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Friday, 21 June 2019

How To Update DND Settings For TRAI, Jio, Idea India


1. If you receive any unsolicited commercial communications seven days after registration of your telephone number in the NCPR, you may register a complaint by: 

  • Dialling the toll free number 1909; or 
  • Sending an SMS to 1909 
2. It is important to note that: 
The complaint has to be registered from the telephone number on which unsolicited commercial communication has been received. 

Your complaint must be made within three days of receipt of the unsolicited commercial communication. 


1. Dial 1909, listen to the instructions and choose one of the following to register your complaint: 

  • Through customer care executive 
  • Through IVRS(Interactive Voice Response System) 


1. Dial 1909 and select the option for registering the complaint through the customer care executive. 

2. Provide the details of the unsolicited commercial communication to the customer care executive including: 
a. Particulars of the telemarketer; 
b. The telephone number from which the unsolicited commercial communication originated; 
c. The date and time of the unsolicited commercial communication
d. A brief description of the unsolicited commercial communication.

3. The customer care executive will register the customer complaint and acknowledge the complaint by providing a unique complaint number. 

4. Preserve this unique complaint number for further communication. 

5. You will be informed of the action taken on your complaint within 7 days of the complaint booking. 


1. You may register a complaint regarding receipt of unsolicited commercial communications by sending SMS to 1909 in the specified format given below, with or without space after comma: 

“The Unsolicited Commercial Communication, XXXXXXXXXX, dd/mm/yy” 

Where XXXXXXXXXX – is the telephone number or header of the SMS, as the case may be, from which the unsolicited commercial communication has originated. 

2. The complaint will be registered and acknowledged by the access provider by sending a unique complaint number through SMS. 

3. You will be informed of the action taken on your complaint within 7 days of the complaint booking.

-> Jio and Idea Cellular have an option to update DND preferences in their mobile apps on Google Play Store and App Store. 

-> Airtel users can use their website to update the same.

-> Vodafone users can use this link to update the same.

Sunday, 14 April 2019

Download You Tube Videos & You Tube To MP3 Converter FREE

Hi friends,

YouTube recently launched its premium services, especially in India, where they have a super huge fan base of artists from all over the world, and not to forget that the people there pushed their channel T-series to YouTube's 2nd most subscribed channel (:P Sorry PewDiePie). But that's not what I am here to discuss today, I am here to tell you about two super cool ways you can increase your YouTube experience without putting a hole in your pocket (Unless you want this software's premium features ofcourse). Without further ado, let's address the elephant in the room.

If you are an audiophile like me, you must be scanning YouTube every now and then to listen to the latest buzz - EDM, Trap, Techno, Deep House, Bollywood (-_-), etc. One problem that I always used to face was if I can listen to these tracks like an mp3 file that can be played via my phone's audio app. There are many online ways to do the same, but specifically two of them outperform the others. And they are:

4k Video Downloader

I have never seen another app that achieves the same with so little input. This app is so versatile that all you need to do is enter the video's URL or playlist's URL and ~BAM~ your download starts.

It has options to control the download video quality and you can also download it as mp3. It firsts downloads the video and then locally creates an mp3 file out of it. 

Friday, 15 February 2019

A Clustering Guide to CrateDB and ElasticSearch

Hi friends,

Recently I ran CrateDB in multi-node environment as a trial and in this post I'll share my findings as to what is the basic setup and configuration that is required to have high availability setup in CrateDB. I am pretty sure that similar settings will be useful for ElasticSearch as well.

I used crateDB version 3.2.2 and Java 8 for this POC.

So there is some bootstrap checks before the server runs successfully. According to the documentation those are some mandatory checks that are mandatory and needed to get the cluster running smoothly in multi-node environment. 

The first problem I faced was related to increasing ulimit in Ubuntu, which I have explained in this post - Increase Open Files/File Descriptors/Ulimit in Ubuntu | CrateDB ElasticSearch.

Once my CrateDB ran successfully, I began to mess around with basic settings and configurations. Remember, many of the things can be customised, and I'll share a few read-worthy links if you truly want to customise all settings around your cluster, towards the end of this post.

So here's the final configuration that worked for me:

Here's the explanation for the non-obvious ones:

Increase Open Files/File Descriptors/Ulimit in Ubuntu | CrateDB ElasticSearch

Hi friends,

This week I faced a rather peculiar issue while trying to setup clustering in CrateDB, which is very much similar to the clustering done in ElasticSearch. As soon as I did the basic configuration which you can find here, starting the process showed the following kinds of exceptions:

ERROR: bootstrap checks failed
max file descriptors [16384] for elasticsearch process is too low, increase to at least [65536]
max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

java.lang.RuntimeException: bootstrap checks failed
initial heap size ... not equal to maximum heap size ...; this can cause resize pauses and prevents mlockall from locking the entire heap
please set [discovery.zen.minimum_master_nodes] to a majority of the number of master eligible nodes in your cluster
    at org.elasticsearch.bootstrap.BootstrapCheck.check(

[WARN ][o.e.b.BootstrapChecks    ] [node-1] max file descriptors [...] for elasticsearch process is too low, increase to at least [65536]
[WARN ][env ] max file descriptors [65535] for elasticsearch process likely too low, consider increasing to at least [65536]
[WARN ][o.e.b.BootstrapChecks    ] [node-1] max number of threads [1024] for user [] is too low, increase to at least [2048]
[WARN ][o.e.b.BootstrapChecks    ] [node-1] system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk   

The second one which is related to heap size can be very easily solved by specifying HEAP params in environment variables of your system for CrateDB or ElasticSearch. You need to have the same heap size for -Xmx and -Xms. Something like:


The other one, max file descriptors, is related to ulimit set on your system. To see your existing hard and soft limits, use these commands in terminal:

$ ulimit -Hn
$ ulimit -Sn

In my case, hard limit was set to 4096 and soft limit was set to 1024 by default.
Also, using this option doesn't work in Ubuntu, atleast not in 18.04:
$ ulimit -n 70000
In order to solve the remaining issue related to max open files or increase file descriptors, just follow these steps and you will be good to go:

  • Go to the following file:

$ sudo vim /etc/security/limits.conf

  • Add the following lines in the file:

* soft nofile 80000

* hard nofile 80000

* soft nproc 80000

* hard nproc 80000

root soft nofile 80000

root hard nofile 80000
  • Save the changes.
  • Next you need to go to the following file:
$ sudo vim /etc/systemd/user.conf
  • Add this to the file and save changes:
  • Do the same in the following file:
$ sudo vim /etc/systemd/system.conf
These changes take care that the ulimit is increased for GUI based login.

Thursday, 14 February 2019

Switch Between Multiple Java Versions on Linux

Hi friends,

In my previous blog post - Install Java 11 and Java 8 on Linux, I shared the way to install Java 11/Java 8 on your Linux machine. Now many of the current applications do not support Java 11 yet, so you must need a way to quickly switch between different installations of Java on your Linux machine. Without further ado, let's get started.

Way 1:

If you actually followed my way of installing Java 8/ Java 11 on your machine, and did set Java 8 / Java 11 default by using either of these commands:

sudo apt install oracle-java8-set-default

sudo apt install oracle-java11-set-default

Simply install the other command and it will automatically set that version as default in your system.

Now if you have both the above packages installed and now you want to set either of them as default, simply purge the one you wish to set as default and reinstall it.

So if you want to set Java 8 as default, run these commands in your terminal in order:

sudo apt purge oracle-java8-set-default

sudo apt install oracle-java8-set-default

If you want to set Java 11 as default, run these commands in your terminal in order:

sudo apt purge oracle-java11-set-default

sudo apt install oracle-java11-set-default

Way 2: