1. 簡介
在大區塊的背景下，資料將越來越大，很多人對應對大區塊還是有很多疑問，基于此我們設計實作了ShowMANDB資料分布式存盤來應對大資料時代，
事實上將來資料量變得足夠大的時候，遠端單點資料獲取和處理將變得困難，龐大的資料量導致業務處理會變得越來越慢，分布式儲存和處理變得越來越有必要，今天我們就介紹一下基于MetaID的分布式儲存方案，ShowMANDB，AppMANDB和LocalMANDB，
2. ShowMANDB
ShowMAN是ShowPay MetaID Accessing & Networking，目的是方便第三方開發者快速開展基于MetaID的開發同時也是分布式資料節點，
ShowMANDB 存盤的本質上是MetaID的Tx集合，并且對外提供聚合服務，
ShowMANDB 提供了MetaID的基本服務，應用可以通過ShowMANDB很方便的獲取到用戶的MetaID用戶資訊，Protocols節點資訊等基本的MetaID服務，同時我們也提供了Metanet的基本請求介面，包括metanet tree的獲取，父節點/子節點，已經metanet node資訊等，
應用可以通過ShowMANDB很方便的獲取資料，同時配合MetaIDjs/ShowAppjs，完成MetaID的讀寫，從而可以將精力放在應用業務上，更容易產出更優質的應用，
3. AppMANDB 和 LocalMANDB
首先AppMANDB和LocalMANDB在資料存盤和預置的介面上是大致一樣的，他們在資料篩選上有所區別，
我們注意到如同ShowMANDB在Metanet資料中只過濾存盤了MetaID的資料，對應大部分應用來說，也只需要專注自己感興趣的資料，并且存盤和處理就完全足夠了，一方面資料存盤將變少，操作效率也將變快，于是我們在ShowMANDB的基礎上分離出來AppMAN，將來開源之后用戶將很方便的構建AppMANDB，甚至在這個基礎上處理自己的資料，
同樣對于用戶來說，無論是將來點對點，或者離線處理需要，資料也可以存盤在用戶設備本地，以后新的拓展也方便，比如在ShowApp上我們也集成了輕量級的LocalMANDB，
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BSV-Data
ShowMANDB
ShowMANDB2
APPMANDB1
APPMANDB2
User1
LocalManDB1
User3
User4
User2
LocalManDB2
User6
User7
User8
User5
APPMANDB3
3.1 AppMANDB
AppMANDB 可以配置從ShowMANDB上獲取資料，通過訂閱模式從ShowMANDB上獲取自己感興趣的資料，應用可以構建只包含自己資料集的APPMANDB，從showmandb中訂閱獲取屬于自己的tx集合再進行資料分析和處理，可以拓展showmandb資料介面方便賦予自己應用更多的功能，同時也從showmandb同步獲取原始資料，showmandb服務資料，
appmandb localmandb都將提供基礎的和showmandb一樣介面服務，同時也提供了資料存盤結構，應用方/用戶可以很方便的基于資料構建屬于自己的附加資料服務，提供的介面包括：
1.獲取metaid基礎資訊getMetaIDInfo
2.獲取節點資訊getNode
3.獲取MetaID節點parts資訊
4.獲取根節點
5.獲取子節點
6.獲取節點樹
7.根據address獲取節點
等，
比如Showbuzz AppMANDB 訂閱了showbuzz協議metanote協議，
這樣Showbuzz 只需要從showbuzz-AppMANDB上獲取資料，一方面減少ShowMANDB服務的負載，另一方面也將大大加快資料獲取速度，也可以在這個基礎上添加自己需要的功能，比如Tag資料賽選等，
3.2 LocalMANDB
應用客戶端（web or phone）進一步將屬于資料變小存盤在自己設備中，資料獲取和處理速度進一步變快，為以后的點對點通道提供資料基礎，
這樣的ChainData -> ShowMANDB -> AppMANDB -> localMANDB 資料層層分布式存盤，不僅在所有權上用戶自己擁有自己資料，也可以花最小代價自己存盤資料，事實上我們在設計這個模型的時候已經在產品中使用了，目前Show APP中已經初步完成了localmandb的雛形， metaidjs 中我們也存盤了用戶資訊等基本資訊，后續會將protocalsdata也存盤，進一步優化用戶使用體驗，
這樣最終ShowMANDB 擁有MetaID所有資料，AppMANDB儲存應用相關的資料，LocalMANDB儲存用戶自己的資料，資料分布式存盤，可以保證業務在大資料時候正常運行，這樣設計也讓應用和用戶的MetaID資料不單獨依賴任何服務方，保證資料在全球范圍是真正分布式存盤，
目前ShowMANDB已經對外提供服務，可以通過API-query直接查詢，LocalMANDB和AppMANDB已經在Show等應用中實踐測驗，這兩個程式我們開發工程師正在加緊優化，爭取早日開源，
