Class: RemoteHadoopGem

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

Class Method Summary collapse

Class Method Details

.cleanTempFiles(username, host, keyPathFile) ⇒ Object 



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# File 'lib/remoteHadoopGem.rb', line 104

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



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# 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

****** 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



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

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 & " '`
  res=`sleep 5; 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)



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# File 'lib/remoteHadoopGem.rb', line 52

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)



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# File 'lib/remoteHadoopGem.rb', line 82

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)



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# File 'lib/remoteHadoopGem.rb', line 98

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)



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# File 'lib/remoteHadoopGem.rb', line 67

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