database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-08-08 11:22:35 +03:00
Code Activity

MDEV-22242 B-trees can become extremely skewed

Browse Source 
The test innodb.innodb_wl6326 that had been disabled in 10.4 due to
MDEV-21535 is failing on 10.5 due to a different reason: the removal
of the MLOG_COMP_END_COPY_CREATED operations in MDEV-12353
commit 276f996af9 caused PAGE_LAST_INSERT
to be set to something nonzero by the function page_copy_rec_list_end().

This in turn would cause btr_page_get_split_rec_to_right() to behave
differently: we would not attempt to split the page at all, but simply
insert the new record into the new, empty, right leaf page.

Even though the change reduced the sizes of some tables, it is better
to aim for balanced trees.

page_copy_rec_list_end(), PageBulk::finishPage():
Preserve PAGE_LAST_INSERT, PAGE_N_DIRECTION, PAGE_DIRECTION.

PageBulk::finish(): Move some common code from PageBulk::finishPage().
This commit is contained in:
Marko Mäkelä
2020-04-14 18:43:03 +03:00
parent 87a7968c23
commit 2f7d91bb6c
20 changed files with 272 additions and 282 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
mysql-test/suite/encryption/r/innodb-discard-import-change.result
View File

@@ -100,5 +100,5 @@ NOT FOUND /verysecretmessage/ in t3.ibd
# t4 page compressed and encrypted expecting NOT FOUND
NOT FOUND /verysecretmessage/ in t4.ibd
# t5 normal expecting FOUND
FOUND 256 /verysecretmessage/ in t5.ibd
FOUND 289 /verysecretmessage/ in t5.ibd
DROP TABLE t1,t2,t3,t4,t5,t6;