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1. Laws of Reflection https://blog.golang.org/laws-of-reflection
2. Goalng Blog by William Kennady https://www.ardanlabs.com/blog/
3. Practicle go by Dave Chaney https://dave.cheney.net/practical-go/presentations/qcon-china.html
4. Effective go (official golang blog) https://golang.org/doc/effective_go.html

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package main

import (
	"fmt"
	"reflect"
)

func main() {
	type shivangi int32
	var a shivangi = 3

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package main

import (
	"sync"
	"fmt"
	"time"
	"https://github.com/uber-go/ratelimit"
)

var prev time.Time

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for running mapper reducer using python streaming

hadoop jar /usr/local/hadoop-streaming-2.7.2.jar   -input input   -output output3   -mapper mapper.py   -reducer reducer.py

copy file form one user to another:
sudo cp /home/USER1/FNAME /home/USER2/FNAME 

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/usr/local/hadoop-2.8.0/bin/hadoop jar ~/Downloads/
hadoop-streaming-2.8.0.jar -mapper mapper.py -reducer reducer.py  -file mapper_kmeans.py  -file reducer_kmeans.py -input input/cluster.txt -output output_l

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import os
directory = os.path.dirname("/Users/user-name/your-directory/")
# directory = (os.getcwd());
# print directory

for filename in os.listdir(directory):
    if filename.endswith(".txt"): 
        print(os.path.join(directory, filename))
        continue
    else:

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Open a command prompt.
Go to the directory where you have your .java files
Create a directory "build"
Run java compilation from the command line

javac -d ./build *.java  
#if there are multiple files to be jarred or


javac -d ./build file_name.java

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1) install python3 (numpy has one dependency which needs python3.4 so it is better to install python3)
2) install pip python3:
  sudo apt install python3-pip
3) install sklearn:
  pip3 install -U scikit-learn
4) test on python if it is successfully installed:
python3
from sklearn.cluster import KMeans
if everything is imported successfully then its cool, else it will ask to install python numpy
5) install python numpy

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to see the log of git commits :
git log branchname

to change a commit messsage:(not tested this)
git commit --amend

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if you wish to revert the changes of a single file use this command (when you file name does not match with any of the branch names):
git checkout filename

if your file name is similar to any of your branch names the use this command:
git checkout -- filename