error using miniDFSCluster on windows - hdfs

I'm trying to write unit tests using miniDFSCluster and it's throwing the error below
java.lang.UnsatisfiedLinkError: org.apache.hadoop.io.nativeio.NativeIO$Windows.access0(Ljava/lang/String;I)Z
any pointers to resolve this issue?

With errors like this, I use three steps
Find out what it is looking for
In this case, *org.apache.hadoop.io.nativeio.NativeIO$Windows.access0*
Find out what jar/lib it is in.
I don't use the Windows version, but I believe it is in hadoop.dll -
you'll have to check this.
Find out where I'm telling it to use that jar/lib
Update: See also this Answer.

I was able to resolve this error by following these steps:
Download hadoop.dll and winutils.exe in the same version that I'm using in the sbt/maven configuration, you can find these files in all versions of hadoop here: link
Put these 2 files in your %hadoop directory%\bin folder
make sure that %hadoop directory%\bin is listed under PATH in your device's environmental path(if using windows)
then the code should work just fine.

Related

Error: Program type already present: com.appsflyer.AFExecutor

I'm struggling to implement AppsFlyer on Android using Java.
I have looked into a couple of posts already such as this, this.
Here is the entire error message: [org.gradle.api.Project] AGPBI: {"kind":"error","text":"Program type already present: com.appsflyer.AFExecutor","sources":[{}],"tool":"D8"}
The version
AppsFlyer SDK: 5.+
Android Studio: 3.5.2
Situation
I have done till 4.1 of this guide so far so good.
On AndroidManifest.xml, the main class name of AF has implemented with android.name attribute.
On AndroidManifest.xml, receiver tag commented out (because in this phase I don't believe I do not need a precise data tracking feature.)
What I have tried.
./gradlew app:dependencies | less To find out AFExecutor in other dependencies
To exclude the program
implementation ('com.appsflyer:af-android-sdk:5.+'){
exclude module: 'com.appsflyer'
}
implementation ('com.appsflyer:af-android-sdk:5.+'){
exclude module: 'AFExecutor'
}
If you have any insights, I'd love to hear that.
Try ./gradlew clean, clean project and invalidate caches and restart. If does not help than delete all build and .idea folders, .iml files.
After exploring a bunch of dependencies, I found the solution. The reason was there was a conflict between com.appsflyer:af-android-sdk:5.+ and AF-Android-SDK.jar which had installed manually. After removing the JAR file and built again, I could make it at last! Thank you so much for sharing your experiences, however, the solution was simple!

Opencv ml header file not working

https://github.com/vikram-ma/OCR
when I try to run main.cpp from this code i got the following error
In file included from /home/akash/Desktop/OCR-master/main.cpp:9:0:
/home/akash/Desktop/OCR-master/OCR.h:43:3: error: ‘CvKNearest’ does not name a type
CvKNearest *knn;
^
CMakeFiles/OCR.dir/build.make:62: recipe for target 'CMakeFiles/OCR.dir/main.o' failed
please help
At first glance it seems you don't have OpenCV installed/downloaded.
The code you are poining to uses OpenCV library and it assumes you already have it.
You should go to OpenCV releases and download the version you need.
Edit:
I looked into it more closely and as suspected the code was using an old OpencCV version. Right now you are using 3.2.0 so you need to make some updates to the code itself.
Either you should go with an older version of the library (which I'm not suggesting but will be probably less effort) like 2.3-2.4 or update the code to the version you've already installed.
If you wish to do the latter, you can start by looking here: Transition guide
Among others, it is shown there that what used to be CvKNearest is now moved to cv::ml::KNearest. Updating accordingly should fix your first error.

Automatically generated WAF solution fails to load

Cryengine as an SDK has recently switched from providing pre-made solutions to forcing developers to use a WAF based build system to automatically generate a visual studio solution. Right now, there's very little communication coming from Crytek about problems everyone is having with the new build system so I was hoping someone here might be able to help.
I'm getting Cry-WAF (Crytek's WAF based build system) to generate a solution, but when I open it it provides an error (quoted below) and in the solution explorer appends (load failed) to each project in the solution. I first had an issue generating the solutions with Cry-WAF's msvs.py script saying it couldn't gather properties for platforms/configurations, but that eventually stopped and allowed the solution to be generated with the quoted problem.
A generic google search on the root cause suggested I try enabling IIS, but that has done nothing to fix the problems. Editing the .vcxproj files shows that they're correctly listing the paths to all files associated with that project. The only thing missing in the solution seems to just be the information that would tell what compiler to use, target names, target paths, etc. With what little I know about WAF as a build system, I'd assume that the python code Crytek is using to gather that information is just utterly failing.
Does anyone have a suggestion on what could possibly be done?
c:\Program Files (x86)\Steam\SteamApps\common\CRYENGINE\CRYENGINE_pc_eaascode\Solutions.depproj\CryAction.vcxproj : error : The composition produced a single composition error. The root cause is provided below. Review the CompositionException.Errors property for more detailed information.
1) Specified argument was out of the range of valid values.
Parameter name: index
Resulting in: An exception occurred while trying to get the value of property 'Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationMef.VCConfigurationShim'.
Resulting in: Cannot get export 'Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationMef.VCConfigurationShim (ContractName="Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationShim")' from part 'Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationMef'.
Element: Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationMef.VCConfigurationShim (ContractName="Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationShim") --> Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationMef
Resulting in: Cannot set import 'Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCLegacyEventsTranslator.VCConfiguration (ContractName="Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationShim")' on part 'Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCLegacyEventsTranslator'.
Element: Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCLegacyEventsTranslator.VCConfiguration (ContractName="Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationShim") --> Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCLegacyEventsTranslator
Resulting in: Cannot get export 'Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCLegacyEventsTranslator (ContractName="Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCLegacyEventsTranslator")' from part 'Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCLegacyEventsTranslator'.
Element: Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCLegacyEventsTranslator (ContractName="Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCLegacyEventsTranslator") --> Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCLegacyEventsTranslator
Resulting in: Cannot set import 'Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationMef.EventsTranslator (ContractName="Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCLegacyEventsTranslator")' on part 'Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationMef'.
Element: Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationMef.EventsTranslator (ContractName="Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCLegacyEventsTranslator") --> Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationMef
Resulting in: Cannot get export 'Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationMef.VCConfigurationShim (ContractName="Microsoft.VisualStudio.ProjectSystem.ConfiguredProject.HostObject")' from part 'Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationMef'.
Element: Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationMef.VCConfigurationShim (ContractName="Microsoft.VisualStudio.ProjectSystem.ConfiguredProject.HostObject") --> Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationMef
At the moment only Visual Studio 2012 is supported, so issues with Visual Studio 2013 are to be expected.
There is a thread on their forums dedicated to helping with WAF problems, which includes getting it up and running with Visual Studio 2013: http://www.cryengine.com/community/viewtopic.php?f=314&t=130850
The WAF documentation is here: http://docs.cryengine.com/display/SDKDOC4/Getting+Started+with+WAF
You will find help much more quickly on the CRYENGINE forums - few users habitually check Stack Overflow for these types of questions.

vs10 C++ $(MyLibrary) vs %(MyLibrary)

We are using an environment variable to specify a path to a library we use. Most of the time it points to the released version but sometimes to a development version.
Anyway, it works ok when I use $(MyLib)/path;%(AdditionalIncludeDirectories) for building the C++ application but I can not open the project resources. However, when I use %(MyLib)/path;%(AdditionalIncludeDirectories) it works.
Now, what is the difference?
I thought the correct way is to use $(EnvVar) but for the resource editor it doesn't seems to work. And if $(EnvVar) is the correct way then why does Visual Studio use %(AdditionalIncludeDirectories) and not $(AdditionalIncludeDirectories)
The error I get is: fatal error RC1015: cannot open include file 'afxres.h'.
You use %(item) to refer to an MSBuild metadata item. Using $(AdditionalIncludeDirectories) would not work well if you also had an environment variable by that name. So %(MyLib)/path ought to resolve to just /path.
You can put echo %(MyLib)/path in a prebuild event to verify this.
Which is probably enough to stop confusing rc.exe, the resource compiler. Which is a stone-cold-old SDK utility, going back all the way to Windows version 1.0. It is pretty temperamental, very picky about command line options and .rc script file text encoding. Do keep in mind that it dates from an era long before Windows started to support a forward slash as a path separator, everybody had to use a backslash back in 1986.
So use "$(MyLib)\path" instead, including the double quotes so you don't confuzzle it when MyLib contains embedded spaces. And do favor using a project property sheet instead so there are some odds that somebody can still figure out how to get the project built correctly 2+ years from now.

Py_Initialize fails - unable to load the file system codec

I am attempting to put together a simple c++ test project that uses an embedded python 3.2 interpreter. The project builds fine but Py_Initialize raises a fatal error:
Fatal Python error: Py_Initialize: unable to load the file system codec
LookupError: no codec search functions registered: can't find encoding
Minimal code:
#include <Python.h>
int main (int, char**)
{
Py_Initialize ();
Py_Finalize ();
return 0;
}
The OS is 32bit Vista.
The python version used is a python 3.2 debug build, built from sources using VC++ 10.
The python_d.exe file from the same build runs without any problems.
Could someone explain the problem and how to fix it? My own google-fu fails me.
EDIT 1
After going through the python source code I've found that, as the error says, no codec search functions have been registered. Both codec_register and PyCodec_Register are as they should be. It's just that nowhere in the code are any of these functions called.
I don't really know what this means as I still have no idea when and from where these functions should have been called. The code that raises the error is entirely missing from the source of my other python build (3.1.3).
EDIT 2
Answered my own question below.
Check the PYTHONPATH and PYTHONHOME environment variables and make sure they don't point to Python 2.x.
http://bugs.python.org/issue11288
Parts of this have been mentioned before, but in a nutshell this is what worked for my environment where I have multiple Python installs and my global OS environment set-up to point to a different install than the one I attempt to work with when encountering the problem.
Make sure your (local or global) environment is fully set-up to point to the install you aim to work with, e.g. you have two (or more) installs of, let's say a python27 and python33 (sorry these are windows paths but the following should be valid for equivalent UNIX-style paths just as well, please let me know about anything I'm missing here (probably the DLLs path might differ)):
C:\python27_x86
C:\python33_x64
Now, if you intend to work with your python33 install but your global environment is pointing to python27, make sure you update your environment as such (while PATH and PYTHONHOME may be optional (e.g. if you temporarily work in a local shell)):
PATH="C:\python33_x64;%PATH%"
PYTHONPATH="C:\python33_x64\DLLs;C:\python33_x64\Lib;C:\python33_x64\Lib\site-packages"
PYTHONHOME=C:\python33_x64
Note, that you might need/want to append any other library paths to your PYTHONPATH if required by your development environment, but having your DLLs, Lib and site-packages properly set-up is of prime importance.
Hope this helps.
The core reason is quite simple: Python does not find its modules directory, so it can of course not load encodings, too
Python doc on embedding says "Py_Initialize() calculates the module search path based upon its best guess" ... "In particular, it looks for a directory named lib/pythonX.Y"
Yet, if the modules are installed in (just) lib - relative to the python binary - above guess is wrong.
Although docs says that PYTHONHOME and PYTHONPATH are regarded, we observed that this was not the case; their actual presence or content was completely irrelevant.
The only thing that had an effect was a call to Py_SetPath() with e.g. [path-to]\lib as argument before Py_Initialize().
Sure this is only an option for an embedding scenario where one has direct access and control over the code; with a ready-made solution, special steps may be necessary to solve the issue.
Ran into the same thing trying to install brew's python3 under Mac OS! The issue here is that in Mac OS, homebrew puts the "real" python a whole layer deeper than you think. You would think from the homebrew output that
$ echo $PYTHONHOME
/usr/local/Cellar/python3/3.6.2/
$ echo $PYTHONPATH
/usr/local/Cellar/python3/3.6.2/bin
would be correct, but invoking $PYTHONPATH/python3 immediately crashes with the abort 6 "can't find encodings." This is because although that $PYTHONHOME looks like a complete installation, having a bin, lib etc, it is NOT the actual Python, which is in a Mac OS "Framework". Do this:
PYTHONHOME=/usr/local/Cellar/python3/3.x.y/Frameworks/Python.framework/Versions/3.x
PYTHONPATH=$PYTHONHOME/bin
(substituting version numbers as appropriate) and it will work fine.
From python3k, the startup need the encodings module, which can be found in PYTHONHOME\Lib directory.
In fact, the API Py_Initialize () do the init and import the encodings module.
Make sure PYTHONHOME\Lib is in sys.path and check the encodings module is there.
I had this issue with python 3.5, anaconda 3, windows 7 32 bit. I solved it by moving my pythonX.lib and pythonX.dll files into my working directory and calling
Py_SetPythonHome(L"C:\\Path\\To\\My\\Python\\Installation");
before initialize so that it could find the headers that it needed, where my path was to "...\Anaconda3\". The extra step of calling Py_SetPythonHome was required for me or else I'd end up getting other strange errors where python import files.
I just ran into the exact same problem (same Python version, OS, code, etc).
You just have to copy Python's Lib/ directory in your program's working directory ( on VC it's the directory where the .vcproj is )
There appears to be something going wrong with the release build either failing to include the appropriate codecs or else misidentifying the codec to use for system APIs. Since the python_d executable is working, what does that return for os.getfsencoding()? (Use the C API to call that between your Initialize/Finalize calls)
I had the same issue and found this question. However from the answers here I was not able to solve my problem. I started debugging the cpython code and thought that I might be discovered a bug. Therefore I opened a issue on the python issue tracker.
My mistake was that I did not understand that Py_SetPath clears all inferred paths.
So one needs to set all paths when calling this function.
Link to the issue conversation
For completion I also copied the most important part of the conversation below.
My original issue text
I compiled the source of CPython 3.7.3 myself on Windows with Visual Studio 2017 together with some packages like e.g numpy. When I start the Python Interpreter I am able to import and use numpy. However when I am running the same script via the C-API I get an ModuleNotFoundError.
So the first thing I did, was to check if numpy is in my site-packages directory and indeed there is a folder named numpy-1.16.2-py3.7-win-amd64.egg. (Makes sense because the python interpreter can find numpy)
The next thing I did was to get some information about the sys.path variable created when running the script via the C-API.
#### sys.path content ####
C:\Work\build\product\python37.zip
C:\Work\build\product\DLLs
C:\Work\build\product\lib
C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2017\PROFESSIONAL\COMMON7\IDE\EXTENSIONS\TESTPLATFORM
C:\Users\rvq\AppData\Roaming\Python\Python37\site-packages
Examining the content of sys.path I noticed two things.
C:\Work\build\product\python37.zip has the correct path 'C:\Work\build\product\'. There was just no zip file. All my files and directory were unpacked. So I zipped the files to an archive named python37.zip and this resolved the import error.
C:\Users\rvq\AppData\Roaming\Python\Python37\site-packages is wrong it should be C:\Work\build\product\Lib\site-packages but I dont know how this wrong path is created.
The next thing I tried was to use Py_SetPath(L"C:/Work/build/product/Lib/site-packages") before calling Py_Initialize(). This led to
Fatal Python Error 'unable to load the file system encoding'
ModuleNotFoundError: No module named 'encodings'
I created a minimal c++ project with exact these two calls and started to debug Cpython.
int main()
{
Py_SetPath(L"C:/Work/build/product/Lib/site-packages");
Py_Initialize();
}
I tracked the call of Py_Initialize() down to the call of
static int
zipimport_zipimporter___init___impl(ZipImporter *self, PyObject *path)
inside of zipimport.c
The comment above this function states the following:
Create a new zipimporter instance. 'archivepath' must be a path-like
object to a zipfile, or to a specific path inside a zipfile. For
example, it can be '/tmp/myimport.zip', or
'/tmp/myimport.zip/mydirectory', if mydirectory is a valid directory
inside the archive. 'ZipImportError' is raised if 'archivepath'
doesn't point to a valid Zip archive. The 'archive' attribute of the
zipimporter object contains the name of the zipfile targeted.
So for me it seems that the C-API expects the path set with Py_SetPath to be a path to a zipfile. Is this expected behaviour or is it a bug?
If it is not a bug is there a way to changes this so that it can also detect directories?
PS: The ModuleNotFoundError did not occur for me when using Python 3.5.2+, which was the version I used in my project before. I also checked if I had set any PYTHONHOME or PYTHONPATH environment variables but I did not see one of them on my system.
Answer
This is probably a documentation failure more than anything else. We're in the middle of redesigning initialization though, so it's good timing to contribute this feedback.
The short answer is that you need to make sure Python can find the Lib/encodings directory, typically by putting the standard library in sys.path. Py_SetPath clears all inferred paths, so you need to specify all the places Python should look. (The rules for where Python looks automatically are complicated and vary by platform, which is something I'm keen to fix.)
Paths that don't exist are okay, and that's the zip file. You can choose to put the stdlib into a zip, and it will be found automatically if you name it the default path, but you can also leave it unzipped and reference the directory.
A full walk through on embedding is more than I'm prepared to type on my phone. Hopefully that's enough to get you going for now.
I had the problem and was tinkering with different solutions mentioned here. Since I was running my project from Visual Studio, apparently, I needed to set the environment path inside Visual Studio and not the system path.
Adding a simple PYTHONHOME=PATH\TO\PYTHON\DIR in the project solution\properties\environment solved the problem.
For me this happened when I updated Python 64 bit from 3.6.4 to 3.6.5. It threw some error like "unable to extract python.dll. Do you have permissions."
Pycharm also failed to load interpreter, even though I reloaded it in settings. Running python command gave same error, with and without administrator mode.
Reason
There was error in installation of Python, include folder in python installation directory C:\Users\USERNAME\AppData\Local\Programs\Python\Python36 was missing
Reinstalling Python also dint solve the issue.(Not removal and install)
Solution
Uninstall Python and Install of Python again.
Because running installer was just extracting same files excluding include folder
In my cases, for windows, if you have multiple python versions installed, if PYTHONPATH is pointing to one version the other ones didn't work. I found that if you just remove PYTHONPATH, they all work fine
For those working in Visual Studio simply add the include, Lib and libs directories to the Include Directories and Library Directories under
Projects Properties -> Configuration Properties > VC++ Directories :
For example I have Anaconda3 on my system and working with Visual Studio 2015 This is how the settings looks like (note the Include and Library directories) :
Edit:
As also pointed out by bossi setting PYTHONPATH in your user Environment Variables section seems necessary.
a sample input can be like this (in my case):
C:\Users\Master\Anaconda3\Lib;C:\Users\Master\Anaconda3\libs;C:\Users\Master\Anaconda3\Lib\site-packages;C:\Users\Master\Anaconda3\DLLs
is necessary it seems.
Also, you need to restart Visual Studio after you set up the PYTHONPATH in your user Environment Variables for the changes to take effect.
Also note that :
Make sure the PYTHONHOME environment variable is set to the Python
interpreter you want to use. The C++ projects in Visual Studio rely on
this variable to locate files such as python.h, which are used when
creating a Python extension.
So, for some reason the python dll fails to locate the encodings module. The python.exe executable apparently finds it because it has the expected relative path. Modifying the search path works.
The reason for all of this? Don't know but at least it works. I highly suspect a typo on my part somewhere, that's usually the reason for odd bugs it seems.