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MDEV-6076: Preserve PAGE_ROOT_AUTO_INC when emptying pages.

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Thanks to Zhangyuan from Alibaba for pointing out this bug.

btr_page_empty(): When a clustered index root page is emptied,
preserve PAGE_ROOT_AUTO_INC. This would occur during a page split.

page_create_empty(): Preserve PAGE_ROOT_AUTO_INC when a clustered
index root page becomes empty. Use a faster method for writing
the field.

page_zip_copy_recs(): Reset PAGE_MAX_TRX_ID when copying
clustered index pages. We must clear the field when the root page
was a leaf page and it is being split, so that PAGE_MAX_TRX_ID
will continue to be 0 in clustered index non-root pages.

page_create_zip(): Add debug assertions for validating
PAGE_MAX_TRX_ID and PAGE_ROOT_AUTO_INC.
This commit is contained in:
Marko Mäkelä
2016-12-15 18:51:41 +02:00
parent cb0ce5c2e9
commit c64edc6b83
5 changed files with 85 additions and 14 deletions
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21
mysql-test/suite/innodb/t/autoinc_persist.test
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@ -382,6 +382,23 @@ ALTER TABLE mdev6076a ADD COLUMN a SERIAL FIRST, LOCK=NONE;
ALTER TABLE mdev6076a ADD COLUMN a SERIAL FIRST, ALGORITHM=INPLACE;
ALTER TABLE mdev6076b ADD COLUMN a SERIAL FIRST, AUTO_INCREMENT=100,
ALGORITHM=INPLACE;
--echo # MDEV-6076: Test root page split and page_create_empty()
CREATE TABLE mdev6076empty (b SERIAL, pad CHAR(255) NOT NULL DEFAULT '')
ENGINE=InnoDB;
BEGIN;
--echo # Insert records in descending order of AUTO_INCREMENT,
--echo # causing a page split on the very last insert.
--echo # Without the fix in btr_page_empty() this would lose the counter value.
--echo # Without the fix in page_create_empty() the counter value would be lost
--echo # when ROLLBACK deletes the last row.
--disable_query_log
let $i= 55;
while ($i) {
eval INSERT INTO mdev6076empty SET b=$i;
dec $i;
}
--enable_query_log
ROLLBACK;
--source include/kill_and_restart_mysqld.inc
@ -392,7 +409,9 @@ INSERT INTO mdev6076a SET b=NULL;
SELECT * FROM mdev6076a;
INSERT INTO mdev6076b SET b=NULL;
SELECT * FROM mdev6076b;
DROP TABLE mdev6076a, mdev6076b;
INSERT INTO mdev6076empty SET b=NULL;
SELECT * FROM mdev6076empty;
DROP TABLE mdev6076a, mdev6076b, mdev6076empty;
INSERT INTO t3 VALUES(0), (0), (200), (210);