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That may help our startup time by not requiring us to read the entire metadata file at once.
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When the source generator is invoked concurrently, it would call
File.OpenReadfor each concurrent use. This maps the file content into memory. Each call gets its own mapped area, and the file will be read once per concurrent use. This ends up taking up lots of memory in some sessions.In this change, we map the file once and create many streams based on it.
This fixes devdiv-1520804