'JobLinkage(jobtracker, jobid) -> JobLinkage
The jobid is the jobid string (not the thrift jobid)'

def __init__(self, jobtracker, jobid):

    self._jobtracker = jobtracker
    self.jobId = jobid
    self.jobId_short = '_'.join(jobid.split('_')[(-2):])
    self.is_mr2 = False
