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miyahancom's profile
Miyahan
Miyahan
Miyahan
@miyahancom

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Miyahan

@miyahancom

壊れたルーターを取り替えるだけのエンジニア気取りの夜勤作業員 / 最近Pythonを始めてイキってるらしい / 存在しない架空の会社の愚痴・悪口ばかり言ってるのでフォローご注意ください

さいたまさいたま〜
miyalog.hatenablog.jp
Joined June 2010

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    Miyahan‏ @miyahancom 11h11 hours ago

    自分が作ったツールの中で一番ウケがよかった(笑いを取った)ものといえば、ルータがいつクラッシュするかを予言するという奇妙なツール。 メーカより内部カウンタ溢れ(いわゆるXX日問題)のバグ情報が来て「え、もし一気に数千台がクラッシュしたらNOCの業務回らなくなるよ…」ってことで検討開始pic.twitter.com/56NmKuZBo4

    8:51 AM - 8 Jun 2019
    • 161 Retweets
    • 271 Likes
    • aya19E まつく Shadowhat Cottoncolo 8086系しいな miki はるき virtually nyoro88 Seiji
    1 reply 161 retweets 271 likes
      1. New conversation
      2. Miyahan‏ @miyahancom 11h11 hours ago

        メーカーは「内部情報なのでコマンド等では確認できない」と言っていたが、いろいろデータを収集して分析したら特定プロセスのCPU時間とクラッシュ時刻に相関があることを発見。 定期的にプロセス情報を収集しゆらぎを加味しつつしきい値を超える時刻を算出。±90分の精度で予測が可能となった。pic.twitter.com/3w8FiGi3Tr

        1 reply 65 retweets 112 likes
        Show this thread
      3. Miyahan‏ @miyahancom 11h11 hours ago

        この分析によりルート量などによってプロセスの負荷が変わるためカウンタが溢れるタイミングもバラけることがわかり一安心。 またオペレーターは「お、そろそろ吹っ飛ぶぞ」とニヤニヤしながら障害を待つことができ、さらにバグによるものだと断定できるので対応が要らず大きな省力化となった。

        1 reply 40 retweets 70 likes
        Show this thread
      4. Miyahan‏ @miyahancom 11h11 hours ago

        あとでメーカーのエンジニアに見せたら「リスタートのトリガーになるのはまさにこのプロセスです、よくわかりましたねぇ」と笑いながら驚いていた。 まともな分析基盤がなかったため、MySQLに溜め込んだ数十GBのデータを激重クエリでフルスキャンするという泥臭い作業をしたなぁ…。

        2 replies 36 retweets 83 likes
        Show this thread
      5. End of conversation

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