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[Performance Branch] PlainTable to encode rows with seqID 0, value type using 1 internal byte.

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Summary: In PlainTable, use one single byte to represent 8 bytes of internal bytes, if seqID = 0 and it is value type (which should be common for bottom most files). It is to save 7 bytes for uncompressed cases.

Test Plan: make all check

Reviewers: haobo, dhruba, kailiu

Reviewed By: haobo

CC: igor, leveldb

Differential Revision: https://reviews.facebook.net/D15489
This commit is contained in:
Siying Dong
2014-01-27 13:53:22 -08:00
parent 4f6cb17bdb
commit d169b67680
41 changed files with 592 additions and 409 deletions
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29
db/table_cache.h
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@@ -38,8 +38,8 @@ class TableCache {
// the returned iterator. The returned "*tableptr" object is owned by
// the cache and should not be deleted, and is valid for as long as the
// returned iterator is live.
Iterator* NewIterator(const ReadOptions& options,
const EnvOptions& toptions,
Iterator* NewIterator(const ReadOptions& options, const EnvOptions& toptions,
const InternalKeyComparator& internal_comparator,
const FileMetaData& file_meta,
TableReader** table_reader_ptr = nullptr,
bool for_compaction = false);
@@ -48,26 +48,27 @@ class TableCache {
// call (*handle_result)(arg, found_key, found_value) repeatedly until
// it returns false.
Status Get(const ReadOptions& options,
const FileMetaData& file_meta,
const Slice& k,
void* arg,
bool (*handle_result)(void*, const Slice&, const Slice&, bool),
bool* table_io,
void (*mark_key_may_exist)(void*) = nullptr);
const InternalKeyComparator& internal_comparator,
const FileMetaData& file_meta, const Slice& k, void* arg,
bool (*handle_result)(void*, const ParsedInternalKey&,
const Slice&, bool),
bool* table_io, void (*mark_key_may_exist)(void*) = nullptr);
// Determine whether the table may contain the specified prefix. If
// the table index or blooms are not in memory, this may cause an I/O
bool PrefixMayMatch(const ReadOptions& options, uint64_t file_number,
uint64_t file_size, const Slice& internal_prefix,
bool* table_io);
bool PrefixMayMatch(const ReadOptions& options,
const InternalKeyComparator& internal_comparator,
uint64_t file_number, uint64_t file_size,
const Slice& internal_prefix, bool* table_io);
// Evict any entry for the specified file number
void Evict(uint64_t file_number);
// Find table reader
Status FindTable(const EnvOptions& toptions, uint64_t file_number,
uint64_t file_size, Cache::Handle**, bool* table_io=nullptr,
const bool no_io = false);
Status FindTable(const EnvOptions& toptions,
const InternalKeyComparator& internal_comparator,
uint64_t file_number, uint64_t file_size, Cache::Handle**,
bool* table_io = nullptr, const bool no_io = false);
// Get TableReader from a cache handle.
TableReader* GetTableReaderFromHandle(Cache::Handle* handle);