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• ESXi v5.5 is having random crashes

  - by Darkmage

  HW: Type: HP Proliant ML350 G5 RAM 22GB CPU 1 x Intel Xenon E5405 2.00GHz OP: ESXi 5.5 just updated from 5.1 to try and fix the crashes occurring on ESXi 5.1 on same hardware. I'm trying to find the error on why one of our servers is crashing, it has had two lock ups in 24 hours now. The internal error light on the front is blinking red, on the inside only "#5 and #6 page 76 manual" the "Processor 2" light "amber" and the "Power" light "green" is shining. in the logs the only errors i can see in the relevant time frame is in log under. Is this the reason? or is there anything else i can do to try and log/locate the error. from zcat syslog.6.gz | less 2014-05-26T11:55:47Z sfcbd[35064]: Error opening socket pair for getProviderContext: Too many open files 2014-05-26T11:55:47Z sfcbd[35064]: Failed to set recv timeout (30) for socket -1. Errno = 9 2014-05-26T11:55:47Z sfcbd[35064]: Failed to set timeout for local socket (e.g. provider) 2014-05-26T11:55:47Z sfcbd[35064]: spGetMsg receiving from -1 35064-9 Bad file descriptor 2014-05-26T11:55:47Z sfcbd[35064]: rcvMsg receiving from -1 35064-9 Bad file descriptor 2014-05-26T11:55:47Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:55:47Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:55:47Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:55:47Z sfcbd[35064]: Error opening socket pair for getProviderContext: Too many open files 2014-05-26T11:55:47Z sfcbd[35064]: Failed to set recv timeout (30) for socket -1. Errno = 9 2014-05-26T11:55:47Z sfcbd[35064]: Failed to set timeout for local socket (e.g. provider) 2014-05-26T11:55:47Z sfcbd[35064]: spGetMsg receiving from -1 35064-9 Bad file descriptor 2014-05-26T11:55:47Z sfcbd[35064]: rcvMsg receiving from -1 35064-9 Bad file descriptor 2014-05-26T11:55:47Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:55:47Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:55:47Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:55:53Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:55:57Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:01Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:04Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:15Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:17Z sfcbd[35064]: Error opening socket pair for getProviderContext: Too many open files 2014-05-26T11:56:17Z sfcbd[35064]: Failed to set recv timeout (30) for socket -1. Errno = 9 2014-05-26T11:56:17Z sfcbd[35064]: Failed to set timeout for local socket (e.g. provider) 2014-05-26T11:56:17Z sfcbd[35064]: spGetMsg receiving from -1 35064-9 Bad file descriptor 2014-05-26T11:56:17Z sfcbd[35064]: rcvMsg receiving from -1 35064-9 Bad file descriptor 2014-05-26T11:56:17Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:17Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:17Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:17Z sfcbd[35064]: Error opening socket pair for getProviderContext: Too many open files 2014-05-26T11:56:17Z sfcbd[35064]: Failed to set recv timeout (30) for socket -1. Errno = 9 2014-05-26T11:56:17Z sfcbd[35064]: Failed to set timeout for local socket (e.g. provider) 2014-05-26T11:56:17Z sfcbd[35064]: spGetMsg receiving from -1 35064-9 Bad file descriptor 2014-05-26T11:56:17Z sfcbd[35064]: rcvMsg receiving from -1 35064-9 Bad file descriptor 2014-05-26T11:56:17Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:17Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:17Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:23Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:27Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:31Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:34Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:34Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:34Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:34Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:34Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:44Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:44Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:44Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:44Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:46Z sfcb-ProviderManager[34828]: SendMsg sending to 1 34828-9 Bad file descriptor 2014-05-26T11:56:48Z sfcbd[35064]: Error opening socket pair for getProviderContext: Too many open files -- manual

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• What makes you look like a bad developer (ie a hacker) [on hold]

  - by user134583

  This comes from a lot of people about me, so I have to look at myself. So I would wonder what make one a bad developer (ie a hacker). These are a few things about me I used IDE intensively, all features, you name it: auto-completion, refactoring, quick fixes, open type, view hierarchy, API documentation, etcc When I deal with writing code for a project in domain I am not used to (I can't have fluency in this, this is new), I only have a very rough high level ideas. I don't use the standard modeling diagrams for early detail planning. Unorthodox diagrams that I invented when I need to draw the design in details. I don't use UML or similar, I find them not enough. I divide the sorts of diagram I drew into 3 types. Very high level diagrams which probably can be understood by almost anybody. Data entity diagram used for modeling data objects only (like ER diagrams and tree for inheritances and composition). Action diagrams for agents/classes and their interactions on data objects they contain. Constantly changing the interface (public methods) between interacting agents/classes if the need arises. I am more refrained when the interface and the module have matured Write initial concept code in a quick hackie way just so that the module works in the general cases so that I can play around with it. The module will be re-factored intensively after playing around so I could see more corner cases that I couldn't or (wouldn't want) anticipate before writing code. Using JUnit for integration-like test by using TestSuite class and ordering Unit test classes in the suite Using debugger almost anytime there is a problem instead of reading the code Constantly search on the internet for how to do some thing with some library that I haven't used a lot. So judgment, am I a bad developer? a hacker? Put in other words, to make sure this is not considered off-topic: - Is this bad practice to make your code too agile during incubating/prototyping phase of software development - Is it bad practice to use JUnit for integration testing, (I know there are other framework for integration testing, but those frameworks are for a specific products, not general)

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• Best/Bad practices for code sharing?

  - by sunpech

  The more I explore Github, the more I like it. I really enjoy how coding is becoming more social. I'm curious as to if there are any bad practices that programmers should avoid in sharing their code with each other. And in naming bad practices, what are the best practices for code sharing? For example: Is it a bad practice for a single repo to have multiple scripts/projects named 'MiscProjects'? Where this repo, as the name suggest, is a collection of miscellaneous small scripts and projects. This may resemble how a programmer organizes projects on his/her local storage, but it's possibly not optimal for code sharing? Maybe if a good README/documentation is done, it would be better? Or as long as it's well documented, anything goes?

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• Even EA's Have Bad Days - it's Time to Reset

  - by Pat Shepherd

  I saw this article and thought I'd share it because, even we EA's have bad days and the 7 points listed are a great way for you to hit the "reset" button. From Geoffrey James on INC.COM, here are 7 ways to change your view of things when, say, you are hitting a frustration point coordinating stakeholders to agree on an approach (never happens, right?) Positive Thinking: 7 Easy Ways to Improve a Bad Day http://www.inc.com/geoffrey-james/positive-thinking-7-easy-ways-to-improve-a-bad-day.html To paraphrase:          You can decide (in an instant) to change patterns of the past          Believe in (or even visualize) good things happening, and they will          Keep a healthy perspective on the work-life / life-life continuum (what things REALLY matter in the big scheme of things)                  Focus on the good (the laws of positive-attraction apply)

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• Robots.txt and "Bad" Robots

  - by Lynda

  I understand robots.txt and its purpose. I have read some people saying that using a Robots.txt gives "bad" robots or robots who do not obey a robots.txt a way to access pages on your site that you do not want accessed. While I am not looking to get into a debate about that I do have a question: If I have a structure like this: /Folder/ /Sub-Folder 1/ /Sub-Folder 2/ (Note: There are no pages within /Folder/ only other folders.) If I Disallow: /Folder/ it will prevent "good" robots from accessing the directory and any contents within the sub-folders. While we know that bad robots will see the /Folder/ will they be able to see and acess the sub-folders and the pages within the subfolders if they are not listed in the robots.txt? (Note: I do not fully understand how robots good or bad crawl a site beyond using a robots.txt and links within the site.)

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• how to ask questions about bad practices in stackoverflow ( or other technical forums) [migrated]

  - by Nahum Litvin

  I had a case when I needed to do something in code that I knew is a bad practice. but because of a unique situation and after considering the risks thoroughly decided that is worth it. I cannot start explaining all my considerations that include buisness secrets over the internet but I do need technical assistance. when I tried to ask at SA I got heated responses why it is a bad practice instead of answeres to how to do this. poeple are so conserned about what is the right way to write code that they forget that there are other considerations as well. can anyone provide insight of how to correctly ask such a question in order to avoid "this is a bad practice" answers and get real answers?

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• Bad Bot blocking Revisited

  - by Tom

  I've read a lot about bad bot blocking, php scripts, .htaccess techniques, etc... Is this a valid method? Since .htacces can rewrite and send a bad bot a 403 deny or forward to something like spam poison, is it possible to Disallow a folder, then through .htaccess in that specific folder redirect to spampoison? Since Apache reads each .htaccess independently and follows specific instructions, then a bad bot not following robots.txt would just be redirected. Or anyone trying to access, /badbot/ or whatever I choose to call my trap folder. Thanks Tom

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• Is commented out code really always bad?

  - by nikie

  Practically every text on code quality I've read agrees that commented out code is a bad thing. The usual example is that someone changed a line of code and left the old line there as a comment, apparently to confuse people who read the code later on. Of course, that's a bad thing. But I often find myself leaving commented out code in another situation: I write a computational-geometry or image processing algorithm. To understand this kind of code, and to find potential bugs in it, it's often very helpful to display intermediate results (e.g. draw a set of points to the screen or save a bitmap file). Looking at these values in the debugger usually means looking at a wall of numbers (coordinates, raw pixel values). Not very helpful. Writing a debugger visualizer every time would be overkill. I don't want to leave the visualization code in the final product (it hurts performance, and usually just confuses the end user), but I don't want to loose it, either. In C++, I can use #ifdef to conditionally compile that code, but I don't see much differnce between this: /* // Debug Visualization: draw set of found interest points for (int i=0; i<count; i++) DrawBox(pts[i].X, pts[i].Y, 5,5); */ and this: #ifdef DEBUG_VISUALIZATION_DRAW_INTEREST_POINTS for (int i=0; i<count; i++) DrawBox(pts[i].X, pts[i].Y, 5,5); #endif So, most of the time, I just leave the visualization code commented out, with a comment saying what is being visualized. When I read the code a year later, I'm usually happy I can just uncomment the visualization code and literally "see what's going on". Should I feel bad about that? Why? Is there a superior solution? Update: S. Lott asks in a comment Are you somehow "over-generalizing" all commented code to include debugging as well as senseless, obsolete code? Why are you making that overly-generalized conclusion? I recently read Robert Glass' "Clean Code", which says: Few practices are as odious as commenting-out code. Don't do this!. I've looked at the paragraph in the book again (p. 68), there's no qualification, no distinction made between different reasons for commenting out code. So I wondered if this rule is over-generalizing (or if I misunderstood the book) or if what I do is bad practice, for some reason I didn't know.

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• Is there something better than a StringBuilder for big blocks of SQL in the code

  - by Eduardo Molteni

  I'm just tired of making a big SQL statement, test it, and then paste the SQL into the code and adding all the sqlstmt.append(" at the beginning and the ") at the end. It's 2011, isn't there a better way the handle a big chunk of strings inside code? Please: don't suggest stored procedures or ORMs. edit Found the answer using XML literals and CData. Thanks to all the people that actually tried to answer the question without questioning me for not using ORM, SPs and using VB edit 2 the question leave me thinking that languages could try to make a better effort for using inline SQL with color syntax, etc. It will be cheaper that developing Linq2SQL. Just something like: dim sql = <sql> SELECT * ... </sql>

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• Index independent character comparison within text blocks

  - by Michael IV

  I have the following task: developing a program where there is a block of sample text which should be typed by user. Any typos the user does during the test are registered. Basically, I can compare each typed char with the sample char based on caret index position of the input, but there is one significant flaw in such a "naive" approach. If the user typed mistakenly more letters than a whole string has, or inserted more white spaces between the string than should be, then the rest of the comparisons will be wrong because of the index offsets added by the additional wrong insertions. I have thought of designing some kind of parser where each string (or even a char ) is tokenized and the comparisons are made "char-wise" and not "index-wise," but that seems to me like an overkill for such a task. I would like to get a reference to possibly existing algorithms which can be helpful in solving this kind of problem.

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• USB blocks suspend on a Gigabyte GA-890GPA-UD3H with ATI SB700/SB800

  - by poolie

  Following on from question 12397, I'd still like to get suspend working on my Phenom II X6 / GA-890GPA desktop machine running current Maverick. When I run pmi action suspend the machine doesn't crash, but it also doesn't suspend. The kernel logs show: PM: Syncing filesystems ... done. PM: Preparing system for mem sleep Freezing user space processes ... (elapsed 0.02 seconds) done. Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done. PM: Entering mem sleep Suspending console(s) (use no_console_suspend to debug) pm_op(): usb_dev_suspend+0x0/0x20 returns -2 PM: Device usb8 failed to suspend async: error -2 PM: Some devices failed to suspend PM: resume of devices complete after 0.430 msecs PM: resume devices took 0.000 seconds PM: Finishing wakeup. Restarting tasks ... done. PM: Syncing filesystems ... I've tried disconnecting all the USB devices, and then connecting in to run pmi over ssh, and I get the same failure. With everything unplugged, I see the following usb devices: Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub and lspci shows the physical devices are: 00:12.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller 00:12.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller 00:13.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller 00:13.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller 00:14.5 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI2 Controller 00:16.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller 00:16.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller 02:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 03) Booting with no_console_suspend makes no difference.

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• "Viral" license that only blocks legal actions of user and developer against each other

  - by Lukasz Zaroda

  I was thinking a lot about software licensing lately, because I would like to do some coding. I'm not an expert in all those licenses, so I came up with my own idea, and before I will put in on paper, I would like to make sure that I didn't reinvent a wheel, so maybe I would be able to use something that exists. Main idea behind my license is to guarantee freedom of use the software, but not "freedom to" (positive) (e.g. freedom to having source code), but "freedom from" (negative) (strictly from legal actions against you). It would be "viral" copyleft license. You would be able to without fear do everything you want with the software (and binaries e.g. reverse engineering), as long as You will include information about author and/or authors, and all derivative works will be distributed with the same license. I'm not interested in anything that would restrict a freedom of company to do something like "tivoization". I'm just trying to accomplish something that would block any legal actions of user and developer, targeted against each other, with the exception of basic attribution. Does exist something like that?

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• OS8- AK8- The bad news...

  - by Steve Tunstall

  Ok I told you I would give you the bad news of AK8 to go along with all the cool new stuff, so here it is. It's not that bad, really, just things you need to be aware of. First, the 2013.1 code is being called OS8, AK8 and 2013.1 by different people. I mean different people INSIDE Oracle!! It was supposed to be easy, but it never is. So for the rest of this blog entry, I'm calling it AK8. AK8 is not compatible with the 7x10 series. Ever. The 7x10 series is not supported with AK8, and if you try to upgrade one, it will fail at the healthcheck. All 7x20 series, all of them regardless of age, are supported with AK8. Drive trays. Let's talk about drive trays and SAS cards. The older drive trays for the 7x20 series were called the "Riverwalk 2" or "DS2" trays. They were technically the "J4410" series JBODs that Sun used to sell a la carte before we stopped selling JBODs. Don't get me started on that, it still makes me mad. We used these for many years, and you can still buy them right now until December 15th, 2013, when they will no longer be sold. The DS2 tray only came as a 4u, 24 drive shelf. It held 3.5" drives, and you had a choice of 2TB, 3TB, 300GB or 600GB drives. The SAS HBA in the 7x20 series was called a "Thebe" card, with a part # of 7105394. The 7420, for example, came standard with two of these "Thebe" cards for connecting to the disk trays. Two Thebe cards could handle up to 12 trays, so one would add two more cards to go to 24 trays, or have up to six Thebe cards to handle 36 trays. This card was for external SAS only. It did not connect to the internal OS drives or the Readzillas, both of which used the internal SCSI controller of the server. These Riverwalk 2 trays ARE supported with AK8. You can upgrade your older 7420 or 7320, no problem, as-is. The much older Riverwalk 1 trays or J4400 trays are NOT supported by AK8. However, they were only used by the 7x10 series, and we already said that the 7x10 series was not supported. Here's where it gets tricky. Since last January, we have been selling the new style disk trays. We call them the "DE2-24P" and the "DE2-24C" trays. The "C" tray is for capacity drives, which are 3.5" 3TB or 4TB drives. The "P" trays are for performance drives, which are 2.5" 300GB and 900GB drives. These trays are NOT Riverwalk 2 trays, even though the "C" series may kind of look like it. Different manufacturer and different firmware. They are not new. Like I said, we've been selling them with the 7x20 series since last January. They are the only disk trays we will be selling going forward. Of course, AK8 supports them. So what's the problem? The problem is going to be for people who have to mix drive trays. Remember, your older 7x20 series has Thebe SAS2 HBAs. These have 2 SAS ports per card.  The new ZS3-2 and ZS3-4 systems, however, have the new "Thebe2" SAS2 HBAs. These Thebe2 cards have 4 ports per card. This is very cool, as we can now do more SAS channels with less cards. Instead of needing 4 SAS cards to grow to 24 trays like we did with the old Thebe cards, I can now do 24 trays with only 2 Thebe2 cards. This means more IO slots for fun things like Infiniband and 10G. So far, so good, right? These Thebe2 cards work with any disk tray. You can even mix older DS2 trays with the newer DE2 trays in the same system, as long as you have Thebe2 cards. Ah, there's your problem. You don't have Thebe2 cards in your old 7420, do you? Well, I told you the bad news wasn't that bad, right? We can take out your Thebe cards and replace them with Thebe2. You can then plug your older DS2 trays right back in, and also now get newer DE2 trays going forward. However, it's important that the trays are on different SAS channels. You can mix them in the same system, but not on the same channel. Ask your local SC if you need help with the new cable layout. By the way, the new ZS3-2 and ZS3-4 systems also include a new IO card called "Erie" cards. These are for INTERNAL SAS to the OS drives and the Readzillas. So those are now SAS2 instead of SATA like the older models. Yes, the Erie card uses an IO slot, but that's OK, because the Thebe2 cards allow us to use less SAS HBAs to grow the system, right? That's it. Not too much bad news and really not that bad. AK8 does not support the 7x10 series, and you may need new Thebe2 cards in your older systems if you want to add on newer DE2 trays. I think we can all agree that there are worse things out there. Like our Congress.   Next up.... More good news and cool AK8 tricks. Such as virtual NICS. 

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• Which JavaScript carousel zooms blocks from the playlist?

  - by Iain Hallam

  I saw a carousel/slider for displaying featured content a while ago that does something that most don't. It started fairly simply, with the top feature large, and a playlist to the side of other featured stories: Feature 1 then began to slide towards the bottom right, while feature 2 moved to occupy the main slot, and the previews of features 3 and 4 moved up: The slider had now completed a whole swap, and was ready to do the same thing with feature 3. My Google-fu seems to be lacking in finding this again; does anyone know of this slider? I think it was based on one of the frameworks, but I'm not sure whether it was jQuery or one of the others.

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• Week in Geek: SkyDrive Bug Blocks Opera Browser Users from the Service

  - by Asian Angel

  Our latest edition of WIG is filled with news link coverage on topics such as how the FBI and CIA can read your e-mail, Blizzard admits to wrongfully banning a Diablo 3 Linux user and refunds his money, e-mailed malware disguised as group coupon offers are increasing, and more. Chainlink clipart courtesy of For Web Designer. How To Delete, Move, or Rename Locked Files in Windows HTG Explains: Why Screen Savers Are No Longer Necessary 6 Ways Windows 8 Is More Secure Than Windows 7

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• The package is of bad quality - google chrome

  - by hafichuk

  I'm doing a fresh install of 12.10 and am trying to install Google Chrome. I've downloaded the deb from http://chrome.google.com and am installing it through the Ubuntu Software Centre. I'm getting a message: The package is of bad quality (same as What is a "bad quality" package?) In the expanded section, the "error" states: E: google-chrome-stable: file-in-etc-not-marked-as-conffile etc/cron.daily/google-chrome Is it safe to click on the "Ignore and Install" button?

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• SEO Hosting & the Importance of C Class IP Blocks

  The era of Pagerank is not dead and link popularity still counts towards the overall ranking of a website in any industry vertical. Long tail of search still gets powered from on-page optimization but for most of the traffic bearing terms, search engines hardly go in for the text databases.

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• What Did You Do? is a Bad Question

  - by Ajarn Mark Caldwell

  Brian Moran (blog | Twitter) did a great presentation today for the PASS Professional Development Virtual Chapter on The Art of Questions.  One of the points that Brian made was that there are good questions and bad (or at least not-as-good) questions.  Good questions tend to open-up the conversation and engender positive reactions (perhaps even trust and respect) between the participants; and bad questions tend to close-down a conversation either through the narrow list of possible responses (e.g. strictly Yes/No) or through the negative reactions they can produce.  And this explains why I so frequently had problems troubleshooting real-time problems with users in the past.  I’ll explain that in more detail below, but before we go on, let me recommend that you watch the recording of Brian’s presentation to learn why the question Why is often problematic in the U.S. and yet we so often resort to it. For a short portion (3 years) of my career, I taught basic computer skills and Office applications in an adult vocational school, and this gave me ample opportunity to do live troubleshooting of user challenges with computers.  And like many people who ended up in computer related jobs, I also have had numerous times where I was called upon by less computer-savvy individuals to help them with some challenge they were having, whether it was part of my job or not.  One of the things that I noticed, especially during my time as a teacher, was that when I was helping somebody, typically the first question I would ask them was, “What did you do?”  This seemed to me like a good way to start my detective work trying to figure out what happened, what went wrong, how to fix it, and how to help the person avoid it again in the future.  I always asked it in a polite tone of voice as I was just trying to gather the facts before diving in deeper.  However; 99.999% of the time, I always got the same answer, “Nothing!”  For a long time this frustrated me because (remember I’m in detective mode at that point) I knew it could not possibly be true.  They HAD to have done SOMETHING…just tell me what were the last actions you took before this problem presented itself.  But no, they always stuck with “Nothing”.  At which point, with frustration growing, and not a little bit of disdain for their lack of helpfulness, I would usually ask them to move aside while I took over their machine and got them out of whatever they had gotten themselves into.  After a while I just grew used to the fact that this was the answer I would usually receive, but I always kept asking because for the .001% of the people who would actually tell me, I could then help them understand what went wrong and how to avoid it in the future. Now, after hearing Brian’s talk, I understand what the problem was.  Even though I meant to just be in an information gathering mode, the words I was using, “What did YOU do?” have such a strong negative connotation that people would instinctively go into defense-mode and stop sharing information that might make them look bad.  Many of them probably were not even consciously aware that they had gone on the defensive, but the self-preservation instinct, especially self-preservation of the ego, is so strong that people would end up there without even realizing it. So, if “What did you do” is a bad question, what would have been better?  Well, one suggestion that Brian makes in his talk is something along the lines of, “Can you tell me what led up to this?” or “what was happening on the computer right before this came up?”  It’s subtle, but the point is to take the focus off of the person and their behavior; instead depersonalizing it and talk about events from more of a 3rd-party observer point of view.  With this approach, people will be more likely to talk about what the computer did and what they did in response to it without feeling the interrogation spotlight is on them.  They are also more likely to mention other events that occurred around the same time that may or may not be related, but which could certainly help you troubleshoot a larger problem if it is not just user actions.  And that is the ultimate goal of your asking the questions.  So yes, it does matter how you ask the question; and there are such things as good questions and bad questions.  Excellent topic Brian!  Thanks for getting the thinking gears churning! (Cross-posted to the Professional Development Virtual Chapter blog.)

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• How to get the blocks seen by the player?

  - by m4tx

  I'm writing a Minecraft-like game using Ogre engine and I have a problem. I must optimize my game, because when I try draw 10000 blocks, I have 2 FPS... So, I got the idea that blocks display of the plane and to hide the invisible blocks. But I have a problem - how do I know which blocks at a time are visible to the player? And - if you know of other optimization methods for such a game, write what and how to use them in Ogre.

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• How to get the blocks seen by the player?

  - by m4tx

  I'm writing a Minecraft-like game using Ogre engine and I have a problem. I must optimize my game, because when I try draw 10000 blocks, I have 2 FPS... So, I got the idea that blocks display of the plane and to hide the invisible blocks. But I have a problem - how do I know which blocks at a time are visible to the player? And - if you know of other optimization methods for such a game, write what and how to use them in Ogre.

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• Disaster After Removing Two HDD From LaCie RAID 0 Case

  - by John

  This is the second time this has happened. I own a LaCie IDE RAID 0 Enclosure and the RAID went bad. The system gave me a warning that the data could be read from the RAID but that nothing could be written, and to remove the data ASAP. I did that and erased and reinitialized the RAID. System reported it was fine, no issues. I wrote to the RAID again and the system reported the same issue. So, I removed the drives and tested them individually thinking one must have gone bad. Sure enough, one HDD reported all bad blocks, every single one after the Master Boot Record. I didn't think much about it because of the age of the drives, 5 years old. So, I bought two new drives plugged them in and started up the RAID again. Exactly the same thing happened. All was fine after initializing the RAID and then the next day after powering on the RAID the exact same issue. The HDD sitting in the same position as the first "bad" HDD reported all bad blocks. Obviously, this is an issue with LaCie's bridge board not with the drives. No utility I have used has been able to bring this HDD back to life. I thought I would just copy the MBR from the good drive to the new one using a sector editor but am hesitant. Is it possible the firmware on the HDD has been corrupted by the LaCie bridge board?? What else could be the cause of such an issue? How can I fix this drive?

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• Uploading file > 1 MB on Django admin gives 400 Bad Request response.

  - by ayaz

  I have a small Django (1.2.x) project deployed on Apache (2.x) via mod_wsgi (2.x). In the admin, if I upload a file < 1MB, I can get it through; however, for a file, say, 1.2MB in size, I get a 400 response from the server with "Error 400" in the body only. I am wondering why this is happening. As far as I can see, there is no LimitRequestBody set in Apache configuration. I have tried uploading with several browsers including: Firefox, Chrome, and Safari. In the log file for Apache, there is apparently no entry for requests that gave the 400 error response. This is strange. I should point out that the scenario where this is happening is thus: The project in question is deployed on two identical Apache servers (completely identical setup) that are behind a load balancer. On my development setup, of course, the problem does not surface. Any help with this will be very much appreciated.

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• Bad style programming, am I pretending too much?

  - by Luca

  I realized to work in an office with a quite bad code base. The base library implemented in years and years is quite limited, and most of that code is, honestly, horrible. Projects developed in the office are very large. Fine. I could define me a "perfectionist" (but often I'm not), and I thought to refactor an application (really a portion), which need a new (complex) feature. But, today, I really realized that it's not possible to refactor that application modules with a reasonable time (say, 24/26 hours, respect the avaialable time for the task, which is 160 hours). I'm talking about (I am a bit ashamed to say) name collisions, large and frequent cut & paste code, horrible and misleading naming, makefiles without dependencies (!), application login is spread randomly across many different sources, dead code, variable aliasing, no assertion, no documentation, very long source files, bad/incomplete include file definition, (this is emblematic!) very frequent extern declaration of variables and functions, ... I'm sure to continue ... buffer overflows because sprintf, indentation (!), spacing, non existent const modifier usage. I would say that every source line was written quite randomly when needed, without keeping in mind some design (at least, the obvious one). (Am I in hell?) The problem arises when the application is developed by a colleague of mine. I felt very frustrated. So, I decided to expose the "situation" to my colleague; at the end, that was a bad idea. He is justified in saying that "the application was developed in haste, so it is natural that it is written vaguely; you are wasting time to think and implement an elegant implementation" .... I'm asking too much from my colleague to write readable code, which is managed and documented? I expect too much in not having to read thousands of lines of code to understand how a particular logic?

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• Are long methods always bad?

  - by wobbily_col

  So looking around earlier I noticed some comments about long methods being bad practice. I am not sure I always agree that long methods are bad (and would like opinions from others). For example I have some Django views that do a bit of processing of the objects before sending them to the view, a long method being 350 lines of code. I have my code written so that it deals with the paramaters - sorting / filtering the queryset, then bit by bit does some processing on the objects my query has returned. So the processing is mainly conditional aggregation, that has complex enough rules it can't easily be done in the database, so I have some variables declared outside the main loop then get altered during the loop. varaible_1 = 0 variable_2 = 0 for object in queryset : if object.condition_condition_a and variable_2 > 0 : variable 1+= 1 ..... ... . more conditions to alter the variables return queryset, and context So according to the theory I should factor out all the code into smaller methods, so That I have the view method as being maximum one page long. However having worked on various code bases in the past, I sometimes find it makes the code less readable, when you need to constantly jump from one method to the next figuring out all the parts of it, while keeping the outermost method in your head. I find that having a long method that is well formatted, you can see the logic more easily, as it isn't getting hidden away in inner methods. I could factor out the code into smaller methods, but often there is is an inner loop being used for two or three things, so it would result in more complex code, or methods that don't do one thing but two or three (alternatively I could repeat inner loops for each task, but then there will be a performance hit). So is there a case that long methods are not always bad? Is there always a case for writing methods, when they will only be used in one place?

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• Understanding 400 Bad Request Exception

  - by imran_ku07

      Introduction:          Why I am getting this exception? What is the cause of this error. Developers are always curious to know the root cause of an exception, even though they found the solution from elsewhere. So what is the reason of this exception (400 Bad Request).The answer is security. Security is an important feature for any application. ASP.NET try to his best to give you more secure application environment as possible. One important security feature is related to URLs. Because there are various ways a hacker can try to access server resource. Therefore it is important to make your application as secure as possible. Fortunately, ASP.NET provides this security by throwing an exception of Bad Request whenever he feels. In this Article I am try to present when ASP.NET feels to throw this exception. You will also see some new ASP.NET 4 features which gives developers some control on this situation.   Description:   http.sys Restrictions:           It is interesting to note that after deploying your application on windows server that runs IIS 6 or higher, the first receptionist of HTTP request is the kernel mode HTTP driver: http.sys. Therefore for completing your request successfully you need to present your validity to http.sys and must pass the http.sys restriction.           Every http request URL must not contain any character from ASCII range of 0x00 to 0x1F, because they are not printable. These characters are invalid because these are invalid URL characters as defined in RFC 2396 of the IETF. But a question may arise that how it is possible to send unprintable character. The answer is that when you send your request from your application in binary format.           Another restriction is on the size of the request. A request containg protocal, server name, headers, query string information and individual headers sent along with the request must not exceed 16KB. Also individual header should not exceed 16KB.           Any individual path segment (the portion of the URL that does not include protocol, server name, and query string, for example, http://a/b/c?d=e,  here the b and c are individual path) must not contain more than 260 characters. Also http.sys disallows URLs that have more than 255 path segments.           If any of the above rules are not follow then you will get 400 Bad Request Exception. The reason for this restriction is due to hack attacks against web servers involve encoding the URL with different character representations.           You can change the default behavior enforced by http.sys using some Registry switches present at HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HTTP\Parameters    ASP.NET Restrictions:           After passing the restrictions enforced by the kernel mode http.sys then the request is handed off to IIS and then to ASP.NET engine and then again request has to pass some restriction from ASP.NET in order to complete it successfully.           ASP.NET only allows URL path lengths to 260 characters(only paths, for example http://a/b/c/d, here path is from a to d). This means that if you have long paths containing 261 characters then you will get the Bad Request exception. This is due to NTFS file-path limit.           Another restriction is that which characters can be used in URL path portion.You can use any characters except some characters because they are called invalid characters in path. Here are some of these invalid character in the path portion of a URL, <,>,*,%,&,:,\,?. For confirming this just right click on your Solution Explorer and Add New Folder and name this File to any of the above character, you will get the message. Files or folders cannot be empty strings nor they contain only '.' or have any of the following characters.....            For checking the above situation i have created a Web Application and put Default.aspx inside A%A folder (created from windows explorer), then navigate to, http://localhost:1234/A%25A/Default.aspx, what i get response from server is the Bad Request exception. The reason is that %25 is the % character which is invalid URL path character in ASP.NET. However you can use these characters in query string.           The reason for these restrictions are due to security, for example with the help of % you can double encode the URL path portion and : is used to get some specific resource from server.   New ASP.NET 4 Features:           It is worth to discuss the new ASP.NET 4 features that provides some control in the hand of developer. Previously we are restricted to 260 characters path length and restricted to not use some of characters, means these characters cannot become the part of the URL path segment.           You can configure maxRequestPathLength and maxQueryStringLength to allow longer or shorter paths and query strings. You can also customize set of invalid character using requestPathInvalidChars, under httpruntime element. This may be the good news for someone who needs to use some above character in their application which was invalid in previous versions. You can find further detail about new ASP.NET features about URL at here           Note that the above new ASP.NET settings will not effect http.sys. This means that you have pass the restriction of http.sys before ASP.NET ever come in to the action. Note also that previous restriction of http.sys is applied on individual path and maxRequestPathLength is applied on the complete path (the portion of the URL that does not include protocol, server name, and query string). For example, if URL is http://a/b/c/d?e=f, then maxRequestPathLength will takes, a/b/c/d, into account while http.sys will take a, b, c individually.   Summary:           Hopefully this will helps you to know how some of initial security features comes in to play, but i also recommend that you should read (at least first chapter called Initial Phases of a Web Request of) Professional ASP.NET 2.0 Security, Membership, and Role Management by Stefan Schackow. This is really a nice book.

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