Class: RemoteHadoopGem

Inherits:
Object
  • Object
show all
Defined in:
lib/remoteHadoopGem.rb

Class Method Summary collapse

Class Method Details

.cleanTempFiles(username, host, keyPathFile) ⇒ Object 



107
108
109
 
# File 'lib/remoteHadoopGem.rb', line 107

def self.cleanTempFiles(username, host, keyPathFile)
  `ssh -i "#{keyPathFile}" -o StrictHostKeyChecking=no "#{username}"@"#{host}" "export PATH=/hadoop/bin/:$PATH; cd /hadoop/; rm ./tempJobID_* "`
end

.commandToHadoop(username, host, keyPathFile, command) ⇒ Object

****** commandToHadoop ******

function to run a command in a remote hadoop machine require: 1) username (to access the machine via ssh) 2) host (IP of the hadoop machine) 3) keyPathFile (path of the private key to access the machine) 4) command to execute



15
16
17
18
 
# File 'lib/remoteHadoopGem.rb', line 15

def self.commandToHadoop(username, host, keyPathFile, command)
  res=`ssh -i "#{keyPathFile}" -o StrictHostKeyChecking=no "#{username}"@"#{host}" "export PATH=/hadoop/bin/:$PATH; cd /hadoop/; #{command}"`
  return "#{res}"
end

.commandToHadoopJobID(username, host, keyPathFile, command) ⇒ Object 



32
33
34
35
36
37
38
39
40
41
42
 
# File 'lib/remoteHadoopGem.rb', line 32

def self.commandToHadoopJobID(username, host, keyPathFile, command)
  # create a file with a random name to obtained the jobID
  filename="tempJobID_"+UUIDTools::UUID.random_create.to_s
  #`ssh -n -f -i "#{keyPathFile}" "#{username}"@"#{host}" 'sh -c "export PATH=/hadoop/bin/:$PATH; cd /hadoop/; nohup #{command} >/dev/null 2>#{filename}.txt & " '`
  `ssh -i "#{keyPathFile}" "#{username}"@"#{host}" 'sh -c "export PATH=/hadoop/bin/:$PATH; cd /hadoop/; nohup #{command} >/dev/null 2>#{filename}.txt & " '`
  res=`sleep 10; ssh -i "#{keyPathFile}" "#{username}"@"#{host}" "cat /hadoop/#{filename}.txt | grep 'Running job' " `
  `ssh -i "#{keyPathFile}" "#{username}"@"#{host}" "rm /hadoop/#{filename}.txt"`
  jobid=res.split[6]
  
  return "#{jobid}"
end

.copyFileTo(username, host, keyPathFile, filePath, destFilePath) ⇒ Object

****** copyFileTo ******

function to copy a file in a remote hadoop machine require: 1) username (to access the machine via ssh) 2) host (IP of the hadoop machine) 3) keyPathFile (path of the private key to access the machine) 4) filePath (path of the local file) 5) destFilePath (path on the remote hadoop node)



55
56
57
 
# File 'lib/remoteHadoopGem.rb', line 55

def self.copyFileTo(username, host, keyPathFile, filePath, destFilePath)
  res=`scp -r -i "#{keyPathFile}" -o StrictHostKeyChecking=no #{filePath}  "#{username}"@"#{host}":#{destFilePath}`
end

.jobsList(username, host, keyPathFile) ⇒ Object

****** jobsList ******

function to list the running jobs in a remote hadoop machine require: 1) username (to access the machine via ssh) 2) host (IP of the hadoop machine) 3) keyPathFile (path of the private key to access the machine)



85
86
87
88
 
# File 'lib/remoteHadoopGem.rb', line 85

def self.jobsList(username, host, keyPathFile)
  res=`ssh -i "#{keyPathFile}" -o StrictHostKeyChecking=no "#{username}"@"#{host}" "export PATH=/hadoop/bin/:$PATH; cd /hadoop/; hadoop job -list "`
  return "#{res}"
end

.jobStatus(username, host, keyPathFile, job_id) ⇒ Object

****** jobStatus ******

function to read the status of a running job in a remote hadoop machine require: 1) username (to access the machine via ssh) 2) host (IP of the hadoop machine) 3) keyPathFile (path of the private key to access the machine) 4) job_id (id of the job)



101
102
103
104
 
# File 'lib/remoteHadoopGem.rb', line 101

def self.jobStatus(username, host, keyPathFile, job_id)
  res=`ssh -i "#{keyPathFile}" -o StrictHostKeyChecking=no "#{username}"@"#{host}" "export PATH=/hadoop/bin/:$PATH; cd /hadoop/; hadoop job -status #{job_id} "`
  return "#{res}"
end

.readFileFrom(username, host, keyPathFile, destFilePath) ⇒ Object

****** readFileFrom ******

function to read a file from a remote hadoop machine require: 1) username (to access the machine via ssh) 2) host (IP of the hadoop machine) 3) keyPathFile (path of the private key to access the machine) 4) destFilePath (path of the remote file to read)



70
71
72
73
 
# File 'lib/remoteHadoopGem.rb', line 70

def self.readFileFrom(username, host, keyPathFile, destFilePath)
  res=`ssh -i "#{keyPathFile}" -o StrictHostKeyChecking=no "#{username}"@"#{host}" "cat #{destFilePath}"`
  return "#{res}"
end

.tryOne ⇒ Object

****** commandToHadoopJobID ******

function to run a command in a remote hadoop machine; returns the <job-id> require: 1) username (to access the machine via ssh) 2) host (IP of the hadoop machine) 3) keyPathFile (path of the private key to access the machine) 4) command to execute



29
30
31
 
# File 'lib/remoteHadoopGem.rb', line 29

def self.tryOne()
  return "yO!"
end