Can you share more details about namespace delimiters?

Gray Xu

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Mar 31, 2021, 1:19:25 AM3/31/21

to cache-trace

Hi!

I've already found several different special characters, and I have no idea whether they are the delimiters or not.

Can you share more details about namespace delimiters? like some regex?
It will help me a lot!

Thanks so much!

Juncheng Yang

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Mar 31, 2021, 10:30:23 AM3/31/21

to Gray Xu, cache-trace

Hi Gary,

Thank you for your questions! We do not know the delimiters that applications use. We observe that different applications use different delimiters and different numbers of delimiters. But there is no easy way to tell whether something is a namespace or delimiter. We think there is some work can be done in this area to robustly detect the namespace (and thus reduce the key size).

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Gray Xu

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Apr 7, 2021, 4:22:11 AM4/7/21

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Thanks for your reply!

But I'm a little confused that if you don't know the pattern of delimiters, how to preserve them?

peter.waynechina

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Apr 7, 2021, 10:25:53 AM4/7/21

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What do you men by "preserve them"? In cache, the namespace is not treated separately in current systems.

Gray Xu

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Apr 8, 2021, 2:06:42 AM4/8/21

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check readme.md in Github repo, https://github.com/twitter/cache-trace/blob/master/README.md#trace-format

quote "Note that during key anonymization, we preserve the namespaces, ..."

Juncheng Yang

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Apr 8, 2021, 10:45:08 AM4/8/21

to Gray Xu, cache-trace

We assume the namespace is always delimited by special characters (not digit/letter), so we preserve these characters and anonymize the other parts of the keys.

Best,

Jason

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Gray Xu

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Apr 8, 2021, 11:00:45 AM4/8/21

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Oh I see! A straightforward method

And I still have a question. The anonymous process itself does not produce special characters, right?

thanks for your help!

Juncheng Yang

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Apr 8, 2021, 11:30:24 AM4/8/21

to Gray Xu, cache-trace

No, it does not produce those potential delimiters.

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Gray Xu

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Apr 9, 2021, 3:05:50 AM4/9/21

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thank you so much!

it really helps a lot!

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