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  • Usecase for Workflow Engine

    - by Icarus
    Hi, We have an issue where a Database table has to be updated on the status for a particular entity. Presently, its all Java code with a lot of if conditions and an update to the status. I was thinking along lines of using a Workflow engine since there can be multiple flows in future. Is it an overkill to use a Workflow Engine here... where do you draw the line ?

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  • Sun Grid Engine (SGE) Jobs Not Visible After Adding virtual_free

    - by Gary Richardson
    I'm trying to to use virtual_free to limit the number of large memory jobs running each grid node in my cluster. This seems to be working as expected. After I modified my code to submit jobs with the memory instances, qstat -f -q $queueName no longer shows a list of jobs waiting for a slot. The jobs are submitted with a specific queue (-q $queueName). I'm guessing this is happening due to the magic of SGE queue selection. Is there a way to make my jobs show up as before? Thanks! UPDATE I'm using: qstat -f -u * -q $queueName to view the queue. If I drop the queue argument, I can see the jobs. If I examine a specific job, I can see that it has the correct hard_queue_list value set. I'm also using Sun Grid Engine 6.1u4

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  • Ajax Push Engine

    - by gkrdvl
    Hi all, are there anyone hear about APE (Ajax Push Engine) before ? I'm building Rails application and trying to create group chat with this APE realtime engine, the problem is how to make Rails communicate with APE Server ? Are there any tutorial or reference on working APE with Rails ?

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  • MySQL Server - Got error -1 from storage engine

    - by Bobby
    I am currently trying to restore a MySQL table from the .ibd file. I have been following the instructions on the MySQL reference manual on how to use DISCARD and IMPORT TABLESPACE to replace the .idb files. Discarding the tablespace returns no error and the file is deleted however IMPORTING the replacement .ibd file yields a "Got error -1 from storage engine" error. There doesn't seem to be too much information about what exactly an error -1 is. Does anybody have any further insight as to why an import table space isn't working?

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  • Strange error from mysql storage engine

    - by zerkms
    General error: 1030 Got error -1 from storage engine the used storage engine is innodb the query was runned when i got it today morning was: SELECT feeds.* FROM feeds ORDER BY RAND() LIMIT 1 i know rand() is bad but it's very small table (<500 records) and not loaded project this error i receive approximately once a day. cannot google anything relevant :-(

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  • Unknown/unsupported storage engine: InnoDB | Mysql Ubuntu

    - by Kayle
    I recently upgraded from the previous LTS Ubuntu to Precise and now mysql refuses to start. It complains of the following when I attempt to start it: ?$ sudo service mysql restart stop: Unknown instance: start: Job failed to start And this shows in "/var/log/mysql/error.log": 120415 23:01:09 [Note] Plugin 'InnoDB' is disabled. 120415 23:01:09 [Note] Plugin 'FEDERATED' is disabled. 120415 23:01:09 [ERROR] Unknown/unsupported storage engine: InnoDB 120415 23:01:09 [ERROR] Aborting 120415 23:01:09 [Note] /usr/sbin/mysqld: Shutdown complete I've checked permissions on all the mysql directories to make sure it had ownership and I also renamed the previou ib_logs so that it could remake them. I'm just getting no where with this issue right now, after looking at google results for 2 hours.

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  • Specify database engine to use in fixtures

    - by deceze
    Is there a way to specify the database engine to be used for fixtures in CakePHP test fixtures? Some of my models depend on database transactions, and I would like to write some tests for their correct behavior. Currently I'm simply auto-importing the schema, but the tables get created with MySQL's standard MyISAM engine, which doesn't support transactions. class FooFixture extends CakeTestFixture { public $name = 'Foo'; public $import = 'Foo'; public $records = array(...); }

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  • Authorization engine in java

    - by eltados
    In the course of my work i need to develop an authorization engine ( i'm already authenticated and i check access of a user to an action ) in order to store all the authorization logic inside a same place and be able to reuse it and i have created the mini library. http://github.com/eltados/canny what do you think about it? Is there any lightweight Authorization engine library i could have a look at?

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  • How do i know if a mysql table is using myISAM or InnoDB Engine

    - by kamal
    I want to confirm if the statement below is indeed true: There is no way to specify a storage engine for a certain database, only for single tables, You can, however, specify a storage engine to be used during one session with: SET storage_engine=InnoDB; so you don't have to specify it for each table. How do i confirm, if indeed all the tables are using InnoDB All the tables were using myISAM.

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  • Good JavaScript engine for animating via Sprite Sheets (not in canvas)

    - by N. Taylor Mullen
    I've looked around a bit for a great JavaScript Sprite Sheet animator lib/engine but couldn't find any good ones so I thought I'd ask around =). What I'm looking for in the engine is: Animate an image in a non-canvas setting (ex: div via css or img tags) Control frame rate/animation speed Flags to loop or to animate once etc. Are there any engines like this out there? If not I can always make my own but then again, I don't want to re-invent the wheel =].

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  • Firefox - built in search engine toolbar broken

    - by Victor78
    When I change the order of the search engines (Toolbar - Manage Search Engines - Move up / down - Ok) it changes the order, until I close and reopen the browser. I can't imagine that's the way it's supposed to work. I want it to stay in the order I select. I have no add-ons installed that have anything to do with search engines, nor that add any toolbars. I am not using a customized theme. Apparently this problem is rare, as Googling [ "manage search engine list" ("order reverts" OR "order changes") ] return 0 results. Firefox 3.6.12; Windows XP Pro SP3.

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  • MATLAB: What is an appropriate Data Structure for a Matrix with Random Variable Entries?

    - by user12707
    I'm working in an area that is related to simulation and trying to design a data structure that can include random variables within matrices. I am currently coding in MATLAB. To motivate this let me say I have the following matrix: [a b; c d] I want to find a data structure that will allow for a, b, c, d to be either real numbers or random variables. As an example, let's say that a = 1, b = -1, c = 2 but let d be a normally distributed random variable with mean 20 and SD 40. The data structure that I have in mind will give no value to d. However, I also want to be able to design a function that can take in the structure, simulate an uniform(0,1), obtain a value for d using an inverse CDF and then spit out an actual matrix. I have several ideas to do this (all related to the MATLAB icdf function) but would like to know how more experienced programmers would do it. In this application, it's important that the structure is as "lean" as possible since I will be working with very very large matrices and memory will be an issue.

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  • How to integrate camera image into physics engine?

    - by Pedro
    I recently came across this and would like to implement something similar. The basic approach is clear: I have to threshold the image and check if a virtual object collides with the remaining foreground. Instead of implementing the physics myself, I'd like use an engine like Box2D. But how do I integrate the thresholded image into the physics engine so it is possible to interact with virtual objects?

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  • What WordPress Plugins Do I Need For Search Engine Optimization?

    By itself WordPress is a wonderful format, it is already search engine friendly and easy to use. But we all want more traffic which is why we need the help of search engines. With search engine optimization you make your website even more appealing and search engine friendly. This means search engines will like referring you and your blog.

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  • Subdomain is preventing my search results from rising as expected in page rank

    - by culov
    My problem is that I have a site which has requires a dedicated page for every city I choose to support. Early on, I decided to use subdomains rather than a directly after my domain (ie i used la.truxmap.com rather than truxmap.com/la). I realize now that this was a major mistake because Google seems to treat la.truxmap.com as a completely different site as ny.truxmap.com. So for instance, if i search "la food truck map" my site will be near the top, however, if i search "nyc food truck map" im no where in sight because ny.truxmap.com wouldnt be very high in the page rank by itself, and it doesnt have the boost that it ought to be getting from the better known la.truxmap.com So a mistake I made a year ago is now haunting my page rank. I'd like to know what the most painless way of resolving my dilemma might be. I have received so much press at la.truxmap.com that I can't just kill the site, but could I re-direct all requests at la.truxmap.com to truxmap.com/la and do the same for all cities supported without trashing my current, satisfactory page rank results I'm getting from la.truxmap.com ?? EDIT I left out some critical information. I am using Google Apps to manage my domain (that is, to add the subdomains) and Google App Engine to host my site. Thus, Google Apps provides a simple mechanism to mask truxmap.appspot.com (the app engine domain) as la.truxmap.com, but I don't see how I can mask it as truxmap.com/la. If I can get this done, then I can just 301 redirect la.truxmap.com to truxmap.com/la as suggested below. Thanks so much!

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  • Fatal Execution Engine Error on the Windows2008 r2, IIS7.5

    - by user66524
    Hi Guys We are running some asp.net(3.5) applications on the Windows2008 r2, IIS7.5. Recently we got some event logs so difficult, we have not idea hope some guys can help. 1.EventID: 1334 (9-1-2011 8:41:57) Error message An error occurred during a process host idle check. Exception: System.AccessViolationException Message: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. StackTrace: at System.Collections.Hashtable.GetEnumerator() at System.Web.Hosting.ApplicationManager.IsIdle() at System.Web.Hosting.ProcessHost.IsIdle() 2.EventID: 1023 (9-1-2011 19:44:02) Error message .NET Runtime version 2.0.50727.4952 - Fatal Execution Engine Error (742B851A) (80131506) 3.EventID: 1000 (9-1-2011 19:44:03) Error message Faulting application name: w3wp.exe, version: 7.5.7600.16385, time stamp: 0x4a5bcd2b Faulting module name: mscorwks.dll, version: 2.0.50727.4952, time stamp: 0x4bebd49a Exception code: 0xc0000005 Fault offset: 0x0000c262 Faulting process id: 0x%9 Faulting application start time: 0x%10 Faulting application path: %11 Faulting module path: %12 Report Id: %13 4.EventID: 5011 (9-1-2011 19:44:03) Error message A process serving application pool 'AppPoolName' suffered a fatal communication error with the Windows Process Activation Service. The process id was '2552'. The data field contains the error number. 5.some info: we got the memory.hdmp(234MB) and minidump.mdmp(19.2) from control panel action center but I donot know how to use that :(

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  • Hiding a Website from Search Engine Bots and Viewers by Disabling Default VirtualHost

    - by Basel Shishani
    When staging a website on a remote VPS, we would like it to be accessible to team members only, and we would also like to keep the search engine bots off until the site is finalized. Access control by host whether in Iptables or Apache is not desirable, as accessing hosts can vary. After some reading in Apache config and other SF postings, I settled on the following design that relies on restricting access to only through specific domain names: Default virtual host would be disabled in Apache config as follows - relying on Apache behavior to use first virtual host for site default: <VirtualHost *:80> # Anything matching this should be silently ignored. </VirtualHost> <VirtualHost *:80> ServerName secretsiteone.com DocumentRoot /var/www/secretsiteone.com </VirtualHost> <VirtualHost *:80> ServerName secretsitetwo.com ... </VirtualHost> Then each team member can add the domain names in their local /etc/hosts: xx.xx.xx.xx secrethostone.com My question is: is the above technique good enough to achieve the above said goals esp restricting SE bots, or is it possible that bots would work around that. Note: I understand that mod_rewrite rules con be used to achieve a similar effect as discussed here: How to disable default VirtualHost in apache2?, so the same question would apply to that technique too. Also please note: the content is not highly secretive - the idea is not to devise something that is hack proof, so we are not concerned about traffic interception or the like. The idea is to keep competitors and casual surfers from viewing the content before it's released, and to prevent SE bots from indexing it.

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  • Parallel Environment (PE) on Sun Grid Engine (6.2u5) won't run jobs: "only offers 0 slots"

    - by Peter Van Heusden
    I have Sun Grid Engine set up (version 6.2u5) on a Ubuntu 10.10 server with 8 cores. In order to be able to reserve multiple slots, I have a parallel environment (PE) set up like this: pe_name serial slots 999 user_lists NONE xuser_lists NONE start_proc_args /bin/true stop_proc_args /bin/true allocation_rule $pe_slots control_slaves FALSE job_is_first_task TRUE urgency_slots min accounting_summary FALSE This is associated with the all.q on the server in question (let's call the server A). However, when I submit a job that uses 4 threads with e.g. qsub -q all.q@A -pe serial 4 mycmd.sh, it never gets scheduled, and I get the following reasoning from qstat: cannot run in PE "serial" because it only offers 0 slots Why is SGE saying "serial" only offers 0 slots, since there are 8 slots available on the server I specified (server A)? The queue in question is configured thus (server names changed): qname all.q hostlist @allhosts seq_no 0 load_thresholds np_load_avg=1.75 suspend_thresholds NONE nsuspend 1 suspend_interval 00:05:00 priority 0 min_cpu_interval 00:05:00 processors UNDEFINED qtype BATCH INTERACTIVE ckpt_list NONE pe_list make orte serial rerun FALSE slots 1,[D=32],[C=8], \ [B=30],[A=8] tmpdir /tmp shell /bin/sh prolog NONE epilog NONE shell_start_mode posix_compliant starter_method NONE suspend_method NONE resume_method NONE terminate_method NONE notify 00:00:60 owner_list NONE user_lists NONE xuser_lists NONE subordinate_list NONE complex_values NONE projects NONE xprojects NONE calendar NONE initial_state default s_rt INFINITY h_rt 08:00:00 s_cpu INFINITY h_cpu INFINITY s_fsize INFINITY h_fsize INFINITY s_data INFINITY h_data INFINITY s_stack INFINITY h_stack INFINITY s_core INFINITY h_core INFINITY s_rss INFINITY h_rss INFINITY s_vmem INFINITY h_vmem INFINITY,[A=30g], \ [B=5g]

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  • Fatal Execution Engine Error on the Windows2008 r2, IIS7.5

    - by user66524
    Hi Guys We are running some asp.net(3.5) applications on the Windows2008 r2, IIS7.5. Recently we got some event logs so difficult, we have not idea hope some guys can help. 1.EventID: 1334 (9-1-2011 8:41:57) Error message An error occurred during a process host idle check. Exception: System.AccessViolationException Message: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. StackTrace: at System.Collections.Hashtable.GetEnumerator() at System.Web.Hosting.ApplicationManager.IsIdle() at System.Web.Hosting.ProcessHost.IsIdle() 2.EventID: 1023 (9-1-2011 19:44:02) Error message .NET Runtime version 2.0.50727.4952 - Fatal Execution Engine Error (742B851A) (80131506) 3.EventID: 1000 (9-1-2011 19:44:03) Error message Faulting application name: w3wp.exe, version: 7.5.7600.16385, time stamp: 0x4a5bcd2b Faulting module name: mscorwks.dll, version: 2.0.50727.4952, time stamp: 0x4bebd49a Exception code: 0xc0000005 Fault offset: 0x0000c262 Faulting process id: 0x%9 Faulting application start time: 0x%10 Faulting application path: %11 Faulting module path: %12 Report Id: %13 4.EventID: 5011 (9-1-2011 19:44:03) Error message A process serving application pool 'AppPoolName' suffered a fatal communication error with the Windows Process Activation Service. The process id was '2552'. The data field contains the error number. 5.some info: we got the memory.hdmp(234MB) and minidump.mdmp(19.2) from control panel action center but I donot know how to use that :(

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  • Sun Grid Engine (SGE) / limiting simultaneous array job sub-tasks

    - by wfaulk
    I am installing a Sun Grid Engine environment and I have a scheduler limit that I can't quite figure out how to implement. My users will create array jobs that have hundreds of sub-tasks. I would like to be able to limit those jobs to only running a set number of tasks at the same time, independent of other jobs. Like I might have one array job that I want to run 20 tasks at a time, and another I want to run 50 tasks at a time, and yet another that I'm fine running without limit. It seems like this ought to be doable, but I can't figure it out. There's a max_aj_instances configuration option, but that appears to apply globally to all array jobs. I can't see any way to use consumable resources, as I'd need a "complex attribute" that is per-job, and that feature doesn't seem to exist. It didn't look like resource quotas would work, but now I'm not so sure of that. It says "A resource quota set defines a maximum resource quota for a particular job request", but it's unclear if an array job's sub-tasks' resource requests will be aggregated for the purposes of the resource quota. I'm going to play with this, but hopefully someone already knows outright.

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  • How can I effectively test a scripting engine?

    - by ChaosPandion
    I have been working on an ECMAScript implementation and I am currently working on polishing up the project. As a part of this, I have been writing tests like the following: [TestMethod] public void ArrayReduceTest() { var engine = new Engine(); var request = new ExecScriptRequest(@" var a = [1, 2, 3, 4, 5]; a.reduce(function(p, c, i, o) { return p + c; }); "); var response = (ExecScriptResponse)engine.PostWithReply(request); Assert.AreEqual((double)response.Data, 15D); } The problem is that there are so many points of failure in this test and similar tests that it almost doesn't seem worth it. It almost seems like my effort would be better spent reducing coupling between modules. To write a true unit test I would have to assume something like this: [TestMethod] public void CommentTest() { const string toParse = "/*First Line\r\nSecond Line*/"; var analyzer = new LexicalAnalyzer(toParse); { Assert.IsInstanceOfType(analyzer.Next(), typeof(MultiLineComment)); Assert.AreEqual(analyzer.Current.Value, "First Line\r\nSecond Line"); } } Doing this would require me to write thousands of tests which once again does not seem worth it.

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  • Data Flow Object Graph and An Execution Engine for it

    - by M Dotnet
    I would like to build a custom workflow engine from scratch. The input to this workflow is a data flow diagram which is composed of a series of activities connected together through lines where each each represent the data flow. Each activity can export multiple outputs. Activities are complex math functions but the logic is hidden from the user. My workflow engine job is to execute the given data flow diagram. Each activity within the data flow diagram is a custom activity and each activity can output different outputs. How do you suggest to model the data flow diagram object? I need to be able to construct the data flow diagram problematically (no need for drag and drop) but I need to display the final result graphically (for display and debugging purposes). Are there any libraries out there that I could use? Should I keep the workflow presentable as an xml? I know that there are many projects out there trying to essentially doing similar thing by building such workflow engines but I need something light weight and open source. I do not need any state machine execution engine and mine is primarily sequential workflow with fork and join capabilities. My activities are wrappable as basic C# classes and I do NOT want to use anything as heavy as .NET workflow foundation.

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