Our app uses the Capabilities API to check whether the Memcache service is
available or not, and fall back gracefully if Memcache is unavailable.
However, since the past several days, we are experiencing intermittent
ApiDeadlineExceededException with the following stack trace:
com.google.apphosting.api.ApiProxy$ApiDeadlineExceededException: The API call
capability_service.IsEnabled() took too long to respond and was cancelled.
at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:101)
at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:50)
at
com.google.appengine.api.capabilities.CapabilitiesServiceImpl.getStatus(CapabilitiesServiceImpl.java:29)
Checking our logs, it appears that the Capabilities API had waited for five
seconds before timed out and threw the exception. We would rather have the
app to be immediately falling back gracefully when the Capabilities API is
not available instead of waiting for full five seconds, especially since
the service in question is Memcache. Is there any time-inexpensive way to
check whether the Capabilities API is available or not?
Also, I tried to open a production issue in the googleappengine issue
tracker, but the production issue template and tag seems to be gone.
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