Package org.elasticsearch.client

Interface NodeSelector

All Known Implementing Classes:
HasAttributeNodeSelector, PreferHasAttributeNodeSelector
public interface NodeSelector
Selects nodes that can receive requests. Used to keep requests away from master nodes or to send them to nodes with a particular attribute. Use with RestClientBuilder.setNodeSelector(NodeSelector).

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static NodeSelector
    ANY
    Selector that matches any node.
    static NodeSelector
    SKIP_DEDICATED_MASTERS
    Selector that matches any node that has metadata and doesn't have the master role OR it has the data data role.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    select​(Iterable<Node> nodes)
    Select the Nodes to which to send requests.

  • Field Details

    • ANY

      static final NodeSelector ANY
      Selector that matches any node.

    • SKIP_DEDICATED_MASTERS

      static final NodeSelector SKIP_DEDICATED_MASTERS
      Selector that matches any node that has metadata and doesn't have the master role OR it has the data data role.

  • Method Details

    • select

      void select​(Iterable<Node> nodes)
      Select the Nodes to which to send requests. This is called with a mutable Iterable of Nodes in the order that the rest client would prefer to use them and implementers should remove nodes from the that should not receive the request. Implementers may iterate the nodes as many times as they need.

      This may be called twice per request: first for "living" nodes that have not been blacklisted by previous errors. If the selector removes all nodes from the list or if there aren't any living nodes then the RestClient will call this method with a list of "dead" nodes.

      Implementers should not rely on the ordering of the nodes.