lp:~laurynas-biveinis/percona-server/26611-bug917942-5.1

Created by Laurynas Biveinis on 2012-10-16 and last modified on 2012-10-16
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486. By Laurynas Biveinis on 2012-10-16

Fix bug 917942 (fake-changes infinite loop on update, allocates many
extents).

The bug was reported by, and the fix and testcase are adopted from
Facebook MySQL branch, revision 3787 of lp:mysqlatfacebook/51.

The issue is btr_cur_pessimistic_update() has uninitialized
cursor->tree_height when fake changes enabled, which is then used to
compute the number of extents to allocate. Other similar functions
(btr_cur_pessimistic_insert() and btr_cur_pessimistic_delete()) seem
to be unaffected.

Fixed by initializing cursor->tree_height to ULINT_UNDEFINED in
btr_pcur_create_for_mysql(), testing for this value in
btr_cur_pessimistic_update() and allocating 3 extents in the case of
fake changes. Added checks in btr_cur_pessimistic_insert() and
btr_cur_pessimistic_delete() that tree_height != ULINT_UNDEFINED.

Make btr_cur_update_alloc_zip() not call
page_zip_compress_write_log_no_data() as fake transactions should not
write to log and to avoid hitting asserts. For that, pass trx to the
former and update all callers.

Add a testcase for the bug.

485. By Laurynas Biveinis on 2012-10-11

Automerge prerequisite branch

484. By Hrvoje Matijakovic on 2012-10-05

* bug fix for Bug #1054090

483. By Stewart Smith on 2012-10-02

merge fix for: Bug #1046389: UNIV_DEBUG build broken

481. By Stewart Smith on 2012-09-05

merge 5.1.65-14.0 release branch

480. By Stewart Smith on 2012-09-05

merge Bug #747032: Flashcache throws an error on startup when flashcache is not used

479. By Stewart Smith on 2012-09-05

merge fix for Bug #902471: Lots of ssl tests failures on oneiric hosts

478. By Stewart Smith on 2012-09-05

merge fix for Bug #1039931: 64-bit atomic operation Autoconf tests duplicated in regular atomic operation tests

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