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• Nearest PC equivalent to Mac Target Disk Mode?

  - by username

  Mac firmware has a special boot mode that allows you to offer its internal hdd to another computer as an external disk (you just connect the two machines via an IEEE 1394 cable). Only the second machine needs a functioning OS installed. Any good suggestions for something similar on the PC side of things? Block level access isn't important to me, I'd just like to be able to copy files off it. It doesn't matter to me if it uses Ethernet, IEEE 1394, or wifi - I just like having a quick way to access files on a client PC. Is there any single-purpose Linux distro specially designed to do this? It'd be nice to have something super simple, quickbooting, and small that I could install on a USB drive. I used to use Knoppix, but it's overkill as a Target Mode replacement.

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• Input validation in WPF

  - by irfanali-wpfexpert

  i am developing an application in wpf using MVVM design pattern. i have a listbox when an item is slected then a dialog is open having the same record in editable mode. this dialog is binded with the selected item of the list. i have apply the validation rule for textbox using IDataErrorInfo. when the user update a record on dialogbox then at every key press, the selected record in listbox is also changed. if the user press save button then i submit changes to database. but if user click cancel button then i do not submit changes to database but the list box is updated with the current updation in GUI. when i refresh the list then old value appears again. My requirement is to update the listbox only when the user hit the save button but not on every key press on dialog box. I first fill the generic list with the linq to sql classes then bind the listbox with it. Please let me know what i have to do. Thanks in advance

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• Install mountain lion by using the .dmg from installer app

  - by Leonardo

  I already have a Mountain Lion Installer app, downloaded from Apple Store. Now, I would like to install ML on another machine I own. I didn't want to download it again, so I copied the .app to the other machine and try to run. Unfortunately due to some error about mac unable to run the .app I wasn't able to install. Most tutorial suggest to make a bootable USB starting by the installer InstallESD.dmg, found in installer .app. I would like instead to run the .dmg directly. So I have three 'propedeutic' questions: can I just mount and run the .dmg without making a bootable drive ? I do have backup, a TimeCapsule one to be precise. In case of failure, can I just use the previous backup, and restore to Lion 10.7 ? from 'Apple Store point of view', would my machine be recognized as upgraded and elegible for future update ?

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• Windows XP restore point file from disk.

  - by Dragos Toader

  Suppose I copied a Windows XP restore point file to a USB memory stick. I copied C:\System Volume Information\MountPointManagerRemoteDatabase C:\System Volume Information\tracking.log C:\System Volume Information\_restore{45B5E8B9-949A-471E-999D-F381DA56A2D3} C:\System Volume Information\catalog.wci to F:\System Volume Information\ How can I restore this restore point? Can I fool the system into using that file (if I copied it back into the restore point folder)? From F:\System Volume Information\MountPointManagerRemoteDatabase F:\System Volume Information\tracking.log F:\System Volume Information\_restore{45B5E8B9-949A-471E-999D-F381DA56A2D3} F:\System Volume Information\catalog.wci to C:\System Volume Information\

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• Android: How to get a custom view to redraw partially?

  - by Peterdk

  I have a custom view that fills my entire screen. (A piano keyboard) When a user touches the key, it would cause a invalidate() to be called and the whole keyboard gets redrawn to show the new state with a touched key. Currently the view is very simple, but I plan to add a bit more nice graphics. Since the whole keyboard is dynamically rendered this would make redrawing the entire keyboard more expensive. So I thought, let's look into partial redrawing. Now I call invalidate(Rect dirty) with the correct dirty region. I set my onDraw(Canvas canvas) method to only draw the keys in the dirty region if I do indeed want a partial redraw. This results in those keys being drawn, but the rest of the keyboard is totally black/not drawn at all. Am I wrong in expecting that calling invalidate(Rect dirty) would "cache" the current canvas, and only "allows" drawing in the dirty region? Is there any way I can achieve what I want? (A way to "cache" the canvas and only redraw the dirty area?"

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• Troubles Iterating Over A HashMap with JSF, MyFaces & Facelets

  - by Lee Theobald

  Hi all, I'm having some trouble looping over a HashMap to print out it's values to the screen. Could someone double check my code to see what I'm doing wrong. I can't seem to find anything wrong but there must be something. In a servlet, I am adding the following to the request: Map<String, String> facetValues = new HashMap<String, String>(); // Filling the map req.setAttribute(facetField.getName(), facetValues); In one case "facetField.getName()" evaluates to "discipline". So in my page I have the following: <ui:repeat value="${requestScope.discipline}" var="item"> <li>Item: <c:out value="${item}"/>, Key: <c:out value="${item.key}"/>, Value: <c:out value="${item.item}"/></li> </ui:repeat> The loop is ran once but all the outputs are blank?!? I would have at least expected something in item if it's gone over the loop once. Checking the debug popup for Facelets, discipline is there and on the loop. Printing it to the screen results in something that looks like a map to me (I've shortened the output) : {300=0, 1600=0, 200=0, ... , 2200=0} I've also tried with a c:forEach but I'm getting the same results. So does anyone have any ideas where I'm going wrong? Thanks for any input, Lee

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• RegistryKey ValueCount/SubKeyCount wrong

  - by Mark J Miller

  I am trying to query the following registry key values: HKLM\SOFTWARE\Microsoft\MSSQLServer\Client\SharedMemoryOn HKLM\SOFTWARE\Microsoft\MSSQLServer\Client\SuperSocketNetLib\ProtocolOrder But depending on which machine I'm running the program the query returns null. When I debug on my local machine and I inspect the value for ValueCount for: HKLM\SOFTWARE\Microsoft\MSSQLServer\Client HKLM\SOFTWARE\Microsoft\MSSQLServer\Client\SuperSocketNetLib The count is 0 and OpenSubKey returns null. I am a domain admin, in the local administrators group and have added the following to my app.manifest: <requestedExecutionLevel level="requireAdministrator" uiAccess="false" /> Any idea why? private static void ValidateSqlClientSettings() { Console.WriteLine("\r\n/////////////// LOCAL SQL CLIENT PROTOCOLS ////////////////"); RegistryKey keyHKLM = Registry.LocalMachine; ///TODO: nullreferenceexception - connect to remote machine and find out why RegistryKey sqlClientKey = keyHKLM.OpenSubKey(@"SOFTWARE\Microsoft\MSSQLServer\Client"); if (sqlClientKey == null) { WriteLine2Console(@"WARNING: unable to read registry key '{0}\SOFTWARE\Microsoft\MSSQLServer\Client'", ConsoleColor.Yellow); } var cliKeyNames = from k in sqlClientKey.GetSubKeyNames() where k == "SuperSocketNetLib" select k; ///TODO: find out why these values are always missing (even if I can see them in regedit) Console.Write("Shared Memory Disabled (cliconfg): "); if (Convert.ToBoolean(sqlClientKey.GetValue("SharedMemoryOn"))) WriteLine2Console("FAILED", ConsoleColor.Red); else if(sqlClientKey.GetValue("SharedMemoryOn") == null) WriteLine2Console(String.Format("WARNING - unable to read '{0}\\SharedMemoryOn'", sqlClientKey.Name), ConsoleColor.Yellow); else WriteLine2Console("PASS", ConsoleColor.Green); Console.Write("Client Protocol Order (cliconfg - tcp first): "); foreach (string cliKey in cliKeyNames) { RegistryKey subKey = sqlClientKey.OpenSubKey(cliKey); object order = subKey.GetValue("ProtocolOrder"); if (order != null && order.ToString().StartsWith("tcp") == false) { WriteLine2Console("FAILED", ConsoleColor.Red); } else if (order == null) { WriteLine2Console(String.Format("WARNING - unable to read '{0}\\ProtocolOrder'", subKey.Name), ConsoleColor.Yellow); } else { WriteLine2Console("PASS", ConsoleColor.Green); } subKey.Close(); } sqlClientKey.Close(); keyHKLM.Close(); }

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• should this database table be normalized?

  - by oo

  i have taken over a database that stores fitness information and we were having a debate about a certain table and whether it should stay as one table or get broken up into three tables. Today, there is one table called: workouts that has the following fields id, exercise_id, reps, weight, date, person_id So if i did 2 sets of 3 different exercises on one day, i would have 6 records in that table for that day. for example: id, exercise_id, reps, weight, date, person_id 1, 1, 10, 100, 1/1/2010, 10 2, 1, 10, 100, 1/1/2010, 10 3, 1, 10, 100, 1/1/2010, 10 4, 2, 10, 100, 1/1/2010, 10 5, 2, 10, 100, 1/1/2010, 10 6, 2, 10, 100, 1/1/2010, 10 So the question is, given that there is some redundant data (date, personid, exercise_id) in multiple records, should this be normalized to three tables WorkoutSummary: - id - date - person_id WorkoutExercise: - id - workout_id (foreign key into WorkoutSummary) - exercise_id WorkoutSets: - id - workout_exercise_id (foreign key into WorkoutExercise) - reps - weight I would guess the downside is that the queries would be slower after this refactoring as now we would need to join 3 tables to do the same query that had no joins before. The benefit of the refactoring allows up in the future to add new fields at the workout summary level or the exercise level with out adding in more duplication. any feedback on this debate?

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• Configuring Server with no monitor

  - by Scandalist

  Sitting in front of me is an HP DL 380 Generation 4 with no monitor. I'd like to install an OS on the thing but for reasons obvious, I can't. I got excited when I found the ILO port on the back but unless you have a subscription it has limited functionality. I was thinking maybe there was some software out there that booted into some kind of remote access server? When I tested it with a monitor (A friends) I set the BIOS to boot from USB so anything I can load onto a stick should boot. Ideas? Hacks?

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• Sorting HTML table (with anchor tags and data in cells) in Python

  - by AJ

  I have a necessity to sort a given HTML table of the following structure, in Python. <table> <tr> <td><a href="#">ABCD</a></td> <td>A23BND</td> <td><a title="ABCD">345345</td> </tr> <tr> <td><a href="#">EFG</a></td> <td>Add4D</td> <td><a title="EFG">3432</td> </tr> <tr> <td><a href="#">HG</a></td> <td>GJJ778</td> <td><a title="HG">2341333</td> </tr> </table> I am doing something like this: container = tree.findall("tr") strOut = "" data = [] for elem in container: key = elem.findtext(colName) data.append((key, elem)) data.sort() The problem is that it sorts by the text inside the . I want to be able to sort by the anchor value and not href. What can I do to achieve that? Thanks a lot.

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• Proxy doesn't work in HttpClient 4.0 beta2

  - by shrimpy

  Hi,i am useing HttpClient 4.0-beta2, to do rest call, it works fine in my lap-top, but in uni, we have to config our application to go through a proxy, otherwise, we cannot connect to internet Here is my orginal code: HttpClient httpclient = new DefaultHttpClient(); HttpPut put = new HttpPut("http://" + PutBlob.ACCOUNT + ".blob.core.windows.net/container/abc"); put.addHeader(PutBlob.ContentType, PutBlob.CONTENT_TYPE.TEXT_PLAIN.getValue()); put.setEntity(new StringEntity("Hello world", "UTF-8")); Sign(put, PutBlob.ACCOUNT, PutBlob.KEY); log.debug(EntityUtils.toString(httpclient.execute(put).getEntity())); And below is how i use proxy, but it didn`t work for me, what is the right way to config proxy in HttpClient4.0 ??? HttpHost hcProxyHost = new HttpHost("proxyserver", 3128, "http"); DefaultHttpClient httpclient = new DefaultHttpClient(); httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, hcProxyHost); HttpPut put = new HttpPut("/container/abc"); put.addHeader(PutBlob.ContentType, PutBlob.CONTENT_TYPE.TEXT_PLAIN.getValue()); put.setEntity(new StringEntity("Hello world", "UTF-8")); Sign(put, PutBlob.ACCOUNT, PutBlob.KEY); HttpHost target = new HttpHost( PutBlob.ACCOUNT + ".blob.core.windows.net"); log.debug(EntityUtils.toString(httpclient.execute(target, put).getEntity()));

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• Getting FC11 to run under VMware Server, converted from physical machine

  - by Kristian

  I have a FC11 installation that I have converted to a VMware disk image to run om my VMware Server. I converted it with qemu-img, as the VMware Converter software apparently only converts Linux hosts to VMware Infrastructure servers. The disk image boots fine (grub is loaded and boots the kernel) but it seems like the disk is not found by the kernel, and the boot process stalls. Hotplugging USB devices work (the kernel prints debug information) and I'm able to press keys (Ctrl-Alt-Delete for instance). The VMware guest OS is set to RedHat Enterprise Linux 5 (32 bit), and I have tried both the LSI Logic, LSI Logic SAS and VMware Accelerated SCSI SCSI controllers, to no avail. I'm able to boot an installer disk and get into rescue mode and mount the filesystem, so my question is, what do I need to do to the guest kernel / initrd image to make it recognize the virtual disk?

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• Determine between files and folders using cURL

  - by ILMV

  I'm writing a script to download files from an FTP server using cURL + PHP, at the moment I am just trying to build a complete file structure, here's the code I'm using so far: <?php $curl = curl_init(); curl_setopt($curl, CURLOPT_URL, "ftp://www.example.com"); curl_setopt($curl, CURLOPT_USERPWD, "user:pwd"); curl_setopt ($curl, CURLOPT_RETURNTRANSFER, 1) ; curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'NLST'); // or curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'LIST -a'); $ftp=curl_exec($curl); $directory=split("[\n|\r]",$ftp); echo("<pre>".print_r($directory,true)."</pre>"); foreach($directory as $key=>$value) if($value=='') unset($directory[$key]); echo("<pre>".print_r($directory,true)."</pre>"); curl_close ($curl); ?> I can use either NLST or the LIST function, but what I want to do is programatically determine what are files and what are folders. Thanks!

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• Collection is empty when it arrives on the client

  - by digiduck

  One of my entities has an EntitySet< property with [Composition], [Include] and [Association] attributes. I populate this collection in my domain service but when I check its contents when it is received on the client, the collection is empty. I am using Silverlight 4 RTM as well as RIA Services 1.0 RTM. Any ideas what I am doing wrong? Here is the code on my service side: public class RegionDto { public RegionDto() { Cities = new EntitySet<CityDto>(); } [Key] public int Id { get; set; } public string Name { get; set; } [Include] [Composition] [Association("RegionDto_CityDto", "Id", "RegionId")] public EntitySet<CityDto> Cities { get; set; } } public class CityDto { [Key] public int Id { get; set; } public int RegionId { get; set; } public string Name { get; set; } } [EnableClientAccess()] public class RegionDomainService : LinqToEntitiesDomainService<RegionEntities> { public IEnumerable<RegionDto> GetRegions() { var regions = (ObjectContext.Regions .Select(x => new RegionDto { Id = x.ID, Name = x.Name })).ToList(); foreach (var region in regions) { var cities = (ObjectContext.Cities .Where(x => x.RegionID == region.Id) .Select(x => new CityDto { Id = x.ID, Name = x.Name })).ToList(); foreach (var city in cities) { region.Cities.Add(city); } } // each region's Cities collection is populated at this point // however when the client receives it, the Cities collections are all empty return regions; } }

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• PHP cURL JSON Decode (X-AUTH Header)

  - by TheCyX

  <?php // Show Profile $curl = curl_init(); curl_setopt ($curl, CURLOPT_URL, "https://example/api"); curl_setopt ($curl, CURLOPT_RETURNTRANSFER, true); curl_setopt ($curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC ) ; curl_setopt ($curl, CURLOPT_HTTPHEADER, array('X-AUTH: 123456789')); $projects = curl_exec($curl); // This is empty? echo $projects; //Decode $phpArray = json_decode($projects); print_r($phpArray); foreach ($phpArray as $key => $value) { // Line 17, sure its empty, but why? echo "<p>$key | $value</p>"; } ?> Warning: Invalid argument supplied for foreach() in /html/api.php on line 17 The API needs this authentification: $ curl -i -H "X-AUTH: 123456789" https://example/api JSON File: {"id":"123456","hostId":null,"Nickname":"thecyx","DisplayName":"thecyx","AppDisplayName":"thecyx","Score":"300","Account":"Full"} The $project variable is empty. If I'm posting the API Url in the Broswer its working. And, if possible, what's the correct way to get the JSON Data e.g. [Nickname],[Score]?

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• Driverpack Solution makes a whole bunch of programs

  - by Markasoftware

  I am using Driver Pack solution 12.3 to update my drivers. I used it and installed 55 drivers. I noticed that there are now several dozen new entries in add/remove programs under the name Windows Driver Package - Intel hdc, Windows Driver Package - Intel System, and Windows Driver Package - Intel USB with the driverpack solution logo next to them. When I hit uninstall for any of these, it says all devices using this driver will be removed, and I am scared of uninstalling anything I do not know about. I have no system restore points before I updated my driver. Will these extra driver packages slow down my computer or take up extra disk space? Can I uninstall them safely? I am using Windows 8, so refreshing the computer is an option.

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• C# .NET: Descending comparison of a SortedDictionary?

  - by Rosarch

  I'm want a IDictionary<float, foo> that returns the larges values of the key first. private IDictionary<float, foo> layers = new SortedDictionary<float, foo>(new DescendingComparer<float>()); class DescendingComparer<T> : IComparer<T> where T : IComparable<T> { public int Compare(T x, T y) { return -y.CompareTo(x); } } However, this returns values in order of the smallest first. I feel like I'm making a stupid mistake here. Just to see what would happen, I removed the - sign from the comparator: public int Compare(T x, T y) { return y.CompareTo(x); } But I got the same result. This reinforces my intuition that I'm making a stupid error. This is the code that accesses the dictionary: foreach (KeyValuePair<float, foo> kv in sortedLayers) { // ... } UPDATE: This works, but is too slow to call as frequently as I need to call this method: IOrderedEnumerable<KeyValuePair<float, foo>> sortedLayers = layers.OrderByDescending(kv => kv.Key); foreach (KeyValuePair<float, ICollection<IGameObjectController>> kv in sortedLayers) { // ... } UPDATE: I put a break point in the comparator that never gets hit as I add and remove kv pairs from the dictionary. What could this mean?

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• No GUI after upgrade to Ubuntu 9.10 (boots to command line)

  - by Gathris

  I have just upgraded to Ubuntu 9.10 (network upgrade using the update manager, from 9.04 which had different graphics related problems) and when I try to boot into it all I get a small Ubuntu logo, flickering text and then the tty1 command line with a logon prompt. startx gives following error: Fatal server error: no screens found I traced down a tutorial that said I needed the latest graphics drivers (Gigabyte ATI Radeon 4650 HD installed with 9.10 catalyst drivers) so I did using the 'sh' command and a USB stick (I have a working Windows partition) and it installed fine but did not fix the problem. Edit: Thanks to UK and Arjan van Bentem below I was able to understand the full error message of start x: Parse error on lone 2 of /etc/X11/xorg.conf 'nameserver' is not a valid keyword in this section Fatal server error: no screens found This has nothing to do with a graphical error (sorry if I misled anyone) but the xorg.conf file has 3 lines in it and lines 2-3 have an entry 'nameserver'. Using the nano command I commented out (using a # before the entries) the nameservers and can now boot Ubuntu. Thanks to everyone for their help.

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• Subselecting with MDX

  - by Vince

  Greetings stack overflow community. I've recently started building an OLAP cube in SSAS2008 and have gotten stuck. I would be grateful if someone could at least point me towards the right direction. Situation: Two fact tables, same cube. FactCalls holds information about calls made by subscribers, FactTopups holds topup data. Both tables have numerous common dimensions one of them being the Subscriber dimension. FactCalls             FactTopups SubscriberKey      SubscriberKey CallDuration         DateKey CallCost               Topup Value ... What I am trying to achieve is to be able to build FactCalls reports based on distinct subscribers that have topped up their accounts within the last 7 days. What I am basically looking for an MDX equivalent to SQL's: select * from FactCalls where SubscriberKey in ( select distinct SubscriberKey from FactTopups where ... ); I've tried creating a degenerate dimension for both tables containing SubscriberKey and doing: Exist( [Calls Degenerate].[Subscriber Key].Children, [Topups Degenerate].[Subscriber Key].Children ) Without success. Kind regards, Vince

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• Bluetooth not seeing mouse (Fedora)

  - by Chris

  I have a Lenovo S10 'netbook' that I've installed Fedora 17 ("LXDE spin") on. So far pretty much everything works great, except, the on-board Bluetooth. lsusb shows the controller present (0a5c:2101 Broadcom Corp. Bluetooth Controller), hcitool dev shows hci0 present, but when I put my mouse ("Lenovo Bluetooth Laser Mouse," which works perfectly paired with a MacBook Pro, MacBook Air, Mac mini, and Lenovo SL500 (with a USB dongle; running Windows 7)) into pairing mode and run hcitool scan (reports "Scanning ..." and, without further information or error message, returns to the shell prompt), blueman-manager, or bluetooth-wizard (from the gnome-bluetooth package) and try to detect the mouse, I get nothing... Frustrating! Thanks anyone who can point me in the right direction!

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• How to tell what name RIA Services/EF Model uses for Associations?

  - by Nick Gotch

  Hi, I'm working on a C#.NET 3.5 WCF RIA Services app and having an issue with my Entity Framework model. My entity Foo is mapped to a DB table and has a primary key called FooId. My Bar is mapped to a DB view. I've selectively designed this view to generate a composite key in the EF using two of the columns (by making sure they were non-nullable and the others are all nullable. This was done using NULLIF and ISNULL in the view design.) I'm able to add this view to the model with no problem but I keep running into an issue when I try to map an association between the two. Foo should contain many Bars but I keep getting the following error when I add the association: Unable to retrieve AssociationType for association 'FK_Bar_Foo' According to this page, it looks like this might work if I can properly name the association (since RIA Services looks for specific names.) I've tried several variants of names that match the pattern of other associations with no success. Does anyone know if there's a place I can look to find out what name it's looking for? Thanks,

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• MVC Form and Dictionary Type

  - by Brian Schmitt

  I am attempting to use a property on my model that is of type Dictionary<string, string>. This dictionary is one of several other properties on the model, and I am using the dictionary as a key/value store to produce a 'dynamic' form. E.G.: User Name Settings A B I want to be able to submit and save any changes to settings A and B. I can submit the form and get my posted values in all my other fields, however the dictionary gets set to null. <%=Html.LabelFor(m => m.Name)%> <%=Html.DisplayFor(m => m.Name)%> <%=Html.LabelFor(m => m.Settings["A"])%> <%=Html.TextBoxFor(m => m.Settings["A"])%> <%=Html.LabelFor(m => m.Settings["B"])%> <%=Html.TextBoxFor(m => m.Settings["B"])%> Is there a better way to produce the dynamic form with a key/value pair? The actual code will be using partials (there several hundred variations), and the above is only a contrived example.

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• UPS recommendations for three grey boxes?

  - by Margaret

  Hey all We have a series of grey-box style computers acting as servers at my workplace (rather than rack-mount). We were looking to get Uninterruptible Power Supplies for them. However, I'm not sure how many at what capacity are required. I'd assume it would be a good idea to hook the peripherals in as well - there's a 18.5" LCD monitor with a KVM, along with a couple of USB hard drives that require power. I currently have the most vital machine hooked up to a cheap (temporary) UPS, but it's probably close to worse than nothing. I'm looking for reasonable value for money, though I can probably negotiate with my boss on price range. I recognise that I may well need to buy two (or even three) UPSs to support the three machines. Any recommendations?

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• Using the groupby method in Python, example included

  - by randombits

  Trying to work with groupby so that I can group together files that were created on the same day. When I say same day in this case, I mean the dd part in mm/dd/yyyy. So if a file was created on March 1 and April 1, they should be grouped together because the "1" matches. Here's the code I have so far: #!/usr/bin/python import os import datetime from itertools import groupby def created_ymd(fn): ts = os.stat(fn).st_ctime dt = datetime.date.fromtimestamp(ts) return dt.year, dt.month, dt.day def get_files(): files = [] for f in os.listdir(os.getcwd()): if not os.path.isfile(f): continue y,m,d = created_ymd(f) files.append((f, d)) return files files = get_files() for key, group in groupby(files, lambda x: x[1]): for file in group: print "file: %s, date: %s" % (file[0], key) print " " The problem is, I get lots of files that get grouped together based on the day. But then I'll see multiple groups with the same day. Meaning I might have 4 files grouped that were created on the 17th. Later on I'll see another unique set of 2 files that are also created on the 17th. Where am I going wrong?

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• Problem with copying local data onto HDFS on a Hadoop cluster using Amazon EC2/ S3.

  - by Deepak Konidena

  Hi, I have setup a Hadoop cluster containing 5 nodes on Amazon EC2. Now, when i login into the Master node and submit the following command bin/hadoop jar <program>.jar <arg1> <arg2> <path/to/input/file/on/S3> It throws the following errors (not at the same time.) The first error is thrown when i don't replace the slashes with '%2F' and the second is thrown when i replace them with '%2F': 1) Java.lang.IllegalArgumentException: Invalid hostname in URI S3://<ID>:<SECRETKEY>@<BUCKET>/<path-to-inputfile> 2) org.apache.hadoop.fs.S3.S3Exception: org.jets3t.service.S3ServiceException: S3 PUT failed for '/' XML Error Message: The request signature we calculated does not match the signature you provided. check your key and signing method. Note: 1)when i submitted jps to see what tasks were running on the Master, it just showed 1116 NameNode 1699 Jps 1180 JobTracker leaving DataNode and TaskTracker. 2)My Secret key contains two '/' (forward slashes). And i replace them with '%2F' in the S3 URI. PS: The program runs fine on EC2 when run on a single node. Its only when i launch a cluster, i run into issues related to copying data to/from S3 from/to HDFS. And, what does distcp do? Do i need to distribute the data even after i copy the data from S3 to HDFS?(I thought, HDFS took care of that internally) IF you could direct me to a link that explains running Map/reduce programs on a hadoop cluster using Amazon EC2/S3. That would be great. Regards, Deepak.

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