How to disable connection pooling in Gremlin server

Question

I am using gremlin server with hbase as storage.bakend.

When I try to connect to the gremlin server from my spark code,the below message gets logged and after sometime it timeouts.

Opening connection pool on Host{address = 'ip:8182' ,, hostUri=ws:/ip:8182/gremlin} with core size of 2

The following code is used to get the client instance for each partition:

private static Cluster cluster;
private static Client client;
Logger logger = LoggerFactory.getLogger(GremlinSeverConnection.class);

public Client getGraph(GraphConf conf) {

 if (client == null) {
    try {
        // cluster = Cluster.build(new File(conf)).create();
        cluster = Cluster.build(conf.getGraphHost()).port(Integer.parseInt(conf.getGraphPort()))
                .serializer(getserializer(conf.getGraphSerializer())).create();


        client = cluster.connect();

        logger.info("connected to graph database");
    } finally {

        //cluster.close();
        //client.close();
    }
}
    return client;
}

public Serializers getserializer(String serializer) {

    return Serializers.GRAPHSON;
}

Answer 1

You could set the min and max size of the connection pool to 1:

Cluster cluster = Cluster.build().maxConnectionPoolSize(1)
                                  minConnectionPoolSize(1).create();

That should force the client to use a single connection.