What is the core interface of Ribbon Loadbalance
What is the core interface of Ribbon Loadbalance, many novices are not very clear about this. In order to help you solve this problem, the following editor will explain it in detail. People with this need can come and learn. I hope you can get something.
Ribbon Loadbalance Core Interface list
IRule
ILoadBalancer
ServerList
ServerListFilter
IPing
Function introduction
Configuration Portal: RibbonClientConfiguration
Select the right node in the right way
ILoadBalancer
API definition: com.netflix.loadbalancer.ILoadBalancer
Core method:
/ * Choose a server from load balancer. * * @ param key An object that the load balancer may use to determine which server to return. Null if * the load balancer does not use this parameter. * @ return server chosen * / public Server chooseServer (Object key); / * * @ return Only the servers that are up and reachable. * / public List getReachableServers (); / * * @ return All known servers, both reachable and unreachable. * / public List getAllServers ()
Core role: maintain full service list and available list, rely on IPing interface to mark failure nodes, identify failure depends on IPing implementation
Default implementation: ZoneAwareLoadBalancer
IRule
API definition: com.netflix.loadbalancer.IRule
Core method:
/ * choose one alive server from lb.allServers or * lb.upServers according to key * * @ return choosen Server object. NULL is returned if none * server is available * / public Server choose (Object key)
Core role: select a server; from loadbalance to provide multiple selection strategies
Default implementation: ZoneAvoidanceRule
ServerList
API definition: com.netflix.loadbalancer.ServerList
Core method:
/ * Return updated list of servers. This is called say every 30 secs * (configurable) by the Loadbalancer's Ping cycle * * / public List getUpdatedListOfServers ()
Core role: get the list of update services
Default implementation: ConfigurationBasedServerList
ServerListFilter
API definition: com.netflix.loadbalancer.ServerListFilter
Core method:
Public List getFilteredListOfServers (List servers)
Core role:
Default implementation: ZonePreferenceServerListFilter
IPing
API definition: com.netflix.loadbalancer.IPing
Core method:
/ * * Checks whether the given Server is "alive" i.e. Should be * considered a candidate while loadbalancing * * / public boolean isAlive (Server server)
Core role: check whether a specific service is alive or not, and do failure service detection in ILoadBalance
Default implementation: DummyPing
Extended thinking
The biggest point of Ribbon is that it allows users to customize various rules, manages node state and access rules well, and makes some useful products based on rule extension, such as grayscale management and weight control under unequal capabilities of target nodes.
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