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<p style="margin: 10px 0 0 0">So further thought and questions (for both Scotts) before I go back into the code:</p>
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Do we want the option of loading the data from the backing store (rather than even probing the URL) at start? We could schedule a URL probe immediately afterwards. If so do we want to configure it? This is mostly interesting in the case when the tag would say to reload but the metadata was still valid. Seems pretty rare if all you are doing is bouncing an SP...
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Do we want to broaden this FRI such that we can configure which filters are skipped (skipOnBacking="true"?) I don't really like the idea of a specific filter being "special". I wouldn't mind make the default different for the sig check.
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Can I assume that the actual need is to skip the signature check every time that it is the backing file (rather than the URL) that is loaded? That appears to happen quite a lot in a running system - if the URL says "aint' changed" or if the URL is down for instance. In terms of elapsed time you'll only notice it during initial load, but you'll see a dip in CPU as well (particularly if you probe your metadata URL frequently)
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