Cluster addslots establish a cluster

1. cluster addslots Build clusters
   1. data structure
   2. Command to use
   3. summary
   4. ️ Thank you for your

cluster addslots Build clusters

redis There are 16384 Slot bits , Use CLUSTER MEET The command did not allocate time slot bits when building the cluster . You can send CLUSTER ADDSLOTS The command assigns the time slot bit to the current node cluster node slots Property is used to record which slot the node is responsible for .

data structure

slots It's a binary digit group , If the binary value of the array index is 1, Indicates that the current node is responsible for this slot , Otherwise, you are not responsible for the slot . numslots Attribute the number of slots that the storage node is responsible for , These two attributes record the slot location of the current node , The current node sends messages to other nodes in the cluster . received slots The node of the array saves the array information in the corresponding node clusterNode In structure .

Besides ,clusterState Structural slots The array also holds the allocation of slots . slots Array has 16384 Elements , The pointer to the element is null , Indicates that no slot bits are allocated , The pointer to a cluster node structure indicates the node assigned to the slot .

Why is the slot allocation information saved in the cluster node slots Array , It is also saved in the cluster state slots Array ？

Since the cluster node records the allocation of slots , But there is no record of which node the slot is assigned to , So please traverse the state of the cluster nodes Cluster node structure of dictionary , see slots Array

Command to use

CLUSTER ADDSLOTS Command to complete the command to assign the slot to the node , Change the status of the cluster slots The index of the slot in the array points to the current node clusterNode structure , And specify the name of the cluster node slots Array
redis It is through CLUSTER ADDSLOTS Command to complete slot allocation

> CLUSTER ADDSLOTS 1 2 3OK

This is through CLUSTER ADDSLOTS Command to allocate slots , take 1 2 3 Three slots are allocated to the server that receives this command .

When the slot is divided and then allocated, an error will be reported , Like the command above , If the execution is successful, another execution will result in an error .

summary

Okay , today cluster addslots The command is written and analyzed here , If something is wrong, please give me more advice .

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