ElasticSearch(一) Transport Client

Transport  Client 通过远程连接到Es 集群，他不加入集群，只是通过集群nodes 的 transportAddress 和集群通信。

一  如何通过集群域名获得集群nodes的transportAddress

http://xxx.com/_cat/nodes?h=ip,port

http://xxx.com/_nodes/transport

二 TransportClient 初始化方式

// on startup

TransportClient client = new PreBuiltTransportClient(Settings.EMPTY)
        .addTransportAddress(new TransportAddress(InetAddress.getByName("host1"), 9300)) //9300 为nodes 默认的端口，请使用实际 端口号
        .addTransportAddress(new TransportAddress(InetAddress.getByName("host2"), 9300));

// on shutdown

client.close();

三 TransportClient 动态加入node

Settings settings = Settings.builder()
        .put("client.transport.sniff", true)   //嗅探 默认每5s去更新下集群新的节点，加入新节点，去掉坏节点
        .put("cluster.name", "myClusterName")  //集群名称
        .build();

 TransportClient client = new PreBuiltTransportClient(settings);

四 Settings 其他参数

可通过设置 client.transport.nodes_sampler_interval 来改变轮询集群节点连接的频率。

Parameter	Description
client.transport.ignore_cluster_name	Set to true to ignore cluster name validation of connected nodes. (since 0.19.4)
client.transport.ping_timeout	The time to wait for a ping response from a node. Defaults to 5s.
client.transport.nodes_sampler_interval	How often to sample / ping the nodes listed and connected. Defaults to 5s.

官方文档：https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/transport-client.html