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https://issues.apache.org/jira/browse/TS-2632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13956504#comment-13956504
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Leif Hedstrom commented on TS-2632:
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[~wbardwel] Yeah, I agree. My initial patch had a new configuration option,
which was also overridable per transaction. I got some negative feedback on
adding a new configuration, so I removed it.
I've attached the original patch for review. William, can you take a look at it
please?
> Range request will always lock object in cache, even thought it's rarely
> cacheable
> ----------------------------------------------------------------------------------
>
> Key: TS-2632
> URL: https://issues.apache.org/jira/browse/TS-2632
> Project: Traffic Server
> Issue Type: Bug
> Components: Cache, HTTP
> Reporter: Leif Hedstrom
> Assignee: Leif Hedstrom
> Fix For: 5.0.0
>
>
> Right now, if a client sends a Range: request, we still lock the URL in the
> cache, under the assumption that it will be written to. Since we don't
> support partial objects, in almost all cases, we'll not write the object and
> therefore release the object.
> I suggest we change this such that we never try to write lock a URL in the
> presence of a Range: header in the client request. This will allow other
> requests to go to origin faster, and better yet, it allows a request without
> a Range: header to properly lock the URL for writing. This turns out to be
> important for implementing e.g. "background filling" as a plugin.
> There is one use case where this might be useful; If the origin does not
> respond with a 206 (partial object), we can now cache the full object.
> However, this is a pretty rare case, and for someone to support this, all you
> have to do is to remove the Range: header on the request.
> I'm opening up this bug right now for discussion, if anyone have any concerns
> about this change, please let me know. It is an "incompatible" change,
> without configuration options, but that should be ok for the v5.0.0 release.
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