October 2014
Beginner to intermediate
240 pages
3h 38m
Japanese
Content preview from ZooKeeperによる分散システム管理
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
5章障害の取り扱い
障害がなければ、人生はずっと楽だろう。もちろん、障害がなければそもそもZooKeeperが必要にもならないだろうが。ZooKeeperを効率的に使うには、どのような種類の障害が生じるのか、それらをどう取り扱ったらよいのかを理解することが重要だ。
障害が発生しうる場所は大きく3つある。ZooKeeperサービスそのもの、ネットワーク、アプリケーションのプロセスである。復旧するには、その障害がこの3つのうちのどれなのかを知らなければいけないが、残念なことにそれはいつも簡単だとは限らない。
図5-1に示す簡単な構成を考えてみよう。アプリケーションは2つのプロセスでできており、3つのサーバがZooKeeperを構成している。プロセスは3つのサーバのうちの1つをランダムに選択して接続しているが、他のサーバに再接続する場合もある。サーバは内部プロトコルを用いて、クライアントの情報を同期しており、クライアントには一貫した状態を提供している。
図5-1 簡単な分散アプリケーション
図5-2にシステム上のさまざまなコンポーネントに生じうる障害の1つを示す。さまざまな障害をアプリケーション側から区別できるかを考えてみると面白いだろう。例えば、ネットワークに障害がある場合、c1から見て、ネットワーク障害と、ZooKeeperサービスの停止の区別が付くだろうか？ZooKeeper s1だけが落ちている場合には、他のZooKeeperサーバがオンラインなので、ネットワークに問題がなければ ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.