Dear Nick, Thank you for your response. We measured the latency as you suggested and the time is almost the same. The instance is in Europe and we are doing tests from Madrid and from London.
Here is the problem we see. When we call to the API from a normal computer it takes around 300ms, however when we call it from Google's compute engine the trace is 3 or 4 times that. We don't understand why. Is Google doing some internal operation that increases the request time? are we doing something wrong? Thanks On 24 June 2015 at 20:00, Nick (Cloud Platform Support) <pay...@google.com> wrote: > Hey ssmcookiemonster, > > When debugging latency of a request, it's best to only surround the > request action itself with timing code, so you should profile the time to > execute the following two lines only: > > Future<HTTPResponse> future = fetcher.fetchAsync(url); > HTTPResponse responseHttp = future.get(); > > This will minimize the impact of memory-management, object-creation, > string-buffering, etc., and tend to show a more accurate measure of network > latency. > > Another way to get insight into the problem is to ping / traceroute / mtr > the target of your request from various locations. You might want to run > these diagnostic tools from: > > * your local development box > * a compute-engine instance in the same region as your app (US or EU) > * other locations around the world > > This will allow you get a handle on how traffic will be routed to the > endpoint you're attempting to reach, and the relative latencies from > different locations. > > You may also want to run Url Fetch requests to locations that are closer > to your app and/or development box and see how latency is affected. > > Finally, you can install AppStats (Java > <https://cloud.google.com/appengine/docs/java/tools/appstats> | Python > <https://cloud.google.com/appengine/docs/python/tools/appstats>) on your > app to see the statistics around UrlFetch calls your app makes. > > I hope this information has provided a helpful guide to debugging latency > with Url Fetch. > > > On Wednesday, June 24, 2015 at 4:23:23 AM UTC-4, > ssmcookiemons...@gmail.com wrote: >> >> We have a Java application that make use of urlfetch calling an external >> api. We are having issues with the request time. When we do a request in a >> local environment we have a mean time of 300ms, however in production we >> have times of 1s or 1.4s. >> >> This is the code we are using: >> >> Calendar start = Calendar.getInstance(); >> >> try { >> >> URLFetchService fetcher = >> URLFetchServiceFactory.getURLFetchService(); >> >> URL url = new URL( String.format( API_URL, productsIds ) ); >> Future<HTTPResponse> future = fetcher.fetchAsync(url); >> >> >> HTTPResponse responseHttp = future.get(); >> byte[] content = responseHttp.getContent(); >> >> response = new String(content); >> >> System.out.println("request time :" + >> (Calendar.getInstance().getTimeInMillis() - start.getTimeInMillis() ) ); >> >> >> } catch ( Exception e ) { >> LOGGER.log( Level.SEVERE, "Error calling api : " + e.getMessage() ); >> } >> >> >> Is Google doing any kind of validation that produces this time increase? >> >> Is there a way to reduce the request time? >> >> Thank you very much >> >> >> >> >> >> >> >> >> -- > You received this message because you are subscribed to a topic in the > Google Groups "Google App Engine" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/google-appengine/ryYsvyEily4/unsubscribe > . > To unsubscribe from this group and all its topics, send an email to > google-appengine+unsubscr...@googlegroups.com. > To post to this group, send email to google-appengine@googlegroups.com. > Visit this group at http://groups.google.com/group/google-appengine. > To view this discussion on the web visit > https://groups.google.com/d/msgid/google-appengine/3447916e-079b-4186-be6a-7a84fa99f1ea%40googlegroups.com > <https://groups.google.com/d/msgid/google-appengine/3447916e-079b-4186-be6a-7a84fa99f1ea%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. Visit this group at http://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/CADJ9T2VK36f99-7F4_CmE1-BUrEof4m7FL_xSm_arKpbkaEp6w%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
