What is the prefix 2_ in the key value for cache-store-value when tracing

Question

What is the prefix 2_ in the key value for cache-store-value when tracing

Martin Kallukalam 365

I have a cache store policy as below

<set-variable name="accesstoken" value="BBBB" /> <cache-store-value key="@((string)context.Variables["accesstoken"])" value="@((String)context.Variables["tokenlookupkeyhash"])" duration="60" caching-type="internal" />

when I trace this , I see the corresponding cache store policy showing key as "2_BBBB" Things seems to be working correctly, but why is trace showing key as 2_BBBB and not just BBBB. I am seeing this prefix 2_ in every cache-store-value policy for the key.

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Answer 1

Ben Gimblett 4,550 Microsoft Employee

Hi Thanks for the question

Vitaliy from the product group answered that question here on SO https://stackoverflow.com/questions/72301346/apim-cache-lookup-value-with-external-redis-key-is-always-prefixed-by-2

Martin Kallukalam 365 Reputation points

2024-09-06T15:35:52.4366667+00:00

@Ben Gimblett
I am not using external redis cache. My cache is the builtin internal cache.
So If I read the stackoverflow article, the prefix 2_ is if I use external redis. But I am not
Ben Gimblett 4,550 Reputation points Microsoft Employee

2024-09-06T15:39:00.09+00:00

Hi - But nevertheless this is what they use internally for the cache implementation - and as Vitaliy states the prefix is an internal implementation detail to APIM
Martin Kallukalam 365 Reputation points

2024-09-06T15:42:38.57+00:00

That makes sense.

If I am using the <cache-lookup-value key="key" >
I dont have to prefix 2_ as the key, I just need to use the key I used to store the value- correct?
Ben Gimblett 4,550 Reputation points Microsoft Employee

2024-09-06T16:34:14.35+00:00

that's right

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What is the prefix 2_ in the key value for cache-store-value when tracing

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