABLE t1;