WebRTCを用いたWebブラウザ間構造化P2Pネットワークの実現
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WebRTC allows for peer-to-peer real-time communication directly between browsers or mobile applications. It defines protocols for browser-to-browser applications including peer connection establishment, data channel creation for exchanging arbitrary data, and media transport such as video chat and file sharing. The document also discusses shortest path algorithms for finding optimal routes between nodes in a graph and using these algorithms for routing data in networks.
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WebRTCを用いた耐故障性の高い
ウェブブラウザ間構造化P2Pネットワークの実現
Webブラウザ同士を直接P2P接続するWebRTC技術を用いたブラウザ間構造化P2Pネットワークの実現手法について述べる．WebRTCには，相手ノードを直接指定してコネクションを確立できない，コネクションの確立にはシグナリングが必要，といった特性がある．本研究では，これらの特性を考慮したブラウザ間コネクション確立方式を提案する．提案するブラウザ間コネクション確立手法はシグナリングに特定のサーバを用いないため，耐故障性とスケーラビリティに優れている．提案手法はコネクション管理ライブラリWebRTC-Managerとして実装した．さらにWebRTC-Managerを用いて，Web環境で動作する双方向リング構築アルゴリズムDDLLweb とキー順序保存型構造化P2PネットワークKirin を実現した．本稿ではこれらの詳細について述べる．
構造化オーバーレイネットワークを用いた条件付きマルチキャストの提案と評価
第27回マルチメディア通信と分散処理ワークショップ (DPSWS2019)で発表したときのスライドです．
（優秀プレゼンテーション賞受賞）
構造化オーバーレイネットワークによって，指定した条件を満たすすべてのノードにメッセージを配送する方法を提案する（条件付きマルチキャストと呼ぶ）．各ノードuはユニークなキー(u.key)およびノードの状態を表す値(u.value)を保持する．条件付きマルチキャストでメッセージを配送するには，配送先のキー範囲rおよび条件を指定する関数matchを指定する．メッセージは(p.key∈r ∧ match(p.value)=true)を満たすすべてのノードpに配送される．提案手法はChord#をベースとした構造を持つ．各ノードが経路表の各エントリに，あるキー区間のノードのvalueを集約した値を保持することで，当該区間内に条件にマッチするノードが存在する可能性がある場合のみメッセージを配送する．本稿では提案手法の詳細と解析および評価について述べる．
高いChurn耐性と検索性能を持つキー順序保存型構造化オーバレイネットワークSuzakuの提案と評価
Abstract
キーの値による範囲検索が可能なキー順序保存型構造化オーバレイネットワークは多くの応用があり，重要性が高い．本研究では，新しいキー順序保存型構造化オーバレイネットワークSuzakuを提案する．Suzakuは，(1)Churn時でも最大検索ホップ数がlog_2 n程度に収まる（nはノード数），(2)キーが大小どちらの方向でも近傍ノードの検索は高速に行える，(3)構造は単純で実装が容易，といった特徴を備える．本稿ではSuzakuの詳細について述べ，シミュレーションによって既存のChord#およびSkip Graphと比較する．
A ``key-order preserving structured overlay network,'' which enables
range queries, has various applications and thus be important. In
this study, we propose a novel key-order preserving structured
overlay network ``Suzaku,'' which has the following properties: (1)
maximum lookup hops is almost log_2 n even in churn situations,
where $n$ is the number of nodes, (2) neighbor search is fast
regardless of the direction of their keys, (3) the structure is
simple and easy to implement. In this paper, we describe the
principles and detailed algorithm of Suzaku. We also show
simulation results comparing Suzaku with existing Chord# and Skip
Graph.
Constructing Distributed Doubly Linked Lists without Distributed Locking
Explains a novel distributed algorithm for constructing distributed doubly linked lists (or bidirectional ring), which are common in structured P2P networks.
This presentation is used at the 2015 IEEE International Conference on Peer-to-Peer Computing (P2P2015).
The paper is available at
<http://www.media.osaka-cu.ac.jp/~k-abe/research/Constructing_Distributed_Doubly_Linked_Lists_without_Distributed_Locking.html>
Author: Kota Abe (Osaka City University/NICT), Mikio Yoshida (BBR Inc.)
Abstract:
A distributed doubly linked list (or bidirectional ring) is a fundamental distributed data structure commonly used in structured peer-to-peer networks. This paper presents DDLL, a novel decentralized algorithm for constructing distributed doubly linked lists. In the absence of failure, DDLL maintains consistency with regard to lookups of nodes, even while multiple nodes are simultaneously being inserted or deleted. Unlike existing algorithms, DDLL adopts a novel strategy based on conflict detection and sequence numbers. A formal description and correctness proofs are given. Simulation results show that DDLL outperforms conventional algorithms in terms of both time and number of messages.
KiZUNA: P2Pネットワークを用いた分散型マイクロブログサービスの実現
現在実装中のP2Pネットワークを用いた分散型マイクロブログサービスKiZUNAの設計について述べる．KiZUNAはサーバを必要としないPure P2P型のシステムとして実現する．メッセージの購読と配送に構造化P2Pネットワークの1つであるSkip Graphを用いたALM(Application Level Multicast)を用いる．また，ハッシュタグ，全文検索，検索ストリーム，複製管理などの方式についても述べる．
This paper describes a design of KiZUNA, a pure P2P-based microblogging service. Subscription and distribution of messages are implemented using ALM (Application Level Multicast) over a skip graph, a structured P2P network. Hashtags, full-text search, search stream, and replica management are also discussed.
論文PDFは http://goo.gl/xoSEPb
P2Pネットワークにおける経路長あるいは経路表サイズの最大値を柔軟に設定可能な経路表構築方式
2013年度情報処理学会関西支部支部大会で発表したものです．
詳細は http://goo.gl/kqu6z3 へ
構造化P2Pネットワークにおけるコンテンツの人気度を考慮したショートカットリンクの生成方法とその評価
構造化P2Pネットワーク上に配置されたコンテンツが検索される頻度は一様ではなく，人気の高いコンテンツを持つノード（ホットなノード）に検索が集中する．このため，ホットなノードに対してショートカットリンクを生成することで，コンテンツの検索時間を短縮する手法が提案されている．本稿では，広い範囲の構造化P2Pネットワークを対象としたショートカットリンク生成法を提案する．提案手法はP2Pネットワーク全体に関する大域的な情報を必要とせず，また，既存の手法よりもショートカット生成のコストが低い．提案手法の有効性はシミュレーションにより評価した．
Considering lookup queries on a structured P2P network,
target contents are not uniformly distributed on the network. On the contrary, some specific nodes have very popular --hot-- contents and receive a large number of queries. Several works propose methods to reduce average search time by creating shortcut links to those hot contents. This paper proposes a method for creating shortcut links that is applicable to variety of structured P2P networks. This method requires no global knowledge of the P2P network and is more efficient than existing works. Effectiveness of the method is experimentally confirmed by simulation.
詳細は http://goo.gl/eSQs1 へ．
Recommended
WebRTCを用いた耐故障性の高い
ウェブブラウザ間構造化P2Pネットワークの実現
Webブラウザ同士を直接P2P接続するWebRTC技術を用いたブラウザ間構造化P2Pネットワークの実現手法について述べる．WebRTCには，相手ノードを直接指定してコネクションを確立できない，コネクションの確立にはシグナリングが必要，といった特性がある．本研究では，これらの特性を考慮したブラウザ間コネクション確立方式を提案する．提案するブラウザ間コネクション確立手法はシグナリングに特定のサーバを用いないため，耐故障性とスケーラビリティに優れている．提案手法はコネクション管理ライブラリWebRTC-Managerとして実装した．さらにWebRTC-Managerを用いて，Web環境で動作する双方向リング構築アルゴリズムDDLLweb とキー順序保存型構造化P2PネットワークKirin を実現した．本稿ではこれらの詳細について述べる．
構造化オーバーレイネットワークを用いた条件付きマルチキャストの提案と評価
第27回マルチメディア通信と分散処理ワークショップ (DPSWS2019)で発表したときのスライドです．
（優秀プレゼンテーション賞受賞）
構造化オーバーレイネットワークによって，指定した条件を満たすすべてのノードにメッセージを配送する方法を提案する（条件付きマルチキャストと呼ぶ）．各ノードuはユニークなキー(u.key)およびノードの状態を表す値(u.value)を保持する．条件付きマルチキャストでメッセージを配送するには，配送先のキー範囲rおよび条件を指定する関数matchを指定する．メッセージは(p.key∈r ∧ match(p.value)=true)を満たすすべてのノードpに配送される．提案手法はChord#をベースとした構造を持つ．各ノードが経路表の各エントリに，あるキー区間のノードのvalueを集約した値を保持することで，当該区間内に条件にマッチするノードが存在する可能性がある場合のみメッセージを配送する．本稿では提案手法の詳細と解析および評価について述べる．
高いChurn耐性と検索性能を持つキー順序保存型構造化オーバレイネットワークSuzakuの提案と評価
Abstract
キーの値による範囲検索が可能なキー順序保存型構造化オーバレイネットワークは多くの応用があり，重要性が高い．本研究では，新しいキー順序保存型構造化オーバレイネットワークSuzakuを提案する．Suzakuは，(1)Churn時でも最大検索ホップ数がlog_2 n程度に収まる（nはノード数），(2)キーが大小どちらの方向でも近傍ノードの検索は高速に行える，(3)構造は単純で実装が容易，といった特徴を備える．本稿ではSuzakuの詳細について述べ，シミュレーションによって既存のChord#およびSkip Graphと比較する．
A ``key-order preserving structured overlay network,'' which enables
range queries, has various applications and thus be important. In
this study, we propose a novel key-order preserving structured
overlay network ``Suzaku,'' which has the following properties: (1)
maximum lookup hops is almost log_2 n even in churn situations,
where $n$ is the number of nodes, (2) neighbor search is fast
regardless of the direction of their keys, (3) the structure is
simple and easy to implement. In this paper, we describe the
principles and detailed algorithm of Suzaku. We also show
simulation results comparing Suzaku with existing Chord# and Skip
Graph.
Constructing Distributed Doubly Linked Lists without Distributed Locking
Explains a novel distributed algorithm for constructing distributed doubly linked lists (or bidirectional ring), which are common in structured P2P networks.
This presentation is used at the 2015 IEEE International Conference on Peer-to-Peer Computing (P2P2015).
The paper is available at
<http://www.media.osaka-cu.ac.jp/~k-abe/research/Constructing_Distributed_Doubly_Linked_Lists_without_Distributed_Locking.html>
Author: Kota Abe (Osaka City University/NICT), Mikio Yoshida (BBR Inc.)
Abstract:
A distributed doubly linked list (or bidirectional ring) is a fundamental distributed data structure commonly used in structured peer-to-peer networks. This paper presents DDLL, a novel decentralized algorithm for constructing distributed doubly linked lists. In the absence of failure, DDLL maintains consistency with regard to lookups of nodes, even while multiple nodes are simultaneously being inserted or deleted. Unlike existing algorithms, DDLL adopts a novel strategy based on conflict detection and sequence numbers. A formal description and correctness proofs are given. Simulation results show that DDLL outperforms conventional algorithms in terms of both time and number of messages.
KiZUNA: P2Pネットワークを用いた分散型マイクロブログサービスの実現
現在実装中のP2Pネットワークを用いた分散型マイクロブログサービスKiZUNAの設計について述べる．KiZUNAはサーバを必要としないPure P2P型のシステムとして実現する．メッセージの購読と配送に構造化P2Pネットワークの1つであるSkip Graphを用いたALM(Application Level Multicast)を用いる．また，ハッシュタグ，全文検索，検索ストリーム，複製管理などの方式についても述べる．
This paper describes a design of KiZUNA, a pure P2P-based microblogging service. Subscription and distribution of messages are implemented using ALM (Application Level Multicast) over a skip graph, a structured P2P network. Hashtags, full-text search, search stream, and replica management are also discussed.
論文PDFは http://goo.gl/xoSEPb
P2Pネットワークにおける経路長あるいは経路表サイズの最大値を柔軟に設定可能な経路表構築方式
2013年度情報処理学会関西支部支部大会で発表したものです．
詳細は http://goo.gl/kqu6z3 へ
構造化P2Pネットワークにおけるコンテンツの人気度を考慮したショートカットリンクの生成方法とその評価
構造化P2Pネットワーク上に配置されたコンテンツが検索される頻度は一様ではなく，人気の高いコンテンツを持つノード（ホットなノード）に検索が集中する．このため，ホットなノードに対してショートカットリンクを生成することで，コンテンツの検索時間を短縮する手法が提案されている．本稿では，広い範囲の構造化P2Pネットワークを対象としたショートカットリンク生成法を提案する．提案手法はP2Pネットワーク全体に関する大域的な情報を必要とせず，また，既存の手法よりもショートカット生成のコストが低い．提案手法の有効性はシミュレーションにより評価した．
Considering lookup queries on a structured P2P network,
target contents are not uniformly distributed on the network. On the contrary, some specific nodes have very popular --hot-- contents and receive a large number of queries. Several works propose methods to reduce average search time by creating shortcut links to those hot contents. This paper proposes a method for creating shortcut links that is applicable to variety of structured P2P networks. This method requires no global knowledge of the P2P network and is more efficient than existing works. Effectiveness of the method is experimentally confirmed by simulation.
詳細は http://goo.gl/eSQs1 へ．
高速な挿入と検索が可能なSkip Graphの改良
第6回広域センサネットワークとオーバレイネットワークに関するワークショップにて発表
http://www.slideshare.net/KotaAbe/presentation-slideshare-16586452 をベースにいくつか評価を追加しています．
Skip Graphをベースとした高速な挿入と検索が可能な構造化オーバレイの提案
本稿では，構造化オーバーレイネットワークの1つであるSkip graphに対して，ノードの挿入時間と検索時間の双方を改善する手法を提案する．Skip graphは複数レベルの双方向連結リストから構成されるが，提案手法では(1)各連結リストにおいて左右のポインタに加え，左方向の複数のノードへのポインタを保持する，(2)各レベルの経路表に上位レベルの連結リストの情報も格納する，といった技法を用いる．提案手法はシミュレーションによって有効性を確認した．
In this paper, we propose techniques to improve insertion and lookup time of skip graphs, a kind of structured overlay network that consist of multiple levels of doubly-linked lists. We introduce several techniques such as (1) each node maintains multiple pointers for leftward nodes in addition to the immediate left and right pointers, and (2) a routing table at each level maintains the information about the linked lists at the next higher level. The effectiveness of the method was experimentally confirmed by simulations.
その他の情報: http://bit.ly/Yw6QJ8
距離が付加された要素集合をコンパクトに表現できるDistance Bloom Filterの提案とP2Pネットワークにおける最短経路探索への応用
P2P ネットワークにおいて重要な機能の1つは，あるデータを検索し，そのデータを持つノードを特定することである．この際，目的のノードに到達するまでの遅延時間をできるだけ小さくできることが望ましいが，従来の多くの手法では，局所的な情報のみを利用して経路を決定するため，必ずしも最短経路が選ばれるわけではない．この問題を解決するため，本稿では，経路ごとの遅延時間を空間効率良く保持できるデータ構造である Distance Bloom Filter，ならびに，これを用いて高い確率で最短経路を選択可能な手法を提案する．また，提案手法を構造化 P2P ネットワークの1つである Skip graph に適用したシミュレーションを行い，その有効性を確認した．
One of the key functions of P2P networks is locating a node that stores target data. This is performed by routing a search message with the key corresponding to the data over the overlay network. Minimizing the latency of this process is not fully achieved by most P2P systems since they only use local information to determine the route. This paper proposes a novel routing method for P2P systems that finds the shortest path to the destination with high probability. Distance Bloom Filter as a space-efficient data structure to store distance information is introduced to support the method. Simulation results of the method applied to skip graphs, a structured P2P network, are also reported.
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岩崎 章彦，安倍 広多，石橋 勇人，松浦 敏雄，区間をキーとして保持する分散 KVS の効率的な実現法，平成23年度情報処理学会関西支部支部大会予稿集，No. F-06，pp. 1-5, (2011-9)．
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a presentation of the DDLL algorithm, which constructs and maintains distributed doubly-linked lists.
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高速な挿入と検索が可能なSkip Graphの改良
第6回広域センサネットワークとオーバレイネットワークに関するワークショップにて発表
http://www.slideshare.net/KotaAbe/presentation-slideshare-16586452 をベースにいくつか評価を追加しています．
Skip Graphをベースとした高速な挿入と検索が可能な構造化オーバレイの提案
本稿では，構造化オーバーレイネットワークの1つであるSkip graphに対して，ノードの挿入時間と検索時間の双方を改善する手法を提案する．Skip graphは複数レベルの双方向連結リストから構成されるが，提案手法では(1)各連結リストにおいて左右のポインタに加え，左方向の複数のノードへのポインタを保持する，(2)各レベルの経路表に上位レベルの連結リストの情報も格納する，といった技法を用いる．提案手法はシミュレーションによって有効性を確認した．
In this paper, we propose techniques to improve insertion and lookup time of skip graphs, a kind of structured overlay network that consist of multiple levels of doubly-linked lists. We introduce several techniques such as (1) each node maintains multiple pointers for leftward nodes in addition to the immediate left and right pointers, and (2) a routing table at each level maintains the information about the linked lists at the next higher level. The effectiveness of the method was experimentally confirmed by simulations.
その他の情報: http://bit.ly/Yw6QJ8
距離が付加された要素集合をコンパクトに表現できるDistance Bloom Filterの提案とP2Pネットワークにおける最短経路探索への応用
P2P ネットワークにおいて重要な機能の1つは，あるデータを検索し，そのデータを持つノードを特定することである．この際，目的のノードに到達するまでの遅延時間をできるだけ小さくできることが望ましいが，従来の多くの手法では，局所的な情報のみを利用して経路を決定するため，必ずしも最短経路が選ばれるわけではない．この問題を解決するため，本稿では，経路ごとの遅延時間を空間効率良く保持できるデータ構造である Distance Bloom Filter，ならびに，これを用いて高い確率で最短経路を選択可能な手法を提案する．また，提案手法を構造化 P2P ネットワークの1つである Skip graph に適用したシミュレーションを行い，その有効性を確認した．
One of the key functions of P2P networks is locating a node that stores target data. This is performed by routing a search message with the key corresponding to the data over the overlay network. Minimizing the latency of this process is not fully achieved by most P2P systems since they only use local information to determine the route. This paper proposes a novel routing method for P2P systems that finds the shortest path to the destination with high probability. Distance Bloom Filter as a space-efficient data structure to store distance information is introduced to support the method. Simulation results of the method applied to skip graphs, a structured P2P network, are also reported.
区間をキーとして保持する分散KVSの効率的な実現法
岩崎 章彦，安倍 広多，石橋 勇人，松浦 敏雄，区間をキーとして保持する分散 KVS の効率的な実現法，平成23年度情報処理学会関西支部支部大会予稿集，No. F-06，pp. 1-5, (2011-9)．
構造化オーバーレイネットワークに適した分散双方向連結リストDDLL
a presentation of the DDLL algorithm, which constructs and maintains distributed doubly-linked lists.
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距離が付加された要素集合をコンパクトに表現できるDistance Bloom Filterの提案とP2Pネットワークにおける最短経路探索への応用
P2PネットワークにおけるSkip GraphとBloom Filterを用いた効率的な複数キーワード検索手法の提案
P2PネットワークにおけるSkip GraphとBloom Filterを用いた効率的な複数キーワード検索手法の提案
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