Hi,
I do personally scan each entity type via an ad hoc request and store
each instance as entry in an xml file stored in the blobstore.
You can then externalize it via download from another machine.
Another possible way is to store you data on Amazon S3: you can then
also store them 1 by 1 if
Hi,
You could try (didn't do it myself) the load-on-startup param with a
value 0 in the servlet definition of a given servlet within
web.xml
This starts the servlet when the application is deployed in starting
container.
That should allow you to do what you want
regards
didier
On Sep 13,
Hi,
The survival of content of memcache is not garanteed by the specs of
GAE: it can disappear at any time.
Those specs say: However, when considering whether to store a value
solely in the memcache and not backed by other persistent storage, be
sure that your application behaves acceptably when
If you don't want to introduce MapReduce solely for this purpose, you
can write a queued task that loops through the data to delete it
and that recreates a new instance of itself just before time limit (10
min) to continue the deletion.
regards
didier
On Sep 9, 8:37 pm, Marcelo Liberato
Hi,
Another way to do it is to use the spreadsheet api of Google Docs and
send your users there (they can retrieve the web spreadsheet as a file
if needed)
See http://code.google.com/apis/spreadsheets/
regards
didier
On Sep 5, 7:57 pm, Marcelo Liberato mliber...@gmail.com wrote:
You should
Hi,
Yes, for such a task you will have to go via the Task Queue: an
interactive task of this size would for sure reach the allowed limits.
The way it works is : read an entity, do the updates, check the
duration since start, if far from limit process another entity, if
close to limit, reschedule
Hi,
have a look at this:
http://code.google.com/appengine/articles/sharding_counters.html
regards
didier
On Jul 22, 9:45 pm, katy ktu...@gmail.com wrote:
Im trying to get a kind of auto increment number for an entity. I all
ready create a counter class to take a track of the quantity of
Hi,
Did you properly set up auths for access to static content
See
http://code.google.com/appengine/docs/java/config/appconfig.html#Static_Files_and_Resource_Files
regards
didier
On Jul 18, 9:37 pm, bb bayc...@gmail.com wrote:
Hello,
I have a static XML file in my App Engine app that
On Jul 19, 10:53 am, Simon Knott knott.si...@gmail.com wrote:
Oops, read that link without any coffee! It obviously states that you
*can*use the FileInputStream class - have you tried dropping the war bit off
your filepath?
--
You received this message because you are subscribed to the
Hi,
Then, you should open an issue to get it fixed
regards
didier
On Jul 19, 11:24 pm, Zhenyu wingzer...@gmail.com wrote:
Hi Didier,
It is PNG.
You can change any other PNG images to test.
GAE can NOT handle transparent when convert PNG to JPEG.
Regards,
On Jul 18, 6:34 pm, Didier
Hi,
J. Smarr, tech lead for G+, says: Our backends are built mostly on
top of BigTable and Colossus/GFS in this short description of Google+
insfrastructure:
http://www.quora.com/Can-someone-provide-some-information-about-Google+-infrastructure-architecture.
regards
didier
On Jul 19, 6:57
Hi,
Have a look at this to understand the issues:
http://blog.notdot.net/2009/9/Distributed-Transactions-on-App-Engine
regards
didier
On Jul 10, 11:09 pm, mscwd01 mscw...@gmail.com wrote:
Hey
I'm using JDO and need to update two entities both of which reside in
their own entity group. As I
Hi,
If you look at the recent recommandations of Google, the 1st best
practice is probably to move away from JDO and go to either low-level
API or some 3rd party package like Objectify (my choice) to give you
good long-term perspectives.
regards
didier
On Jun 24, 9:47 am, Martin Newstead
Hi Toby,
The (new) capabilities API should help:
http://code.google.com/appengine/docs/java/capabilities/overview.html
regards
didier
On Jun 23, 8:39 am, Toby toby.ro...@gmail.com wrote:
Hi,
I do frequently experience some problems with my app. Errors going up
or an unusual traffic load or
on the dashboard (load, quota, requests with the most errors
etc.).
Cheers,
Toby
On Jun 23, 12:15 pm, Didier Durand durand.did...@gmail.com wrote:
Hi Toby,
The (new) capabilities API should
help:http://code.google.com/appengine/docs/java/capabilities/overview.html
regards
didier
On Jun 23
Hi,
Why would you do such a thing: if you don't want the indexes anymore,
you deleted them. When you need them again in the future, you just
rebuild them: the entities present in your datastore will redefine the
new index entries.
Indexes are anyway not accessible as such but if they were, it
Hi,
Don't you have some datastore entities that are used in every request
or so? Let's say a global counter of requests or sthg equivalent.
That entity would be updated in every request, hence the contentions
as you trafic raises.
regards
ddoer
On Jun 22, 11:59 pm, mscwd01 mscw...@gmail.com
Hi,
If switching storing api is your way to go, also give a try to
Objectify.
regards
didier
On Jun 21, 3:24 am, J.Ganesan j.gane...@datastoregwt.com wrote:
DataStoreGwt provides an alternative to JPA itself. Please see whether
it suits your project.
J.Ganesanwww.DataStoreGwt.com
On Jun
Hi,
you have a couple of things to do:
a) load your code in the new domain
b) transfer data from the datastore of appspot.com to datastore of
your new domaine
c) set a redirect from pages in appspot.com to your new domain.
When you see no more trafic on appspot.com acccount, you can then
close
Hi,
Memcache on GAE is based on JSR-107: see http://jcp.org/en/jsr/detail?id=107
The purpose of jsr 107 is Specifies API and semantics for temporary,
in memory caching of Java objects, including object creation, shared
access, spooling, invalidation, and consistency across JVMs
So, memcache is
Hi,
Why don't you just update() with the appropriate setPolicy() or delete
your items in the memcache when no longer needed ?
See and
http://code.google.com/appengine/docs/java/memcache/usingjcache.html#Configuring_the_Set_Policy
and
Hi,
Shape is not in the white list: all the classes part of it are
detailed here http://code.google.com/appengine/docs/java/jrewhitelist.html
regards
didier
On Jun 13, 4:27 am, Dieter Krachtus dieter.krach...@googlemail.com
wrote:
Hi,
I am relatively new to Java appengine but I can imagine
Hi,
As the message says: you can't touch objects in more than 1 group in a
single transaction.
If it suits your needs you can put all the children of a Parent in a
single entity group defined by the Parent instance: see
The data viewer is accessible from the management console in your
account: you can see what's in your datastore in all details.
regards
didier
On Jun 10, 5:12 am, Nathan Stiles stiles.nat...@gmail.com wrote:
What is this DataViewer? How do I use this? Eclipse?
--
You received this message
Hi,
Check in the version management of the console how many versions of
your app still known by gae. More than 1 ?
regards
didier
On Jun 5, 10:07 am, Desarrollo VDK Guatemala devd...@gmail.com
wrote:
Yep, I'm using a totally new version
--
You received this message because you are
Hi,
yes, that should do the job.
regards
didier
On Jun 3, 8:13 am, meiaestro jmalbre...@gmx.de wrote:
Hi!
Thanks a lot for the helpful hints! Now let me see if I got it right. In my
case I only have the entry point starting page. Within this class I have
three methods building three
Hi,
As a workaround, why don't you delete each entity in the set in a loop
by yourself before deleting the entity which the set is part of ?
regards
didier
On Jun 6, 1:48 am, mscwd01 mscw...@gmail.com wrote:
Hey,
I have a parent entity which has a Set of child entities, as
follows:
class
Hi,
Did you specifically read
http://code.google.com/appengine/docs/java/tools/localunittesting.html#Writing_Task_Queue_Tests
for local tests
Via the provided sample, you can access the scheduling params of your
task
regards
didier
On Jun 2, 2:04 pm, ramesh chiluverirame...@gmail.com wrote:
Hi,
Did you check the source code at
http://appengine-mapreduce.googlecode.com/svn/trunk/java/src/com/google/appengine/tools/mapreduce/AppEngineJobContext.java
the comments at the point where exception is thron may help you
understand why you get it
regards
didier
On Jun 2, 7:00 pm, Santosh
Hi,
the beauty (or the horror...) of Java apps with GWT is that you can
stay alway in the same page: so, you don't need multiple urls with
redirects between them by any mean.
You can just programmatically decide in the java code of your unique
servlet which content you decide to put on the page.
Hi,
entity group is not useful at rollback but rather limits you to which
updates you can do: all the entities you touch in a single transaction
must be in the same entity group.
So, designing your groups properly is a key design issue in GAE to
avoid unnecessary complexity when you later need
Hi,
It seems that the character at index 58 in your request is wrong
Did you check this char in your url ? (I assume that you do a http get
and not a http post)
What is this char ?
regards
didier
On May 20, 12:24 am, yousefgh fe...@yousefgh.com wrote:
Could it be the length? because it is
Hi,
to my knowledge, app engine doesn't store used namespaces, it just
uses the corresponding string as prefix to separate data structure.
If you want to remember all used namespaces, it's something that you
have to handle by yourself: you create your system namespace then
define an entity for
HI,
From the description of your needs, it seems that the Java inheritance
mechanism is all what you need.
Yours servlets should all inherit from HomeServlet, in their doGet()
method, they will just call super.doGet() at the beginning and then
execute their own thing.
regards
didier
On May
Hi,
Look at
http://groups.google.com/group/google-appengine-java/browse_thread/thread/f6f40411a076aa30/1b0f2adb19ce0997?lnk=gstq=Failed+calling+setMethod+method+#1b0f2adb19ce0997
At the very bottom, you may have the answer to you question
regards
didier
On May 14, 11:25 am, Daniel
Hi,
Did you follow the guidelines of
http://code.google.com/appengine/docs/java/tools/localunittesting.html
?
regards
didier
On Apr 25, 11:13 pm, Amar Z amarzumkhaw...@gmail.com wrote:
Hi,
I am developing a new application and need help utilizing task queues.
Here is the problem: when I
Hi,
Don't know if what you do is possible but why don't you just obtain
the data that you need from the other application via simple requests
to servlets delivering the needed data.
By using Java standard object serialization, you can achieve what you
need whatever the object class via a unique
Hi,
Do you have the issue on your dev machine or on productive
infrastructure: I remember having issues with PNGs on my dev machine
but that would work ok on live machines
regards
didier
On May 12, 8:27 pm, Teng Shiu Huang small...@gmail.com wrote:
I am evaluating
Hi,
1 of the reasons is that all applications don't run all at the same
version on the gae productive infrastructure. So, google would have to
know which one you are using in order to put it for you in your war
when you upload it. It's probably simpler to handle if the developper
puts the jars at
Hi,
this question should be posted in the Objectify group and not in this
one.
It works in A for B because A is a parent of B so you can search with
for B instances having an A instance as ancestor.
For the others, it doesn't work: an A is not ancestor of a C so it
can't work. It could work for
Hi,
You syntax seems correct: so you're right, probably a bug.
But, at least, you may check the date in your job and if not 1st of
month then you can just exit. So, it still get scheduled every day but
at least works only on the 1st.
regards
didier
On May 9, 7:52 pm, Vik vik@gmail.com
Hi,
I checked: newSetFromMap() method appears in jre 6: see the javadoc of
jre 5.0 where it is not present at
http://cupi2.uniandes.edu.co/web/javadoc/j2se/1.5.0/docs/api/java/util/Collections.html
So, you must upgrade your jre to v6 for your code to work.
regards
didier
On May 7, 9:06 pm,
Hi,
You have a ClassNotFoundException on a Xerces class according to your
dump: so you are not using the basic xml classes to parse your xml but
also xerces.
You should add the xerces jar in you lib directory
regards
didier
On May 5, 6:16 pm, Richie richiejr...@gmail.com wrote:
Hey guys,
I
Hi,
To get the page, do you use the specific URL Fetch service that is
part of the gae sdk ?
See http://code.google.com/appengine/docs/java/urlfetch/overview.html
If not, may be the source of your issue.
regards
didier
On May 5, 1:22 pm, Luke Waldron therabidw...@gmail.com wrote:
I have
Hi,
An answer from google is needed as Runtime still is in the whitelist:
http://code.google.com/appengine/docs/java/jrewhitelist.html
So, it should provide all the methods of the regular jre class.
regards
didier
On May 4, 4:40 am, emurmur emur...@conceptuamath.com wrote:
My app started
Hi,
It may be only a partial response to your needs but at least you can
use AppStats (http://code.google.com/appengine/docs/java/tools/
appstats.html) to get a programmatic view of the health of your
application
regards
didier
On Apr 30, 8:02 am, uronn oukin...@gmail.com wrote:
Hi,
You can't multithead directly in GAE: it's forbidden.
You rather gain parallelism via queued tasks.
You don't really care in the servers are multi-core or not: gae starts
more jvms automatically when needed.
regards
didier
On Apr 30, 6:14 pm, hadf hadrien.for...@gmail.com wrote:
Hello,
Hi Luca,
Would also advise you to read the book Programming Google App Engine
by Dan Sanderson (Google engineer) full of technical stuff that you
will not find elsewhere on the net.
regards
didier
On May 1, 12:26 am, Brandon Donnelson branflake2...@gmail.com wrote:
Hi Andy,
My suggestion - if you're reluctant to use a 3rd party package - is at
least to read their source code (they are open source) to see how they
proceed to achieve what you want, which is also what they do.
I read most of Objectify: not that long - approx 10K lines.
Definitely a must read
Hi,
You should also submit this in the Objectify group
regards
didier
On Apr 21, 5:30 pm, Simon Knott knott.si...@gmail.com wrote:
Hi,
What version of the SDK are you using? The increase to the time allocated
for backgrounds tasks only took place in v1.4 onwards. Also, there was a
bug
Hi,
Did you try to bring the jar containing those annotations over to
Android and then make it an Android dex file,
If android sdk accepts to dex it, that may be good enough
Let us know if this works else I may have another less direct solution
regards
didier
On Apr 21, 4:39 pm, cghersi
Hi Andy,
Why don't you try a 3rd party package with an intermediate level of
abstraction: they enforce types.
See Google recommandations at
http://code.google.com/appengine/docs/java/datastore/overview.html#Introducing_the_Java_Datastore
I personally use Objectify.
regards
didier
On Apr 22,
Hi Ram,
The web is full of good tutorials for the subjects that you want to
learn: use google to find some.
Please, understand that this group is not a place for all what
concerns Jav dev: far too broad...
regards
didier
On Apr 19, 7:56 am, Ram ram...@gmail.com wrote:
Please anybody reply...
Hi,
Read this part of app engine doc:
http://code.google.com/appengine/docs/java/urlfetch/overview.html
You will see that there are some restrictions in the URL service: port
numbers, etc...
Maybe you will into one of them with c2dm
regards
didier
On Apr 15, 1:37 pm, Thomas Riley
Hi,
Be careful with the cron job: you may lose some of your updates if gae
has some trouble between some updates and the cron job. There is no
guarantee from Google on that point:
see Under rare circumstances, values may also disappear from the
cache prior to expiration for reasons other than
Hi,
Are you using eclipse ? if yes check under File Properties Text
File encoding that your file is UTF-8 encoding.
I would guess not.
So, change it to UTF-8 and your issue should get fixed.
regards
didier
On Apr 19, 6:32 pm, Luca Matteis lmatt...@gmail.com wrote:
I posted a question on
Hi,
You should have your own implementation of the class Servlet
Then, you should derive all your own servlets from this child of
Servlet
So, when a call a made to your central server is made, this child of
Servlet will be instantied and you can get which url was called, the
input parameters,
Hi,
yes, you can.
If you use Google Webtoolkit, the simplest way is to use the Java api
for GWT at http://code.google.com/p/gwt-google-apis/
else, you have to generate your html via java to respect the google
maps api requirements: script line, etc.
regards
didier
On Apr 18, 8:44 am, Ram
Hi,
If you don't use memcache, it means that you do your reads from
datastore, so you incur the delay of accessing a remote datastore
server and then the delay of its disk access time.
Memcache is direct access memory so much faster!
You see most of the benefits if you can use memcache for
Hi,
You should use an enum class for the properties (so that you can
extend later on) and store them as proposed above in a Set
regards
didier
On Apr 10, 8:29 am, Ravi Sharma ping2r...@gmail.com wrote:
May be you can do womething like this
class HouseProperty{
Key id;
String Name;}
in
Hi,
You should clarify what you mean by an open session: do you mean the
http one defined by the cookie, the security one after login, etc ?
regards
didier
On Apr 10, 9:35 am, Max thebb...@gmail.com wrote:
have you tried to use memcache or simply store session into datastore?
--
You
Hi,
I guess that you just have to
- select how you access the Datastore (JDO/JPA or low-level API
or 3rd party package like Objectify)
- make an annotated entity Counter with the 2 fields above
- code the algo as you say above
- you may want to put this code in a task
Hi,
You should try querying them all (so that you don't have to create an
invalid query) via a Java program and then check the value of the
property once the object is instantiated in order to issue a delete if
the prop value is wrong.
You may have to do this via chained queued tasks if your
Hi,
You get the key of your blob via BlobKey blobKey = blobs.get(myFile)
(see http://code.google.com/appengine/docs/java/blobstore/overview.html)
So, I would personally store all the myFile ids that I distributed
from the server side and in an asynchronous queue task would do to see
if the get()
Hi,
You can simply post (http POST request) and get (http GET request)
from your client which can then be a very simple batch java program.
You do those http requests on the url of your servlet.
That's the simples way I know.
regards
didier
On Apr 5, 3:18 pm, jake189 binhmin...@gmail.com
Hi,
Having a version (or even better a timestamp) for last update is also
what I use to maintain integrity of my data.
To manage it simply,
a) I use a hierarchy of object all inheriting from a DsObject so that
I to manage this version only in one place
b) I use the @PrePersist annotation (from
Hi,
Also think about Google Web Toolkit for the UI: you will remain so
full-Java and you can do nice interface even if you are as bad as I am
in graphics / ui design ;-)
I agree with Simon: definitely forget JPA/JDO! (I went with
Objectify)
Also study carefully the datastore, especially entity
for your app!
didier
On Apr 1, 5:30 pm, Didier Durand durand.did...@gmail.com wrote:
Hi,
Also think about Google Web Toolkit for the UI: you will remain so
full-Java and you can do nice interface even if you are as bad as I am
in graphics / ui design ;-)
I agree with Simon: definitely forget
Hi,
The simplest way is to write a servlet on GAE.
When your own server is done with the calculation, it posts (http
POST) the new data to this servlet who reads it and separate each line
as a new entity in the datastore.
The servlet can then do further processing (cleanup, updates, etc.) if
Hi,
You should also consider 3rd party packages like Objectify who works
at an intermediate level of abstraction.
The low-level api forces you to handle everything by yourself: the
Entity, its Properties, etc...
In JPA, JDO: you work much higher in abstraction: you define a Java
class as an
Hi,
Yes, you can run your tests on the GAE server itself and it's very
useful to dig out the last errors that the run on the dev server
didn't show. It saved me days.
For that, you have to write you own Junit TesRunner as as servlet: you
can start simply by using the TextRunner of Junit and
The consequence of what Simon says is that you have to be prepared to
have a separate init for each jvm and this can cause issue if your
application relies on the semantics of a single init (singleton,
etc..)
regards
didier
On Mar 31, 1:55 pm, Simon Knott knott.si...@gmail.com wrote:
Static
Hi,
I have successfully used ThreadLocal on GAE to define some variables
specific to a given transaction represented by its thread. I wanted
theses variables to be shared by various subservices in my
transaction. So, it's very close to what you tried to achieve.
Then, you should be ok using it.
Hi,
Vaadin is also a possible good choice in addition to ext-gwt
regards
didier
On Mar 28, 1:04 pm, Thierry Lejealle thierry.lejea...@gmail.com
wrote:
Hello,
I find GWT standard components a bit dull. What would you recommand to
extends GWT components and still remain compatible with App
Hi,
Check the metadata queries: exactly what you need
http://code.google.com/appengine/docs/java/datastore/metadataqueries.html
regards
didier
On Mar 28, 4:53 am, Arjun Jain arjun.j...@gmail.com wrote:
How to check table exists or not or how to display all table
--
You received this
Hi,
It's depending on certain values in the header of the request: see
http://code.google.com/appengine/docs/java/runtime.html#Responses
regards
didier
On Mar 24, 11:46 am, pac parvez.chau...@gmail.com wrote:
It looks that app engine is not serving compressed contents.
Is there something I
Hi,
For me, the answer is here:
http://code.google.com/appengine/docs/java/datastore/transactions.html#Isolation_and_Consistency
They say: Queries and gets inside a transaction are guaranteed to see
a single, consistent snapshot of the datastore as of the beginning of
the transaction. In
Hi,
The invitation you send from the GAE dashboard is not about source
code sharing but about giving the other person access to this
dashboard so that he can also see logs and administer app.
For code sharing, you have to use Github (if your project is open) or
go a hosted subversion service.
Hi,
There is a difference:
a) the build path is what's needed to compile your source as you code
it
b) the classpath is what's needed to run the application
The local jars provide low-level service used by the jars facing the
user code and replace equivalent jars of the prod env.
So, you don't
Hi,
You don't need to explicitely use the parent filter in you query as
long as all entities effectively are in the same group.
The need for that is to isolate all entities potentially updated by a
transaction on a single store server, i.e the one hosting the entity
group.
regards
didier
On
Hi,
You will be ok if you add not only 1 single gae jar (appengine-tools-
api.jar) but all those (about 2) appearing in the GAE sdk library on
Eclipse when you create a new project + those needed to run locally.
The simplest way for you is to follow he hints given in
Hi,
namespaces are not related to entity groups: entity group is a notion
to group entities for transactional purposes. The aim is to limit a
transaction to update of objects in a single group (i.e on the same
server) to get a higher reliability and good scalability.
The namespace is a just a
Hi,
In order to achieve your goal is the quota limit cannot be changed,
may I suggest though that you still update your file to the datastore
to serve them back to your clients.
You would not serve them from datastore but upload them into memcache
(all at startup or 1 by 1 on 1st use) and serve
into the main memory and loading the records into the memory
cache. An other question is, both of the two approaches will consume a lot
of time, but the performance of the former is still questionable.
Expecting your further directions. Thanks for your attention!
Chun
2011/3/16 Didier Durand durand.did
Developer Programs Engineer, Google App Engine
Blog:http://googleappengine.blogspot.com
Twitter:http://twitter.com/app_engine
Reddit:http://www.reddit.com/r/appengine
On Wed, Mar 16, 2011 at 10:13 AM, Didier Durand
durand.did...@gmail.comwrote:
Hi, this question was already debated
Hi,
see
http://groups.google.com/group/google-appengine-java/browse_thread/thread/ef090c0e6ea4a6d6/649797c2b590f672?lnk=gstq=framework+ikai#649797c2b590f672
tons of suggestions
regards
didier
On Mar 15, 6:07 pm, Jay Young jayyoung9...@gmail.com wrote:
Hi,
Jersey is supposed to work officially on app engine: see
http://groups.google.com/group/google-appengine-java/web/will-it-play-in-app-engine
May the associated how-to will help you fix your issue:
http://tugdualgrall.blogspot.com/2010/02/create-and-deploy-jax-rs-rest-service.html
regards
Hi,
please provide the stack trace of your exception
regards
didier
On Mar 14, 2:04 am, Miguel Angel De la Torre Martínez
mdelatorr...@gmail.com wrote:
Hello
I'm new to the Blobstore so please help.
I'm trying to use a really standard GWT RPC like this:
public String
Hi,
Are you using queued tasks ? This can of error may appear then.
It appears on the dev server when the Task Queue env in not correctly
started.
regards
didier
On Mar 12, 8:03 am, dalchand choudhary dc4...@gmail.com wrote:
Hi,
I am using App Engine Locally with eclipse and while
, Mar 12, 2011 at 3:55 PM, Didier Durand durand.did...@gmail.comwrote:
Hi,
Are you using queued tasks ? This can of error may appear then.
It appears on the dev server when the Task Queue env in not correctly
started.
regards
didier
On Mar 12, 8:03 am, dalchand choudhary dc4
Hi,
You're right: you can't control WHAT (size, etc...) the users upload
but you can control IF they upload: the key after /upload is generated
by App Engine and has to be a valid one (not too old, not used yet,
etc,,) to be usable for an update.
If you generate such an upload for authentified
you're saying I should only generate the upload key url if the
user is authenticated?
And that would make it secure? avoid spam and such?
On Fri, Mar 11, 2011 at 12:32 PM, Didier Durand durand.did...@gmail.com
wrote:
Hi,
You're right: you can't control WHAT (size, etc...) the users upload
Hi Luca,
1 thing before going in the new code: by using the blobs in datastore,
the interactive time limit (30s) apply (it does not for the blobstore)
I.e., the upload must be finished in 30s after that request is
cancelled by gae.
It may be harder to achieve even if your image is 1Mb if the
Hi,
You should give a try to packages like Objectify (recommended by
Google also: they tend to push people away from JDO / JPA...)
It is simpler to learn than JDO and much more efficient in terms or
performance.
I abandonned JDO for Objectify many months ago and I am extremely
happy about that
Hello,
The jvm implementation of GAE is not complete either: see this list to
see which classes are usable or not.
http://code.google.com/appengine/docs/java/jrewhitelist.html
regards
didier
On Mar 10, 7:50 pm, Damien Dessagne damien.dessa...@gmail.com wrote:
I ran into the same problem
) {
this.geoBoxL5 = geoBoxL5;
}
}
On Mar 7, 10:23 am, Didier Durand durand.did...@gmail.com wrote: Hi,
Could you please disclose the source code of your objects stored in
the ds ?
You maybe right or wrong depending on how they were defined.
regards
didier
Hi,
Even if you solve the File I/O issue, I would guess that you may then
face security issue: Google has probably protected its instances
against execution of code not coming direcly from the war file...
Anyway, very interesting question: pls, let us konw how you progress.
regards
didier
On
empty. Through debugging I have been able to isolate that it's the
bottleneck is pm.makeConsistent of each entity to insert. Wouldn't having
indexes make the inserting even slower (since these indexes have to be
updated/rebuilt)?
thanks
C.
On Mon, Mar 7, 2011 at 5:44 AM, Didier Durand
Hi,
I have a personal rule of thumb of 10 udpated entities / second [Ds is
made for heavy read throughput but is not so fast on writes]
The new High Replication datastore seems (not tried it personally...)
slower: 1 update per second is what is the max recommended. See
My 2 cents:
- queues scale up very well: I tried them with no throttle (on bucket
size) and you easily get 12-15 jvm running your computations. To my
knowledge, queues are the best way to get parallelism on GAE.
but
- data access / contention may be the issue: don't you write anything
back ? That
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