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https://issues.apache.org/jira/browse/TS-3418?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15044213#comment-15044213
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ASF GitHub Bot commented on TS-3418:
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Github user jpeach commented on the pull request:
https://github.com/apache/trafficserver/pull/359#issuecomment-162380212
Hi John. First, let's clean up the commit history on this branch.
- please squash the "clang format" and "updated comments" commits into
their respective previous commits.
- for each commit, the subject should be a short description like TS-3418:
what this commit does"
- for each commit, add a longer description in the commit message for
future generations. What are all the changes in this commit? Why are they
necessary? Try to include enough description for someone to understand what is
going on in the commit.
> Second hash ring for consistently hashed parent selection
> ----------------------------------------------------------
>
> Key: TS-3418
> URL: https://issues.apache.org/jira/browse/TS-3418
> Project: Traffic Server
> Issue Type: New Feature
> Components: Parent Proxy
> Reporter: Leif Hedstrom
> Assignee: John Rushford
> Fix For: 6.1.0
>
> Time Spent: 336h
> Remaining Estimate: 0h
>
> It would be incredibly useful if we allowed for an (optional) second hash
> ring in the consistent hashing in parent selection. Imagine a setup where you
> have two set of parent proxies. A child would prefer to always use a parent
> <n> in ring <A> for a set of URLs, <X>. In the case of parent <n> not being
> available, instead of rehashing <X> to the surviving members of ring <A>, we
> could now hash the URLs to parent <m> in ring <B>. Upon failure there, we'd
> then go back and rehash on the primary ring again (<A>).
> This sounds complicated, but is simple in principle. Instead of immediately
> rehashing content upon a parent failure, we have a backup pool (potentially
> remote) of parents, that are likely to have the content. The idea is to
> minimize origin server traffic at all cost.
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