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Revision df5eeb85caf76a2f038d4029f95de36b91ee0054 authored by Yi Wu on 13 November 2016, 21:00:52 UTC, committed by Facebook Github Bot on 13 November 2016, 21:09:16 UTC 
Optimize sequential insert into memtable - Part 2: Implementation
 
Summary:
Implement a insert hint into skip-list to hint insert position. This is
to optimize for the write workload where there are multiple stream of
sequential writes. For example, there is a stream of keys of a1, a2,
a3... but also b1, b2, b2... Each stream are not neccessary strictly
sequential, but can get reorder a little bit. User can specify a prefix
extractor and the `SkipListRep` can thus maintan a hint for each of the
stream for fast insert into memtable.

This is the internal implementation part. See #1419 for the interface part.
See inline comments for details.
Closes https://github.com/facebook/rocksdb/pull/1449

Differential Revision: D4106781

Pulled By: yiwu-arbug

fbshipit-source-id: f4d48c4
1 parent 5ed6508
Raw File
string_util.h 
//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under the BSD-style license found in the
//  LICENSE file in the root directory of this source tree. An additional grant
//  of patent rights can be found in the PATENTS file in the same directory.
//

#pragma once

#include <sstream>
#include <string>
#include <vector>

namespace rocksdb {

extern std::vector<std::string> StringSplit(const std::string& arg, char delim);

template <typename T>
inline std::string ToString(T value) {
#if !(defined OS_ANDROID) && !(defined CYGWIN) && !(defined OS_FREEBSD)
  return std::to_string(value);
#else
  // Andorid or cygwin doesn't support all of C++11, std::to_string() being
  // one of the not supported features.
  std::ostringstream os;
  os << value;
  return os.str();
#endif
}

}  // namespace rocksdb
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