Revision 3df07d1703297cf8bf98327c1dc65f48d18957f5 authored by sdong on 19 May 2014, 17:40:18 UTC, committed by sdong on 19 May 2014, 18:52:12 UTC
Summary: Add a feature to decrease the number of threads in thread pool. Also instantly schedule more threads if number of threads is increased. Here is the way it is implemented: each background thread needs its thread ID. After decreasing number of threads, all threads are woken up. The thread with the largest thread ID will terminate. If there are more threads to terminate, the thread will wake up all threads again. Another change is made so that when number of threads is increased, more threads are created and all previous excessive threads are woken up to do the work. Test Plan: Add a unit test. Reviewers: haobo, dhruba Reviewed By: haobo CC: yhchiang, igor, nkg-, leveldb Differential Revision: https://reviews.facebook.net/D18675
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log_format.h
// Copyright (c) 2013, 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.
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
//
// Log format information shared by reader and writer.
// See ../doc/log_format.txt for more detail.
#pragma once
namespace rocksdb {
namespace log {
enum RecordType {
// Zero is reserved for preallocated files
kZeroType = 0,
kFullType = 1,
// For fragments
kFirstType = 2,
kMiddleType = 3,
kLastType = 4
};
static const int kMaxRecordType = kLastType;
static const unsigned int kBlockSize = 32768;
// Header is checksum (4 bytes), type (1 byte), length (2 bytes).
static const int kHeaderSize = 4 + 1 + 2;
} // namespace log
} // namespace rocksdb
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