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Revision 0d4a2b733070a1bd52f981313f9e17f126701407 authored by Yi Wu on 04 August 2017, 20:09:56 UTC, committed by Facebook Github Bot on 04 August 2017, 20:12:07 UTC 
Avoid blob db call Sync() while writing
 
Summary:
The FsyncFiles background job call Fsync() periodically for blob files. However it can access WritableFileWriter concurrently with a Put() or Write(). And WritableFileWriter does not support concurrent access. It will lead to WritableFileWriter buffer being flush with same content twice, and blob file end up corrupted. Fixing by simply let FsyncFiles hold write_mutex_.
Closes https://github.com/facebook/rocksdb/pull/2685

Differential Revision: D5561908

Pulled By: yiwu-arbug

fbshipit-source-id: f0bb5bcab0e05694e053b8c49eab43640721e872
1 parent 627c9f1
Raw File
memory_usage.h 
//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under both the GPLv2 (found in the
//  COPYING file in the root directory) and Apache 2.0 License
//  (found in the LICENSE.Apache file in the root directory).

#pragma once

#include <unordered_map>

namespace rocksdb {

// Helper methods to estimate memroy usage by std containers.

template <class Key, class Value, class Hash>
size_t ApproximateMemoryUsage(
    const std::unordered_map<Key, Value, Hash>& umap) {
  typedef std::unordered_map<Key, Value, Hash> Map;
  return sizeof(umap) +
         // Size of all items plus a next pointer for each item.
         (sizeof(typename Map::value_type) + sizeof(void*)) * umap.size() +
         // Size of hash buckets.
         umap.bucket_count() * sizeof(void*);
}

}  // namespace rocksdb
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