Rumors whisper through the tech sphere that Google App Engine Instances are held back by a strict boundary of 10 concurrent requests. To unravel the truth, let's dive deeper into this alleged limitation.
Does the system prevent requests beyond the tenth from entering the queue, or is there a concealed barrier on parallel threads enforcing this cap? And does this restraint affect all runtimes, including Go, Python, and Java, equally?
As of July 12, 2012, the answer lies in the latter. The 10 concurrent request limit is strictly enforced through a limitation imposed on simultaneous threads across all runtimes. In most instances, the scheduler reacts by attempting to launch a new instance to accommodate incoming requests.
A further clarification comes from an email exchange initiated by jonmac, accessible at https://groups.google.com/d/msg/google-appengine/y-LnZ2WYJ5Q/j_w13F4oSSkJ.
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