JP2003273912A - Path selection type data transmission system, path selection method in data transfer, and medium in which program for executing the same method is recorded - Google Patents

Path selection type data transmission system, path selection method in data transfer, and medium in which program for executing the same method is recorded

Info

Publication number
JP2003273912A
JP2003273912A JP2002072819A JP2002072819A JP2003273912A JP 2003273912 A JP2003273912 A JP 2003273912A JP 2002072819 A JP2002072819 A JP 2002072819A JP 2002072819 A JP2002072819 A JP 2002072819A JP 2003273912 A JP2003273912 A JP 2003273912A
Authority
JP
Japan
Prior art keywords
server
data
transfer
data transfer
execution
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2002072819A
Other languages
Japanese (ja)
Other versions
JP3646126B2 (en
Inventor
Mitsuhiro Otake
充洋 大竹
Michimasa Yokoo
理雅 横尾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CEC KK
Computer Engineering and Consulting Ltd
Original Assignee
CEC KK
Computer Engineering and Consulting Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CEC KK, Computer Engineering and Consulting Ltd filed Critical CEC KK
Priority to JP2002072819A priority Critical patent/JP3646126B2/en
Publication of JP2003273912A publication Critical patent/JP2003273912A/en
Application granted granted Critical
Publication of JP3646126B2 publication Critical patent/JP3646126B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently transfer data by dynamically changing an execution server in the case of selecting a transfer path in data transfer. <P>SOLUTION: In this data transfer system that performs the data transfer by selecting the execution server that executes the data transfer among a main server and a plurality of mirror servers constituting a distribution server by performing a routing processing, it is provided with a transfer rate comparison means that measures data transfer rate by the selected execution server and compares the measured transfer rate with prescribed transfer rate, the execution server is selected again among the main server or the plurality of the mirror servers by performing the routing processing again according to output of the transfer rate comparison means and pieces of untransferred data which are not transferred by the execution servers selected before it are transferred to a client by the execution server which is selected again. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明はデータ転送システム
に関するものであり、特にネットワークにおけるデータ
転送経路を動的に変更可能として効率よくデータを転送
するようにした経路選択型データ転送システムに関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer system, and more particularly to a route selection type data transfer system capable of dynamically changing a data transfer route in a network to efficiently transfer data.

【0002】[0002]

【従来の技術】例えば、ウェブサーバで公開しているホ
ームページを閲覧ソフトを利用してクライアントの端末
に表示したり、あるいは、このようなホームページに掲
載されているファイルをクライアントがダウンロードす
るような場合、クライアントは通常、ネットワーク上の
配信サービスサーバにリクエストを出し、このリクエス
トを受けた配信サービスサーバがウェブサーバにアクセ
スして必要なファイルをダウンロードしてクライアント
に転送する。
2. Description of the Related Art For example, when a homepage published on a web server is displayed on a client terminal by using browsing software, or when a client downloads a file posted on such a homepage. The client normally issues a request to the delivery service server on the network, and the delivery service server receiving the request accesses the web server, downloads a necessary file, and transfers it to the client.

【0003】このファイル転送を、クライアントとサー
ビスサーバの関係を1対1にして行うと、ファイル転送
が完了するか、クライアントが転送処理をキャンセルす
るまでは、その転送経路を変更することができなくな
り、人気が高いサイトでファイル転送のアクセス数が多
いような場合に、サーバの負荷や、回線負荷が大きくな
る。このため、ファイルを配信する配信サーバは、通
常、ミラーサーバと呼ぶサーバを複数箇所に設置してお
き、このミラーサーバの中からクライアントに最も早く
データを転送できるサーバを選択して、そのサーバ(実
行サーバ)を介してデータを転送するようにしている。
If this file transfer is performed with a one-to-one relationship between the client and the service server, the transfer path cannot be changed until the file transfer is completed or the client cancels the transfer process. When the number of file transfer accesses is large at a popular site, the load on the server and the line load increase. For this reason, a distribution server that distributes files usually has servers called mirror servers installed at a plurality of locations, and a server that can transfer data to a client earliest is selected from the mirror servers and the server ( Data is transferred via the execution server).

【0004】しかしながら、このような従来のデータ転
送方法では、転送を開始する前に転送経路が一義的に決
まってしまう。すなわち、ミラーサーバを複数箇所に設
けていても、転送開始前に使用するミラーサーバを決定
した時点でファイル転送経路が決まるため、転送途中に
その経路に何らかの不具合が生じた場合に、転送に時間
がかかることがある。この問題は、企業間ネットワー
ク、ケーブルTV、ADSL契約者等の高速回線ネット
ワークに対して、通常の低速回線を使用するクライアン
トが、サイズの大きいファイルの転送を依頼する場合な
どに特に著しい。
However, in such a conventional data transfer method, the transfer path is uniquely determined before the transfer is started. In other words, even if mirror servers are provided at multiple locations, the file transfer route is determined when the mirror server to be used is determined before the transfer is started. It may take time. This problem is particularly remarkable when a client using a normal low-speed line requests transfer of a large file to a high-speed line network such as an inter-company network, cable TV, and ADSL subscriber.

【0005】[0005]

【発明が解決しようとする課題】本発明は、この問題を
解決すべくなされたものであり、データ転送経路を動的
に変更できるようにすると共に、ミラーサーバ間で同期
を取ってデータ転送を行うことにより、転送効率を向上
させた経路選択型データ転送システムを提供することを
目的とする。
SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and makes it possible to dynamically change the data transfer path and to synchronize data between mirror servers to transfer data. It is an object of the present invention to provide a route selection type data transfer system with improved transfer efficiency.

【0006】[0006]

【課題を解決するための手段】上記課題を解決するため
に、本発明の経路選択型データ転送システムは、ネット
ワークを介してクライアントにデータを転送するデータ
転送システムであって、主サーバと、前記ネットワーク
上の物理的に異なる地点に設置され前記主サーバから提
供されるデータを複製、蓄積し、前記主サーバに代わっ
て前記クライアントにこのデータを転送する機能を有す
る複数のミラーサーバとを具え、ルーティング処理を行
って前記主サーバと複数のミラーサーバの中から適宜実
行サーバを選択してデータ転送を行うデータ転送システ
ムにおいて、前記選択された実行サーバによるデータ転
送速度を測定して当該測定した転送速度と所定の転送速
度を比較する転送速度比較手段を具え、この転送速度比
較手段の出力に応じて再度ルーティング処理を行って前
記主サーバあるいは前記複数のミラーサーバから再度実
行サーバを選択して、この再度選択された実行サーバに
て、これより以前に選択された実行サーバによって転送
されなかった未転送データを前記クライアントに転送す
ることを特徴とする。
In order to solve the above problems, a route selection type data transfer system of the present invention is a data transfer system for transferring data to a client via a network, which comprises a main server and A plurality of mirror servers which are installed at physically different points on the network, duplicate and store data provided by the main server, and have a function of transferring this data to the client on behalf of the main server, In a data transfer system that performs a routing process and appropriately selects an execution server from the main server and a plurality of mirror servers to transfer data, the data transfer rate by the selected execution server is measured, and the measured transfer is performed. It comprises a transfer rate comparing means for comparing the speed with a predetermined transfer rate, and responds to the output of the transfer rate comparing means. Then, the routing process is performed again to select an execution server again from the main server or the plurality of mirror servers, and the re-execution server has not been transferred by the execution server previously selected. Transfer data is transferred to the client.

【0007】このように、本発明のシステムによれば、
実行サーバのデータ転送速度に応じて、実行サーバを動
的に変更することができ、また、新たに選択された実行
サーバでは、以前に選択された実行サーバで転送されな
かった未転送データをクライアントに転送するため、実
行サーバになんらかの障害が生じたような場合に、適宜
サーバを変更して転送を引き継いで、スムーズにデータ
転送を行うことができる。
Thus, according to the system of the present invention,
The execution server can be changed dynamically according to the data transfer rate of the execution server, and the newly selected execution server can transfer untransferred data that was not transferred by the previously selected execution server to the client. Therefore, if any failure occurs in the execution server, the server can be appropriately changed to take over the transfer, and the data can be transferred smoothly.

【0008】なお、前記ルーティング処理は、前記主サ
ーバと前記複数のミラーサーバの各々から前記クライア
ントに対して所定の信号を配信してその応答時間を測定
して比較し、最も応答時間が速いサーバを実行サーバと
して選択して行うのが好ましい。
In the routing process, a predetermined signal is distributed from the main server and each of the plurality of mirror servers to the client, the response time is measured and compared, and the server having the fastest response time is sent. Is preferably selected as the execution server.

【0009】また、実行サーバにおける転送速度を、当
該実行サーバが前記クライアントに転送したデータの応
答速度で測定するようにした。
Further, the transfer speed in the execution server is measured by the response speed of the data transferred by the execution server to the client.

【0010】さらに、本発明のシステムでは、前記主サ
ーバと前記ミラーサーバとがそれぞれ相互通信機能を有
し、実行サーバが新たに選択された場合に、現実行サー
バはそれまでに転送が終了したデータ位置を示す情報を
新たに選択された実行サーバへ直接通知しうるようにす
るとともに、主サーバおよびミラーサーバが、それぞ
れ、自身が転送したデータをレコード単位で計数する手
段を有しており、現実行サーバはこの計数結果を転送が
終了したデータ位置として新たに選択された実行サーバ
へ通知するようにした。
Further, in the system of the present invention, when the main server and the mirror server each have a mutual communication function and an execution server is newly selected, the transfer of the current execution server is completed by then. The information indicating the data position can be directly notified to the newly selected execution server, and the main server and the mirror server each have means for counting the data transferred by themselves in record units, The current execution server notifies the newly selected execution server of this counting result as the data position where the transfer is completed.

【0011】このように構成することによって、現実行
サーバでのデータ転送情報を次に選択された実行サーバ
に直接送り、各サーバ間で同期を取ってデータ転送が行
われるため、効率よくデータを転送することができる。
With this configuration, the data transfer information in the current execution server is directly sent to the next selected execution server, and the data transfer is performed in synchronization between the servers, so that the data can be efficiently transferred. Can be transferred.

【0012】本願第2発明は、データ転送を行う際の経
路転送方法に関するものであり、主サーバと、前記主サ
ーバから提供されるデータを複製、蓄積し、前記主サー
バに代わってこのデータを配信する機能を有する複数の
ミラーサーバとをネットワーク上の物理的に異なる地点
に設置して、これらのサーバの中から、実行サーバを選
択してクライアントにデータを転送するデータ転送にお
いて、 (1)前記主サーバおよび前記ミラーサーバの各々から
前記クライアントに対して信号を送信してその応答時間
を測定する工程と; (2)前記工程(1)で測定した応答時間のうち最短の
応答時間を示したサーバを実行サーバとして選択する工
程と; (3)前記工程(2)で選択した実行サーバにて前記デ
ータをクライアントに転送する工程と; (4)前記工程(3)における実行サーバのデータ転送
速度を測定して、これを所定の基準転送速度と比較する
工程と; (5)工程(4)における比較結果が前記実行サーバの
データ転送速度が所定の基準転送速度より遅いことを示
す場合に、前記主サーバおよび前記ミラーサーバの中か
ら新たに転送実行サーバを選択して、この新たに選択し
たサーバにて前記工程(3)にて転送できなかった残り
のデータを転送する工程と;を具えることを特徴とす
る。
The second invention of the present application relates to a route transfer method at the time of performing data transfer, copying and accumulating data provided from the main server and the main server, and using this data in place of the main server. In a data transfer in which a plurality of mirror servers having a distribution function are installed at physically different points on the network, an execution server is selected from these servers and data is transferred to a client, (1) Transmitting a signal from each of the main server and the mirror server to the client and measuring the response time thereof; (2) showing the shortest response time of the response times measured in the step (1). And (3) transferring the data to the client by the execution server selected in the step (2). (4) a step of measuring the data transfer rate of the execution server in the step (3) and comparing this with a predetermined reference transfer rate; (5) the comparison result in the step (4) is the data transfer of the execution server. When the speed is lower than the predetermined reference transfer speed, a transfer execution server is newly selected from the main server and the mirror server, and the newly selected server is used in the step (3). Transferring the remaining data that could not be transferred.

【0013】このような方法によれば、データ転送を実
行中のサーバに障害が生じた場合に、速やかに実行サー
バを変更して残りのデータを転送することが可能とな
り、より迅速にクライアントにデータを配信して、サー
バの混雑を回避することができる。
According to such a method, when a failure occurs in the server that is executing the data transfer, it becomes possible to promptly change the execution server and transfer the remaining data, and to the client more quickly. Data can be distributed to avoid server congestion.

【0014】なお、工程(5)における転送実行サーバ
の選択は、前記工程(1)および(2)を再度実行して
行うのが好ましい。
The selection of the transfer execution server in step (5) is preferably performed by executing steps (1) and (2) again.

【0015】また、転送すべき全データの転送が終了す
るまで、前記工程(3)ないし(5)を繰り返して実行
し、(ただし、工程(3)の転送実行サーバは工程
(5)で選択した新たなサーバとする)て、実行サーバ
における障害の発生に対応すれば、実行サーバに何度障
害が生じてもそれに対応することができる。
The steps (3) to (5) are repeatedly executed until the transfer of all the data to be transferred is completed (however, the transfer execution server of the step (3) is selected in the step (5)). As a new server), it is possible to cope with the occurrence of a failure in the execution server, no matter how many times the execution server fails.

【0016】前記工程(4)における測定は、データを
構成するレコードを転送する毎、あるいは所定の数のレ
コードを転送する毎、あるいは所定の時間間隔毎に行う
ことができる。
The measurement in the step (4) can be carried out every time when the records forming the data are transferred, every time when a predetermined number of records are transferred, or every predetermined time interval.

【0017】また、前記工程(5)における転送実行サ
ーバのデータ転送速度が所定の基準転送速度より遅いか
否かの判断は、工程(4)において測定したクライアン
トからの応答時間を基準転送時間と比較して、これが前
記基準転送時間より遅い場合にデータ転送時間が遅いと
する、あるいは前記工程(4)において測定した複数回
のクライアントからの応答時間がいずれも前記基準転送
時間より遅い場合に、データ転送時間が基準転送時間よ
り遅いとする、あるいは前記工程(4)において測定し
た複数回のクライアントからの応答時間の平均値を求
め、この平均値が前記基準転送時間より遅い場合に、前
記データ転送時間が基準転送時間より遅いと判断するこ
とができる。
Further, in the step (5), whether or not the data transfer rate of the transfer execution server is lower than a predetermined reference transfer rate is determined by using the response time from the client measured in the step (4) as the reference transfer time. By comparison, if this is slower than the reference transfer time, the data transfer time is slow, or if the response times from the clients measured in step (4) are both slower than the reference transfer time. If the data transfer time is slower than the reference transfer time, or if the average value of the response times from the clients measured a plurality of times in the step (4) is obtained and the average value is slower than the reference transfer time, the data is transferred. It can be determined that the transfer time is later than the reference transfer time.

【0018】なお、本明細書で、「ミラーサーバ」と
は、あるファイルサーバがダウンロード可能なファイル
を持ち、ダウンロードサービスを提供する場合に、アク
セスが集中するサーバの負荷を分散させることを目的と
して設置した、前記ファイルサーバと同一の内容を持つ
他のサーバをいい、「転送経路」とは、ネットワーク上
でデータを送受信する際に、クライアントとサーバ間の
データ転送のための伝送路をいい、「ルーティング」と
は、ネットワーク上にある機器により、データを送信す
るために当該機器に接続されている複数の転送経路中か
ら最適な転送経路を選択する動作をいい、「通信ソフ
ト」とは、クライアントがネットワーク上でウェブサー
バで公開されているホームページ等の情報を見る際に使
用するブラウザ等のソフトウエア、あるいはファイル転
送の目的に使用するソフトウエアを意味する。
In the present specification, the "mirror server" is intended to distribute the load on the server where access is concentrated when a certain file server has downloadable files and provides a download service. The installed server means another server having the same contents as the file server, and the "transfer path" means a transmission path for data transfer between the client and the server when transmitting / receiving data on the network, "Routing" means an operation of selecting an optimum transfer route from a plurality of transfer routes connected to the device for transmitting data by a device on the network, and "communication software" means A browser or other software used by clients to view information such as homepages published by web servers on the network. Touea, or refers to the software to be used for the purposes of the file transfer.

【0019】[0019]

【発明の実施の形態】以下に、図面を参照して本発明の
データ転送システムおよび当該システムにおける転送経
路選択方法について詳細に説明する。図1は、本発明の
データ転送システムの全体の構成を示す図である。図1
に示すように、クライアント10、配送サーバ30、ウ
ェブサーバ40は、インターネット20に接続されてい
る。クライアント10はウェブサーバ40が配信してい
るファイル(データ)の入手を希望しており、ブラウザ
等の通信ソフトを使用して、ウェブサーバ40のURL
(Uniform Resource Locators)を指定してネットワー
ク20上の配信サーバ30を介してファイルの取り込み
を試みている。
BEST MODE FOR CARRYING OUT THE INVENTION The data transfer system of the present invention and the transfer path selection method in the system will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing the overall configuration of a data transfer system of the present invention. Figure 1
As shown in, the client 10, the delivery server 30, and the web server 40 are connected to the Internet 20. The client 10 desires to obtain the file (data) distributed by the web server 40, and uses the communication software such as a browser to access the URL of the web server 40.
The (Uniform Resource Locators) is specified and an attempt is made to import a file via the distribution server 30 on the network 20.

【0020】クライアントが指定したURLは、DNS
(Domain Name Server)(図示せず)によってIPアド
レスに変換され、通信ソフトはこのIPアドレスをデー
タに付加して、パケットとして配信サーバ30に送信す
る。これを受けた配信サーバ30は、クライアント10
が指定するウェブサイト40にアクセスして必要なファ
イルをダウンロードしてクライアント10に転送する。
The URL specified by the client is the DNS
It is converted into an IP address by (Domain Name Server) (not shown), and the communication software adds this IP address to the data and sends it to the distribution server 30 as a packet. Upon receiving this, the distribution server 30 receives the client 10
To access the website 40 designated by, download the necessary files and transfer them to the client 10.

【0021】配信サーバ30は、このファイル転送処理
を司る主サーバ30−1と、ネットワーク20上の物理
的に異なる地点に設置された複数台のミラーサーバ30
−2〜30−nで構成されている。各ミラーサーバ30
−2〜30−nは、本サーバ30aから提供されるデー
タを複製、蓄積し、本サーバ30aに代わってこのデー
タをクライアント10に配信する機能を有する。また、
主サーバ30−1とミラーサーバ30−2〜30−n
は、各々が相互に通信する機能を有する。
The distribution server 30 and the main server 30-1 which controls the file transfer process and a plurality of mirror servers 30 installed at physically different points on the network 20.
It is composed of −2 to 30-n. Each mirror server 30
Each of −2 to 30-n has a function of copying and accumulating data provided from the server 30a, and delivering the data to the client 10 on behalf of the server 30a. Also,
Main server 30-1 and mirror servers 30-2 to 30-n
Have a function of communicating with each other.

【0022】配信サーバ30は、ルーティング機能を備
えており、本サーバ30−1とミラーサーバ30−2〜
30−nの中から最速でデータ転送を行うことのできる
サーバを選択して転送を実行する。すなわち、本サーバ
30−1はクライアントのリクエストを受けてウェブサ
ーバ40からファイルをダウンロードすると共に、各ミ
ラーサーバ30−2〜30−nに対してクライアント1
0にパケットを発信してその応答時間を測定し、本サー
バ30−1に報告するように指示を出す。なお、本サー
バ30−1自身でも同様にパケットを発信して自身の応
答時間を測定する。本サーバ30−1は、各サーバ(本
サーバ自身を含む)の応答時間を比較して最速のミラー
サーバ(あるいは本サーバ自身)を選択して、クライア
ント10にファイル転送を行うようにそのサーバに指示
する。なお、各サーバは、自身で転送したファイルを構
成するレコード数をカウントする機能を有しており、実
行サーバとして選択されたら、自身が転送したレコード
数をカウントする。
The distribution server 30 has a routing function, and the main server 30-1 and the mirror servers 30-2 to 30-2.
A server that can transfer data at the highest speed is selected from 30-n and the transfer is executed. That is, the server 30-1 downloads a file from the web server 40 in response to a request from the client, and at the same time, the client 1 requests each mirror server 30-2 to 30-n.
A command is issued to send a packet to 0, measure the response time, and report to the server 30-1. The server 30-1 itself also transmits a packet in the same manner to measure its own response time. The server 30-1 compares the response times of the servers (including the server itself), selects the fastest mirror server (or the server itself), and instructs the server to transfer the file to the client 10. Give instructions. Each server has a function of counting the number of records constituting the file transferred by itself, and when selected as an execution server, counts the number of records transferred by itself.

【0023】また、各ミラーサーバ(本サーバ30−1
を含む)は、実行サーバとしてファイル転送を行う場
合、転送したデータの応答時間を測定して、この測定し
た応答時間を所定の基準値と比較する機能を具えてお
り、この応答時間が基準値より遅くなった場合に、その
旨を本サーバ30−1に通知する。本サーバ30−1
は、転送を実行しているミラーサーバからこの通知を受
けるか、あるいは自身が実行サーバである場合は、自身
が測定したデータの応答時間が基準値より遅くなった場
合に、上記ルーティング処理を再度行って、新たに実行
サーバを選択し、元の実行サーバに新しく選択した実行
サーバのアドレスを通知する(自身が実行サーバである
場合は、この通知は不要である)。
Each mirror server (main server 30-1)
, Which includes the function of measuring the response time of the transferred data and comparing the measured response time with a predetermined reference value when performing file transfer as an execution server. When it becomes later, the fact is notified to the server 30-1. Main server 30-1
Receives this notification from the mirror server that is performing the transfer, or, if it is the execution server, when the response time of the data measured by itself becomes slower than the reference value, the above routing process is restarted. The new execution server is selected, and the address of the newly selected execution server is notified to the original execution server (this notification is unnecessary if the execution server itself is the execution server).

【0024】このアドレスの通知を受けた現実行サーバ
は、自身でカウントした転送済みのレコード数を新たに
選択された実行サーバに通知して、通知を受けた新実行
サーバでは、このカウント値の次のレコードから転送を
開始して、転送処理を引き継ぐ。
The current execution server notified of this address notifies the newly selected execution server of the number of transferred records counted by itself, and the new execution server notified of this count value of this count value. Transfer is started from the next record and the transfer process is taken over.

【0025】新たに選択された実行サーバでも、同様に
転送データの応答時間を測定して基準値と比較し、この
応答時間が基準値を下回った場合は、上記のルーティン
グ処理を繰り返して再度実行サーバを選択して、転送処
理を引き継ぐようにする。
Even in the newly selected execution server, similarly, the response time of the transfer data is measured and compared with the reference value. If this response time is less than the reference value, the above routing process is repeated and executed again. Select a server to take over the transfer process.

【0026】次いで、本発明のシステムの動作をフロー
チャートに基づいて説明する。図2は、配信サーバ30
におけるルーティング処理を説明するためのフローチャ
ート、図3は実行サーバを変更する場合のデータ転送引
継処理を説明するためのフローチャートである。以下、
順次説明する。
Next, the operation of the system of the present invention will be described based on a flowchart. FIG. 2 shows the distribution server 30.
FIG. 3 is a flowchart for explaining the routing processing in FIG. 3, and FIG. 3 is a flowchart for explaining the data transfer takeover processing when the execution server is changed. Less than,
This will be explained sequentially.

【0027】クライアント10は入手を希望するファイ
ル名を指定して本サーバ30−1に対して転送要求を送
る(ステップS1)。これを受けて本サーバ30−1
は、必要なファイルをウェブサーバ40ダウンロードし
て、ミラーサーバ30−2〜30−nにこれを送り、一
方、各ミラーサーバ30−2〜30−nに対してクライ
アント10のIPアドレスを通知して、クライアント1
0からの応答時間を測定するよう指示を出す(ステップ
S2)。なおクライアント10のIPアドレスは、クラ
イアント10からのファイル転送要求によって知ること
ができる。
The client 10 specifies a file name desired to be obtained and sends a transfer request to the server 30-1 (step S1). In response to this, the server 30-1
Downloads the required file to the web server 40 and sends it to the mirror servers 30-2 to 30-n, while notifying each mirror server 30-2 to 30-n of the IP address of the client 10. The client 1
An instruction is issued to measure the response time from 0 (step S2). The IP address of the client 10 can be known by a file transfer request from the client 10.

【0028】各ミラーサーバ30−2〜30−nは、パ
ケットをクライアント10に送信して応答を要求し(ス
テップS3)、クライアント10からの応答時間を測定
して(ステップS4、S5)これを本サーバ30−1に
報告する(ステップS8)。なお、本サーバ30−1自
身もパケットを送信して自身のクライアント10からの
応答時間を測定する。
Each of the mirror servers 30-2 to 30-n sends a packet to the client 10 to request a response (step S3) and measures the response time from the client 10 (steps S4 and S5). Report to the server 30-1 (step S8). The server 30-1 itself also transmits a packet and measures the response time from its own client 10.

【0029】なお、本例では、パケットを送信して応答
時間を測定するようにしているが、このほか、PING
コマンド、TRACERTコマンド等を用いて応答時間
を測定するようにしても良い。
In this example, the packet is transmitted and the response time is measured.
The response time may be measured using a command, a TRACERT command, or the like.

【0030】本サーバ30−1では、各ミラーサーバ3
0−2〜30−nから報告されてきた応答時間および自
身の応答時間を比較して(ステップS9)、各ミラーサ
ーバおよび自身の中から最も応答時間の短いサーバを選
択して(ステップS10、本例では、ミラーサーバ30
−3)実行サーバとして、このサーバ30−3にファイ
ル名を指定してデータ転送を指示する(ステップS1
1)。
In the present server 30-1, each mirror server 3
The response time reported from 0-2 to 30-n and the response time of itself are compared (step S9), and the server with the shortest response time is selected from each mirror server and itself (step S10, In this example, the mirror server 30
-3) As the execution server, the server 30-3 is instructed to transfer data by designating a file name (step S1).
1).

【0031】選択されたミラーサーバ30−3は、クラ
イアント10に対してファイル転送を開始するが(ステ
ップS12)、ここで、ファイルを構成するレコード毎
にクライアント10からの応答時間を測定し、所定の基
準時間と比較して、応答時間が基準時間より遅い場合
は、他のミラーサーバあるいは本サーバへ転送処理を引
き継ぐようにする。なお、応答時間に遅延が認められな
かった場合は、その実行サーバ(30−3)にてそのま
まファイル転送を継続し、完遂させる。
The selected mirror server 30-3 starts the file transfer to the client 10 (step S12). Here, the response time from the client 10 is measured for each record constituting the file, and the predetermined time is determined. If the response time is slower than the reference time of (1), the transfer processing is handed over to another mirror server or this server. When the response time is not delayed, the execution server (30-3) continues the file transfer and completes the file transfer.

【0032】図3は、実行サーバ30−3でファイル転
送に遅延が生じて、他のサーバに転送処理を引き継ぐ場
合の動作を示すフローチャートである。上述したとお
り、実行サーバであるミラーサーバ30−3にてデータ
転送を行うと共に、転送するレコード毎にクライアント
に応答を要求して(ステップS20)、その応答時間を
測定する(ステップS21、S22)。ここで、応答時
間が所定の基準値より長い場合に(ステップS23、Y
ES)、ミラーサーバ30−3はその旨を本サーバ30
−1へ通知する(ステップS26)。この通知を受けた
本サーバ30−1は、再度ルーティング処理を行い(ス
テップS27)、最適サーバを再び選択する(ステップ
S28、ここではミラーサーバ30−2を選択)。この
ルーティング処理は、図2に示すステップS2〜S9を
繰り返して行う。
FIG. 3 is a flow chart showing an operation when a file transfer is delayed in the execution server 30-3 and the transfer process is taken over by another server. As described above, the mirror server 30-3, which is the execution server, transfers data, requests a response from the client for each record to be transferred (step S20), and measures the response time (steps S21 and S22). . Here, when the response time is longer than the predetermined reference value (step S23, Y
ES), the mirror server 30-3 notifies the server 30 to that effect.
-1 is notified (step S26). Upon receiving this notification, the server 30-1 performs the routing process again (step S27) and selects the optimum server again (step S28, here, the mirror server 30-2 is selected). This routing process is performed by repeating steps S2 to S9 shown in FIG.

【0033】本サーバ30−1は、ここで新たに実行サ
ーバとして選択したミラーサーバ30−2のアドレスを
元の実行サーバであるミラーサーバ30−3に通知して
引継処理を行うよう指示する(ステップS28、S2
9)。
The server 30-1 notifies the mirror server 30-3, which is the original execution server, of the address of the mirror server 30-2 newly selected as the execution server, and instructs the mirror server 30-3 to perform the takeover process ( Steps S28 and S2
9).

【0034】この指示を受けてミラーサーバ30−3は
新たに選択されたミラーサーバ30−2に対して、クラ
イアントのIPアドレスと、転送を行うファイル名と、
自身がカウントした転送済みのレコード数を通知し(ス
テップS29)、新たに選択された実行サーバ30−2
は、元のサーバ30−3から通知を受けた次のレコード
位置からクライアント10にファイル転送を開始する
(ステップS30)。
In response to this instruction, the mirror server 30-3 sends the IP address of the client, the file name to be transferred, and the file name to the newly selected mirror server 30-2.
The number of transferred records counted by itself is notified (step S29), and the newly selected execution server 30-2 is notified.
Starts the file transfer to the client 10 from the next record position notified from the original server 30-3 (step S30).

【0035】このように構成することによって、クライ
アント10は、最も早い転送経路でファイルをダウンロ
ードすることが可能となる。なお、ファイル転送を引き
継いだミラーサーバ30−2に、更に障害が生じて転送
速度が遅くなった場合は、上記ステップS20以降の動
作を繰り返して、その都度最適なサーバを見つけて転送
を引き継いでゆく。当然のことながら、本サーバ30−
1も、最適サーバの選択候補の一つである。本サーバ3
0−1が実行サーバとして選択された場合は、転送速度
の遅れを判断して、自身で代替のミラーサーバを選択し
て転送を引き継ぐようにする。
With this configuration, the client 10 can download the file through the fastest transfer route. If the mirror server 30-2 that has taken over the file transfer has a further failure and the transfer speed becomes slower, the operations from step S20 onward are repeated to find the optimum server each time and take over the transfer. go. As a matter of course, this server 30-
1 is also one of the selection candidates for the optimum server. This server 3
When 0-1 is selected as the execution server, the delay of the transfer rate is judged, and the alternative mirror server is selected by itself so as to take over the transfer.

【0036】なお、転送ファイルは、レコードの集まり
としてとらえることができるので、各サーバは、昇順で
ファイル転送を実行し、自身が転送したレコードの数を
カウントすることによって、転送ファイルのどこまでを
転送したかを把握することができる。従って、転送途中
で他のサーバに引き継ぎを行う場合は、転送を中止した
時点におけるレコードの数を次に選択されたサーバに通
知すればよい。新たに選択されたサーバでは、通知され
たレコード数+1のレコード位置から転送を開始する。
なお、全サーバがその順序を認識している限り、あるい
は転送を引き継ぐ際にその順序も通知するようにすれ
ば、転送は降順で、あるいはその他の順序で行ってもよ
い。
Since the transfer file can be regarded as a collection of records, each server transfers files in ascending order and counts the number of records transferred by itself, thereby transferring up to what part of the transfer file. You can figure out what you did. Therefore, when transferring to another server during the transfer, the number of records at the time when the transfer is stopped may be notified to the next selected server. The newly selected server starts the transfer from the record position of the notified record number + 1.
As long as all the servers recognize the order, or if the order is notified when the transfer is taken over, the transfer may be performed in the descending order or in another order.

【0037】実行サーバにおけるファイル転送速度の遅
延は、以下の通り判断する。実行サーバは、クライアン
トへ最初に転送したレコードの応答時間をTminとし
て記録しておき、順次、レコードを転送してその応答時
間を測定して、これをTminと比較し、測定した応答
時間がTminより小さければTminを更新してゆ
く。測定した応答時間が、Tminより大きいときは、
その時点から連続して数回の応答時間を測定し、これら
の測定結果すべてがTminより大きい場合に遅延が生
じたと判断する。なお、この測定回数は任意に設定する
ことができる。
The delay of the file transfer speed in the execution server is judged as follows. The execution server records the response time of the record first transferred to the client as Tmin, sequentially transfers the records, measures the response time thereof, compares this with Tmin, and compares the measured response time with Tmin. If it is smaller, Tmin is updated. When the measured response time is larger than Tmin,
The response time is measured several times in succession from that point in time, and if all of these measurement results are greater than Tmin, it is determined that a delay has occurred. The number of times of measurement can be set arbitrarily.

【0038】転送速度の遅延の判断は、上述の方法に限
るものではなく、例えば、数回の測定結果の平均値を計
算して、この平均値がTminより大きい場合いに遅延
が生じたと判断するようにしても良い。また、一回でも
応答時間がTminより小さければ、遅延が生じたと判
断しても良い。さらに、上述の例では、レコードを送信
する毎に応答時間を測定するようにしているが、所定数
のレコードを送信する毎、あるいは所定の時間毎に応答
を求めるようにしても良い。
The judgment of the delay of the transfer rate is not limited to the above-mentioned method. For example, the average value of the measurement results of several times is calculated, and when the average value is larger than Tmin, it is judged that the delay has occurred. It may be done. Further, if the response time is smaller than Tmin even once, it may be determined that a delay has occurred. Furthermore, in the above example, the response time is measured every time a record is transmitted, but the response may be calculated every time a predetermined number of records are transmitted or every predetermined time.

【0039】[0039]

【発明の効果】上述したとおり、本発明のデータ転送シ
ステムによれば、転送経路を動的に変更することができ
るため、一旦選択したサーバに障害が生じたような場合
でも、適宜経路を変更してデータを転送することによっ
て、効率よく、最速ルートでデータ転送を実行すること
ができる。
As described above, according to the data transfer system of the present invention, the transfer route can be dynamically changed, so that the route can be changed appropriately even if the selected server fails. By transferring the data by performing the transfer, the data transfer can be efficiently executed by the fastest route.

【図面の簡単な説明】[Brief description of drawings]

【図1】図1は、本発明のデータ転送システムの全体の
構成を示す図である。
FIG. 1 is a diagram showing an overall configuration of a data transfer system of the present invention.

【図2】図2は、本発明のデータ転送システムにおける
ルーティング処理動作を説明するためのフローチャート
である。
FIG. 2 is a flow chart for explaining a routing processing operation in the data transfer system of the present invention.

【図3】図3は、本発明のデータ転送システムにおける
転送引継処理動作を説明するための図である。
FIG. 3 is a diagram for explaining a transfer takeover processing operation in the data transfer system of the present invention.

【符号の説明】[Explanation of symbols]

10 クライアント 20 インターネット 30 配信サーバ 30−1 主サーバ 30−2〜30−n ミラーサーバ 40 ウェブサーバ 10 clients 20 Internet 30 distribution servers 30-1 Main server 30-2 to 30-n Mirror server 40 web server

Claims (14)

【特許請求の範囲】[Claims] 【請求項1】 ネットワークを介してクライアントにデ
ータを転送するデータ転送システムであって、主サーバ
と、前記ネットワーク上の物理的に異なる地点に設置さ
れ前記主サーバから提供されるデータを複製、蓄積し、
前記主サーバに代わって前記クライアントにこのデータ
を転送する機能を有する複数のミラーサーバとを具え、
ルーティング処理を行って前記主サーバと複数のミラー
サーバの中から適宜実行サーバを選択してデータ転送を
行うシステムにおいて、 前記選択された実行サーバによるデータ転送速度を測定
して当該測定した転送速度と所定の転送速度を比較する
転送速度比較手段を具え、この転送速度比較手段の出力
に応じて再度ルーティング処理を行って前記主サーバあ
るいは前記複数のミラーサーバから再度実行サーバを選
択して、この再度選択された実行サーバにて、これより
以前に選択された実行サーバによって転送されなかった
未転送データを前記クライアントに転送することを特徴
とする経路選択型データ転送システム。
1. A data transfer system for transferring data to a client via a network, which duplicates and stores data provided at a physically different point on the network from a main server. Then
A plurality of mirror servers having the function of transferring this data to the client on behalf of the main server,
In a system that performs a routing process and appropriately selects an execution server from the main server and a plurality of mirror servers to transfer data, a data transfer rate by the selected execution server is measured, and the measured transfer rate is A transfer rate comparison means for comparing a predetermined transfer rate is provided, and the routing processing is performed again according to the output of the transfer rate comparison means, and the execution server is selected again from the main server or the plurality of mirror servers. A route-selection-type data transfer system, wherein the selected execution server transfers untransferred data that has not been transferred by the execution server selected earlier to the client.
【請求項2】 請求項1に記載の経路選択型データ転送
システムにおいて、前記ルーティング処理は、前記主サ
ーバと前記複数のミラーサーバの各々から前記クライア
ントに対して所定の信号を配信してその応答時間を測定
して比較し、最も応答時間が速いサーバを実行サーバと
して選択して行うことを特徴とする経路選択型データ転
送システム。
2. The route selection type data transfer system according to claim 1, wherein the routing process delivers a predetermined signal from each of the main server and the plurality of mirror servers to the client and sends a response to the client. A route-selecting data transfer system characterized by measuring and comparing times and selecting a server with the fastest response time as an execution server.
【請求項3】 請求項1ないし2のいずれかに記載の経
路選択型データ転送システムにおいて、前記実行サーバ
における転送速度を、当該実行サーバが前記クライアン
トに転送したデータの応答速度で測定することを特徴と
する経路選択型データ転送システム。
3. The route selection data transfer system according to claim 1, wherein the transfer speed of the execution server is measured by a response speed of data transferred by the execution server to the client. Characteristic route selection type data transfer system.
【請求項4】 請求項1ないし3のいずれかに記載のデ
ータ転送システムにおいて、前記主サーバと前記ミラー
サーバとがそれぞれ相互通信機能を有し、実行サーバが
新たに選択された場合に、現実行サーバはそれまでに転
送が終了したデータ位置を示す情報を新たに選択された
実行サーバへ直接通知しうるようにしたことを特徴とす
る経路選択型データ転送システム。
4. The data transfer system according to claim 1, wherein the main server and the mirror server each have an intercommunication function, and an actual server is newly selected. The route selection type data transfer system characterized in that the row server can directly notify the newly selected execution server of the information indicating the data position where the transfer is completed by then.
【請求項5】 請求項4に記載の経路選択型データ転送
システムにおいて、前記主サーバおよび前記ミラーサー
バが、それぞれ、自身が転送したデータをレコード単位
で計数する手段を有しており、現実行サーバはこの計数
結果を転送が終了したデータ位置として新たに選択され
た実行サーバへ通知することを特徴とする経路選択型デ
ータ転送システム。
5. The route selection type data transfer system according to claim 4, wherein the main server and the mirror server each have means for counting the data transferred by themselves in record units, and the current execution The server notifies the newly selected execution server of the counting result as the data position where the transfer is completed, and the route selection type data transfer system.
【請求項6】 主サーバと、前記主サーバから提供され
るデータを複製、蓄積し、前記主サーバに代わってこの
データを配信する機能を有する複数のミラーサーバとを
ネットワーク上の物理的に異なる地点に設置して、これ
らのサーバの中から、実行サーバを選択してクライアン
トにデータを転送するデータ転送において、 (1)前記主サーバおよび前記ミラーサーバの各々から
前記クライアントに対して信号を送信してその応答時間
を測定する工程と; (2)前記工程(1)で測定した応答時間のうち最短の
応答時間を示したサーバを実行サーバとして選択する工
程と; (3)前記工程(2)で選択した実行サーバにて前記デ
ータをクライアントに転送する工程と; (4)前記工程(3)における実行サーバのデータ転送
速度を測定して、これを所定の基準転送速度と比較する
工程と; (5)工程(4)における比較結果が前記実行サーバの
データ転送速度が所定の基準転送速度より遅いことを示
す場合に、前記主サーバおよび前記ミラーサーバの中か
ら新たに転送実行サーバを選択して、この新たに選択し
たサーバにて前記工程(3)にて転送できなかった残り
のデータを転送する工程と;を具えることを特徴とする
データ転送における経路選択方法。
6. A main server and a plurality of mirror servers having a function of copying and accumulating data provided from the main server and distributing the data on behalf of the main server are physically different on a network. In a data transfer, which is installed at a point and selects an execution server from these servers to transfer data to a client, (1) each of the main server and the mirror server transmits a signal to the client And (2) selecting a server having the shortest response time among the response times measured in the step (1) as an execution server; and (3) the step (2). And (4) measuring the data transfer rate of the execution server in the step (3); Comparing this with a predetermined reference transfer rate; (5) if the comparison result in step (4) indicates that the data transfer rate of the execution server is slower than the predetermined reference transfer rate, the main server and the A step of newly selecting a transfer execution server from the mirror servers and transferring the remaining data that could not be transferred in the step (3) by the newly selected server. Route selection method for data transfer.
【請求項7】 請求項6に記載の経路選択方法におい
て、工程(5)における実行サーバの選択を、前記工程
(1)および(2)を再度実行することによって行うこ
とを特徴とするデータ転送における経路選択方法。
7. The data transfer method according to claim 6, wherein the execution server is selected in step (5) by executing steps (1) and (2) again. Route selection method.
【請求項8】 請求項6または7に記載の経路選択方法
において、転送すべき全データの転送が終了するまで、
前記工程(3)ないし(5)を繰り返して実行し、(た
だし、2回目以降は工程(3)の実行サーバは工程
(5)で選択した新たなサーバとする)ことを特徴とす
るデータ転送における経路選択方法。
8. The route selection method according to claim 6 or 7, wherein transfer of all data to be transferred is completed.
Data transfer characterized in that the steps (3) to (5) are repeatedly executed (however, the execution server of the step (3) is a new server selected in the step (5) after the second time). Route selection method.
【請求項9】 請求項6ないし8のいずれかに記載の経
路選択方法において、工程(1)における所定の信号
が、パケット、PINGコマンド、あるいはTRACE
RTコマンドであることを特徴とするデータ転送におけ
る経路選択方法。
9. The route selection method according to claim 6, wherein the predetermined signal in step (1) is a packet, a PING command, or a TRACE.
A route selection method in data transfer, which is an RT command.
【請求項10】 請求項6ないし9のいずれかに記載の
経路選択方法において、前記工程(4)における測定
を、前記データを構成するレコードを転送する毎、ある
いは所定の数のレコードを転送する毎、あるいは所定の
時間間隔毎に行うことを特徴とするデータ転送における
経路選択方法。
10. The route selection method according to claim 6, wherein the measurement in the step (4) is performed every time a record forming the data is transferred, or a predetermined number of records are transferred. A route selection method in data transfer, which is performed every time or at a predetermined time interval.
【請求項11】 請求項6ないし10のいずれかに記載
の経路選択方法において、前記工程(5)における実行
サーバのデータ転送速度が所定の基準転送速度より遅い
か否かの判断を、前記工程(3)においてクライアント
に転送したデータの応答時間を所定の値と比較して行う
ことを特徴とするデータ転送における経路選択方法。
11. The route selection method according to claim 6, wherein the step of judging whether or not the data transfer rate of the execution server in the step (5) is lower than a predetermined reference transfer rate. (3) A route selection method in data transfer, which is performed by comparing the response time of the data transferred to the client with a predetermined value.
【請求項12】 請求項6ないし10のいずれかに記載
のデータ転送方法において、前記工程(5)における実
行サーバのデータ転送速度が所定の基準転送速度より遅
いか否かの判断を、前記工程(4)において測定した複
数回のクライアントからの応答時間がいずれも所定の値
より小さい場合に、前記データ転送時間が基準転送時間
より遅いとすることを特徴とするデータ転送における経
路選択方法。
12. The data transfer method according to claim 6, wherein in the step (5), it is judged whether the data transfer rate of the execution server is lower than a predetermined reference transfer rate. A path selection method in data transfer, wherein the data transfer time is set to be later than the reference transfer time when the response times from the clients measured in (4) are all smaller than a predetermined value.
【請求項13】 請求項6ないし10のいずれかに記載
のデータ転送方法において、前記工程(5)における転
送実行サーバのデータ転送速度が所定の基準転送速度よ
り遅いか否かの判断を、前記工程(4)において測定し
た複数回のクライアントからの応答時間の平均値を求
め、この平均値が所定の値小さい場合に、前記データ転
送時間が基準転送時間より遅いとすることを特徴とする
データ転送における経路選択方法。
13. The data transfer method according to claim 6, wherein the judgment of whether or not the data transfer rate of the transfer execution server in the step (5) is slower than a predetermined reference transfer rate. Data characterized in that the average value of the response times from the clients measured a plurality of times in the step (4) is obtained, and the data transfer time is slower than the reference transfer time when the average value is smaller than a predetermined value. Route selection method for transfer.
【請求項14】 請求項6ないし13のいずれかに記載
のデータ転送方法を実行するプログラム。
14. A program for executing the data transfer method according to claim 6.
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