[tcapulusdb knowledge base] tcapulusdb shard relocation introduction

1. Function entry ：

   

2. Tcaplus The following three processes support equipment relocation transactions

   1. Storage device relocation : because Tcapsvr The master and slave machines are used in pairs , Therefore, the equipment relocation will replace the original one master and one slave with a new one on the shelf （ Or free ） One master and one slave machine , It is essentially all the data on the storage node Shard Initiate data relocation with the same goal , be chiefly used in Slave Failure and unable to do Slave The reconstructed scene （ Single point Master）

   2. 

   3. Access equipment relocation ： First, find out how many... Are on the source access machine Proxy process , Which service areas are served , Then install the same amount of... On the new machine Proxy Process and suggest access mapping relationship , Finally, recycle the... On the source machine Proxy process

   4. 

   5. Tcapdb Equipment relocation

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3. The following is an introduction by process type

   1. The storage device ：

      1. The list shows Master Information about , Find someone ready for equipment relocation Master, Click on “ Move “ Button

      2. After the page Jump , First click on “ Manual ”, OMS It will automatically screen out those suitable for relocation Tcapsvr Provide the user to select the target end , The goal is Tcapsvr The available storage units must be greater than or equal to the storage nodes to be relocated Shard Count

      3. 

      4. The relocation method is the same as “ Storage tier expansion and contraction ” section , Divided into default “ Detrimental to relocation ” and “ Lossless relocation ”, For a detailed introduction, see the previous article , If it is currently （ Single point Master,Slave fault ）, You can't use... Here “ Lossless relocation ”, And the bottom recycling mode should be selected “Slave Machine stop mode ”

      5. 

      6. Finally, click “ Move ” Generate relocation transaction , Wait for the transaction to complete

   2. Access equipment

      1. Find the... To be relocated from the list display Proxy equipment IP, Click on “ Move ” Button

      2. According to... On the equipment to be relocated Proxy Number of processes , Select the target end for relocation from the existing machine or the new machine , Select and click “ Move ”

   3. Tcapdb equipment , The operation is the same as that of access equipment

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TcaplusDB It's a distributed product of Tencent NoSQL database , The code for storage and scheduling is completely self-developed . With cache + Landing fusion architecture 、PB Levels of storage 、 Millisecond delay 、 Lossless horizontal expansion and complex data structure . At the same time, it has rich ecological environment 、 Easy migration 、 Extremely low operation and maintenance costs and five nine high availability features . Customer coverage game 、 Internet 、 government affairs 、 Finance 、 Manufacturing and the Internet of things .