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  • java.io.FileNotFoundException for valid URL

    - by Alexei
    Hello. I use library rome.dev.java.net to fetch RSS. Code is URL feedUrl = new URL("http://planet.rubyonrails.ru/xml/rss"); SyndFeedInput input = new SyndFeedInput(); SyndFeed feed = input.build(new XmlReader(feedUrl)); You can check that http://planet.rubyonrails.ru/xml/rss is valid URL and the page is shown in browser. But I get exception from my application java.io.FileNotFoundException: http://planet.rubyonrails.ru/xml/rss at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1311) at com.sun.syndication.io.XmlReader.<init>(XmlReader.java:237) at com.sun.syndication.io.XmlReader.<init>(XmlReader.java:213) at rssdaemonapp.ValidatorThread.run(ValidatorThread.java:32) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619) I don't use any proxy. I get this exception on my PC and on the production server and only for this URL, other URLs are working.

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  • can't create socket using IO::Socket

    - by Haiyuan Zhang
    when I run the following code, the execution is just hanging there, No response at all. does any of you can tell me what's wrong with the sample code? use strict; use warnings; use IO::Select; use IO::Socket; my $s = new IO::Socket ( LocalPort => 8889, Proto => 'tcp', Listen => 16, Reuse => 1 ); die "could not create socket $!\n" unless $s;

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  • Lua not producing table of functions (IO API)

    - by ArtOfCode
    I'm working on a basic project in Lua. I've been trying to get data from files using the IO API (as defined here), but when I open a file and give it a handle, it doesn't seem to return a table of functions. The (erroneous bit of) code: local unread = fs.list("email/"..from.."/") local send = "" for _,file in ipairs(unread) do local handle = io.open(file,"r") local text = handle:read("*a") send = send .. text .. "\n" handle.close() fs.delete(file) end The fs you see on the first line is a professional filesystem wrapper round the IO API, not my work and perfectly error-free, so that's not the problem. However, when I try to read the file (handle:read()), it throws "attempt to index nil". Tracing it, it turns out that handle itself is nil. Any ideas?

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  • rsync command deletion error "IO error encountered -- skipping file deletion"

    - by Jam88
    I use rsync command to take backup of files from one of my ubuntu server to another ubuntu machine. Backup server trigger a script that use rysnc command. Here is the command I use rsync -rltvh --partial --stats --exclude=.beagle/ --exclude=.* --delete-after root@live_server:/home/ /home/live_server_backup/home /tmp/logfile.log 2&1 live_server is ssh-able without password. So it works. Now problem is with --delete-after option After all file synced .At the end I can see deletion procedure skipped.logfile error is like IO error encountered -- skipping file deletion When i tried to find log there were some error while file sync rsync: send_files failed to open "/home/xyz/Desktop/PPT_session_1_context.pdf": Permission denied (13) So my understanding is as rsync could not read all the files from target for safety reason it is skipping the file deletion. Is there any way to make --delete-after work even if there is some permission error? I do not want to use force deletion as it will be dangerous in some situation.

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  • rsync error unexplained error (code 255) at io.c

    - by kabeer
    I was using a script to perform rsync in sudo crontab. The script does a 2-way rsync (from serverA to serverB and reverse). After i reboot both the server machines, the rsync is not working in sudo crontab. I also setup a new cronjob and it fails, The error is: rsync error: unexplained error (code 255) at io.c(600) [sender=3.0.6] rsync: connection unexpectedly closed (0 bytes received so far) [receiver] However, when run from terminal, the rync script works as expected without issues. please help.

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  • IIS and PHP restrict IO permissions

    - by ULTRA_POROV
    I have php installed trough a fastCGI module. Is there a way to restrict the module (php.exe) read / write permissions to only the directory (+ subdirs) of the IIS site that is calling it? I need this to prevent one IIS PHP site from having access to files outside its own directory. How to do this? Is there a setting in php.ini or in the IIS configuration? I believe such a feature could exist, because when a file on the server is requested the root path of the site is also known, all it would take is that IIS passes this path to the php module, and the php module should on its end allow only IO operations within this path. PS: I know it is possible to achieve this by using a different windows account for each website, this is not an option.

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  • High IO latency on ESXi 4.1 on HP DL580 G7

    - by teddydestodes
    at my Company we were experiencing some weird spikes on IO latency on one of our ESXi instances. we've spend 24h figuring out whats wrong and no clue so far. after giving up we put all the disks into a different server (HP DL380 G7) with much less RAM and only one 6(HT) cores (from 12 on the DL 580) which run fine for about 2 hours. I dont know the specs for the DL380 but both servers have a Smart Array P410i with BBWC (the DL 580 has 1GB) Is it possible that one(or all) of the disks is failing without actually failing?

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  • java.io.EOFException while writing and reading froma servlet

    - by mithun1538
    Hello everyone, I have the following code on the applet side: URL servlet = new URL(appletCodeBase, "FormsServlet?form=requestRoom"); URLConnection con = servlet.openConnection(); con.setDoOutput(true); con.setDoInput(true); con.setUseCaches(false); con.setRequestProperty("Content-Type", "application/octet-stream"); ObjectOutputStream out = new ObjectOutputStream(con.getOutputStream()); out.writeObject(user);//user is an object of a serializable class out.flush(); out.close(); ObjectInputStream in = new ObjectInputStream(con.getInputStream()); status = (String)in.readObject(); in.close(); if("success".equals("status")) { JOptionPane.showMessageDialog(rootPane, "Request submitted successfully."); } else { JOptionPane.showMessageDialog(rootPane, "ERROR! Request cannot be made at this time"); } In the servlet side I recieve the code as follows: form = request.getParameter("form"); if("requestRoom".equals(form)) { String fullName, eID, reason; UserRequestingRoom user; try { in = new ObjectInputStream(request.getInputStream()); user = (UserRequestingRoom)in.readObject(); fullName = user.getFullName(); eID = user.getEID(); reason = user.getReason(); Class.forName("com.mysql.jdbc.Driver"); Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/chat_applet","root",""); PreparedStatement statement = con.prepareStatement("INSERT INTO REQCONFROOM VALUES(\"" + fullName + "\",\"" + eID + "\",\"" + reason + "\")"); statement.execute(); out = new ObjectOutputStream(response.getOutputStream()); out.writeObject("success"); out.flush(); } catch (Exception e) { e.printStackTrace(); out = new ObjectOutputStream(response.getOutputStream()); out.writeObject("fail"); out.flush(); } } When I click on the button that calls the code in the applet side, I get the following error: java.io.EOFException at java.io.ObjectInputStream$PeekInputStream.readFully(Unknown Source) at java.io.ObjectInputStream$BlockDataInputStream.readShort(Unknown Source) at java.io.ObjectInputStream.readStreamHeader(Unknown Source) at java.io.ObjectInputStream.<init>(Unknown Source) at com.org.RequestRoomForm.requestActionPerformed(RequestRoomForm.java:151) **//Line 151 is "ObjectInputStream in..." line in the applet code** at com.org.RequestRoomForm.access$000(RequestRoomForm.java:7) at com.org.RequestRoomForm$1.actionPerformed(RequestRoomForm.java:62) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) Why am I getting this error? I have flushed when I output, I have closed the connections also, yet I get the error. Any reason for this?

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  • Efficient heaps in purely functional languages

    - by Kim
    As an exercise in Haskell, I'm trying to implement heapsort. The heap is usually implemented as an array in imperative languages, but this would be hugely inefficient in purely functional languages. So I've looked at binary heaps, but everything I found so far describes them from an imperative viewpoint and the algorithms presented are hard to translate to a functional setting. How to efficiently implement a heap in a purely functional language such as Haskell? Edit: By efficient I mean it should still be in O(n*log n), but it doesn't have to beat a C program. Also, I'd like to use purely functional programming. What else would be the point of doing it in Haskell?

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  • Looking for Haskell `group` alternative in F#

    - by Heather
    Haskell group descripted there: http://www.haskell.org/ghc/docs/latest/html/libraries/base/Data-List.html#v:group example : group "Mississippi" = ["M","i","ss","i","ss","i","pp","i"] Is there simple F# way of doing it? I can implement something alike let rec sameCounter (data : list<float>) el same (ss : list<float * int>) = if data.Length > (el + 1) then if data.[el] = data.[el + 1] then sameCounter data (el + 1) <| same + 1 <| ss else if same > 0 then sameCounter data (el + 1) <| 0 <| (data.[el], same) :: ss else sameCounter data (el + 1) <| 0 <| ss else ss let group d = sameCounter d 0 0 [] but it's a bit ugly way I think, is there better variant?

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  • What XMonad Configuration Best Replicates Default Ion3 Behavior and Feature Set?

    - by mtp
    Not being very familiar with Haskell and lamenting that Ion 3 is now abandonware, I am curious if anyone out there has found a way of replicating the default Ion 3 behavior and aesthetics in XMonad. If I can't have a near-exact replica of Ion 3-style behavior in XMonad, here is what would be critical to me: Virtual desktops that are empty by default and that spawn full-screen applications, which can be split horizontally or vertically evenly, leaving an empty adjacent pane. The panes, which house open windows, are manually resizable, preferably via keyboard. The panes exhibit tabbed behavior, meaning that they can house multiple windows. Windows can be tagged and moved between panes / virtual desktops via keyboard sequence. A given window may be temporarily exploded into full-screen mode via keyboard sequence. Each new virtual desktop starts in the same state—i.e., with one pane. Each virtual desktop may have its panes divided independently of other virtual desktops. From my investigation, it appears that there are several configurations that provide #3. For as much as I want to spend the time to familiarize myself with Haskell, I just simply don't have time. Any suggestions would be greatly appreciated. As far as I can tell, Ion has no conception of master pane or window, so this behavior is not desired.

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  • iotop for Linux kernel 2.6.18

    - by Lightsauce
    So it has to come to my attention that iotop isn't availalbe for 2.6.18 since it's less than 2.6.20 and requires Python 2.6+. I've done some research and came across this article: http://lserinol.blogspot.com/2009/09/io-usage-per-process-on-linux.html According to this, if these process have io stats in /proc/pid#/io (where pid# is the process #) it's doable regardless of the kernel version. So, in reality, I could upgrade Python to 2.6 and test out iotop. However, my flavor of Linux, CentOS release 5.5 (Final), only supports Python 2.4.3-44.el5 currently. If I were to do uninstall from yum, it doesn't look so pretty. It ends up wanting to uninstall 235 packages, most of which are very important! I read in one place, online (I forget the URL from yesterday), that you can install Python 2.6+ parallel to this one, and have the rpm install for iotop use that. Well, I didn't choose that route. I figured, what the heck, lets write iotop (not copying it, but reverse engineering it without actually looking at it's code/it in use) in bash. I thought it would just grab the /proc/pid#/io file and parse stats. So I wrote a script to grab the top 10 rchar, wchar, read_bytes, and write_bytes by collecting all these stats from all the /proc/pid#/io files, sorting them by each metric, then grabbing the top 10 highest values. The conclusion, the data seems completely useless. Does anybody know any resources for advanced Linux where I can figure out how to take these /proc/pid#/ directories and figure out what the heck they are doing with io on the disk? My main goal is to figure out what exactly is causing high load on my disk. I just know it's on the / partition (/dev/sda2 in this case), and I'm not really sure how to narrow it down without the help of iotop. If I run iostat to grab metrics for 1 minute, every second, the first result it gives me shows a high 'kB_read/s', so that makes me think, it's reading mostly. However, if I watch the update it gives me every second, it's actually just showing values for kB_wrtn/s. This makes me think the initial value iostat gives me is misleading.

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  • Invoking 'Hotkey Mode' in IO Gear's GCS632U KVM Switch

    - by Tim Visher
    Awhile ago I changed the switch port key to left control on my IO Gear USB Switch and I'd like to change it back to Scroll Lock. When I did this, I have some memory of believing that I had found an error in the documentation for the switch regarding how to enter Hotkey Mode. Per the instructions in the manual(PDF), I'm supposed to be able to enter Hotkey Mode by Holding Scroll Lock for 2 seconds, adding Minus on the keypad for one second, and then release Minus first and within a second release Scroll lock. Ignoring the strangeness and fragility of this process, I'm looking for confirmation that this indeed works for anyone else. I can't remember why I thought it was wrong but I clearly remember that I did (I even had a blog post that I was going to write about but it got lost in the sands of time). As an aside, I'd be interested in seeing if there is any way to force a reset for the switch without entering Hotkey Mode as that would do exactly what I'm trying to do and I wouldn't have to mess with Hotkey Mode. Thanks in advance!

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  • High load average, low CPU and IO (Centos 5.7)

    - by Ben
    A Drupal 7 site with CiviCRM, after running smoothly for a year on a 1&1 VPS suddenly became unresponsive. Now pages eventually load, but can take more than a minute. Looking at resource use in Virtuozzo, the load average carries a warning, and has remained above 1. While I understand this isn't particularly high, this is a change from when the site was working. Here is a typical snapshot of top: top - 03:10:32 up 3:21, 1 user, load average: 1.16, 1.22, 1.30 Tasks: 43 total, 1 running, 42 sleeping, 0 stopped, 0 zombie Cpu(s): 0.1%us, 0.1%sy, 0.1%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 2097152k total, 1015112k used, 1082040k free, 0k buffers Swap: 0k total, 0k used, 0k free, 0k cached CPU idle level never seems to go much below 70%. wa is virtually always at 0. There appears to be lots of free memory. And here is some vmstat output, again showign wa at 0, plenty of free memory, and an idle CPU: procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 2 0 0 1100872 0 0 0 0 2783 23672 0 538 1 0 99 0 0 1 0 0 1100872 0 0 0 0 0 16 0 101754 0 0 100 0 0 0 0 0 1100872 0 0 0 0 0 17 0 103133 0 0 100 0 0 0 0 0 1100872 0 0 0 0 0 1 0 102080 0 0 100 0 0 1 0 0 1100872 0 0 0 0 0 6 0 99881 0 0 100 0 0 0 0 0 1100872 0 0 0 0 0 1 0 105187 0 0 100 0 0 I've spoken to 1&1 but they don't have any ideas as to what could be causing the high load average. Instead they suggested an upgrade :) I've looked for processes that might be causing this, examined MySQL showprocesslist, and restarted the container with no result. Does anyone have more troubleshooting suggestions or insights?

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  • Disk IO slow on ESXi, even slower on a VM (freeNAS + iSCSI)

    - by varesa
    I have a server with ESXi 5 and iSCSI attached network storage(4x1Tb Raid-Z on freenas 8.0.4). Those two machines are connected to each other with Gigabit ethernet. The raid-z volume is divided into three parts: two zvols, shared with iscsi, and one directly on top of zfs, shared with nfs and similar. I ssh'd into the freeNAS box, and did some testing on the disks. I used ddto test the third part of the disks (straight on top of ZFS). I copied a 4GB (2x the amount of RAM) block from /dev/zero to the disk, and the speed was 80MB/s. Other of the iSCSI shared zvols is a datastore for the ESXi. I did similar test with time dd .. there. Since the dd there did not give the speed, I divided the amount of data transfered by the time show by time. The result was around 30-40 MB/s. Thats about half of the speed from the freeNAS host! Then I tested the IO on a VM running on the same ESXi host. The VM was a light CentOS 6.0 machine, which was not really doing anything else at that time. There were no other VMs running on the server at the time, and the other two "parts" of the disk array were not used. A similar dd test gave me result of about 15-20 MB/s. That is again about half of the result on a lower level! Of course the is some overhead in raid-z - zfs - zvolume - iSCSI - VMFS - VM, but I don't expect it to be that big. I belive there must be something wrong in my system. I have heard about bad performance of freeNAS's iSCSI, is that it? I have not managed to get any other "big" SAN OS to run on the box (NexentaSTOR, openfiler). Can you see any obvious problems with my setup?

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  • Improving IO with FlashCache

    - by Devator
    I have a server with 2 HDD's (2x 1 TB), running in RAID 1 (SW-RAID). I want to improve IO performance by using flashcache. There are running KVM virtual machines on it, using LVM. Regarding this, I have the following questions: Will this even work? flashcache works for block devices, however these are all virtual machines with their own setup. How much would I expect to increase performance? Most virtual machines run websites and some host games. How big does the SSD needs to be? Would having a bigger SSD increase performance since it's able to cache more files? What happens if the SSD dies? Would flashcache retrieve files from the traditional HDD and I could simply replace the SSD? How much faster would writeback be in comparison with writethrough and writearound? I have no access to a test system unfortunately, so could I install flashcache on a live server without unmounting the the disks? I found a great tutorial here which I would be using.

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  • MySQL is killing the server IO.

    - by OneOfOne
    I manage a fairly large/busy vBulletin forums (running on gigenet cloud), the database is ~ 10 GB (~9 milion posts, ~60 queries per second), lately MySQL have been grinding the disk like there's no tomorrow according to iotop and slowing the site. The last idea I can think of is using replication, but I'm not sure how much that would help and worried about database sync. I'm out of ideas, any tips on how to improve the situation would be highly appreciated. Specs : Debian Lenny 64bit ~12Ghz (6 cores) CPU, 7520gb RAM, 160gb disk. Kernel : 2.6.32-4-amd64 mysqld Ver 5.1.54-0.dotdeb.0 for debian-linux-gnu on x86_64 ((Debian)) Other software: vBulletin 3.8.4 memcached 1.2.2 PHP 5.3.5-0.dotdeb.0 (fpm-fcgi) (built: Jan 7 2011 00:07:27) lighttpd/1.4.28 (ssl) - a light and fast webserver PHP and vBulletin are configured to use memcached. MySQL Settings : [mysqld] key_buffer = 128M max_allowed_packet = 16M thread_cache_size = 8 myisam-recover = BACKUP max_connections = 1024 query_cache_limit = 2M query_cache_size = 128M expire_logs_days = 10 max_binlog_size = 100M key_buffer_size = 128M join_buffer_size = 8M tmp_table_size = 16M max_heap_table_size = 16M table_cache = 96 Other : > vmstat procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 9 0 73140 36336 8968 1859160 0 0 42 15 3 2 6 1 89 5 > /etc/init.d/mysql status Threads: 49 Questions: 252139 Slow queries: 164 Opens: 53573 Flush tables: 1 Open tables: 337 Queries per second avg: 61.302. Edit Additional info.

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  • Distinction between IO error and refusing to authenticate using HTTPService (ActionScript 3.0)

    - by Jonas
    I'm using HTTPService (tried with URLLoader but result is the same) to load XML file. Furthermore, XML file is secured with basic HTTP authentication. There are two kind of events I want to separate: IO Error User refuses to authenticate (pressing cancel on credential request dialog) The problem is that these two kind of events looks exactly the same (401 Status code is not presented). Is there any way to find out whether IO error occurred or authentication failed?

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  • Channels in Socket.io

    - by mat3001
    Hi, I am trying to broadcast a message through the Node.js service socket.io (http://socket.io/) to certain subset of all subscribers. To be more exact, I would like to use channels that users can subscribe to, in order to efficiently push messages to a couple hundred people at the same time. I'm not really sure if addEvent('channel_name',x) is the way to go. I have not found anything in the docs. Any ideas? Thanks Mat

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  • osx sys/io.h not found

    - by ioh
    Hi, I'd like to compile a c programm developed for linux using cc under os x. It includes the header sys/io.h. When compiling I get the error that this file could not be found? Isn't there any sys/io.h header file under os x? Any help would be really appreciated! Thanks!

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  • Asynchronous IO in Java?

    - by thr
    What options for async io (socket-based) are there in java other then java.nio? Also does java.nio use threads in the backround (as I think .NET's async-socket-library does, maybe it's been changed) or is it "true" async io using a proper select call?

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  • Saving objects in servlet session and java.io.NotSerializableException

    - by EugeneP
    SEVERE: IOException while loading persisted sessions: java.io.WriteAbortedException: writi ng aborted; java.io.NotSerializableException: That means this object cannot be persisted on hard disk. Does it imply that it's not safe to keep in Session objects that do not implement "Serializable"? I haven't heard that there are limitations on saving non-serializable objects in Session object. It simply means that Tomcat will always keep them in memory, right?

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  • Saving objects in servlet session and java.io.NotSerializableException

    - by EugeneP
    SEVERE: IOException while loading persisted sessions: java.io.WriteAbortedException: writi ng aborted; java.io.NotSerializableException: That means this object cannot be persisted on hard disk. Does it imply that it's not safe to keep in Session objects that do not implement "Serializable"? I haven't heard that there are limitations on saving non-serializable objects in Session object. It simply means that Tomcat will always keep them in memory, right?

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