I am a newbie to Hadoop programming and in order to play around with it, I set up Hortonworks, and what better way than trying out the examples given in the Hortonworks website? Easy as it seems…

But,

To be honest, the (few) tutorials on the examples are a huge pain in the ***. Somehow trying high and low, I was able to get data into HCatalog (Don’t ask me how! I may write another article on it sometime soon though, before I forget!). But getting the data to visualize in Excel, as the tutorial stated seemed to be a problematic task.

So here it is guys, how I fixed problems with getting the Hortonworks ODBC driver to work on Windows. This is based on top of this tutorial titled “How To Refine and Visualize Sentiment Data”.

My specs are :

• Hortonworks 2.1 
• Windows 8 64 bit

Steps:
ERROR [HY000] [Microsoft][HiveODBC] (35) Error from Hive: error code: '40000' error message: 'Error while compiling statement: FAILED: HiveAccessControlException Permission denied. Principal [name=hue, type=USER] does not have following privileges on Object [type=TABLE_OR_VIEW, name=default.tweetsbi] : [SELECT]'. (Microsoft Hive ODBC Driver)

hive

grant SELECT on table tweetsbi to user hue;

Okay, so I came across a situation where I needed to migrate my wordpress site from local to server (in my case which was running on Ubuntu). Everything was working fine until I came across many issues after setting up the site on the server. I had made some changes to the permalinks and now , suddenly, everything just turned into a mess.

Hence I decided to pen down this article in the hope that it may help some of you because I had searched up and down and suffered a lot trying to understand why it was causing issues.

This is the message I got:




Before we proceed on fixing the issues, lets try to put the pieces together now, shall we?

What Really Happened before the 404

2. You save the changes.

3. Depending on certain scenarios, you may or may not get this message at the very bottom of your screen.





4. In this case, you would manually have to change the contents. And hence you have to copy the contents listed there and paste it into the .htaccess file.




5. Now the reason you may wonder you don’t see the .htaccess file (along with some others) is because it’s a hidden file.

You may have to make the hidden files visible. (Ctrl+H or google it up to find the way). If its still not visible, you could just create a .htaccess file and paste the contents in. Like given below:




From the above code, <IfModule checks within apache whether the mod_rewrite.c module is included within itself. If it is, the code block runs. Else it does not. (which is the problem I and most of you out there is facing).

Somehow the damage is done. How do I fix the permalink issues?

If you had tried changing permalinks, your .htaccess file will get updated using new rewrite rules. This is generally what should happen, but the reason the 404 error comes is simply because none of the rewrite rules of your .htaccess file gets executed.

Why doesn't the rewrite rules get executed?

Note: throughout the tutorial i am assuming that you have permissions to carry out commands and also you have permissions to edit files. You may come across situations where you would have to do it, so if you get an error stating you do not have permission for carrying out a task, make sure you get access rights.

Enabling mod_rewrite.c module on Apache

1. To do that, simply open up terminal and type in this command :

sudo a2enmod rewrite

This will simply enable the rewrite module in apache.

2. If this was successful, then you could simply restart apache using the below command.

service apache2 restart

or

sudo /etc/init.d/apache2 restart

3. Now refresh your browser and check if your 404 error has vanished. If it has, congratulations.

It still does not work. What do I do now?

Scenario 1: 

If you are still stuck maybe there is one thing you would have forgotten.You should do the following:

1. Give .htaccess files permission to override previous directives

You would generally have to open up httpd.conf file. (I have tried high and low trying to figure out where this file was, but if you don’t find this file, apache2.conf is the file you need to be looking at (in my case)).

If you don't find this file, don't worry According to their documentation, find one of these: 

On Ed/X/Ubuntu 6.06 and Ubuntu Edgy Eft, the "main server configuration file" is /etc/apache2/apache2.conf . 

in the LAMP download about a week ago with Ubuntu 9.10 (Karmic) the default configuration file was /etc/apache2/sites-available/000-default

So feel free to trotter around these folders within apache2 to find the file.

On my server, this is where it resides.




2. Open up the file and locate a section that looks like (fully, partially or almost close) to this:

<Directory /var/www/>
Options Indexes FollowSymLinks MultiViews
AllowOverride None
Order allow,deny
allow from all
# Uncomment this directive is you want to see apache2's
# default start page (in /apache2-default) when you go to /
#RedirectMatch ^/$ /apache2-default/
</Directory>

3. Replace the “AllowOverride None” with “AllowOverride All. This tells Apache that it's okay to allow.htaccess files to over-ride previous directives.

After the change the piece of code looks like this:



4. You might need to reload or restart (step given above) Apache before this change will have an effect:

sudo /etc/init.d/apache2 reload

Now your .htaccess files in your wordpress root directory will be able to make a difference. Your permalink issues should be sorted by now.

Scenario 2: 

If you got an error message as such after you tried to enable the rewrite module, like this…



... it is probably because your userdir is not enabled in apache. In the apache documentation it says that by default, access to these directories is not enabled.

Lets enable it now.

1. Type into the console the following as you can see in the image:




2. Open your mods-enabled folder under the apache2 folder. You can now see the rewrite.load file has appeared in it.

3. Refresh your browser and now you can see the site running fine.

Scenario 3: 

Maybe your rewrite rules are not included within your .htaccess file or something along that line. Idk. Read the first heading given above to check around a bit.

If none of them also work, I am sorry I don’t think I can find any other way. You may just have to search for more ways.

Eventually you shall come up with a solution like I did.

Many a time, when trying to enable USB Debugging, our devices may not actually get discovered whatever you try to do.

So here is how I was able to fix the issues I faced with USB Debugging.

How to enable USB Debugging option on your device

This is how you do it. 

    1. Go to Settings -> About Device 

 

2. Now, click on the "Build Number" seven times and you get a message saying "Developer options has been enabled

3. And now, your "Developer Options" has appeared back again

On Windows

Now for your device to get detected in order to run the app on it, you will need appropriate drivers. Sometimes, as you plug your device to the machine, the drivers automatically update themselves. But in other cases, you might have to manually do that and you may not always have the drivers. 

This is the driver I used for Galaxy Grand DUOS. This will also work for other phones. (But first make sure your device is connected to the machine through a USB cable)

https://www.dropbox.com/s/c5nv47vx8sxcz42/Samsung_USB_Driver_for_Mobile_Phones_v1.5.14.0.exe

If the above doesn't work, you can alternatively try this too. 

http://developer.samsung.com/android/tools-sdks/Samsung-Andorid-USB-Driver-for-Windows

On Mac

On MAC machines, you don't need a driver. Follow the link below and download this application. Run it once after connecting your device to your machine through a usb cable. 

http://www.android.com/filetransfer/

Sometimes deploying your app on your iPad/iPhone can be such a mess. Apple somehow makes things so complicated for a novice user to understand and use it. There are so many articles out there related to code signing, but sometimes its not very easy for users to understand what is happening where.

Why is the Certificate a big deal?

To run the app on our development devices, we first need to create a development certificate and then once that is done we need to code sign our app. You can either do it through Xcode in your organizer tab or from the Member Center in the developer.apple.com. I will go with the latter. 

The App Id is also set. To run this app, we need devices. We should register devices that we are going to deploy our application to. We will look at how to do this.

1. Go to Certificates, Identifiers and Profiles > Devices >All

2. Click on the “+” button to add a device.

3. Specify a name to your device

4. You also need to find the UDID(Unique Device Identifier) of your device. This is the 40 character hex string that uniquely identifies your device. The easiest way to find this is to …

a. Go to Itunes > devices  
Now you also have your devices set-up. The final task is to set up your provisioning profile.