cluster grouping function

clustered exception option

clustered call result merge function

Positional factory function for class slacker.client.cluster.ClusterEnabledSlackerClient.

create a cluster enalbed slacker client options:

• zk-root: specify the root path in zookeeper
• factory: a client factory, default to non-ssl implementation
• grouping: specify how the client select servers to call, this allows one or more servers to be called. Possible values:
  • :first always choose the first server available
  • :random choose a server by random (default)
  • :leader use current leader server
  • :least-in-flight use server with least pending requests
  • :weighted randomly select a server using :weight from server data as weight
  • :all call function on all servers
  • (fn [ns fname params slacker-client servers]) specify a function to choose. You can also return :random or :all in this function
• grouping-results: when you call functions on multiple server, you can specify how many results return for the call. Note that if you use :vector or :map, you will break default behavior of the function. Possible values:
  • :nil always returns nil
  • :single returns only one value
  • :vector returns values from all servers as a vector
  • :map returns values from all servers as a map, server host:port as key
  • (fn [ns fname params]) a function that returns keywords above
• grouping-exceptions: how to deal with the exceptions when calling functions on multiple instance.
  • :all the API throws exception when exception is thrown on every instance
  • :any the API throws exception when any instance throws exception
  • (fn [valid-result error-results]) a function to decide what exception to throw or never
• server-data-change-handler: a function accepts the client object, server address and server data. Note that this function runs on event thread so never do blocking things within it.

cluster enabled defn-remote, with cluster options supported.

cluster enabled use-remote