--source include/have_innodb.inc
--source include/have_debug.inc
--source include/have_debug_sync.inc
# need to restart server
--source include/not_embedded.inc

--disable_query_log
# Ignore messages from the innodb_force_recovery=5 startup.
call mtr.add_suppression("\\[ERROR\\] InnoDB: Failed to find tablespace for table `test`\\.`t` in the cache");
call mtr.add_suppression("\\[Warning\\] InnoDB: Allocated tablespace ID.* for test/t, old maximum was 0");
FLUSH TABLES;
--enable_query_log

--connect(con1, localhost, root)
CREATE TABLE t(a INT PRIMARY KEY) ENGINE=InnoDB;
INSERT INTO t VALUES(1);
BEGIN;
# Generate insert_undo log.
INSERT INTO t VALUES(2);
# Generate update_undo log.
UPDATE t SET a=20 WHERE a=2;
--connect(con2, localhost, root)
--echo # Normal MariaDB shutdown would roll back the above transaction.
--echo # We want the transaction to remain open, so we will kill the server
--echo # after ensuring that any non-transactional files are clean.
FLUSH TABLES;
--echo # Create another transaction that will be recovered as COMMITTED.
BEGIN;
# Generate multiple pages of both insert_undo and update_undo, so that
# the state TRX_UNDO_CACHE will not be chosen.
--disable_query_log
let $n= 10000;
while ($n) {
dec $n;
eval INSERT INTO t VALUES(-$n);
eval DELETE FROM t WHERE a=-$n;
}
--enable_query_log
SET DEBUG_SYNC='after_trx_committed_in_memory SIGNAL committed WAIT_FOR ever';
send COMMIT;

connection default;
SET DEBUG_SYNC='now WAIT_FOR committed';
--echo # Ensure that the above transactions become durable.
SET GLOBAL innodb_flush_log_at_trx_commit=1;
BEGIN;
INSERT INTO t VALUES(-10000);
ROLLBACK;
--let $restart_parameters= --innodb-force-recovery=3
--let $shutdown_timeout= 0
--source include/restart_mysqld.inc
--let $shutdown_timeout= 30
--disconnect con1
--disconnect con2
SELECT * FROM t;
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
SELECT * FROM t;
# refused on MySQL 5.6, MariaDB 10.0, 10.1, but not MariaDB 10.2+
UPDATE t SET a=3 WHERE a=1;
--let $restart_parameters= --innodb-read-only
--source include/restart_mysqld.inc
--echo # Starting with MariaDB 10.2, innodb_read_only implies READ UNCOMMITTED.
--echo # In earlier versions, this would return the last committed version
--echo # (only a=3; no record for a=20)!
SELECT * FROM t;
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
SELECT * FROM t;
--let $restart_parameters= --innodb-force-recovery=5
--source include/restart_mysqld.inc
--echo #
--echo # MDEV-15418 innodb_force_recovery=5 displays bogus warnings
--echo #            about too new transaction identifier
--echo #
--echo # With the fix, innodb_force_recovery=5 implies READ UNCOMMITTED.
SELECT * FROM t;
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
SELECT * FROM t;
SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
SELECT * FROM t;
--let $restart_parameters=
--source include/restart_mysqld.inc
SELECT * FROM t;
DROP TABLE t;
let SEARCH_FILE= $MYSQLTEST_VARDIR/log/mysqld.1.err;
--let SEARCH_PATTERN= Rolled back recovered transaction [^0]
--source include/search_pattern_in_file.inc