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https://issues.apache.org/jira/browse/TS-918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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M. Nunberg updated TS-918:
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Attachment: timed_round_robin.patch
> Allow interval-based rotation for round robin entries
> -----------------------------------------------------
>
> 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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