JP2014139824A - 複製されたコンテンツアドレス可能ストレージクラスタのための非同期分散型重複排除 - Google Patents
複製されたコンテンツアドレス可能ストレージクラスタのための非同期分散型重複排除 Download PDFInfo
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Abstract
【解決手段】分散型データ複製システムにおける装置群のうちの1つの装置によって、方法が実行される。方法は、分散型データ複製システムにおけるオブジェクトのインデックスを記憶することを含み、そのインデックスは、オブジェクトが、分散型データ複製システム内の複数の装置によって局部的に記憶される間に複製される。方法は、また、インデックスの少なくとも一部のスキャンを実行すること、およびそのインデックスのスキャンに基づいて、オブジェクトの少なくとも1つのの冗長な複製を識別することを含む。方法は、さらに、冗長な複製を重複排除すること、および冗長な複製の状態を反映するためにインデックスを更新することを含む。
【選択図】図1
Description
企業コンピューティングランドスケープは、中央サービスアーキテクチャが分散型ストレージクラスタへ移行したという点で、ストレージアーキテクチャにおいて抜本的な変化をもたらした。ビジネスは記憶効率を増加するための手法を模索しているので、汎用コンピュータから構築されるストレージクラスタは、新しいデータ量の多いアプリケーションのための高い性能、利用可能性、およびスケーラビリティを、モノリシックディスクアレイと比較して、わずかなコストで供給し得る。ストレージクラスタの全潜在能力を解き放つために、データは複数の地理的位置にわたって複製され、それによって、利用可能性を増大させるとともに、クライエントからのネットワーク距離を低減する。
1つの実行例によれば、方法は、分散型データ複製システムにおける、装置群のうちの1つの装置によって実行され得る。方法は、分散型データ複製システムにおいて、オブジェクトのインデックスを記憶することを含み、オブジェクトの複製が分散型データ複製システムにおける複数の装置によって局部的に記憶される間に、そのインデックスが複製される。方法は、そのインデックスの少なくとも一部のスキャンを実行すること、および、インデックのスキャンに基づいて、オブジェクトの少なくとも1つの冗長な複製を識別することも含み得る。方法は、さらに、インデックスの一部に重複排除レコードを書き込むことによって、冗長な複製の重複排除を行なうことを含み得る。
削除のための基準を提供する。
添付の図面は、この明細書に含まれるとともにこの明細書の一部を成し、明細書に記載される1つまたはより多くの実施形態を例示し、その記述とともに、これらの実施形態を説明する。
以下の詳細な説明は、添付の図面を参照する。異なる図面における同じ参照番号は、同じまたは類似の要素を特定し得る。また、以下の詳細な説明は、本発明を限定するものではない。
図1は、本明細書において説明されるシステムおよび方法が実行され得る例示的なシステム100の図である。システム100は、ネットワーク130を介して接続される、クライエント110−1〜110−N(総称してクライエント110、および個々にクライエント110とも称する。)およびストレージクラスタ120−1〜120−M(総称してストレージクラスタ120、および個々にストレージクラスタ120とも称する。)を含む。ストレージクラスタ120は、(図1の点線によって示されるような)ファイルシステム140を形成する。
図2は、ファイルシステム140の例示的構成の図である。図2に示されるように、ファイルシステム140は、ストレージクラスタ120−1、120−2、120−3、および120−4を含み得る。一実行例においては、ファイルシステム140は、分散型マルチマスタデータ複製システムであり、ストレージクラスタ120−1、120−2、120−3、および120−4の各々は、他のストレージクラスタについてのマスタサーバとして動作し得る。ファイルシステム140においては、データは、(たとえば、複数の地理的場所において)ストレージクラスタ120−1、120−2、120−3、および120−4にわたって複製され、データ利用可能性を増加するとともにクライエント(たとえば、クライエント110)からのネットワーク距離を低減し得る。一般的に、分散型オブジェクトおよび参照は、異なるストレージクラスタ120において、動的に生成され、変化され、模造され、そして削除され得、下部データ複製層(図示せず)は、書込み順の忠実性を維持して、すべてのストレージクラスタ120が同じデータのバージョンに至ることを保証する。したがって、データ複製層は、単一のオブジェクトについての同じ複製についての書込み順を遵守する。
図5は、例示的な実行例においてグローバルインデックスに書き込まれ得る、重複排除指示子レコードについての例示的なレコード構造500の図を提供する。重複排除指示子レコードは、オブジェクト複製の特定のコンテンツ処理を有するグローバルインデックスに関連し得る。図5に示されるように、レコード構造500は、ストレージクラスタ識別子(ID)セクション510と、記憶位置セクション520と、指示セクション530とを含み得る。ストレージクラスタ識別セクション510は、レコードが書き込まれるオブジェクト複製を記憶しているストレージクラスタ120についての固有の識別(たとえば、「クラスタID」)を含み得る。位置セクション520は、ストレージクラスタ識別セクション510によって識別されたストレージクラスタ120における複製の位置についてのアドレスを含み得る。指示セクション530は、たとえば、「データ」指示子、「削除リクエスト」指示子、または「重複排除」指示子を含み得る。
図6Aおよび図6Bは、クライエント起動アップロード/削除動作を管理するための例示的なプロセスのフローチャートである。図6Aは、クライエントからオブジェクトをアップロードする例示的なプロセス600についてのフローチャートを示す。図6Bは、クライエントによって削除されるオブジェクトを除去する例示的なプロセス650についてのフローチャートを示す。一実行例においては、プロセス600および650は、ストレージクラスタ120の1つによって実行され得る。プロセス600および650は、クライエント(たとえば、クライエント110)の動作に応答して実行され得る。以下に説明されるプロセス600および650の特有の例については、参照は、ファイルシステム140のストレージクラスタ120−1に対してなされ、ストレージクラスタ120は、クラスタID「01」を含む。
図11は、本明細書で説明される実行例に従う、例示的なグローバルインデックス部1100を与える。インデックスは、他の情報の中で、コンテンツ処理列1110および重複排除指示子レコード列1120を含み得る。例示的なインデックス部1100において、分散型マルチマスタデータ複製システムが、3つのストレージクラスタXX、YY、およびZZを含むものと仮定する。重複排除アルゴリズムは、ストレージクラスタXX、YY、およびZZの各々において周期的に実行され、グローバルインデックスのすべてまたは一部をスキャンし得る。また、レコード(たとえば、データ、削除リクエスト、および重複排除)は、ストレージクラスタXX、YY、およびZZのうちの1つによって、特定のオブジェクトコンテンツ処理に関連するグローバルインデックスに書き込まれ得る。グローバルインデックスへの修正は、他のすべての参加クラスタ(たとえば、残余のストレージクラスタXX、YY、およびZZ)へ複製され得る。
本明細書に記載されたシステムおよび/または方法は、分散型データ複製システムにおけるオブジェクトのグローバルインデックスを記憶するとともに、分散型データ複製システムを通して、グローバルインデックスおよびいくつかのオブジェクトを複製し得る。ストレージクラスタは、グローバルインデックスの特定のサブセットにおける重複排除のための、重要なエンティティとして割り当てられる。ストレージクラスタは、グローバルインデックスのサブセットのスキャンを実行し、そのスキャンに基づいて冗長な複製を識別し得る。ストレージクラスタは、局部的に記憶された冗長な複製、または遠隔ストレージクラスタ内の冗長な複製を重複排除し得る。
Claims (3)
- コンピュータ実行可能指令を含むコンピュータ読取可能メモリであって、
前記コンピュータ読取可能メモリは、
分散化データ複製システムに含まれるオブジェクトに関連付けられたインデックスの一部のスキャンを実行するための1つまたはより多くの指令と、
前記インデックスの一部の前記スキャンに基づいて、前記オブジェクトの1つの冗長な複製を識別するための1つまたはより多くの指令と、
前記冗長な複製に関連付けられた前記インデックスの前記一部に記録を書き込むための1つまたはより多くの指令とを含む、コンピュータ読取可能メモリ。 - 前記冗長な複製に関連した前記インデックスの一部へ変化を書き込むための1つまたはより多くの指令をさらに含み、
前記変化は、前記冗長な複製についての重複排除レコードを含み、
前記重複排除レコードは、前記冗長な複製が重複を排除されることを示す、請求項1に記載のコンピュータ読取可能メモリ。 - 前記インデックスに含まれる前記オブジェクトの中の他の1つについてのリクエストを受信するための1つまたはより多くの指令と、
前記インデックスに基づいて、前記オブジェクトの中の前記他の1つの複製をそれから読み出すためのストレージクラスタを選択するための1つまたはより多くの指令と、
前記選択されたストレージクラスタから、前記オブジェクトの中の前記他の1つの前記複製を読み出すための1つまたはより多くの指令と、
前記リクエストを開始する装置についての前記オブジェクトの前記他の1つの前記複製を提供するための1つまたはより多くの指示とをさらに含む、請求項1に記載のコンピュータ読取可能メモリ。
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CA2747746C (en) | 2015-08-11 |
US8712974B2 (en) | 2014-04-29 |
DE202009019139U1 (de) | 2017-01-20 |
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BRPI0922990B1 (pt) | 2020-11-10 |
AU2009330073B2 (en) | 2012-11-15 |
CN102317938B (zh) | 2014-07-30 |
CN104166673B (zh) | 2017-09-19 |
WO2010075407A1 (en) | 2010-07-01 |
JP2012513640A (ja) | 2012-06-14 |
US10291699B2 (en) | 2019-05-14 |
EP2368199A1 (en) | 2011-09-28 |
CN104166673A (zh) | 2014-11-26 |
US20100161554A1 (en) | 2010-06-24 |
US20240251012A1 (en) | 2024-07-25 |
JP5902222B2 (ja) | 2016-04-13 |
CN102317938A (zh) | 2012-01-11 |
AU2009330073A1 (en) | 2011-07-07 |
CA2747746A1 (en) | 2010-07-01 |
JP5579195B2 (ja) | 2014-08-27 |
US20160134696A1 (en) | 2016-05-12 |
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US20190268411A1 (en) | 2019-08-29 |
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