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mdbx: backport - ITS#8321 a lot for cursor tracking.

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Multiple bugs were fixed in the cursor fixups which
adjust other open cursors in response to various write ops.

Includes:

 - ITS#8321 Fix del/dupsort.
   When deleting a dupsort key, if other cursors pointed at that key,
   set them to uninit'd, not EOF. They no longer have anything to
   point at.

 - ITS#8321 don't skip fixups on splitting cursors.
   Adjustments can't be skipped, in recursive calls each level must
   fixup their own level.

 - ITS#8321 fix mdb_cursor_chk().
   It was reporting spurious errors due to uninit'd cursors

 - ITS#8321 fix mdb_cursor_shadow().
   Set a valid txn so that cursor fixup code works on the shadows

 - ITS#8321 fix mdb_cursor_put.
   Ignore sub-cursors that shouldn't be fixed up

 - ITS#8321 track temporary cursors.
   In rebalance/split operations, temporary cursors need to be visible
   to propagate fixups

 - ITS#8321 simplify page_split fixups.

 - ITS#8321 reorganize page_split fixups.
   DUPFIXED fixups needed to occur after separator update.
   MDB_RESERVE handling moved after split fixup.

Change-Id: I0c04acf54ebf6e84f32996b5723ec6fafb983ad9
This commit is contained in:
Leo Yuriev
2015-11-23 09:29:01 +03:00
parent 0a97fbcbab
commit aeea7ebb08
2 changed files with 79 additions and 45 deletions
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@@ -21,6 +21,7 @@ LMDB 0.9.17 Release Engineering
Fix ITS#8313 mdb_rebalance dummy cursor
Fix ITS#8315 dirty_room in nested txn
Fix ITS#8316 page_merge cursor tracking
Fix ITS#8321 cursor tracking
Added mdb_txn_id() (ITS#7994)
Added robust mutex support
Miscellaneous cleanup/simplification