Jaeger exporter keeps program open indefinitely

[dyladan]

Please answer these questions before submitting a bug report.

What version of OpenTelemetry are you using?

0.3.2

What version of Node are you using?

12, 10, 8

What did you do?

If possible, provide a recipe for reproducing the error.

const opentelemetry = require('../../packages/opentelemetry-core');
const { NodeTracerRegistry } = require('../../packages/opentelemetry-node');
const { SimpleSpanProcessor } = require('../../packages/opentelemetry-tracing');
const { JaegerExporter } = require('../../packages/opentelemetry-exporter-jaeger');

const registry = new NodeTracerRegistry({
    plugins: {
        ioredis: {
            enabled: true,
            path: path.join(__dirname, "../../packages/opentelemetry-plugin-ioredis"),
        }
    }
});

registry.addSpanProcessor(new SimpleSpanProcessor(new JaegerExporter({
    serviceName: 'ioredis-example',
})));

// Initialize the OpenTelemetry APIs to use the BasicTracerRegistry bindings
opentelemetry.initGlobalTracerRegistry(registry);

const Redis = require("ioredis");
const redis = new Redis();

async function main() {
    await redis.set("foo", "bar");
	await redis.quit();
}

main()

What did you expect to see?

Program exits after redis command

What did you see instead?

Program continues to run

Additional context

Jaeger client uses a UDP socket to communicate with Jaeger. After one span is sent, it appears this connection stays open for an undefined length of time. Unref'ing the socket solves the problem.