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https://issues.apache.org/jira/browse/TS-2362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14091632#comment-14091632
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Alan M. Carroll commented on TS-2362:
-------------------------------------
Updated patch. Should work for all caches from 3.2.0 to 5.1.
In addition to the backwards compatibility, per object version data was added
to provide easier forward compatibility in the future. The cache version was
bumped but that should not cause loss of cache because it's now backwards
compatible!
The basic fragment / doc type was changed so that prior formats (without per
object version data) are easily distinguished without the cost of format
guessing heuristics. The latter are used only when the stripe is indicated to
be a back version.
> Backwards cache compatibility for 4.X (read 3.2)
> ------------------------------------------------
>
> Key: TS-2362
> URL: https://issues.apache.org/jira/browse/TS-2362
> Project: Traffic Server
> Issue Type: Improvement
> Components: Cache
> Reporter: Alan M. Carroll
> Assignee: Alan M. Carroll
> Labels: Review
> Fix For: 5.1.0
>
> Attachments: ts-2362.diff
>
>
> Enable the 4.X series to be able to read 3.2 caches.
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