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  • Google App Engine: How to be notified when APIs change or become available?

    - by herpylderp
    I am thinking about writing a GAE app but am a little hesitant because the EULA gives Google full rights to change their APIs anytime they want, for any reason. Obviously, they'd be out of business quick if they just 'upped and refactored their entire APIs, so I have to imagine they have some kind of notification system, perhaps even an RSS feed, etc. to notify developers well in advance of looming changes, or new features coming out in future releases. However, for the life of me I can't seem to find any trace of the existence of such a notification system. Perhaps the Google forums is the only place to get such updates? I guess I'm asking any battle-worn GAE veterans for re-assurance that there are reliable ways of getting notifications about policy or API changes from Google such that I could react and make the necessary app changes without production breaking or impacting any clients. Thanks in advance!

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  • App Engine charges in November 2011 [closed]

    - by broiyan
    I had a billing enabled test application on Google App Engine left over from early 2011. I have not received a bill in many months because I have not been hitting the URL and according to the activity monitor, nobody has. Then unexpectedly in November 2011, I received 2 bills in as many weeks for quite minimal amounts. Checking the monitor it looks like nobody has been hitting the URL and according to the SQL-like search, there is nothing in the Datastore. I know that GAE has left the "preview" in recent weeks but I am not sure how that would affect what is essentially a dormant application with no Datastore objects. Has GAE started charging for completely unused applications in recent weeks? Edit: Most of my applications were already disabled and I have just disabled the only one that was enabled but unused the past several months. If I get another bill next week that should be informative.

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  • Legality of modifying and distributing the JRE

    - by herpylderp
    I see that Google App Engine apps run on a so-called secured sandbox JRE; that is, a JRE that Google modified and that makes changes to certain JRE types. This is how GAE prevents developers from writing apps that can do things like: Access the local file system via File Make remote JDBC calls Use JNDI Lots of other restrictions We have a similar need where we have an app that developers will be able to write plugins for. These plugins will need to utilize an API (a JAR) that we distribute with our app. We cannot afford for plugins to do certain things, particularly on the end user's file system, and need to modify the File class in a similar manner that GAE does. Long back-story short, this means we'll need to ship our app with a custom, modified JRE. My question: is this legal to do, or did Google likely pay Oracle some fee to modify/distribute their own JRE for app engine?

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  • LUNs disappear after rebooting the ESX/ESXi host

    - by mariolos
    A single LUN among from a group disappeared. Neither the host nor the Vcenter can see it. Four virtual machines on the LUN now are unknown. The strange thing is the LUN is now available in the list when you try to ADD datastore from configuration == storage == Add Datastore But this cannot help me since i need the vms on the lun and i do not get options to add the lun without formating it to VMFS How can i get the lun back or atleast be able to copy the vms from it

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  • App engine downtime

    - by DutrowLLC
    I've noticed that google app engine seems to have a fair amount of downtime where they place the datastore into read-only mode. Frequently this downtime is in the middle of the day. Is this something that is happening only during early development, or is this something that I can expect to be always be occurring? I've developing an application that helps small businesses handle their operations. One thing that it does is take appointments, another is route phone calls. I'd like some suggestions on how to handle times when the datastore is in read-only such as: What if our client is on the phone with the customer and is taking down an appointment and the datastore is in read-only? It would not be acceptable to ask the client to come back later to save, especially if its in the middle of the day. What if there is an incoming call and the application can not store the record or properly route the call due to database writes being unavailable? How are these types of issues normally handled?

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  • Django ModelFormSet with Google app engine

    - by Eric
    I'm using Django with google app engine. I'm using the google furnished django app engine helper project. I'm attempting to create a Django modelformset like this: #MyModel inherits from BaseModel MyFormSet = modelformset_factory(models.MyModel) However, it's failing with this error: 'ModelOptions' object has no attribute 'fields' Apparently modelformset_factory() is expecting MyModel to implement a 'fields' accessor. Anybody successfully used a modelformset with GAE datastore? Or is this a fundamental incompatibility between Django and GAE?

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  • how to send sms from web app with twilio in java

    - by user2614804
    Hi I'm new to Twilio and want to know how How to send an SMS from a GAE web app with Twilio using JAVA ? I've executed the example on their website as Java app and it works. https://www.twilio.com/docs/quickstart/java/sms/sending-via-rest When I want to make the same in a Java Google App Engine app, it don't and it display a message ("The method GET is not supported") Can someone share a step by step tutorial on how to make my Java GAE webb app to send SMSes please ? Thanks

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  • Are people really using Google App Engine, or they are just playing with it because "the cloud is co

    - by Bozho
    Since there are 1500+ questions for google-app-engine, I was wondering: what are people actually using it for? are they doing something for their companies or startups? are they just playing around with it because "the cloud is cool"? are they using it because it's the "java free hosting"? (answers from actual GAE users are preferable, but logical assumptions from others are welcome) Update: I was asking (as tagged) about the Java aspect of GAE.

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  • Google App Engine + AWS S3 file protection!

    - by grep
    Hi all, I have an application running on GAE/J that streams video from AWS S3. I need a solution for protecting the video from being stolen and I found that pre-signed URLs might be it (??). How can I create pre-signed URLs from GAE/J or there's a better solution to secure the videos? thanks

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  • What is a good design pattern and terminology for decoupling output?

    - by User
    I have a program where I want to save some data record. And I want the output type to be flexible such that I could save the data record to a text file, xml file, database, push to a webservice. My take on it would be to create an interface such as DataStore with a Save() method, and the concrete subclasses such as TextFileDataStore, DatabaseDataStore, etc. What is the proper name/terminology for this type of pattern (I'm using the term "DataStore", log4net names things "appenders", .net they talk about "providers" and "persistence")? I want to come up with good class names (and method names) that fit with a convention if there is one. can you point me to a decent example, preferably in C#, C++, or java? Update Managed to find this stack overflow question, Object persistence terminology: 'repository' vs. 'store' vs. 'context' vs. 'retriever' vs. (…), which captures the terminology part of my question pretty well although there's not a decent answer yet.

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  • Access Token Verification

    - by DecafCoder
    I have spent quite a few days reading up on Oauth and token based security measures for REST API's and I am currently looking at implementing an Oauth based authentication approach almost exactly like the one described in this post (OAuth alternative for a 2 party system). From what I understand, the token is to be verified upon each request to the resource server. This means the resource server would need to retrieve the token from a datastore to verify the clients token. Given this would have to happen upon every request I am concerned about the speed implications of hitting a datastore like MySQL or NoSQL upon every request just to verify the token. Is this the standard way to verify tokens by having them stored in a RDBMS or NoSQL database and retrieved upon each request? Or is it a suitable solution to have them cached (baring in mind that we are talking millions of users)?

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  • ESXi 4.0 - cannot copy files

    - by Peter
    I am unable to copy files or make directories on my installation of VMWare ESXi 4.0. I have done so in the past (copied an iso onto a datastore). But something has changed and I have no idea what. I cannot copy using the datastore browser (get a dialog saying "Expected a PUT_FILE_DONE message. Got SESSION_COMPLETE"). I cannot create a directory through datastore browser (get a dialog saying "Cannot complete file creation operation"). When I ssh to the ESXi server I cannot create files or folders under /vmfs/volumes. But I can manipulate files elswhere (including /vmfs). Here are the permissions for the directories (I am logged in as root). ~ # ls -lh /vmfs/volumes/ drwxr-xr-t 1 root root 1.2k Sep 3 12:19 4a76f260-36b7eb85-c3b3-0024e8314929 drwxr-xr-x 1 root root 8 Jan 1 1970 4a76f261-d6190a9e-3b89-0024e8314929 drwxr-xr-t 1 root root 1.4k Sep 22 10:38 4a76f262-4ac21f0a-6bc1-0024e8314929 l--------- 0 root root 1.9k Jan 1 1970 Hypervisor1 - c42ce27f-eb8d7f70-7f70-0e7a85e8edc4 l--------- 0 root root 1.9k Jan 1 1970 Hypervisor2 - bbf1477b-4aec1d8c-caa5-5e8720bebd85 l--------- 0 root root 1.9k Jan 1 1970 Hypervisor3 - efd8efe3-03bc1cbf-15e0-080efd9e7379 drwxr-xr-x 1 root root 8 Jan 1 1970 bbf1477b-4aec1d8c-caa5-5e8720bebd85 drwxr-xr-x 1 root root 8 Jan 1 1970 c42ce27f-eb8d7f70-7f70-0e7a85e8edc4 l--------- 0 root root 1.9k Jan 1 1970 datastore1 - 4a76f260-36b7eb85-c3b3-0024e8314929 l--------- 0 root root 1.9k Jan 1 1970 datastore2 - 4a76f262-4ac21f0a-6bc1-0024e8314929 drwxr-xr-x 1 root root 8 Jan 1 1970 efd8efe3-03bc1cbf-15e0-080efd9e7379 ~ # touch /vmfs/foo.txt ~ # touch /vmfs/volumes/foo.txt touch: /vmfs/volumes/foo.txt: Operation not permitted I've googled and found nothing helpful. Does anyone out there have an idea as to what is going on? Thanks in Advance. Pete.

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  • ESXi 4.0 - cannot copy files

    - by user21368
    I am unable to copy files or make directories on my installation of VMWare ESXi 4.0. I have done so in the past (copied an iso onto a datastore). But something has changed and I have no idea what. I cannot copy using the datastore browser (get a dialog saying "Expected a PUT_FILE_DONE message. Got SESSION_COMPLETE"). I cannot create a directory through datastore browser (get a dialog saying "Cannot complete file creation operation"). When I ssh to the ESXi server I cannot create files or folders under /vmfs/volumes. But I can manipulate files elswhere (including /vmfs). Here are the permissions for the directories (I am logged in as root). ~ # ls -lh /vmfs/volumes/ drwxr-xr-t 1 root root 1.2k Sep 3 12:19 4a76f260-36b7eb85-c3b3-0024e8314929 drwxr-xr-x 1 root root 8 Jan 1 1970 4a76f261-d6190a9e-3b89-0024e8314929 drwxr-xr-t 1 root root 1.4k Sep 22 10:38 4a76f262-4ac21f0a-6bc1-0024e8314929 l--------- 0 root root 1.9k Jan 1 1970 Hypervisor1 - c42ce27f-eb8d7f70-7f70-0e7a85e8edc4 l--------- 0 root root 1.9k Jan 1 1970 Hypervisor2 - bbf1477b-4aec1d8c-caa5-5e8720bebd85 l--------- 0 root root 1.9k Jan 1 1970 Hypervisor3 - efd8efe3-03bc1cbf-15e0-080efd9e7379 drwxr-xr-x 1 root root 8 Jan 1 1970 bbf1477b-4aec1d8c-caa5-5e8720bebd85 drwxr-xr-x 1 root root 8 Jan 1 1970 c42ce27f-eb8d7f70-7f70-0e7a85e8edc4 l--------- 0 root root 1.9k Jan 1 1970 datastore1 - 4a76f260-36b7eb85-c3b3-0024e8314929 l--------- 0 root root 1.9k Jan 1 1970 datastore2 - 4a76f262-4ac21f0a-6bc1-0024e8314929 drwxr-xr-x 1 root root 8 Jan 1 1970 efd8efe3-03bc1cbf-15e0-080efd9e7379 ~ # touch /vmfs/foo.txt ~ # touch /vmfs/volumes/foo.txt touch: /vmfs/volumes/foo.txt: Operation not permitted I've googled and found nothing helpful. Does anyone out there have an idea as to what is going on? Thanks in Advance. Pete.

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  • VMWare Raw Device Mapping Not Working

    - by George H. Lenzer
    While I'm waiting for VMWare support to get back to me, I thought I'd ask here. I have a 400 gig LUN presented from a fiber channel SAN to my VMWare host. It's legacy from another virtualization platform and I need to keep it as is to avoid a long period of downtime. I formatted my VMFS3 datastore with 4 meg blocks to allow up to 1 TB disks. Then I tried adding my 400 gig disk as a raw device in physical compatibility mode. I get the error: "File is larger than the maximum size supported by datastore 'Base Test'. [Base Test]VMTEST01/VMTEST01_2.vmdk Originally I had the VMFS datastore formatted with 1 meg blocks which was the cause of this problem since the largest disk allowed would be 256 gigs. But I deleted the data store and then reformatted with 4 megs blocks. I've also tried using virtual compatibility mode for the raw device but it still fails. Does anyone have any suggestions? I've been waiting for a little over a week for VMWare, but that's fine because I'm not yet a paying customer. I'm still in the eval phase.

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  • Best Practices for adding Exchange Archive to current 3 server setup

    - by ADquestion
    I'm looking to add an Archive Database (which I know is just a Mailbox Database) to our current Exchange 2010 environment. I have done this in the past at a previous job, but we had a simpler setup than at this current job. I've been trying to find some best practices to make sure it's setup in an ideal way, but so far not finding the details I would prefer. Hoping someone on here can give me a few pointers. Currently we have a 3 server setup, Server1, Server2 and Server3. Three databases of course, DB1, DB2 and DB3. We have a DAG setup between them. Server1 has DB1 and DB3 on it, DB1 is not active, DB3 is active. Server2 has DB1 and DB2 on it, both are active. Server3 has DB2 and DB3 on it, both are not active. All three servers are virtual (VMware). Each one is setup identical to the other as follows: C:\ 60GB - OS E:\ 600GB - DB (currently only 90GB used, pointing to Datastore just for Server2) F:\ 200GB - Log (2GB used, pointing to same Datastore as above) G:\ 200GB - Restore (0 used, pointing to same Datastore as above) The drives are all set to Thin Provisioning, and it looks as though I have 600GB of available space. They have not been on Exchange that long and only have about 70GB worth of PSTs to import back in that will be going to the Archive Database, plus anything older than 2 years from their current inbox that will be moved into there. I was considering placing the Archive DB on the E:\ drive of Server3 (only) like the current DB, but wasn't sure if that was acceptable. I don't plan on setting the Archive DB up with the DAG, just plan on having it as a single repository for older emails and manually back it up every now and then. If anyone has any suggestions on this I would appreciate it the input. I've done it on a slightly smaller scale before and it worked well, but like to think it through before pulling the trigger, especially at a new job. :) Thanks again!

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  • Should an HA failover occur in this scenario?

    - by joeqwerty
    I'm running vSphere 5 in an HA cluster across two hosts (vsphereA and vsphereB). I have the HA cluster configured for host monitoring and datastore heartbeat monitoring with admission control disabled (hopefully I rightfully understand that datastore heartbeat monitoring prevents inadvertent and unwanted HA failovers due to management network isolation). Each host has a single connection to a dedicated iSCSI network and iSCSI target (no MPIO). All vmdk's for all VM's exist on the iSCSI datastore. As a test of HA I disconnected the iSCSI connection on vsphereB and was surprised to see that the running VM's on vsphereB continued to run on vsphereB. The powered off VM's were showing as inaccessible (which I expected due to the fact that they weren't running and the connection from vsphereB to the iSCSI target was severed) but the running VM's continued to run and continued to be "owned" by vsphereB. I expected to see an HA failover occur for those VM's and expected to see them "owned" by vsphereA after the HA failover (which didn't occur). I'm at a loss to understand why an HA failover didn't occur for those VM's. Am I misunderstanding in which cases an HA failover should occur?

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  • Optimizing tasks to reduce CPU in a trading application

    - by Joel
    Hello, I have designed a trading application that handles customers stocks investment portfolio. I am using two datastore kinds: Stocks - Contains unique stock name and its daily percent change. UserTransactions - Contains information regarding a specific purchase of a stock made by a user : the value of the purchase along with a reference to Stock for the current purchase. db.Model python modules: class Stocks (db.Model): stockname = db.StringProperty(multiline=True) dailyPercentChange=db.FloatProperty(default=1.0) class UserTransactions (db.Model): buyer = db.UserProperty() value=db.FloatProperty() stockref = db.ReferenceProperty(Stocks) Once an hour I need to update the database: update the daily percent change in Stocks and then update the value of all entities in UserTransactions that refer to that stock. The following python module iterates over all the stocks, update the dailyPercentChange property, and invoke a task to go over all UserTransactions entities which refer to the stock and update their value: Stocks.py # Iterate over all stocks in datastore for stock in Stocks.all(): # update daily percent change in datastore db.run_in_transaction(updateStockTxn, stock.key()) # create a task to update all user transactions entities referring to this stock taskqueue.add(url='/task', params={'stock_key': str(stock.key(), 'value' : self.request.get ('some_val_for_stock') }) def updateStockTxn(stock_key): #fetch the stock again - necessary to avoid concurrency updates stock = db.get(stock_key) stock.dailyPercentChange= data.get('some_val_for_stock') # I get this value from outside ... some more calculations here ... stock.put() Task.py (/task) # Amount of transaction per task amountPerCall=10 stock=db.get(self.request.get("stock_key")) # Get all user transactions which point to current stock user_transaction_query=stock.usertransactions_set cursor=self.request.get("cursor") if cursor: user_transaction_query.with_cursor(cursor) # Spawn another task if more than 10 transactions are in datastore transactions = user_transaction_query.fetch(amountPerCall) if len(transactions)==amountPerCall: taskqueue.add(url='/task', params={'stock_key': str(stock.key(), 'value' : self.request.get ('some_val_for_stock'), 'cursor': user_transaction_query.cursor() }) # Iterate over all transaction pointing to stock and update their value for transaction in transactions: db.run_in_transaction(updateUserTransactionTxn, transaction.key()) def updateUserTransactionTxn(transaction_key): #fetch the transaction again - necessary to avoid concurrency updates transaction = db.get(transaction_key) transaction.value= transaction.value* self.request.get ('some_val_for_stock') db.put(transaction) The problem: Currently the system works great, but the problem is that it is not scaling well… I have around 100 Stocks with 300 User Transactions, and I run the update every hour. In the dashboard, I see that the task.py takes around 65% of the CPU (Stock.py takes around 20%-30%) and I am using almost all of the 6.5 free CPU hours given to me by app engine. I have no problem to enable billing and pay for additional CPU, but the problem is the scaling of the system… Using 6.5 CPU hours for 100 stocks is very poor. I was wondering, given the requirements of the system as mentioned above, if there is a better and more efficient implementation (or just a small change that can help with the current implemntation) than the one presented here. Thanks!! Joel

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  • Google App Engine - The most awaited feature

    - by systempuntoout
    This list is taken from the official Google App Engine roadmap: SSL for third-party domains Background servers capable of running for longer than 30s Ability to reserve instances to reduce application loading overhead Ability to select different availability vs. latency options for Datastore Support for mapping operations across datasets Datastore dump and restore facility Raise request/response size limits for some APIs Improved monitoring and alerting of application serving Support for Browser Push (Comet) communication Built-in support for OAuth & OpenID What is your most awaited feature and why?

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  • When should one use the following: Amazon EC2, Google App Engine, Microsoft Azure and Salesforce.com

    - by vicky21
    I am asking this in very general sense. Both from cloud provider and cloud consumer's perspective. Also the question is not for any specific kind of application (in fact the intention is to know which type of applications/domains can fit into which of the cloud slab -SaaS PaaS IaaS). My understanding so far is: IaaS: Raw Hardware (Processors, Networks, Storage). PaaS: OS, System Softwares, Development Framework, Virtual Machines. SaaS: Software Applications. It would be great if Stackoverflower's can share their understanding and experiences of cloud computing concept. EDIT: Ok, I will put it in more specific way - Amazon EC2: You don't have control over hardware layer. But you can take your choice of OS image, Dev Framework (.NET, J2EE, LAMP) and Application and put it on EC2 hardware. Can you deploy an applications built with Google App Engine or Azure on EC2? Google App Engine: You don't have control over hardware and OS and you get a specific Dev Framework to build your application. Can you take any existing Java or Python application and port it to GAE? Or vice versa, can applications that were built on GAE be taken out of GAE and ported to any Application Server like Websphere or Weblogic? Azure: You don't have control over hardware and OS and you get a specific Dev Framework to build your application. Can you take any existing .NET application and port it to Azure? Or vice versa, can applications that were built on Azure be taken out of Azure and ported to any Application Server like Biztalk?

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  • How do you Access an Authenticated Google App Engine Service with Ruby?

    - by viatropos
    I am trying to do this same thing here but with Ruby: Access Authenticated GAE Client with Python. Any ideas how to retrieve authenticated content from GAE with Ruby? I am using the Ruby GData Gem to access everything in Google Docs and such and it's making life very easy, but now I'd like to access things on GAE that require admin access, programmatically, and it doesn't support that. Here's what I'm getting (using DocList, not sure what to use yet): c = GData::Client::DocList.new c.clientlogin(username, password, nil, nil, nil, "HOSTED") c => #<GData::Client::DocList:0x201bad8 @clientlogin_service="writely", @version="2", @auth_handler=#<GData::Auth::ClientLogin:0x200803c @account_type="HOSTED", @token="long-hash", @auth_url="https://www.google.com/accounts/ClientLogin", @service="writely">, @source="AnonymousApp", @headers={"Authorization"=>"GoogleLogin auth=long-hash", "User-Agent"=>"GoogleDataRubyUtil-AnonymousApp", "GData-Version"=>"2", "Content-Type"=>"application/atom+xml"}, @authsub_scope="http://docs.google.com/feeds/", @http_service=GData::HTTP::DefaultService> url = "http://my-cdn.appspot.com/files/restricted-file.html" c.get(url) => #<GData::HTTP::Response:0x20004b8 @status_code=302, @body="", @headers={"connection"=>"close", "date"=>"Sun, 11 Apr 2010 00:30:20 GMT", "content-type"=>"text/html", "server"=>"Google Frontend", "content-length"=>"0", "location"=>"https://www.google.com/accounts/ServiceLogin service=ah&continue=http://my-cdn.appspot.com/_ah/login%3Fcontinue%3D http://my-cdn.appspot.com/files/restricted-file.html& ltmpl=gm&ahname=My+CDN&sig=a-signature"}> Any tips? That other SO question pointed to doing something with the redirect... Not sure how to handle that. Just looking for a point in the right direction from the ruby experts. Thanks.

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  • Debugging a Google Web Toolkit application that has an error when deployed on Google App Engine

    - by gerdemb
    I have a Google Web Toolkit application that I am deploying to Google App Engine. In the deployed application, I am getting a JavaScript error Uncaught TypeError: Cannot read property 'f' of null. This sounds like the JavaScript equivalent of a Java NullPointerException. The problem is that the GWT JavaScript is obfuscated, so it's impossible to debug in the browser and I can't reproduce the same problem in hosted mode where I could use the Java debugger. I think the reason I'm only seeing the error on the deployed application is that the database I'm using on the GAE server is triggering something differently than the test database I'm using during testing and development. So, any ideas about the best way to proceed? I've thought of the following things: Deploy a non-obsfucated version of my application. Despite a lot of Googling, I can't figure out how to do this using the automatic deploy script provided with the Google Eclipse Plugin. Does anyone know? Download and copy my GAE data to the local server Somehow point my development code to use the GAE server for data instead of the local test database. This seems like the best idea... Can anyone suggest how to proceed here? Finally, is there a way to catch these JavaScript errors on the production server and log them somewhere? Without logging, I won't have anyway to know if my users are having errors that don't occur on the server. The GWT.log() function is automatically stripped out of the production code...

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