Bug#13636122 THE ORIGINAL TABLE MISSING WHILE EXECUTE THE DDL 'ALTER TABLE ADD COLUMN

rb://914
approved by: Marko Makela

Poll in fil_rename_tablespace() after setting ::stop_ios flag can
result in a hang because the other thread actually dispatching the IO
won't wake IO helper threads or flush the tablespace before starting
wait in fil_mutex_enter_and_prepare_for_io().

storage/innobase/fil/fil0fil.c

@@ -772,11 +772,6 @@ fil_mutex_enter_and_prepare_for_io(
 		return;
 	}
 
-	if (system->n_open < system->max_n_open) {
-
-		return;
-	}
-
 	HASH_SEARCH(hash, system->spaces, space_id, space,
 		    space->id == space_id);
 	if (space != NULL && space->stop_ios) {
@@ -793,6 +788,18 @@ fil_mutex_enter_and_prepare_for_io(
 
 		mutex_exit(&(system->mutex));
 
+#ifndef UNIV_HOTBACKUP
+		/* Wake the i/o-handler threads to make sure pending
+		i/o's are performed */
+		os_aio_simulated_wake_handler_threads();
+
+		os_thread_sleep(20000);
+#endif /* UNIV_HOTBACKUP */
+
+		/* Flush tablespaces so that we can close modified
+		files in the LRU list */
+		fil_flush_file_spaces(FIL_TABLESPACE);
+
 		os_thread_sleep(20000);
 
 		count2++;
@@ -800,6 +807,11 @@ fil_mutex_enter_and_prepare_for_io(
 		goto retry;
 	}
 
+	if (system->n_open < system->max_n_open) {
+
+		return;
+	}
+
 	/* If the file is already open, no need to do anything; if the space
 	does not exist, we handle the situation in the function which called
 	this function */
@@ -2290,7 +2302,7 @@ fil_rename_tablespace(
 retry:
 	count++;
 
-	if (count > 1000) {
+	if (!(count % 1000)) {
 		ut_print_timestamp(stderr);
 		fputs("  InnoDB: Warning: problems renaming ", stderr);
 		ut_print_filename(stderr, old_name);

storage/innodb_plugin/ChangeLog

+2012-01-30	The InnoDB Team
+
+	* fil/fil0fil.c:
+	Fix Bug#13636122 THE ORIGINAL TABLE MISSING WHILE EXECUTE THE
+	DDL 'ALTER TABLE ADD COLUMN'
+
 2012-01-16	The InnoDB Team
 
 	* ibuf/ibuf0ibuf.c:

storage/innodb_plugin/fil/fil0fil.c

@@ -918,11 +918,6 @@ fil_mutex_enter_and_prepare_for_io(
 		return;
 	}
 
-	if (fil_system->n_open < fil_system->max_n_open) {
-
-		return;
-	}
-
 	space = fil_space_get_by_id(space_id);
 
 	if (space != NULL && space->stop_ios) {
@@ -939,6 +934,25 @@ fil_mutex_enter_and_prepare_for_io(
 
 		mutex_exit(&fil_system->mutex);
 
+#ifndef UNIV_HOTBACKUP
+
+		/* Wake the i/o-handler threads to make sure pending
+		i/o's are performed */
+		os_aio_simulated_wake_handler_threads();
+
+		/* The sleep here is just to give IO helper threads a
+		bit of time to do some work. It is not required that
+		all IO related to the tablespace being renamed must
+		be flushed here as we do fil_flush() in
+		fil_rename_tablespace() as well. */
+		os_thread_sleep(20000);
+
+#endif /* UNIV_HOTBACKUP */
+
+		/* Flush tablespaces so that we can close modified
+		files in the LRU list */
+		fil_flush_file_spaces(FIL_TABLESPACE);
+
 		os_thread_sleep(20000);
 
 		count2++;
@@ -946,6 +960,11 @@ fil_mutex_enter_and_prepare_for_io(
 		goto retry;
 	}
 
+	if (fil_system->n_open < fil_system->max_n_open) {
+
+		return;
+	}
+
 	/* If the file is already open, no need to do anything; if the space
 	does not exist, we handle the situation in the function which called
 	this function */
@@ -2496,7 +2515,7 @@ fil_rename_tablespace(
 retry:
 	count++;
 
-	if (count > 1000) {
+	if (!(count % 1000)) {
 		ut_print_timestamp(stderr);
 		fputs("  InnoDB: Warning: problems renaming ", stderr);
 		ut_print_filename(stderr, old_name);