- Multi-Data: \u30c6\u30fc\u30d6\u30eb\u3001Document\u3001\u30b0\u30e9\u30d5\u3001Key-Value\u3068\u3044\u3063\u305f\u69d8\u3005\u306a\u30c7\u30fc\u30bf\u306b\u5bfe\u5fdc<\/ul>\n<\/li>\n<\/ul>\n
- \n
- \u500b\u4eba\u7684\u306b\u3001Strong\u3001\u3044\u308f\u3086\u308bLinearizabile\u3068\u547c\u3070\u308c\u308b\u3088\u3046\u306a\u300c\u5f37\u3044\u4e00\u8cab\u6027\u300d\u3068\u3001Eventual Consistent\u3068\u547c\u3070\u308c\u308b\u3001\u3044\u3064\u304b\u306f\u6574\u5408\u304c\u53d6\u308c\u308b\u3051\u3069\u305d\u308c\u304c\u3044\u3064\u304b\u306f\u4fdd\u8a3c\u3057\u307e\u305b\u3093\u3088\u3001\u3068\u3044\u3046\u300c\u5f31\u3044\u4e00\u8cab\u6027\u300d\u306e\u4e2d\u9593\u306e\u5b9a\u7fa9\u306f\u3001\u6065\u305a\u304b\u3057\u306a\u304c\u3089\u3053\u308c\u3092\u898b\u308b\u307e\u3067\u77e5\u3089\u306a\u304b\u3063\u305f\u305f\u3081\u3001\u3053\u306e\u5b9a\u7fa9\u3092\u898b\u305f\u6642\u306b\u306f\u3001\u975e\u5e38\u306b\u65b0\u9bae\u3067\u8208\u5473\u304c\u305d\u305d\u3089\u308c\u305f<\/ul>\n<\/li>\n<\/ul>\n
- \n
- \u6700\u8fd1\u305a\u3063\u3068\u3001Quorum\u547c\u3070\u308c\u308b\u6982\u5ff5\u3068\u305d\u306e\u5fdc\u7528\u306b\u3064\u3044\u3066\u5927\u5909\u8208\u5473\u3092\u6301\u3063\u3066\u3044\u30662\u3001\uff15\u3064\u306e\u30ec\u30d9\u30eb\u306e\u4e2d\u3067Bounded Staleness\u3068\u547c\u3070\u308c\u308b\u6574\u5408\u6027\u3092\u5b9f\u73fe\u3059\u308b\u624b\u6bb5\u3068\u3057\u3066Probabilisic Quroum\u3068\u3044\u3046Quorum\u306e\u4e00\u7a2e\u304c\u5229\u7528\u53ef\u80fd\u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u3063\u305f<\/ul>\n<\/li>\n<\/ul>\n
- \n
- \u7c73MS\u3001\u300c\u60d1\u661f\u898f\u6a21\u300d\u3067\u30b9\u30b1\u30fc\u30eb\u3059\u308b\u300cAzure Cosmos DB\u300d\u3092\u767a\u8868<\/ul>\n<\/li>\n<\/ul>\n
- \n
- A technical overview of Azure Cosmos DB<\/ul>\n<\/li>\n<\/ul>\n
- \n
- Eventual<\/ul>\n<\/li>\n<\/ul>\n
- \n
- Eventual: \u8aad\u307f\u8fbc\u3081\u308b\u30c7\u30fc\u30bf\u306f\u3069\u308c\u3060\u3051\u53e4\u3044\u304b\u308f\u304b\u3089\u306a\u3044\u3051\u3069\u3044\u3064\u304b\u6700\u65b0\u306b\u306a\u308a\u307e\u3059(\u8aad\u307f\u8fbc\u307f\u6642\u5148\u7956\u8fd4\u308aOK, \u66f8\u8fbc\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u9069\u7528\u9806\u5e8f\u30d0\u30e9\u30d0\u30e9\u3082OK)<\/ul>\n<\/li>\n<\/ul>\n
- \n
- Consistent Prefix: \u3044\u3064\u304b\u6700\u65b0\u306b\u306a\u308c\u3070OK(\u5148\u7956\u8fd4\u308a\u3082\u8a31\u3059)\u3060\u3051\u3069\u3001replica\u3078\u306e\u66f8\u8fbc\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u9069\u7528\u9806\u5e8f\u306f\u7d71\u4e00<\/ul>\n<\/li>\n<\/ul>\n
- \n
- Session: \u81ea\u5206\u304b\u3089\u898b\u308b\u3068\u5148\u7956\u8fd4\u308a\u3057\u306a\u3044\u3001\u81ea\u5206\u306e\u66f8\u8fbc\u306f\u9806\u5e8f\u304c\u4fdd\u305f\u308c\u308b\u3001\u81ea\u5206\u306e\u66f8\u8fbc\u306f\u81ea\u5206\u304b\u3089\u306f\u5373\u8aad\u8fbc\u53ef\u80fd\u3002\u5168\u4f53\u3067\u307f\u308b\u3068\u306fConsistent Prfix\u3002<\/ul>\n<\/li>\n<\/ul>\n
- \n
- Bounded Staleness: \u3069\u306e\u30d7\u30ed\u30bb\u30b9\u304b\u3089\u898b\u3066\u3082\u3001\u66f8\u8fbc\u5f8ct\u6642\u9593\u7acb\u3066\u3070\u3001\u8aad\u3081\u308b\u30c7\u30fc\u30bf\u306e\u53e4\u3055\u306e\u4e0a\u9650(K\u4e16\u4ee3)\u304c\u4fdd\u8a3c\u3055\u308c\u308b\u3002K, t\u306f\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u53ef\u80fd\u3002<\/ul>\n<\/li>\n<\/ul>\n
- \n
- $\\epsilon$-Probabilistic Qurorum\u3067\u3042\u308b\u305f\u3081\u306e\u6761\u4ef6: $Pr_\\omega [Q \\cap Q’ \\neq \\emptyset]\\geq 1-\\epsilon $<\/ul>\n<\/li>\n<\/ul>\n
- \n
- PBS $k$-staleness: \u78ba\u7387\u7684\u306b$k$\u4e16\u4ee3\u4ee5\u5185\u304c\u8aad\u3081\u308b<\/ul>\n<\/li>\n<\/ul>\n
- \n
- PBS $t$-vibibility: \u78ba\u7387\u7684\u306b$t$\u6642\u9593\u4ee5\u964d\u306f\u6700\u65b0\u4e16\u4ee3\u304c\u8aad\u3081\u308b<\/ul>\n<\/li>\n<\/ul>\n
- \n
- \u8aad\u8fbc\u6642: $\\mathcal{R} = \\{ s \\in \\mathcal{S} \\,|\\, |s| = R \\}$\u304b\u3089random\u306b\u9078\u629e (N replica\u304b\u3089random\u306b$R$\u500b\u9078\u3076\uff09<\/ul>\n<\/li>\n<\/ul>\n
- \n
- $N = 3, R = W = 1 \\Rightarrow p_s = 2\/3 $<\/ul>\n<\/li>\n<\/ul>\n
- \n
- $N=3, R=W=1$\u306e\u5834\u5408\u3001$k=10\\Rightarrow 1-p_{sk} > 0.98$<\/ul>\n<\/li>\n<\/ul>\n
- \n
- $N=3, W=2, R=1$(\u9006\u3067\u3082\u540c\u3058)\u306e\u5834\u5408\u3001$k\\geq5 \\Rightarrow 1-p_{sk} > 0.995$<\/ul>\n<\/li>\n<\/ul>\n
- \n
- N=5(replica\u6570=5)<\/ul>\n<\/li>\n<\/ul>\n
- \n
- R=2(Read\u6642replica\u304b\u3089\u30e9\u30f3\u30c0\u30e0\u306b2\u500b\u8aad\u3093\u3067\u65b0\u3057\u3044\u65b9\u3092\u8fd4\u3059)<\/ul>\n<\/li>\n<\/ul>\n
- \n
- W=2(Write\u6642\u3082replica\u30922\u500b\u30e9\u30f3\u30c0\u30e0\u306b\u9078\u3093\u3067\u66f4\u65b0)\u3059\u308b\u3068\u3001<\/ul>\n<\/li>\n<\/ul>\n
- \n
- Write\u6642:<\/ul>\n<\/li>\n<\/ul>\n
- \n
- $t$\u5358\u4f4d\u6642\u9593\u5f8c\u306b$w$\u500b\u306ereplica\u304c\u6700\u65b0\u3067\u3042\u308b\u78ba\u7387\u3092 $P_\\omega(w,t)$\u3000\u3068\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n
expanding quorum\u306e\u66f8\u8fbc\u51e6\u7406\u306e\u5b9a\u7fa9\u304b\u3089 $\\forall c\\in[0,W],\\,P_{\\omega}(c,0)=1$\u3053\u3068\u306b\u6ce8\u610f<\/p>\n
\u8fd9\u6837\u505a\uff0c$p_{st}$\uff08\u8868\u793a\u5728\u8fc7\u53bbt\u4e2a\u65f6\u95f4\u5355\u4f4d\u540e\uff0c\u88ab\u8bbf\u95ee\u5230\u4e0d\u5305\u542b\u6700\u65b0\u4e00\u4ee3\u7684\u8bfb\u526f\u672c\u7684\u6982\u7387\uff09\u53ef\u4ee5\u6309\u4ee5\u4e0b\u65b9\u5f0f\u8ba1\u7b97\u3002<\/p>\n
\\begin{align}\r\np_{st} &= (t=0\u3067\u66f8\u304d\u8fbc\u307e\u308c\u305fWrite Qurom\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u78ba\u7387) \\\\&\\quad + (t\u5358\u4f4d\u6642\u9593\u5f8c\u306b\u6700\u65b0\u7248\u3092\u6301\u3063\u3066\u3044\u308breplica\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u78ba\u7387) \\\\\r\n&= \\frac{N-W \\choose R}{N \\choose R} + \\sum_{c\\in(W,N]}\\frac{N-c \\choose N}{N \\choose R} (P_\\omega(c+1,t)-P_\\omega(c,t))\r\n\\end{align}\r\n<\/code><\/pre>\n\u5982\u679c\u5728t\u5c0f\u65f6\u540e\u8fdb\u884c\u51c6\u786e\u7684read\u64cd\u4f5c\uff0c\u5e76\u4e14\u5728\u8fdb\u884c\u4e86W\u6b21\u65e0\u5ef6\u8fdf\u7684write\u64cd\u4f5c\u540e\u5f00\u59cb\u4e86anti-entropy\u5904\u7406\uff0c\u5219\u8fd9\u4e2a\u6982\u7387\u662f\u5b9e\u9645\u5904\u7406\u8fc7\u7a0b\u4e2d$p_{sk}$\u7684\u4e0a\u754c\uff08\u4e5f\u5c31\u662f\u8bf4\uff0c\u5b9e\u9645\u4e0a\u65e0\u6cd5\u8bbf\u95ee\u6700\u65b0\u4e00\u4ee3\u7684\u6982\u7387\u5c06\u5c0f\u4e8e\u8fd9\u4e2a\u503c\uff09\u3002<\/p>\n
\u6b64\u5916\uff0c\u7531\u4e8e$P_\\omega$\u662f\u4f9d\u8d56\u4e8e\u53cd\u71b5\u8fc7\u7a0b\u672c\u8eab\u7684\uff0c\u56e0\u6b64\u4e0d\u80fd\u8fdb\u884c\u8fdb\u4e00\u6b65\u7684\u5206\u6790\u3002\u5b9e\u7528\u6027\u90e8\u5206\u5c06\u5c55\u793a\u5177\u4f53\u7684\u53cd\u71b5\u8fc7\u7a0b\u7684\u6a21\u62df\u7ed3\u679c\u3002<\/p>\n
PBS K\uff0cT-\u65b0\u9c9c\u5ea6<\/h2>\n
\u4f7f\u7528\u5177\u6709$t$-\u53ef\u89c1\u6027\u7684\u6269\u5c55\u5171\u8bc6\u673a\u5236\u7684\u7cfb\u7edf\u4e2d\uff0c\u7ed3\u5408\u4e86$k$-\u4e0d\u65b0\u9c9c\u5ea6\u6982\u5ff5\u7684\u662f$<k,t>$-\u4e0d\u65b0\u9c9c\u5ea6\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5f53\u8fdb\u884c\u4e86$k$\u6b21\u5199\u5165\u5e76\u5728$t$\u4e2a\u65f6\u95f4\u5355\u4f4d\u540e\u51fa\u73b0\u8bfb\u53d6\u8bf7\u6c42\u65f6\uff0c\u5b83\u4ee5\u6982\u7387\u4fdd\u8bc1\u53ef\u4ee5\u4ece\u6700\u65b0\u7248\u672c\u4e2d\u8bbf\u95ee\u5230$k$\u4ee3\u4ee5\u5185\u7684\u6570\u636e\u3002<\/p>\n
\u5f53\u8bf7\u6c42\u5728\u8fdb\u884ck\u6b21\u5199\u5165\u64cd\u4f5c\u540e\u7684t\u4e2a\u65f6\u95f4\u5355\u4f4d\u540e\u53d1\u9001\u65f6\uff0c\u5e76\u4e14\u5b9a\u4e49\u7684quorum\u7cfb\u7edf\u6ee1\u8db3PBS\uff1ck,t\uff1e-stalness\u7684\u4e00\u81f4\u6027\u65f6\uff0c\u5373\u4f7f\u8fd9\u65f6\u7684\u6982\u7387\u4e3a1-p_{skt}\uff0c\u6240\u6709\u7684read quorum\u4e2d\u81f3\u5c11\u5b58\u5728\u4e00\u4e2a\u6570\u636e\u6765\u81ea\u6700\u65b0\u4e16\u4ee3\u5e76\u5305\u542b\u5728k\u4e16\u4ee3\u4e4b\u5185\u3002<\/p>\n
\u6784\u6210\u6cd5 f\u01ce)<\/h3>\n
\u53ef\u4ee5\u4f7f\u7528\u4e0et-visibility\u5b8c\u5168\u76f8\u540c\u7684\u6269\u5c55\u914d\u989d\u3002\u4f7f\u7528\u8fd9\u4e2a\u6a21\u578b\uff0c\u53ef\u4ee5\u8ba1\u7b97\u51fa\u5728$t$\u5c0f\u65f6\u540e\u80fd\u591f\u5728$k$\u4ee3\u4e4b\u5185\u8fdb\u884c\u8bfb\u53d6\u7684\u6982\u7387\u3002\u5982\u679c\u8981\u8fdb\u884c\u7cbe\u786e\u8ba1\u7b97\uff0c\u8fd8\u53ef\u4ee5\u8003\u8651$k$\u4e2a\u5199\u64cd\u4f5c\u4e4b\u95f4\u7684\u65f6\u95f4\u5dee\uff0c\u4f46\u5728\u8fd9\u91cc\u6211\u4eec\u5047\u8bbe\u6240\u6709\u5199\u64cd\u4f5c\u540c\u65f6\u53d1\u751f\uff0c\u5c31\u50cf\u5728\u8ba1\u7b97$k$-staleness\u65f6\u90a3\u6837\uff0c\u53ef\u4ee5\u7b80\u5355\u5730\u8ba1\u7b97\u5982\u4e0b\uff1a<\/p>\n
$$
\np_{skt} = p^k_{st} = \\left(\\frac{{N-W \\choose R}}{{N \\choose R}} + \\sum_{c\\in(W,N]}\\frac{{N-c \\choose N}}{{N \\choose R}} (P_\\omega(c+1,t)-P_\\omega(c,t))\\right)^k
\n$$<\/p>\n$$
\np_{skt} = p^k_{st} = \\left(\\frac{{\u4eceN\u4e2d\u9009\u62e9W\u4e2a\u4e0d\u5305\u542b\u5728N\u4e2d\u7684\u5143\u7d20\u7684\u7ec4\u5408\u6570}}{{\u4eceN\u4e2d\u9009\u62e9R\u4e2a\u5143\u7d20\u7684\u7ec4\u5408\u6570}} + \\sum_{c\\in(W,N]}\\frac{{N-c \u4e2d\u9009\u62e9 N\u4e2a\u5143\u7d20\u7684\u7ec4\u5408\u6570}}{{\u4eceN\u4e2d\u9009\u62e9R\u4e2a\u5143\u7d20\u7684\u7ec4\u5408\u6570}} (P_\\omega(c+1,t)-P_\\omega(c,t))\\right)^k
\n$$<\/p>\n\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6700\u7ec8\u8fd8\u662f\u4e0e$t$-visibility\u65f6\u4e00\u6837\uff0c\u53d6\u51b3\u4e8e\u53cd\u71b5\u8fc7\u7a0b\u7684$P_\\omega$\u7684\u6982\u7387\u3002<\/p>\n
Probabilistic Bounded Staleness\u7684\u53ef\u884c\u6027<\/h1>\n
\u5728\u8ad6\u6587\u4e2d\uff0c\u900f\u904e\u6a21\u64ec\u5c55\u793a\u4e86\u57fa\u65bc\u5e38\u7528\u7684Dynamo\u64f4\u5c55\u8ad6\u8a3c\u7cfb\u7d71\uff08WARS\u6a21\u578b\uff09\u7684\u7ba1\u7406\u65b9\u6cd5\u80fd\u5920\u6eff\u8db3\u591a\u5c11\u7a0b\u5ea6\u7684$$-\u5ef6\u9072\u6027\u3002<\/p>\n
Dynamo\u98ce\u683c\u7684quorum\u7cfb\u7edf\uff1aWARS\u6a21\u578b<\/h2>\n
Dynamo\u98ce\u683c\u7684quorum\u7cfb\u7edf\u91c7\u7528\u4e86\u4e4b\u524d\u4ecb\u7ecd\u7684\u57fa\u4e8e\u6269\u5c55quorum\u7684\u526f\u672c\u7ba1\u7406\u7b97\u6cd5\u3002\u5728\u8fd9\u4e2a\u7b97\u6cd5\u4e2d\uff0c\u4e0d\u660e\u786e\u9009\u62e9quorum\uff0c\u800c\u662f\u5c06\u8bf7\u6c42\u53d1\u9001\u7ed9\u6240\u6709\u526f\u672c\uff0c\u5e76\u4f7f\u7528\u6700\u5feb\u7684\u526f\u672c\u8fd4\u56de\u7684\u54cd\u5e94\u6765\u56de\u590d\u5ba2\u6237\u7aef\u3002<\/p>\n
- \n
- \n
- Write\u6642: N\u500b\u306ereplica\u5168\u3066\u306bwrite\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u9001\u308b\u3002W\u500b\u306e\u8fd4\u7b54\u304c\u8fd4\u3063\u3066\u304d\u305f\u6642\u70b9\u3067client\u306b\u5b8c\u4e86\u8fd4\u7b54<\/ul>\n<\/li>\n<\/ul>\n
- \n
- LNKD-SSD: Voldmort\u30d9\u30fc\u30b9\u306eproduction latency\u30e2\u30c7\u30eb\u3002SSD\u30d9\u30fc\u30b9\u3067\u30c7\u30a3\u30b9\u30af\u30a2\u30af\u30bb\u30b9\u306f\u9ad8\u901f\u3002network bound\u306a\u306e\u3067W=A=R=S\u3092\u60f3\u5b9a<\/ul>\n<\/li>\n<\/ul>\n
- \n
- LNKD-DISK: Voldmort\u30d9\u30fc\u30b9\u306eproduction latency\u30e2\u30c7\u30eb\u3002A=R=S\u306fLNKD-SSD\u3068\u540c\u3058\u3067,Write\u3060\u3051\u9045\u3044<\/ul>\n<\/li>\n<\/ul>\n
- \n
- YMMER: Basho Riack\u30d9\u30fc\u30b9\u306eproduction latency\u30e2\u30c7\u30eb\u3001W, A=R=S\u3068\u3044\u3046\u30e2\u30c7\u30eb\u3067\u306fLNKD-DISK\u3068\u540c\u3058\u50be\u5411\u3060\u304c\u3001\u5168\u4f53\u7684\u306bLNKD-SSD\u3088\u308a\u9045\u3044\u3002Longtail\u304c\u592a\u3044\u306e\u304c\u7279\u9577\u3067\u300199.99%tile\u3067\u306f10\u79d2\u304f\u3089\u3044\u3068\u3044\u3046\u5024\u3082\u3067\u308b<\/ul>\n<\/li>\n<\/ul>\n
- \n
- $t$-visibility\u306f\u7dcf\u3058\u3066write latency\u306b\u5927\u304d\u304f\u4f9d\u5b58\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n
- \n
- LNKD-SSD\u3067\u306f\u3001\u66f8\u8fbc\u5b8c\u4e86\u76f4\u5f8c(t=0)\u306797.4%, 5ms\u5f8c\u306b\u306f99.999%\u3092\u9054\u6210<\/ul>\n<\/li>\n<\/ul>\n
- \n
- LNKD-DISK\u3067\u306f\u3001write\u306e\u9045\u3055\u304c\u5f71\u97ff\u3057\u3001\u66f8\u8fbc\u76f4\u5f8c\u3067\u306f43.99%\u3057\u304b\u7121\u304f\u300110ms\u305f\u3063\u3066\u308292.5%\u3057\u304b\u306a\u304b\u3063\u305f<\/ul>\n<\/li>\n<\/ul>\n
- \n
- YMMR\u3067\u3082\u540c\u3058\u50be\u5411\u3060\u304c\u3001\u66f8\u8fbc\u76f4\u5f8c\u306789.3%\u300299.9%\u3092\u9054\u6210\u3059\u308b\u306e\u306b13.64\u79d2\u304b\u304b\u3063\u3066\u3044\u305f<\/ul>\n<\/li>\n<\/ul>\n
- \n
- SSD\u3092\u4f7f\u3063\u3066\u30c7\u30a3\u30b9\u30af\u30a2\u30af\u30bb\u30b9\u304c\u9ad8\u901f\u304b\u3064\u5747\u4e00\u306a\u5834\u5408\u3001N=3, R=W=1\u306eWARS\u30e2\u30c7\u30eb\u3067\u306f\u30011.85ms-visilibity\u304c99.99%\u306e\u78ba\u7387\u3067\u9054\u6210\u3067\u304d\u308b<\/ul>\n<\/li>\n<\/ul>\n
- \n
- qurorum\u306e\u69cb\u6210: $N, R, W$<\/ul>\n<\/li>\n<\/ul>\n
- \n
- WARS\u306elatency\u30e2\u30c7\u30eb: W,A,R,S<\/ul>\n<\/li>\n<\/ul>\n
- \n
- k-staleness: “Tolerable Staleness”\u3068\u8868\u73fe\u3055\u308c\u3066\u3044\u307e\u3059<\/ul>\n<\/li>\n<\/ul>\n
<\/p>\n
- simulation\u3059\u308b\u305f\u3081\u306eiteration\u56de\u6570<\/ul>\n
![\"image.png\"](\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d92de913a08637a6e477a\/118-0.png\" "\\"\\"")
<\/div>\n\u6839\u636e\u8fd9\u4e2a\u56fe\uff0c
\n– \u5f53$N=3, R=W=1$\uff0c\u8bbe\u7f6e\u4e3a$3$-staleness\u3002
\n– \u5199\u5165\u540e\uff0c\u670975.27%\u7684\u6982\u7387\u8fbe\u5230$3$-staleness\u3002
\n– 10ms\u540e\uff0c\u670990.94%\u7684\u6982\u7387\u8fbe\u5230$3$-staleness\u3002
\n– 100ms\u540e\uff0c\u670999.99%\u7684\u6982\u7387\u8fbe\u5230$3$-staleness\u3002
\n– \u6211\u4eec\u53ef\u4ee5\u770b\u5230\u5df2\u7ecf\u5b9e\u73b0\u4e86\u8fd9\u4e2a\u76ee\u6807\u3002<\/p>\n\u6700\u540e<\/h1>\n
\u672c\u7bc7\u6587\u7ae0\u5c06\u89e3\u91caAzure Cosmos DB\u6240\u652f\u6301\u7684\u4e00\u79cd\u6570\u636e\u4e00\u81f4\u6027\u7ea7\u522b\u6982\u5ff5\u2014\u2014\u6709\u754c\u9648\u65e7\u5ea6\u3002<\/p>\n
\u5728\u8fd9\u7bc7\u8bba\u6587\u4e2d\uff0c\u6211\u53c2\u8003\u4e86\u8bba\u6587\u6765\u89e3\u91ca\u4e86Probabilistic Bounded Staleness\u8fd9\u4e00\u6982\u5ff5\u7684\u5f62\u5f0f\u5316\u4ee5\u53ca\u5b83\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u6269\u5c55\u578b\u6295\u7968\u7cfb\u7edf\u6765\u5b9e\u73b0\u3002<\/p>\n
\u53e6\u5916\uff0c\u6211\u4eec\u5728\u53c2\u8003\u6587\u732e\u4e2d\u8bba\u8bc1\u4e86\u4e00\u79cd\u540d\u4e3aWARS\u6a21\u578b\u7684Dynamo\u98ce\u683c\u7684\u6cd5\u5b9a\u4eba\u6570\u7cfb\u7edf\u2014\u2014\u8fd9\u662f\u4e00\u79cd\u7b80\u5355\u7684\u7b97\u6cd5\uff0c\u5b83\u5728\u4ea4\u4e92\u5f0f\u6a21\u62df\u6f14\u793a\u4e2d\u4e5f\u88ab\u8bc1\u5b9e\u80fd\u591f\u5728\u975e\u5e38\u5b9e\u7528\u7684\u7a0b\u5ea6\u4e0a\u6ee1\u8db3\u6982\u7387\u6709\u754c\u9648\u65e7\u5ea6\u3002<\/p>\n
\u5c31\u6211\u4e2a\u4eba\u800c\u8a00\uff0c\u6211\u975e\u5e38\u6709\u5174\u8da3\u7684\u662f\uff0c\u5373\u4f7f\u662f\u7b80\u5355\u7684read\/write quorum + \u53cd\u71b5\u6a21\u578b\uff0c\u5728\u6982\u7387\u4e0a\u786e\u5b9e\uff0c\u4f46\u5b9e\u9645\u4e0a\u53ef\u4ee5\u671f\u671b\u5f3a\u4e00\u81f4\u6027\uff0c\u5728 Azure Cosmos DB \u751f\u4ea7\u4e2d\u91c7\u7528\u4e86\u8fd9\u79cd\u6a21\u578b\uff0c\u8fd9\u4e00\u70b9\u4ee4\u4eba\u975e\u5e38\u611f\u5174\u8da3\u3002<\/p>\n
\u9605\u8bfb\u300aAzure Cosmos DB\u7684\u6280\u672f\u6982\u8ff0\u300b\u65f6\uff0c\u53d1\u73b0\u5176\u4e2d\u63d0\u5230\u4e86\u5fae\u8f6f\u8fc7\u53bb\u5ba2\u6237\u7684\u8d8b\u52bf\u3002<\/p>\n
\u7ea673%\u7684\u6211\u4eec\u7684\u5ba2\u6237\u4f7f\u7528\u4f1a\u8bdd\u4e00\u81f4\u6027\uff0c20%\u7684\u5ba2\u6237\u66f4\u559c\u6b22\u6709\u754c\u9648\u65e7\u5ea6\u3002\u6211\u4eec\u89c2\u5bdf\u5230\uff0c\u5927\u7ea63%\u7684\u5ba2\u6237\u5728\u6700\u521d\u5c1d\u8bd5\u4e0d\u540c\u7684\u4e00\u81f4\u6027\u7ea7\u522b\u540e\u624d\u4e3a\u4ed6\u4eec\u7684\u5e94\u7528\u9009\u62e9\u4e00\u4e2a\u7279\u5b9a\u7684\u4e00\u81f4\u6027\u9009\u9879\u3002\u6211\u4eec\u8fd8\u89c2\u5bdf\u5230\uff0c\u5e73\u5747\u53ea\u67092%\u7684\u5ba2\u6237\u4f1a\u6839\u636e\u6bcf\u4e2a\u8bf7\u6c42\u7684\u60c5\u51b5\u8986\u76d6\u539f\u6709\u7684\u4e00\u81f4\u6027\u7ea7\u522b\u3002<\/p><\/blockquote>\n
\u9009\u62e9Bounded Staleness\u7684\u4eba\u4f3c\u4e4e\u5e76\u4e0d\u591a\u3002\u540c\u6837\uff0c\u4eba\u4eec\u4e5f\u5f88\u5c11\u9009\u62e9\u5b83\u3002<\/p>\n
\u4e3a\u4e86\u5411\u5ba2\u6237\u62a5\u544a\u4e00\u81f4\u6027 SLAs \u7684\u4efb\u4f55\u8fdd\u89c4\u884c\u4e3a\uff0c\u6211\u4eec\u4f7f\u7528\u7ebf\u6027\u4e00\u81f4\u6027\u68c0\u67e5\u5668\uff0c\u8be5\u68c0\u67e5\u5668\u5728\u6211\u4eec\u7684\u670d\u52a1\u9065\u6d4b\u4e0a\u6301\u7eed\u8fd0\u884c\u3002\u5bf9\u4e8e\u6709\u754c\u9648\u65e7\u6027\uff0c\u6211\u4eec\u76d1\u63a7\u5e76\u62a5\u544a\u4efb\u4f55\u8fdd\u89c4 k \u548c t \u8fb9\u754c\u3002\u5bf9\u4e8e\u6240\u6709\u56db\u4e2a\u5f1b\u5316\u4e00\u81f4\u6027\u7ea7\u522b\uff0c\u9664\u4e86\u5176\u4ed6\u5ea6\u91cf\u6807\u51c6\u5916\uff0c\u6211\u4eec\u8fd8\u8ddf\u8e2a\u5e76\u62a5\u544a\u6982\u7387\u6709\u754c\u9648\u65e7\u6027 (PBS) \u5ea6\u91cf\u3002<\/p><\/blockquote>\n
\u56e0\u4e3a\u88ab\u8bb0\u5f55\u4e0b\u6765\u4e86\uff0c\u6240\u4ee5\u5f53\u8bbe\u7f6e\u4e86\u5f3a\u4e00\u81f4\u6027\u65f6\uff0c\u786e\u4fdd\u4e86\u7ebf\u6027\u53ef\u64cd\u4f5c\u6027\uff1b\u5f53\u8bbe\u7f6e\u4e86\u6709\u754c\u65b0\u9c9c\u5ea6\u65f6\uff0c\u4e5f\u53ef\u80fd\u5b58\u5728\u8b66\u62a5\uff0c\u4ee5\u786e\u4fdd$k$\u548c$t$\u6ca1\u6709\u504f\u79bb\u671f\u671b\u503c\u3002\u8fd9\u770b\u8d77\u6765\u975e\u5e38\u6709\u8da3\u3002<\/p>\n
\u6211\u5b9e\u9645\u4e0a\u4e0d\u77e5\u9053\u81ea\u5df1\u4f1a\u4e0d\u4f1a\u4f7f\u7528Azure Cosmos DB\uff0c\u4f46\u63a5\u4e0b\u6765\u6211\u60f3\u8c03\u67e5\u4e00\u4e0b”Session”\u3001”Consistent Prefix”\u8fd9\u6837\u7684\u4e00\u81f4\u6027\u7ea7\u522b\u662f\u5982\u4f55\u5b9e\u73b0\u7684\u3002<\/p>\n
\u7531\u4e8e\u6211\u4e00\u8fb9\u52c9\u5f3a\u5199\u4e00\u8fb9\u5b8c\u6210\uff0c\u53ef\u80fd\u4f1a\u6709\u4e9b\u9519\u8bef\u3002\u6b22\u8fce\u5927\u5bb6\u7ea0\u6b63\u548c\u63d0\u4f9b\u53cd\u9988\u3002<\/p>\n
\n\u8bf7\u6ce8\u610f\uff0c\u8fd9\u91cc\u4ecb\u7ecd\u7684\u65b9\u6cd5\u662f\u5426\u76f4\u63a5\u4f7f\u7528\u4e86Azure Cosmos DB\u4e2d\u7684\u6280\u672f\u5c1a\u4e0d\u786e\u5b9a\u3002\u7136\u800c\uff0c\u5728\u8be5\u670d\u52a1\u7684\u5b98\u65b9\u6587\u6863\u4e2d\uff0c\u53ef\u4ee5\u627e\u5230\u5f15\u7528\u4e86\u672c\u6587\u6240\u63d0\u5230\u7684\u8bba\u6587\u6216\u8005\u63d0\u5230\u4e86\u7c7b\u4f3c\u5185\u5bb9\u7684\u8868\u8ff0\uff1a”\u5bf9\u4e8e\u6709\u754c\u9648\u65e7\u6027\uff0c\u6211\u4eec\u4f1a\u76d1\u63a7\u5e76\u62a5\u544a\u4efb\u4f55\u8fdd\u53cdk\u548ct\u9650\u5236\u7684\u60c5\u51b5\u3002\u5bf9\u4e8e\u6240\u6709\u4e94\u4e2a\u653e\u677e\u4e00\u81f4\u6027\u7ea7\u522b\uff0c\u6211\u4eec\u8fd8\u4f1a\u76f4\u63a5\u5411\u60a8\u62a5\u544a\u6982\u7387\u6709\u754c\u9648\u65e7\u6027\u6307\u6807”\uff0c\u56e0\u6b64\u53ef\u4ee5\u63a8\u6d4b\u51fa\u4f7f\u7528\u4e86\u672c\u65b9\u6cd5\u6216\u7c7b\u4f3c\u7684\u65b9\u6cd5\u3002<\/p>\n
\u4e3a\u4e86\u5e2e\u52a9\u7406\u89e3\u57fa\u672c\u7684Quorum\uff0c\u6211\u5199\u4e86\u4ee5\u4e0b\u7c7b\u4f3c\u7684\u6587\u7ae0\u3002\u6700\u8fd1\u6d41\u884c\u7684Quorum\u4e0d\u4ec5\u6bd4\u591a\u6570\u6295\u7968\u66f4\u5e38\u89c1\uff0c\u8fd8\u662f\u4e00\u4e2a\u5f3a\u5927\u7684\u6982\u5ff5\u3002<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
Azure Cosmos DB \u662f\u4ec0\u4e48? \u8fd9\u662f\u5fae\u8f6f\u57282017\u5e745\u670810\u65e5\uff08\u7f8e\u56fd\u65f6\u95f4\uff09\u5ba3\u5e03\u7684\u65b0\u6570\u636e\u5e93\u670d\u52a1\u3002\u4e0e\u4ee5\u5f80 […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-50597","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n
\u636e\u8bf4Azure Cosmos DB\u5f15\u5165\u4e86\u6709\u754c\u9648\u65e7\u5ea6(Bounded Staleness)\uff0c\u53ef\u4ee5\u901a\u8fc7\u6982\u7387\u6027\u4ef2\u88c1(Probabilistic Quorum)\u6765\u5b9e\u73b0 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u636e\u8bf4azure-cosmos-db\u5f15\u5165\u4e86\u6709\u754c\u9648\u65e7\u5ea6bounded-staleness\uff0c\u53ef\u4ee5\u901a\u8fc7\u6982\u7387\u6027\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u636e\u8bf4Azure Cosmos DB\u5f15\u5165\u4e86\u6709\u754c\u9648\u65e7\u5ea6(Bounded Staleness)\uff0c\u53ef\u4ee5\u901a\u8fc7\u6982\u7387\u6027\u4ef2\u88c1(Probabilistic Quorum)\u6765\u5b9e\u73b0\" \/>\n<meta property=\"og:description\" content=\"Azure Cosmos DB \u662f\u4ec0\u4e48? \u8fd9\u662f\u5fae\u8f6f\u57282017\u5e745\u670810\u65e5\uff08\u7f8e\u56fd\u65f6\u95f4\uff09\u5ba3\u5e03\u7684\u65b0\u6570\u636e\u5e93\u670d\u52a1\u3002\u4e0e\u4ee5\u5f80 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u636e\u8bf4azure-cosmos-db\u5f15\u5165\u4e86\u6709\u754c\u9648\u65e7\u5ea6bounded-staleness\uff0c\u53ef\u4ee5\u901a\u8fc7\u6982\u7387\u6027\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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\u66f4\u591a\u4e0d\u540c\u7684\u60c5\u51b5<\/h2>\n
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<\/div>\n\u770b\u5230\u8fd9\u4e2a\uff0c<\/p>\n
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- WAN: read\u3068write\u306f\u7570\u306a\u308bdatacenter\u304b\u3089\u304f\u308b\u3082\u306e\u3068\u60f3\u5b9a\u3002replica request\u306e\u4e00\u3064\u306fdatacenter\u3092\u8de8\u304e\u3053\u3068\u3092\u60f3\u5b9a\u3002datacenter\u8de8\u304e\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u306fLNKD-SSD\u30e2\u30c7\u30eb\u306b75\uff4d\uff53\u3092\u4e0a\u4e57\u305b\u3057\u3066\u3044\u308b<\/ul>\n
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<\/div>\n\u5728WARS\u6a21\u578b\u4e2d\u7684t-visibility<\/h2>\n
\u5728\u8fd9\u7bc7\u8bba\u6587\u4e2d\uff0c\u8457\u8005\u901a\u8fc7\u5c06\u5404\u4e2a\u590d\u5236\u4f53\uff08replica\uff09\u5355\u72ec\u8bbe\u7f6e\u5177\u6709\u4e0d\u540c\u503c\u7684\u6982\u7387\u5206\u5e03$\\mathbf{W_i},\\mathbf{A_i},\\mathbf{R_i},\\mathbf{S_i}$\u6765\u8bc4\u4f30$t$-visibility\u3002\u7531\u4e8e$t$-visibility\u53d6\u51b3\u4e8e\u53cd\u71b5\uff08anti-entropy\uff09\u8fc7\u7a0b\uff0c\u56e0\u6b64\u53ef\u4ee5\u6839\u636e$t$-visibility\u7684\u6982\u7387\u6765\u8ba1\u7b97$<k,t>$-staleness\u3002\u4ed6\u4eec\u4f7f\u7528MonteCalro\u6a21\u62df\u8fdb\u884c\u4e86\u8bc4\u4f30\u3002<\/p>\n
\u5728\u8be5\u5b9e\u9a8c\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528LinkedIn\u3001Yammer\u7b49\u5927\u578b\u4f01\u4e1a\u7684\u751f\u4ea7\u5ef6\u8fdf\u6570\u636e\u4f5c\u4e3a\u57fa\u7840\uff0c\u4f7f\u7528\u5e15\u7d2f\u6258\u5206\u5e03\u5bf9\u4e0a\u8ff0\u6982\u7387\u5206\u5e03\u8fdb\u884c\u5efa\u6a21\uff0c\u5e76\u8fdb\u884c\u4e86\u6a21\u62df\u3002\u5177\u4f53\u6761\u4ef6\u8bf7\u53c2\u8003\u8bba\u6587\u4e2d\u7684\u56fe5\u3002\u6211\u4eec\u5bf9\u56db\u79cd\u5ef6\u8fdf\u6a21\u578b\u8fdb\u884c\u4e86\u6bd4\u8f83\uff0c\u6bcf\u79cd\u6a21\u578b\u90fd\u5177\u6709\u4ee5\u4e0b\u7279\u70b9\u3002<\/p>\n
- \n
- \n
- \n
N\u500b\u306ereplica\u304b\u3089\u30e9\u30f3\u30c0\u30e0\u306bW\u500b\u9078\u3073\u66f8\u304d\u8fbc\u3080(Write Qurorum\u306b\u66f8\u304d\u8fbc\u3080)
\nclient\u306fW\u500b\u66f8\u8fbc\u5b8c\u4e86\u6642\u70b9\u3067\u6210\u529f\u3092\u53d7\u3051\u53d6\u308b
\n\u305d\u306e\u5f8c\u6b8b\u308a\u306ereplica\u306b\u9806\u306b\u5024\u3092\u4f1d\u64ad\u3055\u305b\u3066\u3044\u304f(anti-entropy\u51e6\u7406)<\/p>\nRead\u6642:<\/p>\n
N\u500b\u306ereplica\u304b\u3089\u30e9\u30f3\u30c0\u30e0\u306bR\u500b\u304b\u3089\u8aad\u307f\u8fbc\u3093\u3067\u4e00\u756a\u65b0\u3057\u3044\u4e16\u4ee3\u3092\u8fd4\u3059<\/p>\n
\u662f\u7684\u3002<\/p>\n
\u4e3a\u4e86\u8bc4\u4f30\u8fd9\u4e2a\u7b80\u5355\u7b97\u6cd5\u6709\u591a\u5c11\u4e0d\u4e00\u81f4\u6027\u7a97\u53e3\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u7d2f\u79ef\u6982\u7387\u51fd\u6570\u6765\u8bc4\u4f30\u7279\u5f81\u5316\u6700\u65b0\u4e00\u4ee3\u526f\u672c\u6570\u91cf\u7684\u53cd\u71b5\u8fc7\u7a0b\u3002<\/p>\n
- \n
- \n
<\/p>\n
- 99.7%\u306e\u78ba\u7387\u30675-staleness\u3092\u6e80\u305f\u3059<\/ul>\n
\u6211\u660e\u767d\u4e86\u3002\u5373\u4f7f\u662f\u8fd9\u4e48\u7b80\u5355\u7684\u903b\u8f91\uff0c\u53ea\u8981\u662f\u57285\u4ee3\u4ee5\u5185\u7684\u6761\u4ef6\u4e0b\uff0c\u670999.7%\u4ee5\u4e0a\u7684\u6982\u7387\uff0c\u8fd9\u771f\u662f\u975e\u5e38\u6709\u8da3\u5462\u3002<\/p>\n
PBS \u53ef\u89c1\u6027<\/h2>\n
\u5982\u679c\u4f7f\u7528Read\/Write Quorum\u6765\u7ba1\u7406\u526f\u672c\uff0c\u90a3\u4e48\u5728\u5904\u7406\u5199\u8bf7\u6c42\u65f6\uff0c\u6211\u4eec\u9700\u8981\u5c06\u6570\u636e\u5199\u5165\u5230W\u4e2a\u526f\u672c\u4e2d\uff08\u5728\u5c06\u6570\u636e\u5199\u5165W\u4e2a\u526f\u672c\u540e\uff0c\u5c06\u5904\u7406\u5b8c\u6210\u7684\u6d88\u606f\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\uff09\uff0c\u7136\u540e\u901a\u5e38\u4f1a\u6267\u884c\u4e00\u4e2a\u79f0\u4e3a\u53cd\u71b5\uff08anti-entropy\uff09\u7684\u5f02\u6b65\u64cd\u4f5c\uff0c\u5c06\u5199\u8bf7\u6c42\u4f20\u64ad\u7ed9\u53e6\u5916N\u4e2a\u526f\u672c\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u7ecf\u5e38\u88ab\u79f0\u4e3a\u6269\u5c55Quorum\uff08expanding quorum\uff09\uff0c\u56e0\u4e3aWrite Quorum\u7684\u89c4\u6a21\u5728\u9010\u6e10\u6269\u5927\u3002<\/p>\n
\u5728T-visibility\u4e2d\uff0c\u5728\u6269\u5c55\u6295\u7968\u6a21\u578b\u4e0a\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u88ab\u79f0\u4e3a\u201c\u4e0d\u4e00\u81f4\u7a97\u53e3\u201d\u7684\u6307\u6807\uff0c\u7528\u4e8e\u8868\u793a\u6700\u65b0\u4e00\u4ee3\u53ef\u4ee5\u88ab\u8bfb\u53d6\u7684\u65f6\u95f4\u95f4\u9694\u3002<\/p>\n
\u5728\u4e2d\u6587\u4e2d\u5c06\u4ee5\u4e0b\u5185\u5bb9\u8fdb\u884c\u6539\u8ff0\uff1a\u4e00\u4e2aQuorum\u7cfb\u7edf\u6ee1\u8db3PBS t-visibility\u4e00\u81f4\u6027\uff0c\u610f\u5473\u7740\u81f3\u5c11\u5728$t$\u4e2a\u65f6\u95f4\u5355\u4f4d\u4e4b\u540e\uff0c\u6240\u6709\u8bfb\u53d6\u6cd5\u5b9a\u4eba\u6570\u4e2d\u81f3\u5c11\u6709\u4e00\u4e2a\u6570\u636e\u4ee5$1-p_{sk}$\u7684\u6982\u7387\u5305\u542b\u6700\u65b0\u4e00\u4ee3\u7684\u6570\u636e\u3002<\/p>\n
\u69cb\u6210\u6cd5 is a legal term which refers to the “constitution” or the “fundamental law” of a country.<\/h3>\n
\u8ba9\u6211\u4eec\u518d\u6b21\u786e\u8ba4\u4f7f\u7528\u6269\u5c55\u6cd5\u5b9a\u4eba\u6570\u7684\u526f\u672c\u7ba1\u7406\u7b97\u6cd5\u3002<\/p>\n
- \n
- \n
<\/p>\n
- \n
- \n
<\/p>\n
- \n
- \n
<\/p>\n
- $N=5, W=2, R=2$\u306e\u5834\u5408$p_{s1}=3\/10$, $k\\geq5 \\Rightarrow 1-p_{sk}>0.997$<\/ul>\n
\u5c31\u662f\u8fd9\u6837\u3002\u4e5f\u5c31\u662f\u8bf4\u3002<\/p>\n
- \n
- \n
<\/p>\n
- \n
- \n
<\/p>\n
- $N = 100, R = W = 30 \\Rightarrow p_s = 1.88 \\times 10^-6$<\/ul>\n
\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u901a\u5e38\u4e0d\u4f1a\u4e3a\u6bcf\u4e2a\u952e\u521b\u5efa100\u4e2a\u526f\u672c\uff0c\u6240\u4ee5\u5e38\u7528\u7684\u662f $N=3, R=W=1$\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6709 $2\/3$ \u7684\u6982\u7387\u65e0\u6cd5\u8bfb\u53d6\u5230\u6700\u65b0\u7684\u6570\u636e\u3002\u53cd\u8fc7\u6765\u8bf4\uff0c\u6709 $1\/3$ \u7684\u6982\u7387\u53ef\u4ee5\u8bfb\u53d6\u5230\u6700\u65b0\u7684\u6570\u636e\u3002<\/p>\n
\u60a8\u662f\u5426\u5df2\u7ecf\u6ce8\u610f\u5230\u4e86\u5462\uff1f\u6700\u65b0\u7684\uff08\u7b2c\u4e00\u4ee3\u524d\uff09\u7684\u4e0d\u53ef\u8bfb\u7684\u6982\u7387\u4e3a2\/3\uff0c\u4f46\u5982\u679c\u6211\u4eec\u5c06\u5141\u8bb8\u770b\u5230\u524dk\u4ee3\u7684\u8bdd\uff0c\u90a3\u4e48\u5b8c\u5168\u4e0d\u80fd\u8bfb\u53d6\u524dk\u4ee3\u7684\u6982\u7387\u53ef\u4ee5\u7528Ps^k\u6765\u8ba1\u7b97\uff0c\u56e0\u6b64\uff0c\u6700\u7ec8\u9009\u62e9\u80fd\u591f\u770b\u5230k\u4ee3\u4ee5\u5185\u7684\u6982\u7387\u4f1a\u4e0d\u65ad\u589e\u52a0\u3002<\/p>\n
- \n
- \n
<\/p>\n
- \u66f8\u8fbc\u6642: $\\mathcal{W} = \\{ s \\in \\mathcal{S}| \\,|\\, |s| = W \\}$\u304b\u3089random\u306b\u9078\u629e (N replica\u304b\u3089random\u306b$W$\u500b\u9078\u3076)<\/ul>\n
\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u8003\u8651\u6ca1\u6709\u4efb\u4f55\u9650\u5236\u7684R\u548cW\u3002<\/p>\n
\u5728\u8fd9\u79cd\u8bbf\u95ee\u7b56\u7565\u7684\u57fa\u7840\u4e0a\uff0c\u5982\u4f55\u8ba1\u7b97\u5728\u8bfb\u53d6\u65f6\u6700\u65b0\u7248\u672c\u4e0d\u5305\u542b\u7684\u6982\u7387$p_s$\uff08\u5373\u4e0d\u65b0\u9c9c\u5ea6s\uff09\uff1f\u53ea\u9700\u8981\u8ba1\u7b97\u7528\u4e8e\u5199\u5165\u7684\u7279\u5b9a\u7684$W$\u4e2a\u8282\u70b9\u672a\u88ab\u9009\u4f5c\u8bfb\u53d6Quorum\u7684\u6982\u7387\u5373\u53ef\u3002<\/p>\n
$p_s = \\frac{\u76f4\u524d\u5199\u5165W\u8282\u70b9\u7684\u53d7\u8c03\u67e5\u603b\u4f53\u4e2d\u8bfb\u91cd\u8981\u6027\u8986\u76d6\u7684\u6570\u91cf}{|\\mathcal{R}|} = \\frac{N-W \\choose R}{N \\choose R}$<\/p>\n
$p_s = \\frac{\u76f4\u524d\u5199\u5165W\u8282\u70b9\u7684\u8c03\u67e5\u6bcd\u4f53\u4e2d\u6ee1\u8db3\u8bfb\u53d6Quorum\u7684\u6570\u91cf}{|\\mathcal{R}|} = \\frac{N-W \\choose R}{N \\choose R}$<\/p>\n
$p_s = \\frac{\u6839\u636e\u4e4b\u524d\u5199\u5165W\u8282\u70b9\u7684\u6240\u5c5e\u7fa4\u4f53\u5185\u7684\u8bfb\u53d6Quorum\u6570\u91cf}{|\\mathcal{R}|} = \\frac{N-W \\choose R}{N \\choose R}$<\/p>\n
(Note: The translation may vary depending on the specific context)<\/p>\n
\u5f53\u6211\u4eec\u901a\u8fc7\u4e00\u4e9b\u7ed9\u5b9a\u7684$N, W, R$\u6765\u7814\u7a76\u8fd9\u4e2a\u503c\u4f1a\u53d1\u73b0\u4e00\u4e9b\u6709\u8da3\u7684\u4e8b\u60c5\u3002<\/p>\n
- \n
- \n
<\/p>\n
- PBS $<k,t>$-staleness: \u78ba\u7387\u7684\u306b$t$\u6642\u9593\u4ee5\u964d\u306f$k$\u4e16\u4ee3\u4ee5\u5185\u304c\u8aad\u3081\u308b<\/ul>\n
\u662f\u7684\u3002<\/p>\n
Probabilistic Bounded Staleness\u53ef\u4ee5\u7ffb\u8bd1\u6210\u4e2d\u6587\u4e3a\u300c\u6982\u7387\u6027\u4fdd\u8bc1\u6570\u636e\u4e0d\u65b0\u9c9c\u300d\u3002<\/p>\n
\u5728\u5b9a\u4e49\u8fd9\u4e2aPBS\u65f6\uff0c\u6211\u4eec\u7684\u524d\u63d0\u5047\u8bbe\u662f\u4e0d\u662f\u4f7f\u7528\u4e00\u4e2a\u5171\u4eab\u7684\u8bfb\u5199quorum\u7cfb\u7edf\uff0c\u800c\u662f\u5206\u522b\u4e3a\u8bfbquorum\u548c\u5199quorum\u63d0\u4f9b\u4e0d\u540c\u7684\u6a21\u578b\u3002\u6b64\u5916\uff0c\u5728\u5b9a\u4e49\u53ef\u89c1\u6027\u65f6\uff0c\u6211\u4eec\u7684\u524d\u63d0\u662f\u5728\u5199\u5165\u64cd\u4f5c\u540e\u6267\u884c\u53cd\u71b5\u5904\u7406\u7684\u6269\u5c55quorum\u3002<\/p>\n
\u8ba9\u6211\u4eec\u6309\u987a\u5e8f\u6765\u770b\u4e00\u4e0b\u5b9a\u4e49\u548c\u6784\u5efa\u65b9\u6cd5\u3002<\/p>\n
PBS k-\u65b0\u9648\u4ee3\u8c22<\/h2>\n
k-\u65b0\u9c9c\u5ea6\u7684\u5b9a\u4e49\u5982\u4e0b\u3002<\/p>\n
\u5b9a\u4e49\u4ef2\u88c1\u7cfb\u7edf\u6ee1\u8db3PBS k-\u9648\u65e7\u4e00\u81f4\u6027\u7684\u6761\u4ef6\u662f\u6307\uff0c\u8bfb\u53d6\u4ef2\u88c1\u81f3\u5c11\u5305\u542b\u6709$1-p_{sk}$\u6982\u7387\u7684\u6570\u636e\uff0c\u8be5\u6570\u636e\u5728$k$\u4ee3\u4ee5\u5185\u3002<\/p>\n
\u6cd5\u5f8b\u6784\u6210<\/h3>\n
\u8003\u8651\u4e00\u79cd\u6240\u8c13\u7684Dynamo\u98ce\u683c\u7684\u8bfb\/\u5199Quorum\u7cfb\u7edf\u3002\u4f5c\u4e3a$\\mathcal{S}=2^V$\u4e0a\u7684\u8bbf\u95ee\u7b56\u7565\uff0c<\/p>\n
- \n
- \n
<\/p>\n
- \n
- \n
$\\omega$\u306fquorum systme\u4e0a\u306eaccess strategy<\/p>\n
\u6982\u7387\u4e0a\u6709\u8fb9\u754c\u7684\u9648\u65e7\u5ea6\uff08PBS\uff09<\/h1>\n
\u5728\u672c\u8bba\u6587\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e09\u79cd\u6982\u7387\u6709\u754c\u9648\u65e7\u5ea6\uff0c\u5373PBS k-\u9648\u65e7\u5ea6\u3001PBS t-\u53ef\u89c1\u5ea6\u548cPBS -\u9648\u65e7\u5ea6\u3002<\/p>\n
- \n
- \n
<\/p>\n
- Strong: \u8ab0\u304b\u304c\u66f8\u304d\u8fbc\u3093\u3060\u3089\u3001\u3069\u306e\u30d7\u30ed\u30bb\u30b9\u7d61\u307f\u3066\u3082\u5e38\u306b\u6700\u65b0\u306e\u5024\u304c\u898b\u3048\u308b(K=1, t=0\u306eBounded Staleness\u3068\u8a00\u3048\u308b)<\/ul>\n
\u6982\u5ff5\u672c\u8eab\u5e76\u4e0d\u662f\u65b0\u7684\u7ffb\u8bd1\u9009\u9879\u4e3a\u3002<\/h1>\n
\u770b\u5230\u8fd9\u4e2a\u6f14\u8bb2\u65f6\uff0c\u6211\u89c9\u5f97\u975e\u5e38\u65b0\u9c9c\u548c\u6709\u8da3\u3002\u4f46\u7a0d\u4f5c\u4e86\u89e3\u540e\uff0c\u9664\u4e86Bounded Staleness\u4ee5\u5916\uff0c\u5e76\u4e0d\u662f\u6240\u6709\u7684\u5b9a\u4e49\u90fd\u662f\u975e\u5e38\u65b0\u7684\u3002<\/p>\n
\u7ef4\u57fa\u767e\u79d1\uff1a\u5728\u67e5\u770b\u4e00\u81f4\u6027\u6a21\u578b\u65f6\uff0c\u8fd9\u4e9b\u4e00\u81f4\u6027\u7ea7\u522b\u662f\u57282007\u5e74\u7531Andrew Tanenbaum\u535a\u58eb\u63d0\u51fa\u7684\u3002<\/p>\n
2008\u5e74\uff0cAmazon.com\u7684\u9996\u5e2d\u6280\u672f\u5b98Werner Vogels\u5728\u4ed6\u7684\u6587\u7ae0\u300a\u6700\u7ec8\u4e00\u81f4\u6027 – \u91cd\u5ba1\u300b\u4e2d\u63d0\u5230\u4e86\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n
\u975e\u5e38\u6709\u8da3\u7684\u4e00\u79cd\u4e00\u81f4\u6027\u7ea7\u522b\uff0c\u540d\u4e3a\u6709\u754c\u9648\u65e7\u5ea6\u7684Bounded Staleness\u3002<\/h1>\n
\u73b0\u5728\uff0c\u7ec8\u4e8e\u5230\u4e86\u6b63\u9898\u3002Bounded Staleness \u53ef\u4e00\u81f4\u6027\u7ea7\u522b\u3002<\/p>\n
\u65e0\u8bba\u4ece\u54ea\u4e2a\u8fdb\u7a0b\u6765\u770b\uff0c\u7ecf\u8fc7t\u4e2a\u65f6\u95f4\u5355\u4f4d\u540e\uff0c\u53ef\u4ee5\u4fdd\u8bc1\u8bfb\u53d6\u7684\u503c\u662fK\u4ee3\u4ee5\u5185\u7684\u6570\u636e\u3002<\/p>\n
\u8fd9\u5c31\u662f\u6240\u8c13\u7684\u3002<\/p>\n
\u5982\u524d\u6240\u8ff0\uff0c\u5177\u6709\u6240\u8c13\u7684\u5f3a\u4e00\u81f4\u6027\uff08\u5728\u6b64\u6a21\u578b\u4e2d\u662f\u9488\u5bf9t=0\uff0ck=1\u7684\u60c5\u51b5\uff09\u7684\u590d\u5236\u54c1\u7684\u66f4\u65b0\u662f\u901a\u8fc7\u4f7f\u7528\u4ef2\u88c1\u7cfb\u7edf\u6765\u7ba1\u7406\u590d\u5236\u7684\u65b9\u6cd5\u6765\u4ecb\u7ecd\u7684\u3002<\/p>\n
\u5728\u8bfb\u53d6\u548c\u5199\u5165\u64cd\u4f5c\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u5171\u540c\u7684\u4ef2\u88c1\u7cfb\u7edf\u3002
\n\u5728\u5199\u5165\u65f6\u548c\u8bfb\u53d6\u65f6\uff0c\u4ece\u4e2d\u9009\u62e9\u4e00\u4e2a\u4ef2\u88c1\u7ec4\uff0c\u5e76\u5c06\u5199\u5165\/\u8bfb\u53d6\u64cd\u4f5c\u5e94\u7528\u4e8e\u5c5e\u4e8e\u8be5\u7ec4\u7684\u6240\u6709\u8282\u70b9\uff08\u5982\u679c\u6709\u4efb\u4f55\u4e00\u4e2a\u5931\u8d25\uff0c\u5219\u62a5\u9519\uff09\u3002<\/p><\/blockquote>\n\u5982\u679c\u8fd9\u6837\u505a\u7684\u8bdd\uff0c\u90a3\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n
\u4f60\u89c9\u4e0d\u89c9\u5f97”K\u4e16\u4ee3\u524d”\u6216\u8005”t\u65f6\u95f4\u8fc7\u540e”\u8fd9\u6837\u7684\u8868\u8fbe\u975e\u5e38\u6709\u8da3\u5462\uff1f<\/p>\n
\u5728\u6211\u4ee5\u524d\u7684\u7406\u89e3\u4e2d\uff0c\u53ea\u6709\u5728quorum\u76f8\u4e92\u91cd\u53e0\u7684\u60c5\u51b5\u4e0b\uff0c\u624d\u80fd\u79f0\u4e4b\u4e3aquorum\u3002\u5982\u679c\u8bfb\u53d6\u548c\u5199\u5165\u7684quorum\u6ca1\u6709\u91cd\u53e0\uff0c\u5c31\u4f1a\u5bfc\u81f4\u8bfb\u53d6\u5230\u65e7\u6570\u636e\uff0c\u6240\u4ee5\u6211\u4eec\u5fc5\u987b\u60f3\u529e\u6cd5\u8ba9\u8bfb\u53d6\u7684quorum\u5728\u67d0\u4e2a\u65f6\u523b\u4e0e\u6700\u65b0\u7684\u6570\u636e\uff08\u5373\u4f7f\u662fK\u4ee3\u4e4b\u524d\u7684\u6570\u636e\uff09\u7684\u5199\u5165quorum\u53d1\u751f\u51b2\u7a81\u3002\u9009\u62e9quorum\u7684\u65b9\u5f0f\u4e0d\u80fd\u662f\u968f\u673a\u7684\u3002<\/p>\n
\u4f8b\u5982\uff0c\u5c06N\u4e2a\u526f\u672c\u5206\u6210N\/k\u4e2a\u7ec4\uff0c\u5199\u5165\u65f6\u9009\u62e9N\/k\u4e2a\u526f\u672c\u8fdb\u884c\u8f6e\u8be2\u66f4\u65b0\uff0c\u8bfb\u53d6\u65f6\u4ece\u4efb\u610f\u4e00\u4e2a\u526f\u672c\u8bfb\u53d6\uff0c\u90a3\u4e48\u526f\u672c\u7684\u4e16\u4ee3\u786e\u5b9e\u53ea\u5b58\u5728k\u4e16\u4ee3\u4e4b\u524d\uff0c\u6240\u4ee5k\u4e16\u4ee3\u4e4b\u524d\u662f\u53ef\u4ee5\u4fdd\u8bc1\u7684\u3002\u4f46\u662f\uff0c\u5173\u4e8e$t$\u65f6\u95f4\u4e4b\u540e\u7684\u9650\u5236\uff0c\u6211\u6682\u65f6\u60f3\u4e0d\u5230\u3002<\/p>\n
\u4f46\u662f\uff0c\u5373\u4f7f\u5728\u67d0\u4e9b\u90e8\u5206\u7f3a\u5c11\u91cd\u53e0\u7684quorum\u7cfb\u7edf\u4e2d\uff0c\u53ea\u8981\u6309\u7167\u8fd9\u79cd\u65b9\u5f0f\u548c\u521b\u610f\u8fdb\u884c\u64cd\u4f5c\uff0c\u6216\u8bb8\u53ef\u4ee5\u8bbe\u8ba1\u51fa\u66f4\u597d\u7684write quorum\uff0c\u4ee5\u786e\u4fdd\u5728\u5168read quorum\u4e2d\u81f3\u5c11\u5b58\u5728\u4e00\u4e2a\u4e0d\u8d85\u8fc7K\u4ee3\u7684\u6570\u636e\u3002<\/p>\n
\u91cd\u8981\u7684\u8bba\u6587<\/h1>\n
\u8fd9\u4e2a\u7b54\u6848\u662f\u4eceAzure Cosmos DB\u7684\u5b98\u65b9\u6587\u6863\u4e2d\u5f15\u7528\u7684\u3002<\/p>\n
Peter Bailis, Shivaram Venkataraman, Michael J. Franklin, Joseph M. Hellerstein, Ion Stoica\u6240\u8457\u3002
\n\u300a\u5b9e\u7528\u504f\u597d\u968f\u673a\u4e00\u81f4\u6027\uff08PBS\uff09\u7528\u4e8e\u90e8\u5206\u6cd5\u5b9a\u4eba\u6570\u300b\u3002
\nhttp:\/\/vldb.org\/pvldb\/vol5\/p776_peterbailis_vldb2012.pdf<\/p>\n\u662f\u7684\u3002<\/p>\n
\u7528\u4e2d\u56fd\u8bed\u8a00\u8fdb\u884c\u518d\u8ff0\uff1a\u4ece\u8fd9\u91cc\u5f00\u59cb\uff0c\u5c06\u4ece\u8fd9\u7bc7\u8bba\u6587\u4e2d\u6458\u5f55\u4e00\u90e8\u5206\uff0c\u5e76\u5c3d\u53ef\u80fd\u5730\u7b80\u660e\u6613\u61c2\uff0c<\/p>\n
\u4f7f\u7528\u6982\u7387\u6027\u4ef2\u88c1\u7cfb\u7edf\u5b9e\u73b0Probabilistic Bounded Staleness\u7684\u65b9\u6cd5\u3002<\/p>\n
\u6211\u60f3\u8981\u5bf9…\u8fdb\u884c\u89e3\u8bf4\u3002<\/p>\n
Partial\/Probabilistic Quorum\u5373\u4e3a\u90e8\u5206\/\u6982\u7387\u6027\u6cd5\u5b9a\u4eba\u6570\u3002<\/h1>\n
\u5982\u4e0a\u6240\u8ff0\uff0c\u6b63\u5e38\u7684quorum\u7cfb\u7edf\uff08\u5728\u8fd9\u91cc\u6211\u4eec\u79f0\u4e4b\u4e3a\u4e25\u683cquorum\u7cfb\u7edf\uff0c\u4ee5\u4e0e\u6982\u7387\/\u90e8\u5206quorum\u7cfb\u7edf\u76f8\u5bf9\u6bd4\uff09\u7b26\u5408\u8be5\u5b9a\u4e49\u3002<\/p>\n
\u4ee5\u4e2d\u6587\u4e3a\u6bcd\u8bed\u7684\u9009\u9879\uff0c\u5c06\u4ee5\u4e0b\u5185\u5bb9\u8fdb\u884c\u91ca\u4e49\uff1a<\/p>\n
\u5c06\u96c6\u5408 V \u7684\u5b9a\u4e49\u4e3a\u8282\u70b9\u7684\u96c6\u5408\uff0c\u5373 $V = \\{ v_1, v_2, …, v_n \\}$\u3002Strict Quorum System \u662f\u6307\u96c6\u5408 $\\mathcal{S} \\subset 2^V$\uff0c\u5176\u4e2d $\\mathcal{S}$ \u662f V \u7684\u5b50\u96c6\u5408\uff0c\u5e76\u6ee1\u8db3\u4ee5\u4e0b\u6761\u4ef6\u3002$\\mathcal{S}$ \u7684\u5143\u7d20\u88ab\u79f0\u4e3a Quorum\u3002<\/p>\n
\u4efb\u610f\u4e24\u4e2a Quorum $Q_1$ \u548c $Q_2$ \u5fc5\u987b\u6709\u4ea4\u96c6($Q_1 \\cap Q_2 \\neq \\emptyset$)\u3002<\/p><\/blockquote>\n
\u7136\u800c\uff0c\u5982\u679c\u6211\u4eec\u5c1d\u8bd5\u653e\u5bbd\u8fd9\u4e2a\u4ea4\u53c9\u5224\u5b9a\u6807\u51c6\uff0c\u81ea\u7136\u800c\u7136\u5730\u53ef\u4ee5\u5b9a\u4e49\u51fa\u4e0b\u4e00\u4e2a\u90e8\u5206\u5173\u7167\u6982\u5ff5\u3002<\/p>\n
- Parial Quroum\u3067\u3042\u308b\u305f\u3081\u306e\u6761\u4ef6: \u5c11\u306a\u304f\u3068\u30822\u3064\u306eQuorum $Q_1, Q_2$\u304c\u5171\u901a\u90e8\u5206\u3092\u6301\u305f\u306a\u3044($Q_1 \\cap Q_2 = \\emptyset$)<\/ul>\n
\u4e3a\u4e86\u5b9e\u9645\u5e94\u7528\u800c\u8a00\uff0c\u5982\u679c\u5b8c\u5168\u4e0d\u91cd\u53e0\u4f1a\u9020\u6210\u56f0\u6270\uff0c\u800c\u4e14\u91cd\u53e0\u7684\u53ef\u80fd\u6027\u4e5f\u65e0\u6cd5\u8ba8\u8bba\uff0c\u56e0\u6b64\u5728\u90e8\u5206\u4ef2\u88c1\u7cfb\u7edf\u4e2d\u5f15\u5165\u4e86\u4e00\u79cd\u6240\u8c13\u7684”\u8bbf\u95ee\u7b56\u7565”\uff0c\u51b3\u5b9a\u54ea\u4e9b\u4ef2\u88c1\u4f1a\u88ab\u9009\u62e9\u4ee5\u53ca\u9009\u62e9\u7684\u6570\u91cf\u3002\u5728\u8fd9\u79cd\u8bbf\u95ee\u7b56\u7565\u4e0b\uff0c\u4e5f\u5b9a\u4e49\u4e86\u4e00\u79cd\u6982\u7387\u4ef2\u88c1\uff0c\u4ee5\u786e\u4fdd\u4ef2\u88c1\u4e4b\u95f4\u7684\u91cd\u53e0\u6982\u7387\u3002<\/p>\n
- \n
- \n
<\/p>\n
- \n
- \n
<\/p>\n
- \n
- \n
<\/p>\n
- \n
- \n
\u8aad\u307f\u8fbc\u3081\u308b\u30c7\u30fc\u30bf\u304c \u6700\u65b0\u3067\u3042\u308b\u4fdd\u8a3c\u306f\u306a\u3044<\/p>\n
\u8aad\u307f\u8fbc\u3080\u30d7\u30ed\u30bb\u30b9\u306b\u3088\u3063\u3066(\u540c\u4e00\u30d7\u30ed\u30bb\u30b9\u3067\u3042\u3063\u3066\u3082)\u306f \u5148\u7956\u8fd4\u308a\u3059\u308b\u304b\u3082\u3057\u308c\u306a\u3044<\/p>\n
\u3067\u3082\u3001\u3059\u3079\u3066\u306ereplica\u304c \u3044\u3064\u304b\u540c\u3058\u72b6\u614b\u306b\u53ce\u675f\u3059\u308b<\/p>\n
\u3053\u308c\u306f5\u3064\u306e\u5185\u4e00\u756a\u6574\u5408\u6027\u304c\u5f31\u3044\u304b\u308f\u308a\u306b\u8aad\u8fbc\u66f8\u8fbc\u304c\u3068\u3066\u3082\u901f\u3044<\/p>\n
Consistent Prefix<\/p>\n
\u8aad\u307f\u8fbc\u3081\u308b\u30c7\u30fc\u30bf\u304c\u6700\u65b0\u3067\u3042\u308b\u4fdd\u8a3c\u306f\u306a\u3044,\u5148\u7956\u8fd4\u308a\u3059\u308b\u304b\u3082\u3057\u308c\u306a\u3044, \u3044\u3064\u304b\u540c\u3058\u72b6\u614b\u306b\u53ce\u675f\u3059\u308b\u3000\u306e\u306fEventual\u3068\u540c\u3058<\/p>\n
\u305d\u308c\u306b\u52a0\u3048\u3066replica\u306b\u9069\u7528\u3055\u308c\u308b\u66f8\u8fbc\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u9806\u5e8f\u306f\u540c\u3058<\/p>\n
\u4f8b\u3048\u3070\u3001A, B, C\u3068\u3044\u3046\u66f8\u8fbc\u30ea\u30af\u30a8\u30b9\u30c8\u304c\u8907\u6570\u306ereplica\u306b\u9069\u7528\u3055\u308c\u308b\u3068\u3059\u308b\u3068\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u307f\u308b\u3068\u3001A, A,B, A,B,C\u3068\u66f8\u8fbc\u30ea\u30af\u30a8\u30b9\u30c8\u304c\u51e6\u7406\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306f\u8aad\u307f\u8fbc\u307e\u308c\u308b\u53ef\u80fd\u6027\u306f\u3042\u308b\u304c\u3001<\/p>\n
A,C\u3068\u304b\u3001B,A,C\u3068\u3044\u3046\u98a8\u306a\u9806\u3067\u66f8\u8fbc\u304c\u306a\u3055\u308c\u305f\u30c7\u30fc\u30bf\u304c\u898b\u3048\u308b\u53ef\u80fd\u6027\u306f\u306a\u3044<\/p>\n
Session<\/p>\n
Consistent Prefix\u306f\u3001\u5148\u7956\u8fd4\u308a\u304c\u8d77\u304d\u305f\u308a, \u8aad\u8fbc\u30ea\u30af\u30a8\u30b9\u30c8\u3054\u3068\u306b\u898b\u3048\u308b\u30c7\u30fc\u30bf\u306e\u4e16\u4ee3\u304c\u9055\u3046\u3001\u3053\u3068\u304c\u8d77\u304d\u308b\u3051\u308c\u3069\u3001
\nSession\u3067\u306f\u3001\u3044\u308f\u3086\u308bMonotonic Read, Monotonic Write, Read Your own Write(RYW)\u3092\u4fdd\u8a3c\u3059\u308b
\nMonotonic Read: \u3042\u308b\u30d7\u30ed\u30bb\u30b9\u304b\u3089\u898b\u3066\u8aad\u307f\u8fbc\u3081\u308b\u30c7\u30fc\u30bf\u306f\u5148\u7956\u8fd4\u308a\u3057\u306a\u3044<\/p>\nMonotonic Write: \u3042\u308b\u30d7\u30ed\u30bb\u30b9\u304b\u3089\u306a\u3055\u308c\u308b\u30c7\u30fc\u30bfX\u3078\u306e\u66f8\u8fbc\u9806\u5e8f\u306f\u4fdd\u5b58\u3055\u308c\u308b<\/p>\n
Read Your own Write(RYW): \u3042\u308b\u30d7\u30ed\u30bb\u30b9\u304c\u66f8\u8fbc\u51e6\u7406\u3092\u884c\u3063\u305f\u3089\u3001\u305d\u306e\u30d7\u30ed\u30bb\u30b9\u306f\u3059\u3050\u305d\u306e\u66f8\u8fbc\u51e6\u7406\u5b8c\u4e86\u5f8c\u306e\u30c7\u30fc\u30bf\u304c\u8aad\u3081\u308b<\/p>\n
Bounded Stalenss<\/p>\n
\u8aad\u307f\u8fbc\u3081\u308b\u30c7\u30fc\u30bf\u306f\u53e4\u3044\u3053\u3068\u306f\u3042\u308b\u304c\u3001t\u5358\u4f4d\u6642\u9593\u4ee5\u964d\u306fK\u4e16\u4ee3\u4ee5\u5185\u306e\u30c7\u30fc\u30bf\u304c\u8aad\u3081\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b
\n\u30e6\u30fc\u30b6\u306f\u3053\u306eK, t\u3092\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u3067\u304d\u308b\u3002
\n\u3053\u306e\u6574\u5408\u6027\u30ec\u30d9\u30eb\u306f\u3001\u5f37\u3044\u6574\u5408\u6027\u3092\u6c42\u3081\u305f\u3044\u3051\u3069\u30c7\u30fc\u30bf\u306eavailability\u304c99.99%\u3067\u3088\u304f\u3066\u3001\u304b\u3064\u4f4e\u30ec\u30a4\u30c6\u30f3\u30b7\u304c\u6b32\u3057\u3044\u5834\u5408\u306b\u6709\u52b9<\/p>\nStrong<\/p>\n
\u3044\u308f\u3086\u308bLinearizabile\u3092\u4fdd\u8a3c\u3059\u308b\u3001\u3042\u308b\u30d7\u30ed\u30bb\u30b9\u304c\u66f8\u304d\u8fbc\u3081\u305f\u3089\u3001\u3069\u306e\u30d7\u30ed\u30bb\u30b9\u304c\u8aad\u3093\u3067\u3082\u5e38\u306b\u6700\u65b0\u306e\u5024\u304c\u8aad\u3081\u308b\u3002
\nmajority quorum\u3067\u5b9f\u88c5\u3067\u304d\u308b<\/p>\n\u867d\u7136\u7a0d\u663e\u7c97\u9c81\uff0c\u4f46\u603b\u7ed3\u8d77\u6765\u5e94\u8be5\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
- \n
- \n
<\/p>\n
- Azure Cosmos DB Documentation(\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8)<\/ul>\n
\u8ba9\u6211\u4eec\u9996\u5148\u6765\u770b\u4e00\u4e0bAzure Cosmos DB\u6240\u652f\u6301\u7684\u4e94\u4e2a\u4e00\u81f4\u6027\u7ea7\u522b\u3002<\/p>\n
\u5728 Azure Cosmos DB \u4e2d\u5f15\u5165\u76845\u4e2a\u4e00\u81f4\u6027\u7ea7\u522b\u3002<\/h1>\n
\u6211\u4eec\u53ef\u4ee5\u53c2\u8003\u5b98\u65b9\u6587\u6863\u4e2d\u7684\u4e00\u8282\u6765\u4e86\u89e3\u4e94\u79cd\u4e00\u81f4\u6027\u7ea7\u522b\u3002<\/p>\n
![\"5](\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d92de913a08637a6e477a\/15-0.png\" "\\"\\"")
<\/div>\n\u4ece\u5de6\u8fb9\u8d70\uff0c\u6574\u4f53\u6027\u8d8a\u5f3a\uff0c\u4ece\u53f3\u8fb9\u8d70\uff0c\u6574\u4f53\u6027\u5c31\u8d8a\u5f31\u3002\u6211\u89c9\u5f97\u6bd4\u8d77\u5728\u8fd9\u91cc\u8be6\u7ec6\u89e3\u91ca”\u6574\u4f53\u6027”\uff0c\u66f4\u5bb9\u6613\u7406\u89e3\u7684\u65b9\u6cd5\u662f\u8fb9\u89e3\u91ca\u5404\u4e2a\u6574\u4f53\u6027\u6c34\u51c6\uff0c\u8fb9\u638c\u63e1\u611f\u89c9\u3002\u6211\u5c06\u7b80\u5355\u5730\u6309\u7167\u6574\u4f53\u6027\u8f83\u5f31\u7684\u987a\u5e8f\u8fdb\u884c\u89e3\u91ca\u3002<\/p>\n
\u5728\u9605\u8bfb\u4ee5\u4e0b\u5b8c\u6574\u6027\u7ea7\u522b\u65f6\uff0c\u6700\u597d\u5c06\u201c\u5982\u4f55\u7ba1\u7406\u591a\u4e2a\u6570\u636e\u526f\u672c\uff1f\u201d\u653e\u5728\u8111\u6d77\u4e2d\u4ee5\u4fbf\u4e8e\u7406\u89e3\u3002\u5728\u5206\u5e03\u5f0f\u6570\u636e\u5e93\u4e2d\uff0c\u4e3a\u4e86\u63d0\u9ad8\u53ef\u7528\u6027\u548c\u53ef\u6269\u5c55\u6027\uff0c\u4e0d\u53ef\u80fd\u53ea\u5c06\u6570\u636e\u5199\u5165\u4e00\u4e2a\u5730\u65b9\u3002\u56e0\u6b64\uff0c\u5fc5\u987b\u5728\u51e0\u4e2a\u4f4d\u7f6e\u4e0a\u4fdd\u7559\u6570\u636e\u7684\u526f\u672c\uff0c\u800c\u5982\u4f55\u7ba1\u7406\u8fd9\u4e9b\u526f\u672c\u7684\u65b9\u6cd5\u53d8\u5f97\u975e\u5e38\u91cd\u8981\u3002<\/p>\n
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<\/p>\n
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<\/p>\n
- \u3053\u306e\u4e0d\u601d\u8b70\u306a\u6027\u8cea\u3068\u69cb\u6210\u6cd5\u306f\u3001Quroum\u306e\u5fdc\u7528\u3068\u3057\u3066\u3068\u3066\u3082\u30b7\u30f3\u30d7\u30eb\u304b\u3064\u5b9f\u7528\u7684\u3060\u3068\u611f\u3058\u305f<\/ul>\n
\u8fd9\u662f\u4e3a\u4e86\u3002<\/p>\n
\u8bf7\u53c2\u8003\u4ee5\u4e0b\u5185\u5bb9\uff0c\u4e86\u89e3\u5176\u4ed6\u6709\u5173Cosmos DB\u7684\u4fe1\u606f\u3002<\/p>\n
- \n
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<\/p>\n
- \n
- \n
\u305d\u308c\u305e\u308c DocumentDB API, MongoDB API, Table API,Graph API(Gremlin\u5bfe\u5fdc)\u3068\u3044\u3063\u305fAPI\u3067\u30a2\u30af\u30bb\u30b9\u53ef\u80fd<\/p>\n
\u30da\u30bf\u30d0\u30a4\u30c8\u30ec\u30d9\u30eb\u307e\u3067\u30b9\u30b1\u30fc\u30eb\u53ef\u80fd
\n5\u3064\u306e\u4e00\u8cab\u6027\u30ec\u30d9\u30eb\u306b\u5bfe\u5fdc(Strong, Bounded Staleness, Session, Consistent Prefix, Eventual Consistency)<\/p>\n
\u6211\u6709\u3002<\/p>\n
\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u5173\u6ce8\u4e8eCosmos DB\u652f\u6301\u76845\u79cd\u4e00\u81f4\u6027\u7ea7\u522b\u4e2d\u7684\u4e00\u79cd\uff0c\u5373\u6709\u754c\u9648\u65e7\u5ea6\u3002\u6211\u4eec\u5c06\u91cd\u70b9\u4ecb\u7ecd\u8fd9\u4e2a\u6982\u5ff5\u63d0\u4f9b\u4e86\u4f55\u79cd\u4e00\u81f4\u6027\uff0c\u4ee5\u53ca\u5982\u4f55\u901a\u8fc7\u6982\u7387\u6027\u591a\u6570\u65b9\u5f0f\u5b9e\u73b0\u8be5\u4e00\u81f4\u6027\u7ea7\u522b\u3002<\/p>\n
\u4e3a\u4ec0\u4e48\u8981\u5173\u6ce8\u5176\u4e2d\u4e4b\u4e00\u5462\uff0c\u56e0\u4e3a\u6709\u4e24\u4e2a\u4e2a\u4eba\u539f\u56e0\u3002<\/p>\n
- \n