Allow interval-based rotation for round robin entries
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Key: TS-918
URL: https://issues.apache.org/jira/browse/TS-918
Project: Traffic Server
Issue Type: New Feature
Components: DNS
Reporter: M. Nunberg
Attachments: timed_round_robin.patch
This patch allows trafficserver to rotate round-robin DNS entries based on
interval rather than frequency.
This is beneficial for HTTP keepalive when there are a small amount of client
requests scaled over multiple clients.
Thus, for e.g. google which tends to return 4-5 RR/SA entries, the normal
behavior would be to open 5 TCP connections to google if five clients requested
five objects (or even if a single client requested 5 objects, if strict round
robin is enabled).
This patch would help in such situations by making round robin rotation based
on an absolute interval, so requests are forwarded to a single TCP connection
for each interval. After the interval expires, the DNS RR entry is rotated.
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