GOCDB/Release4/Development/MultipleEndpointsPerService

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Multiple Endpoints

Introduction

Define multiple Endpoints per Service.

• RT: https://rt.egi.eu/rt/Ticket/Display.html?id=3347
• GGUS: https://ggus.eu/ws/ticket_info.php?ticket=93966

GOCDB needs to be extended so that it can store multiple endpoints per service for the following use cases:

• Adding multiple GRIS endpoint URLs per service. This will allow the Top-BDII to directly retrieve information about the endpoint.
• Separating tape and disk endpoints in an SRM service. This will allow selected endpoints of a service to be put into downtime.

To achieve this we propose adding support for multiple <Endpoint> elements per service (the Endpoint element in turn wraps a <URL>). For example, one Endpoint could define the actual service URL, a second could define the GRIS ldap URL, whilst a third could define an admin portal URL and so on.

Given that a Service would be able to define multiple endpoints, a mechanism is required to distinguish different endpoint types and their intended purpose. To do this, we propose adopting the GLUE2 InterfaceName value:

• As per GLUE2, Define a new <InterfaceName> tag as a child of <Endpoint>. For example, the Endpoint could define the service's GRIS ldap URL with a <InterfaceName> value of "RIS" (or maybe "ldap.RIS") representing an ldap endpoint to a Resource Information Service.

Adding multiple Endpoints per service is a more GLUE2 centric approach. Additional elements/attributes can be added to the GOCDB Endpoint if required.

Implementation

When adding or editing a service we propose that a user can add multiple child Endpoint objects.

The GOCDB-PI output will be extended for nesting multiple child <Enpoint> elements within a parent <SERVICE_ENDPOINT>. Each <Endpoint> nests the child <URL> and an <InterfaceName>. Using this mechanism the Top-BDII can retrieve a filtered list of endpoints that support a URL with the requied interface (e.g. "RIS" or maybe even "ldap.RIS" to indicate the URL protocol scheme).

GOCDB would centrally manage an enumeration of <InterfaceName>s. Each type of InterfaceName would be documented similar to service types. Endpoint URLs that nest a particular InterfaceName MUST fully support that particular interface type (which is the intended purpose of a standard interface).

PI Examples

Query String: https://goc.egi.eu/gocdbpi/private/?method=get_service_endpoint&InterfaceName=RIS

This query would return all <SERVICE_ENDPOINT> elements that support a RIS <ENDPOINT> (note, muliple <ENDPOINT> elements can still be nested in each <SERVICE_ENDPOINT>).

 <?xml version="1.0" encoding="UTF-8"?>
 <results>
   <SERVICE_ENDPOINT PRIMARY_KEY="50257G0">
      <PRIMARY_KEY>50257G0</PRIMARY_KEY>
      <HOSTNAME>dgiref-globus.fzk.de</HOSTNAME>
      <GOCDB_PORTAL_URL>https://goc.egi.eu/portal/index.php?Page_Type=View_Object&amp;object_id=77182&amp;grid_id=0</GOCDB_PORTAL_URL>
      <HOST_OS>SL5</HOST_OS>
      <BETA>N</BETA>
      <SERVICE_TYPE>GRAM5</SERVICE_TYPE>
      <CORE></CORE>
      <IN_PRODUCTION>Y</IN_PRODUCTION>
      <NODE_MONITORED>Y</NODE_MONITORED>
      <SITENAME>DGIREF</SITENAME>
      <COUNTRY_NAME>Germany</COUNTRY_NAME>
      <COUNTRY_CODE>DE</COUNTRY_CODE>
      <ROC_NAME>NGI_DE</ROC_NAME>
      <ENDPOINT>
         <URL>ldap://ce-cms.vinca.rs:2170/mds-vo-name=AEGIS10-VINCA-CMS,o=grid</URL>
         <InterfaceName>RIS</InterfaceName>
      </ENDPOINT>   
 
      <!-- More Endpoints not shown -->
      ...
 </SERVICE_ENDPOINT>

 </results>

Status Oct 2013

• Some future provisioning was included in the GOCDBv5 database schema so that a service can define multiple endpoints as described at https://wiki.egi.eu/wiki/GOCDB/v5. However, to enable this feature requires further work in the web portal and PI which currently restricts a service to a single endpoint.
• Furthermore, tools such as SAM and Ops portal would also need to support multiple endpoints, i.e. for monitoring and downtime notification (an implementation in GOCDB alone wouldn’t be much use).
• We have received a mail from Marian Babik (Wed 09/05/2012 17:09) explaining that SAM needs time to develop support for multiple endpoints before this can be introduced in GOCDB. SAM have asked us to hold off on implementing multiple endpoints until they have a development plan and proposal for how to resolve their issues.