Github user nickwallen commented on the issue:
https://github.com/apache/metron/pull/969
> Stateful parsing: In one of our to-be-written parsers, we need to read an
external file, parse the file and keep the parsed file in memory. As far as I
can see, Stellar is stateless and not capable of keeping data in memory. It
might be possible by using environment variables, but this approach might get
messy.
With the heavy caching we use I wouldn't expect this to be a problem.
There is also a function like `OBJECT_GET` that allows you to specifically
customize a backing cache. This seems to fit the use case that you are
describing, but I could be wrong.
https://github.com/apache/metron/tree/master/metron-stellar/stellar-common#object_get
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