Simplify a WL#6494/WL#7142 test.

The test innodb.log_file_size_checkpoint was originally added to
MySQL 5.7 by me in a bug fix, to fix the interaction of WL#6494
(redo log resizing, introduced in MySQL 5.6) and WL#7142
(data file discovery based on MLOG_FILE_NAME records,
introduced in MySQL 5.7):

commit 70f9ef4e1220827132b50275ca7272f2bcca1864
Author: Marko Mäkelä <marko.makela@oracle.com>
Date:   Wed May 21 13:31:29 2014 +0300

    Bug#18755095 REDO LOG SIZE CHANGE AFTER CRASH RESULTS IN CHECKPOINT AGE
    ERROR MESSAGE

    This is a regression from fixing
    Bug#18730524 REPEATED KILL+RESTART FAILS DUE TO MISSING MLOG_FILE_NAME
    RECORD

    innobase_start_or_create_for_mysql(): Invoke fil_names_clear() before
    creating the "checkpoint" when changing redo log files.

    Approved by Jimmy Yang on IM.

The relevant part of the test is that fil_names_clear() is invoked to
emit an MLOG_CHECKPOINT record before the redo log files are deleted.
In case the server is killed before ib_logfile0 has been deleted,
the old (not-yet-resized) redo log will be treated as valid. We do not
need to create a large number of tables for that.

mysql-test/suite/innodb/r/log_file_name_debug.result

@@ -5,4 +5,10 @@
 SET GLOBAL DEBUG_DBUG='+d,fil_names_write_bogus';
 CREATE TABLE t1(a INT PRIMARY KEY) ENGINE=InnoDB;
 # Kill the server
+SELECT * FROM t1;
+ERROR 42000: Unknown storage engine 'InnoDB'
+FOUND /InnoDB: Tablespace 4294967280 was not found at .*, but there were no modifications either/ in mysqld.1.err
+SELECT * FROM t1;
+ERROR 42000: Unknown storage engine 'InnoDB'
+FOUND /srv_prepare_to_delete_redo_log_files: ib_log: MLOG_CHECKPOINT.* written/ in mysqld.1.err
 DROP TABLE t1;

mysql-test/suite/innodb/r/log_file_size_checkpoint.result

-CREATE DATABASE logtest;
-USE logtest;
-# Kill and restart: --innodb-log-files-in-group=2 --innodb-log-file-size=4M --innodb-buffer-pool-size=50M
-DROP DATABASE logtest;

mysql-test/suite/innodb/t/log_file_name_debug.test

@@ -10,9 +10,15 @@
 
 SET GLOBAL DEBUG_DBUG='+d,fil_names_write_bogus';
 --disable_query_log
+call mtr.add_suppression("InnoDB: Plugin initialization aborted");
+call mtr.add_suppression("Plugin 'InnoDB' init function returned error");
+call mtr.add_suppression("Plugin 'InnoDB' registration as a STORAGE ENGINE failed");
 FLUSH TABLES;
 --enable_query_log
 
+--let $n_logs=`SELECT if(@@innodb_log_files_in_group = 1, 2, 1)`
+--let $resize= --innodb-log-files-in-group=$n_logs --innodb-log-file-size=4M
+
 --source include/no_checkpoint_start.inc
 
 CREATE TABLE t1(a INT PRIMARY KEY) ENGINE=InnoDB;
@@ -20,12 +26,24 @@ CREATE TABLE t1(a INT PRIMARY KEY) ENGINE=InnoDB;
 --let CLEANUP_IF_CHECKPOINT=DROP TABLE t1;
 --source include/no_checkpoint_end.inc
 
+--let $restart_parameters= --debug=d,innodb_log_abort_1 $resize
 --source include/start_mysqld.inc
-
-DROP TABLE t1;
+--error ER_UNKNOWN_STORAGE_ENGINE
+SELECT * FROM t1;
 
 --let SEARCH_FILE = $MYSQLTEST_VARDIR/log/mysqld.1.err
---let SEARCH_PATTERN = InnoDB: Tablespace 4294967280 was not found at .*, but there were no modifications either
---let SEARCH_ABORT = NOT FOUND
 --let SEARCH_RANGE = -50000
+--let SEARCH_PATTERN = InnoDB: Tablespace 4294967280 was not found at .*, but there were no modifications either
 --source include/search_pattern_in_file.inc
+
+--let $restart_parameters= --debug=d,innodb_log_abort_3,ib_log $resize
+--source include/restart_mysqld.inc
+--error ER_UNKNOWN_STORAGE_ENGINE
+SELECT * FROM t1;
+--let SEARCH_PATTERN= srv_prepare_to_delete_redo_log_files: ib_log: MLOG_CHECKPOINT.* written
+--source include/search_pattern_in_file.inc
+
+--let $restart_parameters=
+--source include/restart_mysqld.inc
+DROP TABLE t1;
+

mysql-test/suite/innodb/t/log_file_size_checkpoint.test

---source include/have_innodb.inc
---source include/not_embedded.inc
---source include/no_valgrind_without_big.inc
-
-CREATE DATABASE logtest;
-USE logtest;
-let $n=250;
-let $t=veryLongTableNameToCreateMLOG_FILE_NAMErecords;
-
---disable_query_log
-let $i=$n;
-while ($i)
-{
---eval CREATE TABLE $t$i(a INT PRIMARY KEY) ENGINE=InnoDB;
-dec $i;
-}
-
-# If we set above n to 500, this test case could fail easily, because
-# the inndob buffer pool is too small, some of which would be occupied
-# by the recv*. With n=250, this test case could sporadically fail too.
-# So we have to set buffer pool size to 50M which should be enough for this
-# test case. Once we fix the bug#22179133 and bug#22186325, we should use
-# the default innodb buffer pool(or the smaller one).
-let $restart_parameters = --innodb-log-files-in-group=2 --innodb-log-file-size=4M --innodb-buffer-pool-size=50M;
---source include/kill_and_restart_mysqld.inc
-
-DROP DATABASE logtest;

storage/innobase/srv/srv0start.cc

@@ -421,9 +421,11 @@ create_log_files(
 		DBUG_EXECUTE_IF("innodb_log_abort_6", return(DB_ERROR););
 	}
 
+	DBUG_PRINT("ib_log", ("After innodb_log_abort_6"));
 	ut_ad(!buf_pool_check_no_pending_io());
 
 	DBUG_EXECUTE_IF("innodb_log_abort_7", return(DB_ERROR););
+	DBUG_PRINT("ib_log", ("After innodb_log_abort_7"));
 
 	for (unsigned i = 0; i < srv_n_log_files; i++) {
 		sprintf(logfilename + dirnamelen,
@@ -437,6 +439,7 @@ create_log_files(
 	}
 
 	DBUG_EXECUTE_IF("innodb_log_abort_8", return(DB_ERROR););
+	DBUG_PRINT("ib_log", ("After innodb_log_abort_8"));
 
 	/* We did not create the first log file initially as
 	ib_logfile0, so that crash recovery cannot find it until it
@@ -445,7 +448,7 @@ create_log_files(
 
 	fil_space_t*	log_space = fil_space_create(
 		"innodb_redo_log", SRV_LOG_SPACE_FIRST_ID, 0, FIL_TYPE_LOG,
-		NULL, /* No encryption yet */
+		NULL, /* innodb_encrypt_log works at a different level */
 		true /* this is create */);
 	ut_a(fil_validate());
 	ut_a(log_space != NULL);
@@ -513,6 +516,7 @@ create_log_files_rename(
 	fil_flush(SRV_LOG_SPACE_FIRST_ID);
 
 	DBUG_EXECUTE_IF("innodb_log_abort_9", return(DB_ERROR););
+	DBUG_PRINT("ib_log", ("After innodb_log_abort_9"));
 
 	/* Close the log files, so that we can rename
 	the first one. */
@@ -1348,6 +1352,8 @@ lsn_t
 srv_prepare_to_delete_redo_log_files(
 	ulint	n_files)
 {
+	DBUG_ENTER("srv_prepare_to_delete_redo_log_files");
+
 	lsn_t	flushed_lsn;
 	ulint	pending_io = 0;
 	ulint	count = 0;
@@ -1356,7 +1362,8 @@ srv_prepare_to_delete_redo_log_files(
 		/* Clean the buffer pool. */
 		buf_flush_sync_all_buf_pools();
 
-		DBUG_EXECUTE_IF("innodb_log_abort_1", return(0););
+		DBUG_EXECUTE_IF("innodb_log_abort_1", DBUG_RETURN(0););
+		DBUG_PRINT("ib_log", ("After innodb_log_abort_1"));
 
 		log_mutex_enter();
 
@@ -1426,7 +1433,7 @@ srv_prepare_to_delete_redo_log_files(
 
 	} while (buf_pool_check_no_pending_io());
 
-	return(flushed_lsn);
+	DBUG_RETURN(flushed_lsn);
 }
 
 /********************************************************************
@@ -2346,11 +2353,13 @@ innobase_start_or_create_for_mysql(void)
 
 			DBUG_EXECUTE_IF("innodb_log_abort_3",
 					return(srv_init_abort(DB_ERROR)););
+			DBUG_PRINT("ib_log", ("After innodb_log_abort_3"));
 
 			/* Stamp the LSN to the data files. */
 			err = fil_write_flushed_lsn(flushed_lsn);
 
 			DBUG_EXECUTE_IF("innodb_log_abort_4", err = DB_ERROR;);
+			DBUG_PRINT("ib_log", ("After innodb_log_abort_4"));
 
 			if (err != DB_SUCCESS) {
 				return(srv_init_abort(err));
@@ -2362,6 +2371,7 @@ innobase_start_or_create_for_mysql(void)
 
 			DBUG_EXECUTE_IF("innodb_log_abort_5",
 					return(srv_init_abort(DB_ERROR)););
+			DBUG_PRINT("ib_log", ("After innodb_log_abort_5"));
 
 			/* Free the old log file space. */
 			log_group_close_all();