ElasticSearch 2.0 Transport Client - No Node Available exception

Question

[Using ElasticSearch version 2.0]

In etc/hosts file "esnode" is mapped to IP address(some other machine where ES is running) as shown

192.168.2.219 esnode

The Transport Client code is ::

public Client getClient() { 
    if ((this.client == null)) { 
        try { 
            Settings settings = Settings.settingsBuilder() 
                    .put("cluster.name", "myclustername").build(); 
            TransportClient tClient = TransportClient.builder().settings(settings).build(); 
            String[] nodes = "esnode:9300".split(COMMA); 
            for (String node : nodes) { 
                String[] hostPort = node.split(COLON); 

                tClient.addTransportAddress(new InetSocketTransportAddress( 
                        InetAddress.getByName(hostPort[0]), Integer.parseInt(hostPort[1]))); 
            } 
            this.client = tClient; 

        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
    } 
    return this.client; 
} 

This client code runs but when executing the below code : this.getClient().prepareGet(indexName, typeName, String.valueOf(id)).get();

The exception is thrown:

NoNodeAvailableException[None of the configured nodes are available: []] 
        at org.elasticsearch.client.transport.TransportClientNodesService.ensureNodesAreAvailable(TransportClientNodesService.java:280) 
        at org.elasticsearch.client.transport.TransportClientNodesService.execute(TransportClientNodesService.java:197) 
        at org.elasticsearch.client.transport.support.TransportProxyClient.execute(TransportProxyClient.java:55) 
        at org.elasticsearch.client.transport.TransportClient.doExecute(TransportClient.java:272) 
        at org.elasticsearch.client.support.AbstractClient.execute(AbstractClient.java:347) 
        at org.elasticsearch.action.ActionRequestBuilder.execute(ActionRequestBuilder.java:85) 
        at org.elasticsearch.action.ActionRequestBuilder.execute(ActionRequestBuilder.java:59) 
        at org.elasticsearch.action.ActionRequestBuilder.get(ActionRequestBuilder.java:67) 

I have also tried using IPAddress instead of host name. The above code runs properly if

esnode is mapped to 127.0.0.1

Can somebody help...

Answer 1

Setup elasticsearch host ip address to network.host value in elasticsearch.yml

network.host: es_host_ip

This is solve TransportClient NoNodeAvailableException issue.

Answer 2

Check if your elasticsearch server have also version 2.0, if no, upgrade. Client and server must have the same version to work, I don't know why but this solved my problem.

Cheers,

Answer 3

Other reason could be, your Elasticsearch Java client is a different version from your Elasticsearch server .

Elasticsearch Java client version is nothing but your elasticsearch jar version in your code base.

For example: In my code it's elasticsearch-2.4.0.jar

To verify Elasticsearch server version,

$ /Users/kkolipaka/elasticsearch/bin/elasticsearch -version Version: 5.2.2, Build: f9d9b74/2017-02-24T17:26:45.835Z, JVM: 1.8.0_111

As you can see, I've downloaded latest version of Elastic server 5.2.2 but forgot to update the ES Java API client version 2.4.0 https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/client.html