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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-3373) TTL & identity aware read cache for the SRV records
Date Thu, 19 Mar 2015 02:56:38 GMT
Gopal V created YARN-3373:

             Summary: TTL & identity aware read cache for the SRV records
                 Key: YARN-3373
                 URL: https://issues.apache.org/jira/browse/YARN-3373
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: yarn
            Reporter: Gopal V

The freshness/staleness checks of the SRV record should be an abstracted implementation detail
of the service registry.

This implies that every client is asked to listServiceRecords each time they require a list
of the records, which would be incredibly expensive if it involved network round-trips during
normal tight-loop operations.

The combination of unique binding records and the TTL provides the equivalent of the DNS (fixed
CNAME -> unique A) roll-over mechanisms used to cache-bust effectively on the client-side.

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