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Backport an InnoDB Bug #58815 (Bug #11765812) work-around from mysql-trunk:

Browse Source 
------------------------------------------------------------
revno 2876.244.305
revision id marko.makela@oracle.com-20110413082211-e6ouhjz5rmqxcqap
parent  marko.makela@oracle.com-20110413075948-kvytmc37ye1nt7d9
committer  Marko Mäkelä <marko.makela@oracle.com>
branch nick 5.6-innodb
timestamp Wed 2011-04-13 11:22:11 +0300
message:
  Suppress the Bug #58815 (Bug #11765812) assertion failure.

  buf_page_get_gen(): Introduce BUF_GET_POSSIBLY_FREED for suppressing the
  check that the file page must not have been freed.

  btr_estimate_n_rows_in_range_on_level(): Pass BUF_GET_POSSIBLY_FREED and
  explain in the comments why this is needed and why it should be mostly
  harmless to ignore the problem. If InnoDB had always initialized all
  unused fields in data files, no problem would exist.

  This change does not fix the bug, it just "shoots the messenger".

  rb:647 approved by Jimmy Yang
This commit is contained in:
Marko Mäkelä
2011-05-24 11:41:31 +03:00
parent 79f8d024b8
commit 34e5d4740e
3 changed files with 23 additions and 8 deletions
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3
storage/innobase/include/buf0buf.h
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@ -53,6 +53,9 @@ Created 11/5/1995 Heikki Tuuri
/*!< Get the page only if it's in the
buffer pool, if not then set a watch
on the page. */
#define BUF_GET_POSSIBLY_FREED 16
/*!< Like BUF_GET, but do not mind
if the file page has been freed. */
/* @} */
/** @name Modes for buf_page_get_known_nowait */
/* @{ */