https://sourceware.org/bugzilla/show_bug.cgi?id=30221
Bug ID: 30221
Summary: Negative cache should differentiate failure types
Product: elfutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: debuginfod
Assignee: unassigned at sourceware dot org
Reporter: vi at endrift dot com
CC: elfutils-devel at sourceware dot org
Target Milestone: ---
Having a negative cache is essential for performant lookups with debuginfod,
but it doesn't differentiate between different types of failure, e.g. transient
(timeout, interrupted, etc) and non-transient (server responded 404 or 410). A
404 error is unlikely to be resolved in as short a timespan as a transient
error, and some servers don't have great debug info coverage, not to mention
local builds. It's very annoying to have to hit tons of builds only to get a
404 so frequently, so it'd be a good idea to have different cache timeouts for
different failure types.
I looked into how the negative cache works, and it looks like it's just the
presence of a 0 byte file. Unfortunately, this means there's no metadata
associated at all, and I'm not sure how tacking on metadata should work in the
first place. xattrs perhaps?
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