Rediscluster setup and capacity expansion

https://blog.csdn.net/chuanchengdabing/article/details/109226115

In the case of the Internet , Or ECs ：
Open cluster port , also Every port +10000 The port of should also be open
After opening , Modify the... Of each node nodes.conf Put the intranet IP Change to extranet IP

16384 Slots
(1) If the slot is 65536, Send heartbeat message header to 8k, The heartbeat packet sent is too large .
As mentioned above , In the header , What takes up the most space is myslots[CLUSTER_SLOTS/8].
When the slot is 65536 when , The size of this piece is :
65536÷8÷1024=8kb
Because every second ,redis The node needs to send a certain number of ping Messages as heartbeat packets , If the slot is 65536, This ping The message header is too big , Waste bandwidth .
(2)redis The number of cluster primary nodes of cannot exceed 1000 individual .
As mentioned above , More cluster nodes , The more data the heartbeat packet carries in its message body . If the node passes 1000 individual , It can also lead to network congestion . therefore redis author , Don't suggest redis cluster The number of nodes exceeds 1000 individual .
that , For the number of nodes in 1000 Inside redis cluster colony ,16384 There are enough slots . There is no need to expand to 65536 individual .