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add seeforprev in history

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Summary: update new feature in history and avoid breaking mongorocks

Test Plan: make check

Reviewers: sdong, yiwu, andrewkr

Reviewed By: andrewkr

Subscribers: andrewkr, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D64611
This commit is contained in:
Aaron Gao 2016-10-17 15:34:13 -07:00
parent 5027dd17a7
commit d88dff4ef2
2 changed files with 4 additions and 1 deletions
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3
HISTORY.md
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@ -7,6 +7,9 @@
### New Features
* Add DB::SetDBOptions() to dynamic change base_background_compactions and max_background_compactions.
### New Features
* Added Iterator::SeekForPrev(). This new API will seek to the last key that less than or equal to the target key.
## 4.12.0 (9/12/2016)
### Public API Change
* CancelAllBackgroundWork() flushes all memtables for databases containing writes that have bypassed the WAL (writes issued with WriteOptions::disableWAL=true) before shutting down background threads.

2
include/rocksdb/iterator.h
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@ -72,7 +72,7 @@ class Iterator : public Cleanable {
// Position at the last key in the source that at or before target
// The iterator is Valid() after this call iff the source contains
// an entry that comes at or before target.
virtual void SeekForPrev(const Slice& target) = 0;
virtual void SeekForPrev(const Slice& target) {}
// Moves to the next entry in the source. After this call, Valid() is
// true iff the iterator was not positioned at the last entry in the source.