Github user jacksontj commented on the pull request: https://github.com/apache/trafficserver/pull/507#issuecomment-191318534 @zwoop hostdb persistance is important as a failback mechanism. We are in the progress of moving all of our load balancing to a dynamic dns service we wrote (and will be open sourcing soon-ish). Since we'll be relying on DNS responses so heavily, we have hostdb cache old responses and serve them stale for a time in the event that the DNS infrastructure has issues. As for hostdb issues, we're on 5.2.x and AFAIK we aren't seeing any issues. Are the issues you are seeing reproducible?
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