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implementation.py
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implementation.py
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#import pydoop.hdfs as hdfs
from collections import OrderedDict
from subprocess import *
import sys
import threading
from threading import Thread
import csv
import os
from time import *
from random import *
#import threading
#from threading import Thread
#result output
#run_cmd execvp
#args_list args
#
global cont
cont=1
def space(x):
for i in range(0,x):
print()
def change(t):
global cont
if t==1:
cont=1
else:
cont=0
def entry():
print("select option")
print("1. Load a new database")
print("2. Query ")
space(2)
def ask():
print("Enter Y if u want to continue")
print("Else enter N")
x=input()
x.lower()
if(x=='y'):
change(1)
space(4)
else:
change(0)
def ggg():
pass
def intro():
for i in range(0,10):
print("*",end="")
print("SQL Engine",end="")
for i in range(0,10):
print("*",end="")
space(3)
def execvp(args):
pid=Popen(args,stdout=PIPE,stderr=PIPE)
(result,err)=pid.communicate()
if not err:
return (err)
def y():
os.system('python3 /home/hadoop/selectmapper.py | python3 /home/hadoop/selectreducer.py')
intro()
l=list(range(1000,49,-1))
while(cont):
entry()
choice=int(input())
if choice==1:
#th1=Thread(target=gg)
#th1.start()
print("Enter load command")
command=input().split()
start=time()
com=command[1].split('/')
schema=command[3] #schema
dbname=com[0]
csvname=com[1]
createdb=['hdfs','dfs','-mkdir']
dbstring='/'+str(dbname)
createdb.append(dbstring)
execvp(createdb)
print("dir created")
args=['hdfs','dfs','-put','/home/hadoop/bigdata/']
args.append(csvname)
s='/'+dbname+'/'
args.append(s)
execvp(args)
print("Done")
schema=schema[1:-1]
#schemalist=[]
#schemalist.append(schema)
print(schema)
fp=open(str(csvname)+'.txt','w')
fp.write(schema)
fp.write("\n")
#print("CSVNAME",csvname)
with open(csvname,'r') as f:
data=csv.reader(f)
for r in data:
x=str(r)
x=x[1:-1]
fp.write(x)
fp.write("\n")
fp.close()
args_schema = ['hdfs','dfs','-copyFromLocal']
args_schema.append('/home/hadoop/'+ str(csvname)+'.txt')
args_schema.append('/'+str(dbname))
execvp(args_schema)
print("Schema Created")
args1=['hdfs','dfs','-put','/home/hadoop/bigdata/']
args1.append(str(csvname)+'.txt')
s1='/'+dbname+'/'
args1.append(s1)
execvp(args1)
#print("final hadoop")
end=time()
tofex=end-start
print("Successfully executed in: %s seconds " % (tofex) )
elif choice==2:
print("Enter the database name")
dbname=input() #bigdata
#print("Enter table name")
#csvname=input()
print("Enter query")
query=input().split()
start=time()
csvtablename=[str(dbname)+'.csv.txt']
with open("/home/hadoop/selectmapper.py") as f:
lines=f.readlines()
#print(lines)
lines[1]='query_list = '+ str(query) + '\n'
lines[2]='dbtextname= '+str(csvtablename)+'\n'
#dbtxtname=str(csvname)+'.txt'
#lines[2]='dbtextname=' +' +'\n'
with open("/home/hadoop/selectmapper.py",'w') as f:
f.writelines(lines)
#args2=['python3','/home/hadoop/selectmapper.py']
#execvp(args2)
#os.system('python3 /home/hadoop/selectmapper.py | python3 /home/hadoop/selectreducer.py')
inp='/bigdata/'+str(csvtablename[0])
#print("inp::::::::::::::",inp)
'''cmd = ['hadoop', 'jar', '/home/hadoop/hadoop/share/hadoop/tools/lib/hadoop-streaming-3.2.0.jar'
, '-file' ,'/home/hadoop/selectmapper.py' ,'-mapper' ,'\"python3 selectmapper.py\"',
'-file','/home/hadoop/selectreducer.py','-reducer' ,'\"python3 selectreducer.py\"', '-output',
'/bigdata/2', '-input']'''
r=l[-1]
l.pop()
print("Generated file: ",r)
cmd = ['hadoop', 'jar', '/home/hadoop/hadoop/share/hadoop/tools/lib/hadoop-streaming-3.2.0.jar'
, '-file' ,'/home/hadoop/selectmapper.py' ,'-mapper' ,'\"python3 selectmapper.py\"',
'-file','/home/hadoop/selectreducer.py','-reducer' ,'\"python3 selectreducer.py\"', '-output',
'/bigdata/'+str(r), '-input']
cmd.append(inp)
#print(cmd)
# execvp(cmd
print(' '.join(cmd))
os.system(' '.join(cmd))
end=time()
#os.system('python3 /home/hadoop/selectmapper.py | python3 /home/hadoop/selectreducer.py')
y()
#print("Successfully executed query")
tofex=end-start
print("Successfully executed in: %s seconds " % (tofex) )
else:
print("Wrong Option")
ask()