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Modified description of topology manager
author Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
date Wed, 22 Jan 2014 18:35:23 +0900
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1 \chapter{Jungleの分散実装}
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2 \section{TreeOperationLogを用いての分散データベースの実装}
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3 Jungle でデータ扱うと TreeOperationLog として残ることは述べた.
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4 この TreeOperationLog を他のサーバへと送り, Jungle の編集を行って
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5 貰うことでデータの分散を行うことができる.
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6 ここで問題になることはネットワークトポロジーの形成方法であった.
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8 Jungle で使用するネットワークトポロジーはツリー型を考えている.
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9 しかし, リング型といった他のネットワークトポロジーによる実装に関しても試す余地はある.
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10 自由にネットワークトポロジーの形成を行うことができる必要があった.
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12 そこで当研究室で開発を行っている並列分散フレームワークである Alice を使用することにした.
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13 Alice により提供されるネットワークトポロジー形成を用いて TreeOperationLog を各サーバノードへ
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14 配ることで並列分散フレームワークの実装を行う.
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16 % トポロジー形成の説明をする. 重要さなども。
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17 % トポロジーの形成は容易ではない.
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18 % Alice が必要な機能を提供してくれることを述べる
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19 % Alice はトポロジー形成の機能を提供している
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20 % トポロジー間でのデータの受け渡す機能も提供している
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21 \begin{figure}[htpb]
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22 \begin{minipage}{0.5\hsize}
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23 \begin{center}
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24 \includegraphics[scale=0.7]{figures/network_topology_ring.pdf}
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25 \caption{リング型のNetwork Topology}
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26 \label{fig:topology_ring}
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27 \end{center}
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28 \end{minipage}
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29 \begin{minipage}{0.5\hsize}
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30 \begin{center}
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31 \includegraphics[scale=0.7]{figures/network_topology_tree.pdf}
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32 \caption{ツリー型のNetwork Topology}
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33 \label{fig:topology_tree}
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34 \end{center}
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35 \end{minipage}
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36 \end{figure}
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38 \section{並列分散フレームワークAlice}
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39 Alice は当研究室で開発している並列分散フレームワークである.
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40 Alice はデータを DataSegment, コードを CodeSegment という単位で扱うプログラミングを提供している.
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41 DataSegment として扱われるデータは
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42
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45 % DataSegment, CodeSegment はなしにしたほうがいいかもしれない. Alice が論文の主題じゃないから
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46 % それとこの2つの説明をするとしたら結構な量になる
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47
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48 \section{Aliceによるトポロジーの形成}
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49 Alice はサーバノードによるネットワークトポロジー形成の機能を持つ.
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50 トポロジーの内容は dot ファイルに記述される.
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51 以下に, サーバノードの数が5で, 2分木ツリー構造を形成する dot ファイル
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52 の例を\ref{src:alice_dot}に示す.
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53 \begin{lstlisting}[frame=lrbt,label=src:alice_dot,caption=ネットワークトポロジー設定用 dot ファイル,numbers=left]
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54 % cat tree5.dot
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55 digraph test {
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56 node0 -> node1 [label="child1"]
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57 node0 -> node2 [label="child2"]
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58 node1 -> node0 [label="parent"]
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59 node1 -> node3 [label="child1"]
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60 node1 -> node4 [label="child2"]
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61 node2 -> node0 [label="parent"]
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62 node3 -> node1 [label="parent"]
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63 node4 -> node1 [label="parent"]
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64 }
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65 \end{lstlisting}
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66
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67 Alice のトポロジーマネージャーを起動する場合に\ref{src:alice_dot}のファイルを引数として渡すことでトポロジー形成の
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68 準備は整う(\ref{alice_ntm_run}).
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69 \begin{lstlisting}[frame=lrbt,label=src:alice_ntm_run,caption=Alice によるネットワークトポロジーマネージャーの起動,numbers=left]
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70 % java -cp Alice.jar alice.topology.manager.TopologyManager -p 10000 -conf /home/one/hg/nobuyasu/workspace/scripts/topology/tree5.dot
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71 \end{lstlisting}h
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75 \begin{lstlisting}[frame=lrbt,label=src:create_jungle,caption=Alice を使用してのトポロジー形成,numbers=left]
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76 public static void main( String[] args ) throws Exception
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77 {
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78 RemoteConfig conf = new RemoteConfig(args);
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79 new TopologyNode(conf, new StartBBSCodeSegment(args, conf.bbsPort));
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80 }
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81 \end{lstlisting}
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82
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83
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84
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85 トポロジーマネージャーは dot ファイルを読み込み, 接続要求をしてくるサーバノード
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86 に, どのサーバノードにつなげればよいかを教える.
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87 サーバノードには番号が割り振られ, 接続要求が先にきたもの程若い番号が割り当てられる.
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88 これにより形成されるトポロジーを図\ref{fig:tree_topology}に示す.
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89
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90 \begin{figure}[htpb]
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91 \begin{center}
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92 \includegraphics[scale=0.70]{figures/tree_topology.pdf}
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93 \caption{Alice によるネットワークトポロジー形成}
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94 \label{fig:tree_topology}
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95 \end{center}
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96 \end{figure}
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97
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98 矢印に書かれている文字列は, 相手のデータにアクセスするキーを示す.
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99 "child1", "child2", "parent" というキーを使うことで別のサーバノードにあるデータを取得することができる.
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100 %子共となるノードは "parent" キーにより親の DSM (Remote DSM) にアクセスすることができる.
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101 %また, 親も子供となるノードの DSM に対して "child1" や "child2" キーによりアクセスすることが可能となる.
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102
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103 \subsection{トポロジー用 dot ファイル形成スクリプト}
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104 Alice ではトポロジー形成用スクリプトが用意されている.
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105 ノードの数と子供の数を指定するだけで dot ファイルの作成が行える.
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106 また, ツリーに限らずリングやメッシュといったトポロジーの形成も行うことができる.
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107
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108 % MessagePackの説明もここに簡単に入れたほうがいいかも.
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109
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110 \section{Aliceを用いての分散実装}
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111 Alice によりトポロジーの形成を行うことができれば, 後はデータの送受信を行う部分の実装になる.
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112
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113
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114 \section{ログのシリアライズ}
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115
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116 ログのシリアライズについて述べる.
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117 シリアライズとは, データをネットワーク上に流しても良い形式に変換することである.
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118
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119
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120 \section{Jungleの永続性の実装}
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121 \subsection{マージの実装}
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122