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• Rails app complaining can't connect to memcached but I'm pretty sure it's running

  - by centipedefarmer

  All was well, then I rebooted the server. Right now: $ ps aux | grep memcache 1000 27168 0.0 0.0 121972 1056 pts/0 Sl 15:18 0:00 memcached -m 64 -p 11211 -u nobody -l 127.0.0.1 1000 27816 0.0 0.0 7628 956 pts/0 S+ 15:36 0:00 grep memcache meanwhile the rails app's log is getting tons of this: MemCacheError (No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:55 -0600 2011)): No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:55 -0600 2011) MemCacheError (No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:55 -0600 2011)): No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:55 -0600 2011) MemCacheError (No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:55 -0600 2011)): No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:55 -0600 2011) MemCacheError (No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:55 -0600 2011)): No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:55 -0600 2011) MemCacheError (No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:56 -0600 2011)): No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:56 -0600 2011) MemCacheError (No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:56 -0600 2011)): No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:56 -0600 2011) MemCacheError (No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:56 -0600 2011)): No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:56 -0600 2011) MemCacheError (No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:56 -0600 2011)): No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:56 -0600 2011) Being that I'm more of a developer than a server guy, and being that we don't really have a "server guy," and this being in production... where do I start with this?

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• Windows Remote-App Server 2012 Office 2013 User Settings not saved

  - by dave

  I have a Windows Server 2012 with RemoteApps enabled. It's running the latest Patches etc. It has Office 2013 installed and Excel and Word are shared to all users. Now I got the Problem that after each Reboot all User Settings are lost. I have a few users who pin previously opened Documents so they dont need to remember all Paths and those are all gone after Reboot. Also last opened Documents is empty and after a Server reboot it brings the office 2013 Window for First time setup where it asks if you want to connect to skydrive and all that. In the RemoteApps Collection I enabled a Userprofile-Drive 100GB drive E: for Storing User profile data. There is a Domain of course and there is no GPO Preventing the user from Storing settings etc. We also got an older Terminal Server 2003 in the same Domain where this is not happening. Any ideas why this is happening that all the Settings are lost after Reboot?

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• Java web app deployment and ControlTier adoption

  - by Ran

  I've been searching for a configuration and deployment manager tool for my java-linux based web service and have been looking mainly at ControlTier (http://controltier.org). We operate at a medium scale (100's of hosts, multi-DC, dozens of services). There seem to be be plenty of lower level system admin tools such as chef, puppet, cfengine, bcfg2 and more and my understanding and the reason I'm calling them "low level" is that they are great for system level administration tasks such as setting up a mount, file permissions, users etc but aren't designed, for example for java deployments, which usually come with a build process and special java semantics. In many cases any tool can be used to do anything but if it was not designed for the task it can get uncomfortable. OTOH control-tier seem to have been designed just for that - java application deployments, at least that's what all the tutorials on their site demonstrate but here's the problem - The wiki at http://controltier.org/wiki/ is pretty good and stuffed with examples and the company behind the open source CT product is very responsive (pushy...) however, I'm yet to have seen any material from 3rd party users on the net. No success stories, no detailed blog posts, no best practices, no cheat sheets, not even hate letters, nothing. This plays badly for DTO solutions, CT's sponsor for two reasons, one is that it makes me suspicious what's the reason for the poor adoption? and second, what do I do if I get stuck and there's no help page on CT's wiki page and the mailing list is too slow to answer. I'm stuck with a "free" product that a consultancy company is pushing. So my question here - I'd be interested in hearing if anyone has had real world experience with CT for java based web app deployments and if he'd thumb up the product? Any other comments that may enlighten me are welcome of course...

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• How to diagnose website performance/app pool recycling with Windows 2008/IIS7

  - by ilasno

  Ok, so there are various symptoms here (clients and and our own employees complaining of intermittent slowdowns, getting 'kicked out' to login page or just having a save request not properly save the submitted data). The environment: Windows Server 2008 (Datacenter), Service Pack 2, 64-bit, 2x2.8 GHz processors, 7.5 GB RAM MS SQL Server 2008 (running on the same machine) IIS 7 There are ~10 websites running on the server, each in their own application pool - most of these pools are running in Integrated mode, 2 are in Classic, all are on .NET 2.0 and all run as ApplicationPoolIdentity. I'm trying to analyze, diagnose, and troubleshoot and am struggling with where to get more info about what could be happening. Here are some steps i have already taken: Set each application pool to recycle once per day, and removed any other automatic recycling Set a Virtual Memory Limit for each to 1024000KB (1GB) Enabled ALL 'Generate Recycle Event Log Entry' entries (Config Changes, Isapi Reported Unhealthy, Manual Recycle, Private Memory Limit Exceeded, Regular Time Interval, Request Limit Exceeded, Specific Time, Virtual Memory Limit Exceeded) I have seen the app pool processes recycle (in Task Manager) - a new one will start up, and then the first one dies off - and this has happened without the memory or time going over the settings. This is a fairly new server, and most of these came from Windows Server 2003/IIS6. Any 'next steps' for setting up information gathering, logging, diagnosing, etc. would be much appreciated! j

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• Kerberos: Running an app with a parameter using krenew

  - by Mihai Todor

  I need to run an application with krenew, but the application also needs to receive a parameter via command line and I need to send its output to a file. From the documentation, it looks like this should do the trick: krenew -t -- sh -c 'compute-job > /afs/local/data/output' but, unfortunately, when I run the command below: krenew -s -- sh -c './my_app config.xml > results/test.txt &' the application just dies after a while and I can see from the output of ps aux that krenew is not running along with my_app. I am not sure what the parameter -t does, and as far as I can see, if I run krenew -s ./my_app, it works properly. I hope someone can clarify this.

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• Windows 7 - Intermittently processes will not close when the app closes

  - by Bill Sambrone

  I have a user I am supporting who has the strangest issue. There are 2 problem applications, Word 2010 and a scanning program called ScandallPro. Intermittently (and at least once a day), she will close an app and the underlying process will not close. Both Word 2010 and this scanning software have all the latest updates. There is another user who has the same software that does not have this problem, and has identical hardware. I have formatted and rebuilt the computer for the user who is having the problems. After the rebuild, the machine was fine for a day but the scanning software continues to intermittently keep the process running even after it is closed. This is a problem because she cannot open a new instance of it while the process is still running. There is a boatload of line of business software on this machine, all of which she needs. I believe the Word 2010 issue is due to a misbehaving add-in (there are 2 add-ins, neither of which seem stable), and I think my best bet is to work with the add-in vendor on it. The scanning program staying open is isolated to this 1 user. The only difference between her machine and the other user is that she has Quickbooks, RoboForm, and Adobe Acrobat X Pro. Any ideas of what can be causing this, or other diagnostic steps to try?

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• IIS 6 Windows Authentication in ASP.Net app fails

  - by Kjensen

  I am trying to install an ASP.Net app on an IIS6 webserver. The site requires the user to authenticate with windows, and this works on several other apps on the same server. In IIS I have enabled anonymous access and windows authentication. In web.config, authentication is set to: <authentication mode="Windows"/> and authorization...: <authorization> <allow roles="Users"/> <deny users="*"/> </authorization> Ie. allow all users in role "Users" and deny everybody else. This is the approach that is working with several other apps on the same server. If I run the site, I am prompted for username and password. If I remove the line: <deny users="*"/> I can access the site and everything works - but the user credentials are not passed to the site (Page.User.Identity.Name returns a blank string in ASP.Net). The site has identical (inherited) file permissions as other working sites on the server. The only difference in authentication/authorization between this site and the other working sites is, that this runs Asp.Net 4 (but there are other working asp.net 4 sites on the server as well). What am I missing here? Where should I look?

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• Mac OS X Terminal.app Ubuntu 9.10 SSHD and incorrect keyboard mapping

  - by Jesse

  Does anyone have any Idea how to handle this? I can't stand connecting to certain Ubuntu boxes via Mac OS X because of issues with keyboard layout etc. I have set TERM=vt100 and TERM=xterm-color in Ubuntu .bashrc and also in the Terminal.app advanced preferences and nothing seems to fix this issue. Trying to use arrow keys on slim silver keyboard results in ^[[A etc. From Answer OS X 10.6.4 When I try to run /lib/terminfo/x/xterm-color I get permission denied? Maybe this is the issue?! Regular bash login shell. If I sudo often it works. Which leads me to believe the above permissions problem is the cause. Output from stty -a: $ stty -a speed 9600 baud; rows 47; columns 181; line = 0; intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = M-^?; eol2 = M-^?; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0; -parenb -parodd cs8 -hupcl -cstopb cread -clocal -crtscts -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff -iuclc ixany imaxbel -iutf8 opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0 isig icanon iexten echo echoe -echok -echonl -noflsh -xcase -tostop -echoprt echoctl echoke

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• Microsoft Mouse and Keyboard Center - Slow response for App-specific shortcuts

  - by Darrel Hoffman

  So a few months ago, I bought a new MS mouse, and was surprised that they'd discontinued Intellipoint in favor of this Microsoft Mouse and Keyboard Center. It seems to have the same functionality underneath all the bloat, but there's a very serious drawback - when I set up application-specific functions for the extra buttons on the mouse, they work, but sometimes with a very long delay, like up to a minute or more. For example, I often set up the left side button as an "Undo" in various programs for convenience. But sometimes, when I try to use that Undo button, nothing happens, so I'm forced to use the standard Ctrl-Z or whatever. But then, a minute or so later, it suddenly remembers that I hit that button a while back, and calls the Undo unexpectedly on something entirely different. It's infuriating. No modern computer function should be this slow. It's not the software or the computer itself, because doing an Undo via Ctrl-Z or the menu still works instantly. It's very definitely a side-effect of delayed response to the mouse button. Usually after it delays the first time, it'll work quickly after that, but if you haven't used a given shortcut in several minutes, it "forgets" again and you get another inexplicably long delay. Intellipoint never had this problem, but it's not supported any more, and not compatible with the newer mice. Has anyone else noticed slow-downs with MS M&K C and app-specific shortcuts? Any ideas how to get around this? I use these shortcuts extensively in my workflow and it's just entirely unacceptable to have such a long delay in what should be a pretty basic feature.

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• Restricting access to one controller of an MVC app with Nginx

  - by kgb

  I have an MVC app where one controller needs to be accessible only from several ips(this controller is an oauth token callback trap - for google/fb api tokens). My conf looks like this: geo $oauth { default 0; 87.240.156.0/24 1; 87.240.131.0/24 1; } server { listen 80; server_name some.server.name.tld default_server; root /home/user/path; index index.php; location /oauth { deny all; if ($oauth) { rewrite ^(.*)$ /index.php last; } } location / { if ($request_filename !~ "\.(phtml|html|htm|jpg|jpeg|gif|png|ico|css|zip|tgz|gz|rar|bz2|doc|xls|exe|pdf|ppt|txt|tar|mid|midi|wav|bmp|rtf|js|xlsx)$") { rewrite ^(.*)$ /index.php last; break; } } location ~ \.php$ { fastcgi_pass unix:/var/run/php5-fpm.sock; fastcgi_index index.php; include fastcgi_params; } } It works, but does not look right. The following seems logical to me: location /oauth { allow 87.240.156.0/24; deny all; rewrite ^(.*)$ /index.php last; } But this way rewrite happens all the time, allow and deny directives are ignored. I don't understand why...

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• Shortcut To Full Screen App In Lion

  - by omghai2u

  I postponed getting OSX Lion for as long as I possibly could. Now that I have it, I'm having lots of difficulties getting it to perform how I want. On Snow Leopard my typical setup for working was 4 spaces. I'd keep a Windows VM open on Space #4 full-screened, a Linux open on space #3, and I'd do other stuff on spaces #1 and #2. My keyboard shortcut allowed me to switch between my Windows work (Command + 4) to my Linux work (Command + 3) very quickly, and without the need for my hands to leave the keyboard (or effectively to even quit typing). Productivity was good. I see that on Lion a full-screened VM (and yes, they need to be full screened, Fusion's Unity won't cut it for what I need to do) is its own separate Desktop. I have set up 4 desktops and made my keyboard shortcuts to move between them Command + # just as before. But how do I get my full-screened VM to be one of those already existing desktops? Or, rather, how do I make a short-cut for the full-screened app?

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• How to unit test models in MVC / MVR app?

  - by BBnyc

  I'm building a node.js web app and am trying to do so for the first time in a test driven fashion. I'm using nodeunit for testing, which I find allows me to write tests quickly and painlessly. In this particular app, the heavy lifting primarily involves translating SQL data into complex Javascript object and serving them to the front-end via json. Likewise, the app also spends a great deal of code validating and translating complex, multidimensional Javascript objects it receives from the front-end into SQL rows. Hence I have used a fat model design for the app -- most of the real code resides in the models, where the data translation happens. What's the best approach to test such models with unit tests? I mean in particular the methods that have create javascript objects from the SQL rows and serve them to the front-end. Right now what I'm doing is making particular requests of my models with the unit tests and checking the returned data for all of the fields that should be there. However I have a suspicion that this is not the most robust kind of testing I could be doing. My current testing design also means I have to package my app code with some dummy data so that my tests can anticipate the kind of data that the app should be returning when tests run.

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• How to set up a personal Apple developer account now with an eye on transferring app ownership to a company later?

  - by Rinzwind

  I have two Mac applications that I wrote for my own personal use, but I'm considering polishing them up and giving selling them on the Mac App Store a try. It seemed very premature to consider what would happen if either app would become successful enough to make it possible to set up a business around it, or to sell it to another developer. That is, until I read that Apple doesn't make it easy to transfer app ownership. I'm not sure how to best register with the Apple Developer program now to avoid any possible hassle in this respect later. From what I understand, one can really only transfer ownership of a developer account. I'm not sure about the relationship between an Apple ID and an Apple developer account. Does this mean I should at least not use the Apple ID I'm already using for iTunes, but create a second one to use for registering as an Apple Developer? Is there any disadvantage to using separate Apple IDs like this on the same Mac (one ID for Xcode development, the other ID for iTunes/iCloud/App Store/...)? Should one go as far as having a separate Apple ID & Apple developer account per app one develops? Or is there some other solution to take into account the possibility of transferring app ownership?

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• The model to sell apps on App Store is better with a paid only version?

  - by ????

  Rob Napier, the author of iOS 5 Programming Pushing the Limits, mentioned there are several models of selling apps on the App Store: Write an app and sell it Publish a free and a full version Ad supported by third party or by iAd In App purchase Surprisingly, the author said that the most workable model is (1) in terms of sales. I would think that (2) with fairly limiting ability for the free version can bring more sales, as people without trying, might not plunge down $0.99 or $1.99 for something they haven't tried? I for one, might not have purchased Angry Birds if I didn't try their free version first. Also, I think it also depends on the situation: if the app is about alarm clock, and there are already 5 alarm clocks in App Store that are free, then your app that is $0.99 might not be that eagerly purchased. If yours is also free, and users really like it out of all the other ones, then they may think, $0.99 is nothing to get a good alarm clock, and gladly pay you the $0.99 in exchange for a full version of the alarm clock, something that they can't get with the free version. (such as the full version can let you choose a song from your Music Library for the alarm). Could (1) work only if the user definitely want it and have no substitute? How might it work the best?

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• DomainDataSource DataPager with silverlight 3 DataGrid & .Net RIA Services

  - by Dennis Ward

  I have a simple datagrid example with silverlight 3, and am populating it with the .NET ria services using a DomainDataSource along with a DataPager declaratively (nothing in the code-behind), and am experiencing this problem: The LoadSize is 30, and the Page size is 15, and when the page is loaded, the 1st and 2nd page appear correctly, but when I go beyond the 2nd page, nothing shows up in the grid. This used to work in the silverlight 3 beta with the Mix 2009 preview of .NET Ria services, and I've got a really simple example and have verified that the Service on the web project gets called to load a new batch, but the grid doesn't show any data. Can anyone shed any light as to why grid displays data only for the initial load of data and not subsequent batches from the pager? Here's my xaml: <riaControls:DomainDataSource x:Name="ArtistSource" QueryName="GetArtist" AutoLoad="True" LoadSize="30" PageSize="15"> <riaControls:DomainDataSource.DomainContext> <domain:AdminContext /> </riaControls:DomainDataSource.DomainContext> </riaControls:DomainDataSource> <data:DataGrid Grid.Row="1" x:Name="ArtistDataGrid" ItemsSource="{Binding Data, ElementName=ArtistSource}"> </data:DataGrid> <StackPanel Grid.Row="2"> <data:DataPager Source="{Binding Data, ElementName=ArtistSource}" /> </StackPanel>

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• How to populate Java (web) application with initial data using Spring/JPA/Hibernate

  - by Tuukka Mustonen

  I want to setup my database with initial data programmatically. I want to populate my database for development runs, not for testing runs (it's easy). The product is built on top of Spring and JPA/Hibernate. Developer checks out the project Developer runs command/script to setup database with initial data Developer starts application (server) and begins developing/testing then: Developer runs command/script to flush the database and set it up with new initial data because database structures or the initial data bundle were changed What I want is to setup my environment by required parts in order to call my DAOs and insert new objects into database. I do not want to create initial data sets in raw SQL, XML, take dumps of database or whatever. I want to programmatically create objects and persist them in database as I would in normal application logic. One way to accomplish this would be to start up my application normally and run a special servlet that does the initialization. But is that really the way to go? I would love to execute the initial data setup as Maven task and I don't know how to do that if I take the servlet approach. There is somewhat similar question. I took a quick glance at the suggested DBUnit and Unitils. But they seem to be heavily focused in setting up testing environments, which is not what I want here. DBUnit does initial data population, but only using xml/csv fixtures, which is not what I'm after here. Then, Maven has SQL plugin, but I don't want to handle raw SQL. Maven also has Hibernate plugin, but it seems to help only in Hibernate configuration and table schema creation (not in populating db with data). How to do this?

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• R and version control for the solo data analyst

  - by Jeromy Anglim

  Many data analysts that I respect use version control. For example: http://github.com/hadley/ See comments on http://permut.wordpress.com/2010/04/21/revision-control-statistics-bleg/ However, I'm evaluating whether adopting a version control system such as git would be worthwhile. A brief overview: I'm a social scientist who uses R to analyse data for research publications. I don't currently produce R packages. My R code for a project typically includes a few thousand lines of code for data input, cleaning, manipulation, analyses, and output generation. Publications are typically written using LaTeX. With regards to version control there are many benefits which I have read about, yet they seem to be less relevant to the solo data analyst. Backup: I have a backup system already in place. Forking and rewinding: I've never felt the need to do this, but I can see how it could be useful (e.g., you are preparing multiple journal articles based on the same dataset; you are preparing a report that is updated monthly, etc) Collaboration: Most of the time I am analysing data myself, thus, I woudln't get the collaboration benefits of version control. There are also several potential costs involved with adopting version control: Time to evaluate and learn a version control system A possible increase in complexity over my current file management system However, I still have the feeling that I'm missing something. General guides on version control seem to be addressed more towards computer scientists than data analysts. Thus, specifically in relation to data analysts in circumstances similar to those listed above: Is version control worth the effort? What are the main pros and cons of adopting version control? What is a good strategy for getting started with version control for data analysis with R (e.g., examples, workflow ideas, software, links to guides)?

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• XML Schema Migration

  - by Corwin Joy

  I am working on a project where we need to save data in an XML format. The problem is, over time we expect the format / schema for our data to change. What we want to be able to do is to produce scripts to migrate our data across different schema versions. We distribute our product to thousands of customers so we need to be able to run / apply these scripts at customer sites (so we can't just do the conversions by hand). I think that what we are looking for is some kind of XML data migration tool. In my mind the ideal tool could: Do an "XML diff" of two schema to identify added/deleted/changed nodes. Allow us to specify transformation functions. So, for example, we might add a new element to our schema that is a function of the old elements. (E.g. a new element C where C = A+B, A + B are old elements). So I think I am looking for a kind of XML diff and patch tool which can also apply transformation functions. One tool I am looking at for this is Altova's MapForce . I'm sure others here have had to deal with XML data format migration. How did you handle it? Edit: One point of clarification. The "diff" I plan to do is on the schema or .xsd files. The actual changes will be made to particular data sets that follow a given schema. These data sets will be .xml files. So its a "diff" of the schema to help figure out what changes need to be made to data sets to migrate them from one scheme to another.

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• Enormous data and PHP errors

  - by salamis

  I am currently using the following HighCharts:HighStock:Charts: http://www.highcharts.com/stock/demo/data-grouping in order to display the data returned from the server. We retrieve the data from a MySQL database and is really big. We are storing sensor metrics every 1 second. After a while we got the following error: [Wed Sep 12 00:15:56 2012] [error] [client 127.0.0.1] PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 4756882 bytes) in C:\\wamp\\www\\admin\\getTrends.php on line 156, referer: http://localhost/admin/trends.php [Wed Sep 12 00:15:56 2012] [error] [client 127.0.0.1] PHP Stack trace:, referer: http://localhost/admin/trends.php [Wed Sep 12 00:15:56 2012] [error] [client 127.0.0.1] PHP 1. {main}() C:\\wamp\\www\\admin\\getTrends.php:0, referer: http://localhost/admin/trends.php [Wed Sep 12 00:15:56 2012] [error] [client 127.0.0.1] PHP 2. getTrendsDataAI() C:\\wamp\\www\\admin\\getTrends.php:33, referer: http://localhost/admin/trends.php [Wed Sep 12 00:15:56 2012] [error] [client 127.0.0.1] PHP 3. printResults() C:\\wamp\\www\\admin\\getTrends.php:102, referer: http://localhost/admin/trends.php [Wed Sep 12 00:15:56 2012] [error] [client 127.0.0.1] PHP 4. createData() C:\\wamp\\www\\admin\\getTrends.php:230, referer: http://localhost/admin/trends.php [Wed Sep 12 00:15:56 2012] [error] [client 127.0.0.1] PHP 5. implode() C:\\wamp\\www\\admin\\getTrends.php:156, referer: http://localhost/admin/trends.php What is the best solution to return this data as JSON object to HighStocks for viewing? And how can we overcome the PHP limitation? Shall we return chunk of data each time? How do they usually present enormous amount of data to the users and creating charts and reports from this data? Another big problem that we need to overcome is that the returned JSON object is enormous. At this point is around 20-30 mbs and it will be much larger in the future. Is it ok to return this data to the user and perform everything client side? Any suggestions or thoughts welcome.

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• GAE python database object design for simple list of values

  - by Joey

  I'm really new to database object design so please forgive any weirdness in my question. Basically, I am use Google AppEngine (Python) and contructing an object to track user info. One of these pieces of data is 40 Achievement scores. Do I make a list of ints in the User object for this? Or do I make a separate entity with my user id, the achievement index (0-39) and the score and then do a query to grab these 40 items every time I want to get the user data in total? The latter approach seems more object oriented to me, and certainly better if I extend it to have more than just scores for these 40 achievements. However, considering that I might not extend it, should I even consider just doing a simple list of 40 ints in my user data? I would then forgo doing a query, getting the sorted list of achievements, reading the score from each one just to process a response etc. Is doing this latter approach just such a common practice and hand-waved as not even worth batting an eyelash at in terms of thinking it might be more costly or complex processing wise?

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• HttpError 502 with Google Wave Active Robot API fetch_wavelet()

  - by Drew LeSueur

  I am trying to use the Google Wave Active Robot API fetch_wavelet() and I get an HTTP 502 error example: from waveapi import robot import passwords robot = robot.Robot('gae-run', 'http://images.com/fake-image.jpg') robot.setup_oauth(passwords.CONSUMER_KEY, passwords.CONSUMER_SECRET, server_rpc_base='http://www-opensocial.googleusercontent.com/api/rpc') wavelet = robot.fetch_wavelet('googlewave.com!w+dtuZi6t3C','googlewave.com!conv+root') robot.submit(wavelet) self.response.out.write(wavelet.creator) But the error I get is this: Traceback (most recent call last): File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/webapp/__init__.py", line 511, in __call__ handler.get(*groups) File "/base/data/home/apps/clstff/gae-run.342467577023864664/main.py", line 23, in get robot.submit(wavelet) File "/base/data/home/apps/clstff/gae-run.342467577023864664/waveapi/robot.py", line 486, in submit res = self.make_rpc(pending) File "/base/data/home/apps/clstff/gae-run.342467577023864664/waveapi/robot.py", line 251, in make_rpc raise IOError('HttpError ' + str(code)) IOError: HttpError 502 Any ideas? Edit: When [email protected] is not a member of the wave I get the correct error message Error: RPC Error500: internalError: [email protected] is not a participant of wave id: [WaveId:googlewave.com!w+Pq1HgvssD] wavelet id: [WaveletId:googlewave.com!conv+root]. Unable to apply operation: {'method':'robot.fetchWave','id':'655720','waveId':'googlewave.com!w+Pq1HgvssD','waveletId':'googlewave.com!conv+root','blipId':'null','parameters':{}} But when [email protected] is a member of the wave I get the http 502 error. IOError: HttpError 502

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• How do you remove invalid hexadecimal characters from an XML-based data source prior to constructing

  - by Oppositional

  Is there any easy/general way to clean an XML based data source prior to using it in an XmlReader so that I can gracefully consume XML data that is non-conformant to the hexadecimal character restrictions placed on XML? Note: The solution needs to handle XML data sources that use character encodings other than UTF-8, e.g. by specifying the character encoding at the XML document declaration. Not mangling the character encoding of the source while stripping invalid hexadecimal characters has been a major sticking point. The removal of invalid hexadecimal characters should only remove hexadecimal encoded values, as you can often find href values in data that happens to contains a string that would be a string match for a hexadecimal character. Background: I need to consume an XML-based data source that conforms to a specific format (think Atom or RSS feeds), but want to be able to consume data sources that have been published which contain invalid hexadecimal characters per the XML specification. In .NET if you have a Stream that represents the XML data source, and then attempt to parse it using an XmlReader and/or XPathDocument, an exception is raised due to the inclusion of invalid hexadecimal characters in the XML data. My current attempt to resolve this issue is to parse the Stream as a string and use a regular expression to remove and/or replace the invalid hexadecimal characters, but I am looking for a more performant solution.

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• Working with images (CGImage), exif data, and file icons

  - by Nick

  What I am trying to do (under 10.6).... I have an image (jpeg) that includes an icon in the image file (that is you see an icon based on the image in the file, as opposed to a generic jpeg icon in file open dialogs in a program). I wish to edit the exif metadata, save it back to the image in a new file. Ideally I would like to save this back to an exact copy of the file (i.e. preserving any custom embedded icons created etc.), however, in my hands the icon is lost. My code (some bits removed for ease of reading): // set up source ref I THINK THE PROBLEM IS HERE - NOT GRABBING THE INITIAL DATA CGImageSourceRef source = CGImageSourceCreateWithURL( (CFURLRef) URL,NULL); // snag metadata NSDictionary *metadata = (NSDictionary *) CGImageSourceCopyPropertiesAtIndex(source,0,NULL); // make metadata mutable NSMutableDictionary *metadataAsMutable = [[metadata mutableCopy] autorelease]; // grab exif NSMutableDictionary *EXIFDictionary = [[[metadata objectForKey:(NSString *)kCGImagePropertyExifDictionary] mutableCopy] autorelease]; << edit exif >> // add back edited exif [metadataAsMutable setObject:EXIFDictionary forKey:(NSString *)kCGImagePropertyExifDictionary]; // get source type CFStringRef UTI = CGImageSourceGetType(source); // set up write data NSMutableData *data = [NSMutableData data]; CGImageDestinationRef destination = CGImageDestinationCreateWithData((CFMutableDataRef)data,UTI,1,NULL); //add the image plus modified metadata PROBLEM HERE? NOT ADDING THE ICON CGImageDestinationAddImageFromSource(destination,source,0, (CFDictionaryRef) metadataAsMutable); // write to data BOOL success = NO; success = CGImageDestinationFinalize(destination); // save data to disk [data writeToURL:saveURL atomically:YES]; //cleanup CFRelease(destination); CFRelease(source); I don't know if this is really a question of image handling, file handing, post-save processing (I could use sip), or me just being think (I suspect the last). Nick

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• What's the fastest way to bulk insert a lot of data in SQL Server (C# client)

  - by Andrew

  I am hitting some performance bottlenecks with my C# client inserting bulk data into a SQL Server 2005 database and I'm looking for ways in which to speed up the process. I am already using the SqlClient.SqlBulkCopy (which is based on TDS) to speed up the data transfer across the wire which helped a lot, but I'm still looking for more. I have a simple table that looks like this: CREATE TABLE [BulkData]( [ContainerId] [int] NOT NULL, [BinId] [smallint] NOT NULL, [Sequence] [smallint] NOT NULL, [ItemId] [int] NOT NULL, [Left] [smallint] NOT NULL, [Top] [smallint] NOT NULL, [Right] [smallint] NOT NULL, [Bottom] [smallint] NOT NULL, CONSTRAINT [PKBulkData] PRIMARY KEY CLUSTERED ( [ContainerIdId] ASC, [BinId] ASC, [Sequence] ASC )) I'm inserting data in chunks that average about 300 rows where ContainerId and BinId are constant in each chunk and the Sequence value is 0-n and the values are pre-sorted based on the primary key. The %Disk time performance counter spends a lot of time at 100% so it is clear that disk IO is the main issue but the speeds I'm getting are several orders of magnitude below a raw file copy. Does it help any if I: Drop the Primary key while I am doing the inserting and recreate it later Do inserts into a temporary table with the same schema and periodically transfer them into the main table to keep the size of the table where insertions are happening small Anything else? -- Based on the responses I have gotten, let me clarify a little bit: Portman: I'm using a clustered index because when the data is all imported I will need to access data sequentially in that order. I don't particularly need the index to be there while importing the data. Is there any advantage to having a nonclustered PK index while doing the inserts as opposed to dropping the constraint entirely for import? Chopeen: The data is being generated remotely on many other machines (my SQL server can only handle about 10 currently, but I would love to be able to add more). It's not practical to run the entire process on the local machine because it would then have to process 50 times as much input data to generate the output. Jason: I am not doing any concurrent queries against the table during the import process, I will try dropping the primary key and see if that helps. ~ Andrew

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• Urgent: Sort HashSet() function data in sequence

  - by vincent low

  i am new to java, the function i like to perform is something like: i will load a series of data from a file, into my hashSet() function. the problem is, i able to enter all the data in sequence, but i cant retrieve it out in sequence base on the account name in the file. any 1 can help to give a comment? below is my code: public Set retrieveHistory(){ Set dataGroup = new HashSet(); try{ File file = new File("C:\\Documents and Settings\\vincent\\My Documents\\NetBeansProjects\\vincenttesting\\src\\vincenttesting\\vincenthistory.txt"); BufferedReader br = new BufferedReader(new FileReader(file)); String data = br.readLine(); while(data != null){ System.out.println("This is all the record:"+data); Customer cust = new Customer(); //break the data based on the , String array[] = data.split(","); cust.setCustomerName(array[0]); cust.setpassword(array[1]); cust.setlocation(array[2]); cust.setday(array[3]); cust.setmonth(array[4]); cust.setyear(array[5]); cust.setAmount(Double.parseDouble(array[6])); cust.settransaction(Double.parseDouble(array[7])); dataGroup.add(cust); //then proced to read next customer. data = br.readLine(); } br.close(); }catch(Exception e){ System.out.println("error" +e); } return dataGroup; } public static void main(String[] args) { FileReadDataModel fr = new FileReadDataModel(); Set customerGroup = fr.retrieveHistory(); System.out.println(e); for(Object obj : customerGroup){ Customer cust = (Customer)obj; System.out.println("Cust name :" +cust.getCustomerName()); System.out.println("Cust amount :" +cust.getAmount()); }

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