Vinod Kumar Vavilapalli created YARN-4757:
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Summary: [Umbrella] Simplified discovery of services via DNS
mechanisms
Key: YARN-4757
URL: https://issues.apache.org/jira/browse/YARN-4757
Project: Hadoop YARN
Issue Type: New Feature
Reporter: Vinod Kumar Vavilapalli
[See overview doc at YARN-4692, copying the sub-section (3.2.10.2) to track all
related efforts.]
In addition to completing the present story of service-registry (YARN-913), we
also need to simplify the access to the registry entries. The existing read
mechanisms of the YARN Service Registry are currently limited to a registry
specific (java) API and a REST interface. In practice, this makes it very
difficult for wiring up existing clients and services. For e.g, dynamic
configuration of dependent endpoints of a service is not easy to implement
using the present registry-read mechanisms, *without* code-changes to existing
services.
A good solution to this is to expose the registry information through a more
generic and widely used discovery mechanism: DNS. Service Discovery via DNS
uses the well-known DNS interfaces to browse the network for services.
YARN-913 in fact talked about such a DNS based mechanism but left it as a
future task. (Task) Having the registry information exposed via DNS simplifies
the life of services.
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