i also have similar error. anyone figured out why this happen?
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is there any technique to send out only channel message if user is
viewing particular ajax page? what technique do you folks use to check
whether user is viewing particular ajax page? because it would be
waste of bandwidth to send out all channel messages to all users
(example 10,000) users if
All of sudden all requests to my instance are erroring out. This particular
instance has was last deployed 12 days ago and there were no issues until
today Feb 24 7PM EST.
From the logs it appears all request are timing out. Even non-data store
operations that are simply initializing the app.
may i know what technique do you folks use to open the application to
particular countries users only during beta stage?
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May i know if memcache down and back to normal service. Will the data
inside memcache still remain or everything will be refresh to blank ?
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Is there any limit of maximum keys i can store in memcache in any
particular time. Can store billions of keys as long as each key not
exist hardlimit 1 mb? Is there any exacts number?
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Let say we deploy ver 1 of our app and set memcache. After that delete
version 1 of the app. One hour later we redeploy version 1 d the app.
Is memcache data still there?
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how to force user to use ssl with sessions-enabled ? if user using
http, direct forward to https.. possible?
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Yes, i understand gae autoscale by increasing more instances of
servers. i would like to understand singleton run on different gae
instance (cluster) . let say we have userA on instanceA, set a
variable on the sigleton java class.
Question: will userB in instanceB able to see the variable see by
yes i awared memcache and do this. beside memcache is there any other
way? i though is memcache has tendency to go down out of service as
well.
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i know the limit of list property is 5000 indexes.
if i have entity that look like below
Entity
{
ListLong firstProperty;
ListLong secondProperty;
ListLong third Property;
}
can my entity have maximum 15000 list properties, since i have 3
different object?
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let say our code is buggy and there is memory leak. but somehow the
aplication still run well. when instance of server run out of memory.
will appengine auto scale it for more memory ? would be good as
temporary measurement to handle such situation right?
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application B is real gwt application. application A is use to crawl
application B. if the page content is minimum then no timeout. but
when the content is lot then it timeout 99% of the time. can google
team set sockettimeout longer or dont set timeout for users that
enabled billing?
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yes. after enable threadsafetrue/threadsafe , still getting
java.net.SocketTimeoutException: Timeout while fetching
my applicationA is crawler with HTMLUnit, in appengine, it is uses to
crawl applicationB inside appengine as well. I only need to enable
always on for applicationA only right?
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i'm using webclient and i get this error
java.net.SocketTimeoutException: Timeout while fetching
com.gargoylesoftware.htmlunit.UrlFetchWebConnection getResponse:
Exception while tyring to fetch
.I already set my app to use always on feature. but still getting
timeout error.
1. Anyway to
I have created a servlet which requests a webpage, parses the html and
retrieves information from it.
This works fine locally. However when I deploy the application it doesn't
retrieve the webpage.
Can anyone tell me what might be the problem?
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for the example given regarding group count.
1.student market is incremented from 16 to 17 and saved()
2.the incremented value 17 is passed to 2 task queues .
3. each task queue has this checkingmarker.sequence [from
marker.get() ] = sequence [from value passed in through task queue]
if
1.let say student is updated and marker is incremented from 16 to
17 . 2 tasks are fired call taskA, and taskB
2. then student is update again and market is incremented from 17 to
18. another 2 tasks are fired call task C, and task D.
Is there any gurantee task set (A, B) will be execute
i'm refering to Building Scalable Web Applications by Brett Slatkin
regarding building comments system that need fast write.
1. May i know whether my understanding correct, creating multiple
entity class like below and randomly write to each of it ?
example
commentA entity class, commentB
let say we use cursor and we fast-forward page.
1-10
11-20 when reached here, one record in 23 is deleted
21-30
on in this case, when cursor is at 21, it will only show 9 record on
this page correct?
In other words, we cannot use global count (total records) for paging
unless we will have to
when using channel api, we need to keep track of all users so that we can
loop through the list and send broadcast message to all. how to know whether
user still connected without require user to frequently send ping back to
server that they are still opening browser?
what technique do
how to control what files allow to upload to blobstore by inspecting the
contenttype because if we put blobstoreService.createUploadUrl(/upload) ,
the upload servlet will only be call if file already finished successfully
uploaded. Can the control be implemented at the point before entire file
thanks @Roberto. But i looking for server side checking
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may i know when using blobstore, is cpu time is charged ? or only charged
depending on size of the file uploaded?
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There is limit of max 5 times write per second for entity. So
theoritically, by using async nonblocking feature, this can be
overcome by async put() right?
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to process your results that it really
matters they be done in the optimal order?
All that polling code is complicated... unless you're shaving off a
lot of real-world time, seems like it's better to just launch all
batches and block on the first one.
Jeff
On Wed, Dec 1, 2010 at 8:44 PM, Luke
could use an
explicit Async method to fetch the entities themselves. if i query
for keys, will they be split up in batches? any way to know how many
keys will be in one batch?
On Nov 29, 11:08 am, Max Ross (Google) maxr+appeng...@google.com
wrote:
Hi Luke,
First the awesome news:
As of 1.4.0
i was taking a look at the 1.4.0 javadoc for AsyncDatastoreService. i
see the get, put and delete operations return a Future, but the
prepare methods return a naked PreparedQuery object, and it doesn't
look like PreparedQuery has any async get methods.
does the AsyncDatastoreService not support
proper. I'm
unable to interact with the XML/HTTP part.
Obviously neither project has a setup which gives app engine
indigestion, as both run happily when they're not placed together.
Might anyone know of differences in the dev server which would explain
this?
Thanks,
Luke.
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