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Check PrefixMayMatch on Seek()

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Summary:
As a follow-up diff for https://reviews.facebook.net/D17805, add
optimization to check PrefixMayMatch on Seek()

Test Plan: make all check

Reviewers: igor, haobo, sdong, yhchiang, dhruba

Reviewed By: haobo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17853
This commit is contained in:
Lei Jin
2014-04-25 12:22:23 -07:00
parent 3995e801ab
commit d642c60bdc
8 changed files with 274 additions and 281 deletions
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12
table/block_based_table_reader.h
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@@ -63,7 +63,7 @@ class BlockBasedTable : public TableReader {
unique_ptr<RandomAccessFile>&& file, uint64_t file_size,
unique_ptr<TableReader>* table_reader);
bool PrefixMayMatch(const Slice& internal_prefix) override;
bool PrefixMayMatch(const Slice& internal_key) override;
// Returns a new iterator over the table contents.
// The result of NewIterator() is initially invalid (caller must
@@ -111,13 +111,9 @@ class BlockBasedTable : public TableReader {
Rep* rep_;
bool compaction_optimized_;
static Iterator* DataBlockReader(void*, const ReadOptions&,
const EnvOptions& soptions,
const InternalKeyComparator& icomparator,
const Slice&, bool for_compaction);
static Iterator* DataBlockReader(void*, const ReadOptions&, const Slice&,
bool* didIO, bool for_compaction = false);
struct BlockEntryIteratorState;
static Iterator* NewDataBlockIterator(Rep* rep, const ReadOptions& ro,
bool* didIO, const Slice& index_value);
// For the following two functions:
// if `no_io == true`, we will not try to read filter/index from sst file