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Very basic Multiget and simple test cases.

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Summary:
Implemented the MultiGet operator which takes in a list of keys
and returns their associated values. Currently uses std::vector as its
container data structure. Otherwise, it works identically to "Get".

Test Plan:
 1. make db_test      ; compile it
 2. ./db_test         ; test it
 3. make all check    ; regress / run all tests
 4. make release      ; (optional) compile with release settings

Reviewers: haobo, MarkCallaghan, dhruba

Reviewed By: dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D10875
This commit is contained in:
Deon Nicholas
2013-06-05 11:22:38 -07:00
parent d91b42ee27
commit d8c7c45ea0
7 changed files with 180 additions and 7 deletions
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14
include/leveldb/db.h
View File

@@ -106,6 +106,20 @@ class DB {
virtual Status Get(const ReadOptions& options,
const Slice& key, std::string* value) = 0;
// If keys[i] does not exist in the database, then the i'th returned
// status will be one for which Status::IsNotFound() is true, and
// (*values)[i] will be set to some arbitrary value (often ""). Otherwise,
// the i'th returned status will have Status::ok() true, and (*values)[i]
// will store the value associated with keys[i].
//
// (*values) will always be resized to be the same size as (keys).
// Similarly, the number of returned statuses will be the number of keys.
// Note: keys will not be "de-duplicated". Duplicate keys will return
// duplicate values in order.
virtual std::vector<Status> MultiGet(const ReadOptions& options,
const std::vector<Slice>& keys,
std::vector<std::string>* values) = 0;
// Return a heap-allocated iterator over the contents of the database.
// The result of NewIterator() is initially invalid (caller must
// call one of the Seek methods on the iterator before using it).

13
include/leveldb/statistics.h
View File

@@ -47,8 +47,15 @@ enum Tickers {
// write throttle because of too many files in L0
STALL_L0_NUM_FILES_MICROS = 15,
RATE_LIMIT_DELAY_MILLIS = 16,
NO_ITERATORS = 17, // number of iterators currently open
TICKER_ENUM_MAX = 18
// Number of MultiGet calls, keys read, and bytes read
NUMBER_MULTIGET_CALLS = 18,
NUMBER_MULTIGET_KEYS_READ = 19,
NUMBER_MULTIGET_BYTES_READ = 20,
TICKER_ENUM_MAX = 21
};
@@ -66,8 +73,8 @@ enum Histograms {
COMPACTION_OUTFILE_SYNC_MICROS = 4,
WAL_FILE_SYNC_MICROS = 5,
MANIFEST_FILE_SYNC_MICROS = 6,
HISTOGRAM_ENUM_MAX = 7
DB_MULTIGET = 7,
HISTOGRAM_ENUM_MAX = 8
};
struct HistogramData {