date:20110928

You're right: there are no guarantees around how long an item will stay in
Memcache. Memcache has two Least-Recently-Used lists of items, where if you
don't read or write an item, it may be pushed off the list for space.
There's a per app LRU and a global LRU for apps sharing the same memcache
instance.

5 minutes seems extremely short (typical eviction time of an untouched item
is on the order of magnitude of a few hours), however, and I'm fairly
certain with your memory size it's probably not the local LRU. I don't have
any suggestions for the moment, but perhaps you can track the hit rate with
getStatistics and try to determine some patterns?

http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/memcache/MemcacheService.html#getStatistics()

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On Tue, Sep 27, 2011 at 2:11 AM, Peter Nees peter.n...@unclestock.comwrote:

My objects remain in the memcache only for about 5 minutes. I know that
there is no guarantee about the caching period, but this seems abnormal.
I've read that lack of memory could be the reason. The size of one object
is about 50K, and I typically cache less as 50 objects.
I have no flush statements in my code don't remove objects.
What can be the reason for this, or how can I look for the reason?

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Re: [appengine-java] Re: Disable 'refresh' in a page

I agree with everything everyone has said about disabling refresh. Don't
interrupt basic browser functions. It's a bad idea.

What problem are you trying to solve? There is probably a more intuitive way
of doing this.

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On Tue, Sep 27, 2011 at 5:02 AM, Drew Spencer slugmand...@gmail.com wrote:

 I agree with Mat. Just tell your users not to refresh or give them no
 reason to. They aren't stupid. It's like when a site prevents me
 right-clicking - I hate that site and never go back.

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Re: [appengine-java] Google App Engine Internet Crawler

You'll probably have to use chaining task queues or the backends API:

http://code.google.com/appengine/docs/java/backends/overview.html

This has the tendency to be pretty expensive, though, and you don't really
get any benefits from using App Engine, so you might be better off crawling
the internet with idle computer/bandwidth at your university.

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On Tue, Sep 27, 2011 at 4:55 AM, Rodel Ocampo rrocamp...@gmail.com wrote:

 Good day Developers!

 Any idea on how to crawl the internet in Google App Engine - Java? My
 thesis requires me to search a book in the internet just using the book's
 ISBN. Thank you very much. :D

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Re: [appengine-java] All prices being shown as $0.00 under Billing History

Do you have an affected app ID we can look at?

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On Mon, Sep 26, 2011 at 9:22 PM, Arun Ramanujapuram
arun_rama...@yahoo.comwrote:

 Hi,

 All prices are being shown as $0.00 under the Billing History page on the
 admin. console as of 9:20pm PST. If this is not the correct forum to raise,
 please let me know.

 Thanks,
 Arun

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Re: [appengine-java] Transactions on entities in different entity groups ?

You currently can't, but we plan on rolling out a feature that will do this
in the next few releases. It's currently in trusted tester at the moment.

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On Mon, Sep 26, 2011 at 10:59 PM, Santosh kumar kopp@gmail.com wrote:

 Hi,

 I want to know how to create/update the entities which are in different
 entity groups ?

 for ex: I want to update the *apple* and *carrot* entities in a
 transaction but those parents are not same. (Here i am in such a situation)



 Thanks in advance :)



 *S*antosh *K*umar *K* http://www.accountingguru.in/**

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Re: [appengine-java] Will user service be available for DeferredTask?

No, deferred tasks run in a task queue. You will probably want to persist
the user in the datastore and pass the userId as a parameter to the deferred
task to be fetched.

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On Fri, Sep 23, 2011 at 11:38 PM, -sowdri- sow...@gmail.com wrote:

 Hi,

 In case, the deferred task need to identify the user who ran the task, will
 the state of userservice be available for the task being executed?

 thanks,

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[appengine-java] createEntityManager() taking too long

2011-09-28 Thread Sekhar

I'm using JPA and see that calls to createEntityManager() are taking several 
seconds (e.g., 6 seconds). This is with HRD and reserved instances. And it's 
not the first time either, subsequent calls are also slow. Is anyone else 
seeing this, and is there a way to speed these up?

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[appengine-java] Re: NameSpaceManager getGoogleAppsNamespace()

2011-09-28 Thread Satish

Vishal,

Did you ever find out an answer for this question? Thank you for your help

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Re: [appengine-java] Will user service be available for DeferredTask?

2011-09-28 Thread -sowdri-

Thanks, 

Regarding local-unit testing of Appengine deferred task,  I don't find a way 
to use any other queue but the default queue. 
http://code.google.com/appengine/docs/java/tools/localunittesting.html

Is there a way to specify the name of the queue to use in local-unit 
testing. 

In spite of the fact that the ability to select queues will not make any 
difference from the testing perspective, that will certainly help to test 
deferred task that's part of the production code, without modifying it for 
testing purpose. 

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[appengine-java] Re: Namespace not being set from google apps

2011-09-28 Thread Satish

Update:
I am going to try explicitly setting the namespace value to the value 
carried by com.google.appengine.api.users.UserService.user_organization 
instead of NamespaceManager.getGoogleAppsNamespace() method. I wish the 
latter worked but it's not. user_organization is being set correctly to the 
calling domain on the other hand.

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[google-appengine] Re: Using other code in a backend

2011-09-28 Thread Hans Then

Will this also work in the development server? I have not seen an
option to start the Java development server and the Python development
server with the same datastore.

Regards,

Hans Then

On Sep 27, 5:53 am, Greg Darke (Google) darke+goo...@google.com
wrote:
 Yes it is quite easy to do. The easiest way is to create a separate
 directory containing the code for the backend, then just upload the
 backend (be sure to not accidentally upload the code over your default
 version).

 Though be careful with configuration that is not scoped to a specific
 version: indexes, queues, cron, dos. You should ensure that you
 specify the same information in the configuration for both languages.

 Testing a solution that uses multiple languages can be quite difficult
 (and is generally easiest to test the application by deploying to a
 test app-id).

 On 27 September 2011 04:54, Hans Then hans.t...@gmail.com wrote:







  Hi all,

  Is it possible to create a backend containing another program than the
  main instance? Specifically, is it possible to create a backend using
  a different programming language e.g. Java in the backend and Python
  in the main instance?

  Regards,

  Hans Then

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Re: [google-appengine] Re: Using other code in a backend

2011-09-28 Thread Greg Darke (Google)

No,

It is best to test the interaction of the two versions by deploying them.

On 28 September 2011 16:17, Hans Then hans.t...@gmail.com wrote:

 Will this also work in the development server? I have not seen an
 option to start the Java development server and the Python development
 server with the same datastore.

 Regards,

 Hans Then

 On Sep 27, 5:53 am, Greg Darke (Google) darke+goo...@google.com
 wrote:
  Yes it is quite easy to do. The easiest way is to create a separate
  directory containing the code for the backend, then just upload the
  backend (be sure to not accidentally upload the code over your default
  version).
 
  Though be careful with configuration that is not scoped to a specific
  version: indexes, queues, cron, dos. You should ensure that you
  specify the same information in the configuration for both languages.
 
  Testing a solution that uses multiple languages can be quite difficult
  (and is generally easiest to test the application by deploying to a
  test app-id).
 
  On 27 September 2011 04:54, Hans Then hans.t...@gmail.com wrote:
 
 
 
 
 
 
 
   Hi all,
 
   Is it possible to create a backend containing another program than the
   main instance? Specifically, is it possible to create a backend using
   a different programming language e.g. Java in the backend and Python
   in the main instance?
 
   Regards,
 
   Hans Then
 
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[google-appengine] Re: general problems with the channel api

2011-09-28 Thread CAA

The Solution is that 
script src='/_ah/channel/jsapi'/script
refers to 
https://talkgadget.google.com/talkgadget/channel.js
which is on the blacklist of the proxy


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Re: [google-appengine] Re: How to set more than 3 Resident instance

Hi Poke,

Is your application using Python or Java ? What is your application id ?

1/ 2/ I don't think raising Min-Idle-Instance would help your cost to
go down, on the opposite it is likely to introduce new costs since the
scheduler will make sure there is always at least Min-Idle-Instance
around to serve potential traffic spike.

I think you should consider paying for *Reserved Instance Hours* once
the new pricing model is out.

As described here:
http://code.google.com/appengine/kb/postpreviewpricing.html#different_on_demand_instance_reserved

It will allow you to get a discount on instances hours by
pre-committing to a certain amount of instance hours per week.

3/ About Cache-Control header, can you give us a public url of one of
your handler that is reproducing this issue ?

Thanks in advance.

On Wed, Sep 28, 2011 at 3:30 AM, poke buidinhngoc.a...@gmail.com wrote:

Thanks .
But please answer me 3 question to help me understand , how it work ?

On Sep 28, 2:27 am, Tapir tapir@gmail.com wrote:
Your app handles 20 req/s, which means 1.728M req/day.
If each page uses 3.5 requests, then you app has 500K pageviews/day.
I think you at least 3-6 full instances to run your app.
I don't think there is a way you can spend under 30$.day on app
engine
with the new price model.

On Sep 27, 6:27 pm, poke buidinhngoc.a...@gmail.com wrote:

My application using about 20 req/s .
I tried many ways to optimize my application before new price model apply
.
But daily cost always getter than 30$ perday .I have 3 question .

1.I think i increase number of resident instances will help cost go to
down
. I'm true ?
2.How to increase number of resident instances ? And how many Resident
instances are fit for me ?
3.On dynamic page i set two header Cache-Control: public, max-age=300 and
Exprites : one hourse after.
But number of requests to instance,resource usage,RPC apis not down .

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Re: [google-appengine] 500 response codes

Hi Vik,

Thanks for reporting this issue.

Please consider filling a Defect on the public issue tracker:
http://code.google.com/p/googleappengine/issues/entry?template=Other%20defect

Thanks in advance.

On Tue, Sep 27, 2011 at 1:15 PM, vik vmgu...@gmail.com wrote:
 Hello,

 I got a 500 Internal Server Error response code from App Engine with
 the following description in one of the WARNING prints (I saw this in
 the myApp/dashboard/logs).

     Request was aborted after waiting too long to attempt to service
 your request. This may happen sporadically when the App Engine serving
 cluster is under unexpectedly high or uneven load. If you see this
 message frequently, please contact the App Engine team.    

 With such a description I believe I should get a 503 Service
 Unavailable instead of 500 Internal Server Error. Getting a 503
 will at least hint the client to retry after a short duration which is
 the correct behavior. In this case, I got a 500 and hence did not
 retry.

 Am I missing something?

 Regards,
 Vikram

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Re: [google-appengine] Re: cache directory

Hi,

AFAIK there is no way to configure the path of the datastore directory yet.

Feel free to fill a feature request here:
http://code.google.com/p/googleappengine/issues/entry?template=Feature%20request

Thanks in advance.

On Tue, Sep 27, 2011 at 2:51 PM, freak182 eman.noll...@gmail.com wrote:

 Thanks.
 I am using java..How can I configure the datastore directory?


 On 27 Set, 01:27, Barry Hunter barrybhun...@gmail.com wrote:
  Its probably your local datastore
 
  http://code.google.com/appengine/docs/python/tools/devserver.html#Usi...
 
 
 
 
 
 
 
  On Mon, Sep 26, 2011 at 4:57 PM,freak182eman.noll...@gmail.com wrote:
   Hi,
 
   I am new to app-engine and i have notice when i am uploading my app,
   the my user/Temp directory is holding cache files which is big. Now,
   any idea how to configure this directory to point to another
   directory.
 
   thanks.
   cheers.
 
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Re: [google-appengine] Risk mitigation, data storage

Hi,

I believe a similar topic has been already discussed here:
http://stackoverflow.com/questions/6040673/encrypting-user-data-on-app-engine

Hope that helps.

On Tue, Sep 27, 2011 at 1:52 AM, ThePiachu thepia...@gmail.com wrote:
 I want to create an app on GAE that will store semi-valuable data of
 users. Specifically, private and public encryption keys that will be
 used by the app to perform some encrypting and decrypting. I want to
 minimise the risk of users' data being stolen, so I intend on using
 account authorisation with Google account, but I am wondering if there
 is any way I can go beyond that? Is there some way to store my users'
 data so even if someone would get into the administrative account
 wouldn't be able to get? Is there some solution of encrypting the data
 so as only the user would be able to decode it with their account?

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[google-appengine] Cannot delete index in ERROR state

2011-09-28 Thread Daniel Florey

Hi,
I've been trying to delete an index that went into ERROR state.
It started to delete but after a while it switched back to ERROR. Now I'm 
not even able to start the deletion.
Can someone please help?
app-id: floreysoftucm

Thanks,
Daniel

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[google-appengine] Http Proxy from DevServer leads to Class Cast Exception

2011-09-28 Thread Gregor Frey

When I access an http-service via proxy on the local dev server I get
a class cast exception. On the real engine everythitng works well.
This is the stack trace:

java.lang.ClassCastException:
com.google.appengine.repackaged.org.apache.http.message.BasicHttpRequest
cannot be cast to
com.google.appengine.repackaged.org.apache.http.client.methods.HttpUriRequest
at com.google.appengine.api.urlfetch.dev.LocalURLFetchService
$7.run(LocalURLFetchService.java:427)
at com.google.appengine.api.urlfetch.dev.LocalURLFetchService
$7.run(LocalURLFetchService.java:409)
at java.security.AccessController.doPrivileged(Native Method)
at
com.google.appengine.api.urlfetch.dev.LocalURLFetchService.doPrivilegedExecute(LocalURLFetchService.java:
409)
at
com.google.appengine.api.urlfetch.dev.LocalURLFetchService.fetch(LocalURLFetchService.java:
377)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.appengine.tools.development.ApiProxyLocalImpl
$AsyncApiCall.callInternal(ApiProxyLocalImpl.java:474)
at com.google.appengine.tools.development.ApiProxyLocalImpl
$AsyncApiCall.call(ApiProxyLocalImpl.java:436)
at com.google.appengine.tools.development.ApiProxyLocalImpl
$AsyncApiCall.call(ApiProxyLocalImpl.java:415)
at java.util.concurrent.Executors$PrivilegedCallable
$1.run(Executors.java:463)
at java.security.AccessController.doPrivileged(Native Method)
at java.util.concurrent.Executors
$PrivilegedCallable.call(Executors.java:460)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor
$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor
$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)

I assume its a bug in the LocalURLFetchService or in the
ApiProxyLocalImp. Are there any workarounds?

Gregor

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[google-appengine] (Urgent) App upload: Error 400

2011-09-28 Thread Amine Azariz

Application: ; version: 2-2
Host: appengine.google.com

Starting update of app: , version: 2-2
Scanning files on local disk.
Scanned 500 files.
Cloning 51 static files.
Cloning 464 application files.
Cloned 100 files.
Cloned 200 files.
Cloned 300 files.
Cloned 400 files.
Uploading 2 files and blobs.
Uploaded 2 files and blobs
Compilation starting.
Compilation completed.
Starting deployment.
Rolling back the update.
Error 400: --- begin server output ---

Client Error (400)
The request is invalid for an unspecified reason.
--- end server output ---

Please let us know what's happening.

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[google-appengine] About the firewall logs

2011-09-28 Thread Tsutomu Fukumori

Hello,

I am using app engine.
Please tell me about Firewall logs.

1. More than one year, Firewall logs are save?
2. When problem happened or I want it, Would you please check for
Firewall logs and tell me survey results?

Sorry to bother you, but I have an urgent favor that I need to ask you
to do for me.
Any help would be greatly appreciated.

Thanks and Regards,

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[google-appengine] Google app engine Upload

2011-09-28 Thread sharad biradar

Hi,
Google App engine not taking changes  after uploading new version of
application.

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[google-appengine] Yet another new pricing request

2011-09-28 Thread Mat Jaggard

I'm finding it really frustrating when working out what my (partially
written) application might cost me on GAE. I don't have the option to
compare with my current billing, because I haven't finished writing it
yet. The documentation on costs is really confusing - can you tell me
where the DEFINITIVE costs are and why the following sources disagree.
I think updating the second of these should be a pretty high priority
- it's the front page to GAE for businesses but contains incorrect
details (or at least I assume it does unless datastore reads really
are 7 times more expensive than writes?!)

https://appengine.google.com/billing/history?app_id=...
http://www.google.com/enterprise/cloud/appengine/pricing.html
http://code.google.com/appengine/docs/billing.html

Thanks,
Mat.

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[google-appengine] Re: like operator in GQL

2011-09-28 Thread bbaychev

Have you tried SQLite syntax?

On Sep 26, 11:55 pm, someone1 someo...@gmail.com wrote:
 Not available in GQL but I've had success utilizing IndexTank for full-
 text search capabilities with AppEngine

 On Sep 25, 2:55 pm, Bruce Aloe brucea...@gmail.com wrote: Hello,

  SQL supports like operator. I am wondering whether GQL supports the
  like operator or not.

  I have been looking at the GQL 
  reference:http://code.google.com/appengine/docs/python/datastore/gqlreference.html

  However, the document doesnot mention anything it.

  Is there any official document talking about this issue?

  Any help is appreciated. Thanks.

  Bruce

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[google-appengine] Re: Remove logging from app engine

2011-09-28 Thread bbaychev

The log would save only parameters values if you are sending GET
requests over HTTP. Consider using HTTPS along with POST requests,
search for security constraints + GAE and how to force all trafic over
HTTPS with the CONFIDENTIAL key.
If you want the logger to show no trace of your requests, you will
have to disable it.

On Sep 27, 10:42 pm, Brian Williams tribblehunter2...@gmail.com
wrote:
 Hi. I am currently using app engine to email from app inventor app. Need
 information securely emailed and not saved in cloud. Am using Shival Wolfs
 wolf web mail using TWDB.

 Works well but i need to know if i can stop the log files being created in
 app engine. They are storing the data sent and i wish it to not be stored.

 Can anyone advise or point me towards building the solution please?

 Many thanks.

 Brian

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[google-appengine] Re: Using memcache might be free, but it's costing you money with instance pricing! Use instance caches if possible.

2011-09-28 Thread Paolo Casciello

Remember to implement a mutex system in the in-process caching mechanism or 
your instance will fail randomly when the new py2.7 version will be rolled 
out.


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[google-appengine] Re: Google app engine Upload

2011-09-28 Thread Gwyn Howell

how long is ages?! and how big is your app?!

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Re: [google-appengine] Re: like operator in GQL

2011-09-28 Thread Niklas Rosencrantz

These are among the drawbacks, minuses and reasons why app engine should be
cheaper than traditional hosting:
- no join, no like, no full text search while sql-based system have these
- extremely difficult to migrate from M/S to HRD while sql-based system
usually can migrate even large blobs
- sitemap.xml.gz has no good solution, you have to roll your own whereas
legacy systems have ready solution to make a sitemap
- admin console with federated login breaks (other have phpmyadmin or tons
of other solution while I don't have a backup system so my system is not
real)
- it's not good but it's the best we got? regards \niklas

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[google-appengine] GQL Not Recognising a ReferenceProperty in Filter

2011-09-28 Thread G Heslop

TL/DR: I am unable to get a reference property to be recognised as part of a 
query filter.

I have a datastore thats filled with ~850 groups and ~19,000 items. Each 
item may belong to only one group, I have two models in my app that 
represent a Group and an Item:

class Group(db.Model):
Id = db.IntegerProperty()
Name = db.StringProperty()
# ... some other  properties

class Item(db.Model):
Id = db.IntegerProperty()
Name = db.StringProperty()
Group = db.ReferenceProperty(Group, collection_name=groupItems)
# ... some other properties

I can use the datastore admin to view a specific item (i.e. WHERE Id = 34) 
and see that it is connected correctly to a Group - 

SELECT * FROM Item WHERE Id = 34

This gives me a group with the following properties:

*Decoded entity key:* *Group: 
id=10321*https://appengine.google.com/datastore/edit?app_id=s%7Eeve-minernamespace=version_id=eve-copilot-live.353587300539242520key=agtzfmV2ZS1taW5lcnIMCxIFR3JvdXAY0VAM
**
***Entity key:* agtzfmV2ZS1taW5lcnIMCxIFR3JvdXAY0VAM
*Id:* 18
If I alter my GQL query to retrieve all items for this Group I get no 
results! -

SELECT * FROM Item WHERE Group = 
KEY('agtzfmV2ZS1taW5lcnIMCxIFR3JvdXAY0VAM') -- No Results
SELECT * FROM Item WHERE Group = KEY('Group', 
'agtzfmV2ZS1taW5lcnIMCxIFR3JvdXAY0VAM') -- No Results

If I retrieve just the group, it works as expected - 

SELECT * FROM Group WHERE __key__ = 
KEY('agtzfmV2ZS1taW5lcnIMCxIFR3JvdXAY0VAM')  -- Returns 1 Group

This equally applies in my Python code. Calling:

group = Group.gql(WHERE Id = :1, 18).get()
items = Item.gql(WHERE Group = :1, group).fetch(50)

results in a list containing no items. Similarly

group.groupItems.fetch(500) -- Returns no results

My question is - am I doing something particularly stupid? I have created a 
dummy project with a similar structure to prove to myself that it wasnt a 
naming problem (i.e. that Group wasn't a reserved word) and that returns 
just fine. (Attached if anyone is interested).

What am I doing wrong?

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[google-appengine] Re: cache directory

2011-09-28 Thread freak182

Hi,

added a feature request:

http://code.google.com/p/googleappengine/issues/detail?id=5989thanks=5989ts=1317223820

cheers

On 28 Set, 18:10, Johan Euphrosine pro...@google.com wrote:
 Hi,

 AFAIK there is no way to configure the path of the datastore directory yet.

 Feel free to fill a feature request 
 here:http://code.google.com/p/googleappengine/issues/entry?template=Featur...

 Thanks in advance.









 On Tue, Sep 27, 2011 at 2:51 PM, freak182 eman.noll...@gmail.com wrote:
  Thanks.
  I am using java..How can I configure the datastore directory?

  On 27 Set, 01:27, Barry Hunter barrybhun...@gmail.com wrote:
   Its probably your local datastore

  http://code.google.com/appengine/docs/python/tools/devserver.html#Usi...

   On Mon, Sep 26, 2011 at 4:57 PM,freak182eman.noll...@gmail.com wrote:
Hi,

I am new to app-engine and i have notice when i am uploading my app,
the my user/Temp directory is holding cache files which is big. Now,
any idea how to configure this directory to point to another
directory.

thanks.
cheers.

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[google-appengine] Bug (issue 5782) has essentially disabled the dev server for me

2011-09-28 Thread tempy

After updating one of my machines to java sdk 1.5.4, sdk 1.5.2
mysteriously disappeared from the machine. I can't use 1.5.4 or 1.5.3
in development-mode on this machine because of this bug:

http://code.google.com/p/googleappengine/issues/detail?id=5782can=5colspec=ID%20Type%20Component%20Status%20Stars%20Summary%20Language%20Priority%20Owner%20Log

Since the disappearance of 1.5.2, I basically have to develop in 1.5.4
and UPLOAD the app to a test version just to test my changes, the dev
server is completely fried. This is seriously impacting my work. Does
anyone know any workarounds or how to obtain an old version of the
java sdk?

Thanks!

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[google-appengine] Re: hosting a c compiler on gae

2011-09-28 Thread madmax

Hi,
  It looks like I have to move away from app engine if I want to host
a compiler. I did a thorough search and seems no way I can host a
compiler on gae  efficiently.
Sad that I will have to rebuild the website again from scratch to the
specifications of another infrastructure. Last hope.. Any alternatives
possible?? Even remote possibilities . Does google provide any
instances??

   App engine should provide more features to developers to make
itself as a serious platform for web development.

Thanks and Regards,
Mahendra Naik

On Aug 2, 8:28 am, Robert Kluin robert.kl...@gmail.com wrote:
 Or compilers implemented in Java.  Might be more likely to find those.







 On Mon, Aug 1, 2011 at 21:54, Greg g.fawc...@gmail.com wrote:
  You could have another server provide a compile service, and have your
  Appengine app communicate with it via URLfetch, as you suggest. There
  will be inefficiencies here obviously, and you'll have to contend with
  the URLfetch size and time limits.

  You could also look for pure python compilers, which could run on
  Appengine.

  Cheers
  Greg.

  On Jul 31, 10:45 pm, madmax mahendra0...@gmail.com wrote:
  Hi,

     I am writing a coding website. I want to provide an option to the
  users to compile their c,c++ or java code. Basically I want to host a
 compilerin my app. Some google links said that it is not possible to
  host an external program on gae. Is there any alternative? Like
  connecting to a Linode or linking to amazon ec2 ??  Any pointers would
  be great.

  Thanks and Regards,
  Mahendra Naik

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[google-appengine] Problem with blobstoreService.getUploadedBlobs(request)

2011-09-28 Thread Bat

Hi,

I've a problem with the methode blobstoreService.getUploadedBlobs().
I've a JSP page in wich one I set an uploader like this :

formname='form'  action='%= blobstoreService.createUploadUrl(/
Edit_Engine) %' method='POST' enctype='multipart/form-data' 
input label='...' multiple='false' name='myFile' /
//...and multiple input for text
/form

and I retrieve this code with my servlet :

java.util.MapString,BlobKey blobs =
blobstoreService.getUploadedBlobs(req);
BlobKey blobK  = blobs.get(myFiles[]); //I don't know why I need to
add the characters 's[]' at the end...

But the behavior is strange. The first time I upload an image,
everything works. However, the second time, I send my form without
uploading somehting (only text data), and then my java code finds a
BlobKey. But this BlobKey seems to be the previous sended data, or a
corrupted data.
I mean that not normal, because when I deploy this version on my
localhost, if the form uploads no file the method getUploadedBlobs
returns an empty HashMap. However, when I deploy on google servers, if
the form uploads no file, the method getUploadedBlobs seems  to return
a HashMap with wrong data.

Could you help me? Or tell me if this behaviro is normal...

Many thanks,

bat

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Re: [google-appengine] Bug (issue 5782) has essentially disabled the dev server for me

2011-09-28 Thread TreKing

On Wed, Sep 28, 2011 at 10:55 AM, tempy fay...@gmail.com wrote:

 Does anyone know any workarounds or how to obtain an old version of
 the java sdk?


Just replace the 4 with a 2. =)

http://googleappengine.googlecode.com/files/appengine-java-sdk-1.5.2.zip

-
TreKing http://sites.google.com/site/rezmobileapps/treking - Chicago
transit tracking app for Android-powered devices

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Re: [google-appengine] Re: hosting a c compiler on gae

2011-09-28 Thread Jeff Schnitzer

Host a compiler is too vague.  Even Host a C compiler is too vague.

What do you want to compile?  What do you want it to compile to?  For
what platform?

If you're creating a compile farm, you really want an environment that
can run gcc natively.  That will never be GAE for a million very good
reasons.  That said, compilation consumes significant cpu and io
resources and is probably not something you ever want to do on a web
frontend unless you want to risk a painful user experience.  Farm it
out to Linode or EC2 or whatnot.

I doubt you're going to find a C cross-compiler implemented in Python
or any of the JVM-based languages.  If you really wanted to get crazy
you could try to cross-compile gcc to java bytecode, which should
work, but you'll have to abstract out the i/o libraries to work
without filesystems.  A sufficiently dedicated (read: insane) engineer
could probably pull this off with enough effort, but why...

Jeff

On Wed, Sep 28, 2011 at 9:56 AM, madmax mahendra0...@gmail.com wrote:
 Hi,
  It looks like I have to move away from app engine if I want to host
 a compiler. I did a thorough search and seems no way I can host a
 compiler on gae  efficiently.
 Sad that I will have to rebuild the website again from scratch to the
 specifications of another infrastructure. Last hope.. Any alternatives
 possible?? Even remote possibilities . Does google provide any
 instances??

   App engine should provide more features to developers to make
 itself as a serious platform for web development.

 Thanks and Regards,
 Mahendra Naik

 On Aug 2, 8:28 am, Robert Kluin robert.kl...@gmail.com wrote:
 Or compilers implemented in Java.  Might be more likely to find those.







 On Mon, Aug 1, 2011 at 21:54, Greg g.fawc...@gmail.com wrote:
  You could have another server provide a compile service, and have your
  Appengine app communicate with it via URLfetch, as you suggest. There
  will be inefficiencies here obviously, and you'll have to contend with
  the URLfetch size and time limits.

  You could also look for pure python compilers, which could run on
  Appengine.

  Cheers
  Greg.

  On Jul 31, 10:45 pm, madmax mahendra0...@gmail.com wrote:
  Hi,

     I am writing a coding website. I want to provide an option to the
  users to compile their c,c++ or java code. Basically I want to host a
 compilerin my app. Some google links said that it is not possible to
  host an external program on gae. Is there any alternative? Like
  connecting to a Linode or linking to amazon ec2 ??  Any pointers would
  be great.

  Thanks and Regards,
  Mahendra Naik

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Re: [google-appengine] Re: Remove logging from app engine

2011-09-28 Thread Brian Personal

Thank you baychev. Due to using app inventor and being a newbie at this
certain things are beyond my control or knowledge. But I am learning fast
and AI is growing with MIT's help in new year (I hope). I will take your
advice and be reading the documentation over the next few weeks.

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[google-appengine] Re: Bug (issue 5782) has essentially disabled the dev server for me

2011-09-28 Thread tempy

TreKing,

You, sir, are my hero.

On Sep 28, 6:20 pm, TreKing treking...@gmail.com wrote:
 On Wed, Sep 28, 2011 at 10:55 AM, tempy fay...@gmail.com wrote:
  Does anyone know any workarounds or how to obtain an old version of
  the java sdk?

 Just replace the 4 with a 2. =)

 http://googleappengine.googlecode.com/files/appengine-java-sdk-1.5.2.zip

 --- 
 --
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 transit tracking app for Android-powered devices

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[google-appengine] Re: like operator in GQL

2011-09-28 Thread roberto.cr

there are many differences between traditional relational databases
(like mysql) versus non-relational databases, aka nosql (like gae's
datastore)

but yes, Full-text search over Datastore is coming really soon

App Engine Product Roadmap
http://code.google.com/intl/en/appengine/docs/roadmap.html

Google I/O 2011: Full Text Search
Bo Majewski, Ged Ellis
http://www.youtube.com/watch?v=7B7FyU9wW8Y
(I recommend everyone here to take a look at it, it's really nice)

there were 2 main problems when I switched from my traditional mysql-
thinking to datastore-thinking: geo search and full text search.
the first is solved using GeoModel (made by some fine Google
employees), the second will come as a Google solution (see the video).

so I'm extremelly happy with GAE :) I hope you enjoy it too, Bruce.

On Sep 28, 10:18 am, Niklas Rosencrantz nikla...@gmail.com wrote:
 These are among the drawbacks, minuses and reasons why app engine should be
 cheaper than traditional hosting:
 - no join, no like, no full text search while sql-based system have these
 - extremely difficult to migrate from M/S to HRD while sql-based system
 usually can migrate even large blobs
 - sitemap.xml.gz has no good solution, you have to roll your own whereas
 legacy systems have ready solution to make a sitemap
 - admin console with federated login breaks (other have phpmyadmin or tons
 of other solution while I don't have a backup system so my system is not
 real)
 - it's not good but it's the best we got? regards \niklas

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[google-appengine] Outage

2011-09-28 Thread Joshua Smith

I'm seeing tons of server errors across all my apps right now.


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Re: [google-appengine] Outage

2011-09-28 Thread Joshua Smith

(except my one on HR).  static page serving seems to be particularly screwed up.

On Sep 28, 2011, at 4:14 PM, Joshua Smith wrote:

 I'm seeing tons of server errors across all my apps right now.
 
 
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[google-appengine] Re: Outage

2011-09-28 Thread Ronoaldo José de Lana Pereira

All my apps are all showing up errors too. But seems to be related to 
session stored data, not all datastore queries timeout.

Status page was showing 97% availability.

Let's wait to GAE team to give some info ...

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Re: [google-appengine] Re: hosting a c compiler on gae

I agree with your statement about features, but it does not apply to your
use case of hosting a compiler.

The way you'd probably design this? Use App Engine for the web portion. Save
the code to the blobstore, push the job to the task queue pull queue (
http://code.google.com/appengine/docs/java/taskqueue/overview-pull.html),
then have a compiler running in a Linux instance that pulls this
information, downloads and compiles the code, pushes compiled code back to
blobstore for serving. Of course, the compiled code isn't guaranteed to run
on other platforms, you have to worry about linking libraries, etc ... but
those are app specific issues and not necessarily related to App Engine.

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On Wed, Sep 28, 2011 at 9:56 AM, madmax mahendra0...@gmail.com wrote:

 Hi,
  It looks like I have to move away from app engine if I want to host
 a compiler. I did a thorough search and seems no way I can host a
 compiler on gae  efficiently.
 Sad that I will have to rebuild the website again from scratch to the
 specifications of another infrastructure. Last hope.. Any alternatives
 possible?? Even remote possibilities . Does google provide any
 instances??

   App engine should provide more features to developers to make
 itself as a serious platform for web development.

 Thanks and Regards,
 Mahendra Naik

 On Aug 2, 8:28 am, Robert Kluin robert.kl...@gmail.com wrote:
  Or compilers implemented in Java.  Might be more likely to find those.
 
 
 
 
 
 
 
  On Mon, Aug 1, 2011 at 21:54, Greg g.fawc...@gmail.com wrote:
   You could have another server provide a compile service, and have your
   Appengine app communicate with it via URLfetch, as you suggest. There
   will be inefficiencies here obviously, and you'll have to contend with
   the URLfetch size and time limits.
 
   You could also look for pure python compilers, which could run on
   Appengine.
 
   Cheers
   Greg.
 
   On Jul 31, 10:45 pm, madmax mahendra0...@gmail.com wrote:
   Hi,
 
  I am writing a coding website. I want to provide an option to the
   users to compile their c,c++ or java code. Basically I want to host a
  compilerin my app. Some google links said that it is not possible to
   host an external program on gae. Is there any alternative? Like
   connecting to a Linode or linking to amazon ec2 ??  Any pointers would
   be great.
 
   Thanks and Regards,
   Mahendra Naik
 
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Re: [google-appengine] (Urgent) App upload: Error 400

Hi Amine,

Usually 400 appears when there's a weird thing going on with one of your
.yaml files or if there's a precompilation error. We should have addressed
the second case, however. Is this error still appearing?

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On Tue, Sep 27, 2011 at 2:14 PM, Amine Azariz
amine.aza...@greendizer.comwrote:

 Application: ; version: 2-2
 Host: appengine.google.com

 Starting update of app: , version: 2-2
 Scanning files on local disk.
 Scanned 500 files.
 Cloning 51 static files.
 Cloning 464 application files.
 Cloned 100 files.
 Cloned 200 files.
 Cloned 300 files.
 Cloned 400 files.
 Uploading 2 files and blobs.
 Uploaded 2 files and blobs
 Compilation starting.
 Compilation completed.
 Starting deployment.
 Rolling back the update.
 Error 400: --- begin server output ---

 Client Error (400)
 The request is invalid for an unspecified reason.
 --- end server output ---

 Please let us know what's happening.

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Re: [google-appengine] About the firewall logs

Tsutomu,

Are you asking for logs access? We do not provide access to global request
logs, however, you should be able to download request logs using the
appcfg.py tool. There should be an equivalent comment in appcfg.cmd for
Java.

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On Tue, Sep 27, 2011 at 7:57 PM, Tsutomu Fukumori t.fukum...@anthill.jpwrote:

 Hello,

 I am using app engine.
 Please tell me about Firewall logs.

 1. More than one year, Firewall logs are save?
 2. When problem happened or I want it, Would you please check for
 Firewall logs and tell me survey results?

 Sorry to bother you, but I have an urgent favor that I need to ask you
 to do for me.
 Any help would be greatly appreciated.

 Thanks and Regards,

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Re: [google-appengine] Affiliate Problem

Looks like there's no contact information on the website. We're sorry, but
we cannot provide user details unless there is a specific legal request.

If it's any assurance, it just looks like a standard web proxy (our terms of
service allow proxies).

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On Tue, Sep 27, 2011 at 6:13 AM, Thomas Glössner sea...@2befound.at wrote:

 Hi @ all!

 We got some problems with an affiliate, but we don´t know who it is.

 Our Problem:

 We track all our URL which are coming from outside, so we saw an redirect
 like this:

 http://www.google.com/aclk?1232314934adurl=http://t**racking-solutions.ap
 **pspot.com/x123

 If you click on the URL you will come to www.oursite.com without any id´s
 or something else.

 How can we find out, which person is behind 
 tracking-solutions.appspot.com/x123?

 Thanks for your answers in advance.

 cheers

 Thomas





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Re: [google-appengine] Gurantee log

We don't make guarantees, but so far no one has mentioned missing log
messages except when we have a bug in our logging.

The issue with your plan is that logs are rotated out on a FIFO basis per
log level if you run out of space, so unless you frequently download logs,
you may miss entire blocks of data that will never be recoverable.

It sounds like this is a bit of a hack anyway. Can you describe what you are
doing? Maybe we can come up with a better solution.

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On Tue, Sep 27, 2011 at 2:06 PM, rekby timofey.koo...@gmail.com wrote:

 Do log record gurantee for each request - I want write into log
 instructions for incremental change data and make incremental backup on my
 computer by download  and parse log messages instead of analise datastore.

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Re: [google-appengine] Re: App serving HTTP 500 out of nowhere

Could these be related to datastore latency spikes? Those have been known to
occur regularly on master/slave datastore, and we are encouraging developers
to move to high replication. You can sign up for migration tool access here:

https://docs.google.com/a/google.com/spreadsheet/viewform?authkey=CLXR0LMNformkey=dERMcDZuMnlycHoyZDd4Vy1PNXlhWlE6MQ#gid=0

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On Tue, Sep 27, 2011 at 4:39 AM, Bernd F bernd.fi...@gmail.com wrote:

Tonight it happened again, but after ~1 hour the app recovered on its
own. There must be something wrong with app engine.

On 20 Sep., 00:08, Bernd Final bernd.fi...@gmail.com wrote:
I've had this issue for 5 or 6 times already. My app is running for a
long time and I've had no problems so far, except this one:

Out of nowhere, 20-30 seconds latency and only serving HTTP 500 errors
for 99,9% of all requests. In most Servlets (yeah I'm using Java if
that matters) I'm accessing the memcache, sometimes the datastore
(Master/Slave). As you can imagine the app is totally unusable when
this happens. When it occured the first time I didn't to any special,
just waited for a couple of hours until the app recovered on it's own.

Dashboard Milliseconds/Request Chart:
Yesterday:http://bit.ly/pSF66E
Last 30 Days:http://bit.ly/nYdZ2S

When it happend again and again I tried to figure out what's going on,
luckily I had some kind of Admin-Servlet deployed which allowed me to
clear the entire memcache. Tried it, and voila, everything back to
normal.

- The memcache size was up to 1.3-1.5 MB in total (I did a rough
estimation with the ByteArrayOutputStream trick). 12 Objects are
stored in the memcache. Each Object is POJO which implements
Serializable and contains some Strings, Integers and ArrayLists.
- My first idea was to minimize the memory usage, because I though I
was hitting the 1MB limit. At this time I didn't know the limit is for
each object not for the whole cache, anyway I was able to reduce the
size by 30-40% so the size is now about 800kb - 1MB
- I'm running a cron job which cleans out garbage of the memcache.
- This is how I access the memcache on every request:

CacheManager.getInstance().getCacheFactory().createCache(Collections.emptyMap());
- I'm using put and get Methods for storing / retrieving,
- The key length is about 160 bytes

Unfortunately I was not able to solve this issue yet, I would be very
happy for ANY input.

[google-appengine] Re: Zig zag merge feature request

2011-09-28 Thread jay

Thanks for the reply Jason.

So you are saying that the automatic index creation will simply work
more efficiently now? Is this documented somewhere?

On Sep 27, 1:51 pm, Jason Collins jason.a.coll...@gmail.com wrote:
 Basically, in the past, if you had a query like this:

   query = MyEntity.all().filter('attribute1 =',
 'foo').filter('attribute2 =', 'bar').filter('attribute3 =',
 'baz').order('-attribute4)

 you'd need an index like this:

   - kind: MyEntity
     properties:
     - name: attribute1
     - name: attribute2
     - name: attribute3
     - name: attribute4
       direction: desc

 Call this an optimal index.

 Now, the query engine is able to make due with non-optimal indexes; in
 some cases you may not even need a custom composite index at all.
 Fewer composite indexes means fewer datastore write operations (and
 thus $$), but you will likely trade off performance (and thus
 increased instance-hours, unless you are multi-threaded) as the query
 engine needs to walk through more potential matches when using non-
 optimal indexes.

 A good starting point is to remove all of your indexes from index.yaml
 (on dev, of course!) and see what dev_appserver makes for suggestions.

 j

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Re: [google-appengine] Re: Zig zag merge feature request

2011-09-28 Thread Alfred Fuller

It will only suggest better indexes in some cases (specifically the cases
where the same property was repeated in multiple equality filters, e. g.
WHERE tag=:1 AND tag=:2 ORDER BY date)

On Wed, Sep 28, 2011 at 1:53 PM, jay kyburz@gmail.com wrote:

 Thanks for the reply Jason.

 So you are saying that the automatic index creation will simply work
 more efficiently now? Is this documented somewhere?

 On Sep 27, 1:51 pm, Jason Collins jason.a.coll...@gmail.com wrote:
  Basically, in the past, if you had a query like this:
 
query = MyEntity.all().filter('attribute1 =',
  'foo').filter('attribute2 =', 'bar').filter('attribute3 =',
  'baz').order('-attribute4)
 
  you'd need an index like this:
 
- kind: MyEntity
  properties:
  - name: attribute1
  - name: attribute2
  - name: attribute3
  - name: attribute4
direction: desc
 
  Call this an optimal index.
 
  Now, the query engine is able to make due with non-optimal indexes; in
  some cases you may not even need a custom composite index at all.
  Fewer composite indexes means fewer datastore write operations (and
  thus $$), but you will likely trade off performance (and thus
  increased instance-hours, unless you are multi-threaded) as the query
  engine needs to walk through more potential matches when using non-
  optimal indexes.
 
  A good starting point is to remove all of your indexes from index.yaml
  (on dev, of course!) and see what dev_appserver makes for suggestions.
 
  j

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Re: [google-appengine] Re: like operator in GQL

2011-09-28 Thread Niklas Rosencrantz

If I had to implement something like GQL like I think I would try to build
many queries or a method like GQL IN without the limitations GQL IN has. I
think non-rel db:s handles one problem much better: Everything from a HTTP
request is a string like a parameter representing a boolean value must have
some conversion somewhere and we don't want do to conversion since type
conversion is expensive.

Since Google's environment for app engine is much more integrated than a
traditional SQL system stack you patch together from different
manufacturer, GQL much less has the problem of what or where a boolean
variable is True True and not just 0 or 1 so I have places in my code how
to represent a checkbox without doing any type conversion

if self.request.POST.get('group_article') == '1':
article.group_article = True #checkbox variable

at some other place I also try to represent a boolean variable in a similar
way but it's a onliner:

a.phoneview = self.request.get('phone_hidden', None) is not None
# dummy variable for whether phone number is visible

The later way I don't face the problem what is 1, '1', True etc it just
abstracts away the difference so I should rewrite the first example to be
more like the second
though I don't really understand the part is not None...

Cheers \niklas

On Wed, Sep 28, 2011 at 7:38 PM, roberto.cr roberto...@gmail.com wrote:

 there are many differences between traditional relational databases
 (like mysql) versus non-relational databases, aka nosql (like gae's
 datastore)

 but yes, Full-text search over Datastore is coming really soon

 App Engine Product Roadmap
 http://code.google.com/intl/en/appengine/docs/roadmap.html

 Google I/O 2011: Full Text Search
 Bo Majewski, Ged Ellis
 http://www.youtube.com/watch?v=7B7FyU9wW8Y
 (I recommend everyone here to take a look at it, it's really nice)

 there were 2 main problems when I switched from my traditional mysql-
 thinking to datastore-thinking: geo search and full text search.
 the first is solved using GeoModel (made by some fine Google
 employees), the second will come as a Google solution (see the video).

 so I'm extremelly happy with GAE :) I hope you enjoy it too, Bruce.

 On Sep 28, 10:18 am, Niklas Rosencrantz nikla...@gmail.com wrote:
  These are among the drawbacks, minuses and reasons why app engine should
 be
  cheaper than traditional hosting:
  - no join, no like, no full text search while sql-based system have these
  - extremely difficult to migrate from M/S to HRD while sql-based system
  usually can migrate even large blobs
  - sitemap.xml.gz has no good solution, you have to roll your own whereas
  legacy systems have ready solution to make a sitemap
  - admin console with federated login breaks (other have phpmyadmin or
 tons
  of other solution while I don't have a backup system so my system is not
  real)
  - it's not good but it's the best we got? regards \niklas

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[google-appengine] Re: Gurantee log

2011-09-28 Thread Jan Zawadzki / Hapara

This only works if you don't have a lot of traffic.

As Ikai mentioned, these are limited-size FIFO logs, so if you start
hitting any significant traffic, you will find that your INFO logs
hold a minute's worth of data - longer than a transfer would take you.

Write to a DB, OR, use RPC and URL fetch to ping an external server
that will store the Apache log files for you.

J

On Sep 28, 10:06 am, rekby timofey.koo...@gmail.com wrote:
 Do log record gurantee for each request - I want write into log instructions
 for incremental change data and make incremental backup on my computer by
 download  and parse log messages instead of analise datastore.

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[google-appengine] The Max Idle Instances setting is really lame.

It is not very useful.
When I set it 3, gae will still only keep one idle instances, so my
app will still encounter slow startup when 2 visits coming at the same
time. Setting it higher is helpless to avoid the java app slow startup
problem.

I just found the only difference between set Max Idle Instances as 1
and 3 is the total used CPU hours, about 25:29, which means except the
free 24 hours, the total used CPU hours is 1:5.

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Re: [google-appengine] The Max Idle Instances setting is really lame.

2011-09-28 Thread Barry Hunter

Sounds like you have misunderstood Max Idle Instances. Its the
maximum number you will be charged for. It is not a guarantee. If you
have spiky traffic, it might mean you will have spare capacity ready
to handle more requests. Wont help with the first spike.

Think you looking for Min Idle Instances. That is only available
right now if you have purchased Always On I bleive. Once the new
pricing goes live, it will be open to all.



On Thu, Sep 29, 2011 at 12:07 AM, Tapir tapir@gmail.com wrote:
 It is not very useful.
 When I set it 3, gae will still only keep one idle instances, so my
 app will still encounter slow startup when 2 visits coming at the same
 time. Setting it higher is helpless to avoid the java app slow startup
 problem.

 I just found the only difference between set Max Idle Instances as 1
 and 3 is the total used CPU hours, about 25:29, which means except the
 free 24 hours, the total used CPU hours is 1:5.

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[google-appengine] Re: About the always on feature.

Really don't know how to run a request in backend.
The gae backend doc is not clear on how to invoke url on a specified
backend.

On Sep 28, 5:56 am, Rishi Arora rishi.ar...@ship-rack.com wrote:
 Consider using a backend for cron jobs.  I use my once every hour, and each
 usage lasts about 3 minutes.  This gives me a total backend instance hour
 usage of 18 minutes every hour (15 minutes mandatory idle time charge) =
 18*24 = 7.2 hours, which is under the 9 instance hour free backend quota.







 On Tue, Sep 27, 2011 at 4:29 PM, Tapir tapir@gmail.com wrote:
  Thanks for clarification.

  I think one idle instance is not enough.
  I often (about 15% possibility) load my app page very slowly.
  I think the possible reason is when a visit coming at the same time
  the cron jobs
  is running, a new instance must be started for the visit request.
  As the cron jobs need some seconds to finish.

  So I think it will make a better user experience if gea can provide an
  option to let
  the crons jobs always run in a new separated instance. The new
  separated instance
  will not handle normal visit requests.

  On Sep 28, 4:49 am, Gregory D'alesandre gr...@google.com wrote:
   Agreed.  If you actually need 3 idle instances than it will indeed cost
  you
   that much but for many applications 3 idle instances is overkill,
  especially
   with concurrent requests enabled for java.  Many java apps will be fine
  with
   a single idle instance.  Since you get 28 instance hours/day for free,
  this
   means you can keep 1 idle instance running all the time without an
   additional fee.  Also, the $9 is a minimum spend not a fee (this was
  changed
   from the original model) so it would just be $105.60.

   Greg

   On Tue, Sep 27, 2011 at 1:11 PM, JH ja...@mhztech.com wrote:
yes, under new pricing a min idle instance of 3 will be very
expensive.

On Sep 27, 2:28 pm, Tapir tapir@gmail.com wrote:
 On Sep 28, 3:22 am, Tapir tapir@gmail.com wrote:

  For a java app, to avoid slow warm-up problem, 3 instances are
  needed
  to run always.
  The $9/month always on feature is perfect for avoiding this
  problem.

  In my current understanding, under the new price model,
  the always on feature will cost  $0.08 * ( 24 + 24 - 4) * 30 =

 a spell erro, no * 30 here

  $3.52/day,
  this means for small java apps, if you want to make a good user
  experience
  for your java app, you will pay at least ($105.6 + $9) / per month,
  right?

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[google-appengine] Re: About the always on feature.

In my current understanding, to run a job on a backend,
a http request must be sent from a general front instance to the
backend,
right?

On Sep 28, 5:56 am, Rishi Arora rishi.ar...@ship-rack.com wrote:
 Consider using a backend for cron jobs.  I use my once every hour, and each
 usage lasts about 3 minutes.  This gives me a total backend instance hour
 usage of 18 minutes every hour (15 minutes mandatory idle time charge) =
 18*24 = 7.2 hours, which is under the 9 instance hour free backend quota.







 On Tue, Sep 27, 2011 at 4:29 PM, Tapir tapir@gmail.com wrote:
  Thanks for clarification.

  I think one idle instance is not enough.
  I often (about 15% possibility) load my app page very slowly.
  I think the possible reason is when a visit coming at the same time
  the cron jobs
  is running, a new instance must be started for the visit request.
  As the cron jobs need some seconds to finish.

  So I think it will make a better user experience if gea can provide an
  option to let
  the crons jobs always run in a new separated instance. The new
  separated instance
  will not handle normal visit requests.

  On Sep 28, 4:49 am, Gregory D'alesandre gr...@google.com wrote:
   Agreed.  If you actually need 3 idle instances than it will indeed cost
  you
   that much but for many applications 3 idle instances is overkill,
  especially
   with concurrent requests enabled for java.  Many java apps will be fine
  with
   a single idle instance.  Since you get 28 instance hours/day for free,
  this
   means you can keep 1 idle instance running all the time without an
   additional fee.  Also, the $9 is a minimum spend not a fee (this was
  changed
   from the original model) so it would just be $105.60.

   Greg

   On Tue, Sep 27, 2011 at 1:11 PM, JH ja...@mhztech.com wrote:
yes, under new pricing a min idle instance of 3 will be very
expensive.

On Sep 27, 2:28 pm, Tapir tapir@gmail.com wrote:
 On Sep 28, 3:22 am, Tapir tapir@gmail.com wrote:

  For a java app, to avoid slow warm-up problem, 3 instances are
  needed
  to run always.
  The $9/month always on feature is perfect for avoiding this
  problem.

  In my current understanding, under the new price model,
  the always on feature will cost  $0.08 * ( 24 + 24 - 4) * 30 =

 a spell erro, no * 30 here

  $3.52/day,
  this means for small java apps, if you want to make a good user
  experience
  for your java app, you will pay at least ($105.6 + $9) / per month,
  right?

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[google-appengine] Can I assign the requests with some specified url parterns to always run on a current backend?

in config file?

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[google-appengine] Re: public, dynamic backends are magical (in a good way!!)

2011-09-28 Thread Adam Sah

given the happy vibes, I'll see about posting a series of these.  Let's call 
this post #1 of the series.

cheers,
adam

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[google-appengine] Re: The Max Idle Instances setting is really lame.

ok, then it is really not very helpful for performance,
it is just a way to limit the cost. right?

On Sep 29, 7:14 am, Barry Hunter barrybhun...@gmail.com wrote:
 Sounds like you have misunderstood Max Idle Instances. Its the
 maximum number you will be charged for. It is not a guarantee. If you
 have spiky traffic, it might mean you will have spare capacity ready
 to handle more requests. Wont help with the first spike.

 Think you looking for Min Idle Instances. That is only available
 right now if you have purchased Always On I bleive. Once the new
 pricing goes live, it will be open to all.







 On Thu, Sep 29, 2011 at 12:07 AM, Tapir tapir@gmail.com wrote:
  It is not very useful.
  When I set it 3, gae will still only keep one idle instances, so my
  app will still encounter slow startup when 2 visits coming at the same
  time. Setting it higher is helpless to avoid the java app slow startup
  problem.

  I just found the only difference between set Max Idle Instances as 1
  and 3 is the total used CPU hours, about 25:29, which means except the
  free 24 hours, the total used CPU hours is 1:5.

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[google-appengine] Re: public, dynamic backends are magical (in a good way!!)

why it must be public?
private backends doesn't work?

On Sep 25, 2:23 am, Adam Sah adam@gmail.com wrote:
 hey guys--

 If you're using Tasks and haven't tried public, dynamic Backends yet,
 they're wonderful:
  - for tiny apps, you can offload another $0.72/day for free (they're
 dynamic!)
  - for medium apps, it's a super easy way to get more RAM
  - easy migration from Tasks running on frontends to running them on
 public, dynamic backends (incl development, debugging, etc.)
  - nearly identical debugging/production methods as frontend Tasks
  - since they're public, you can launch Tasks directly on the backend,
 removing the frontend from the equation, e.g. you can test out how a
 Task will perform on a backend, before committing to the architecture
 change.
  - cool trick: keep the fast Tasks running on frontends, and use the
 (expensive) backends for RAM-intensive jobs-- this is a tiny code
 change, and also makes it easier to debug large jobs because the
 console isn't flooded with little jobs.  For my app, I use Tasks for
 various indexing jobs in an online marketplace-- now, I send the
 large sellers with 1000s of SKUs, to a B4 backend.

 GAE team:
  - I've noticed that my backends can 500-error but not produce a stack
 trace in the logs?  are other people seeing this?

 my choice of migration: (python)

 1. create backends.xml, define *one* backend, e.g.
     backends:
      - name: backend2647324    # since it's public, give it a hard-to-
 guess name
        class: B4            # big+fast without blowing the free budget
        options: dynamic, public

 2. add backend-enabled queued, by copying queues from frontends:

    queue:
     - name: image-processor
       ...other options here...

     - name: image-processor-backend     # note how I append -backend
 to the name
       target: backend2647324
       ...other options here...

 3. in your code, start firing Tasks at the backend

     # see bottom for taskname() trick
     taskqueue.add(url=..., name=taskname(some-identifier-i-will-
 recognize),
         queue_name=image-thumbnailer+(-backend if
 is_gigantic_image(...) else ))

 4. modify your deploy script to update both the front  backends.
 Mine (legacy) is in perl:

 # deploy bar   == deploys to foo-bar and to foo-bar-backend
 # deploy bar-backend   == deploys to foo-bar-backend only
 # deploy bar-frontend   == deploys to foo-bar only
 $DEST = pop(@ARGV);
 my $push_frontend = 1;
 if ($DEST =~ s/-backend//) { $push_frontend = 0; }
 my $push_backend = 1;
 if ($DEST =~ s/-frontend//) { $push_backend = 0; }
 if ($push_frontend) {
   open(FH, echo .$ENV{GAEPASSWD}.|python2.5 .$ENV{GAEDIR}./
 appcfg.py --email=.$ENV{GAEUSER}. --passin --application=foo-$DEST
 update .|);
   while (FH) { print; }
   close FH;}

 if ($push_backend) {
   open(FH, echo .$ENV{GAEPASSWD}.|python2.5 .$ENV{GAEDIR}./
 appcfg.py --email=.$ENV{GAEUSER}. --passin --application=foo-$DEST
 backends . update|);
   while (FH) { print; }
   close FH;

 }

 that's it!  now, some jobs will go to the frontends and others to the
 backends.

 hope this helps,
 adam

 def taskname(string):
   safely create Google App Engine Task names.
   # add timestamp and random for ultimate uniqueness, strip disallowed
 chars
   rnd_salt = str(random.randint(10, 99))
   return re.sub(r'[^a-zA-Z0-9-]', '-', string +
 str(datetime.datetime.now())) + - + rnd_salt

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[google-appengine] Re: Can I assign the requests with some specified url parterns to always run on a current backend?