def __start_datanode(self, job):
self.hdfsContainerID = dockerCheckOutput(job=job,<EOL>defer=STOP,<EOL>workDir=os.getcwd(),<EOL>tool="<STR_LIT>",<EOL>dockerParameters=["<STR_LIT>",<EOL>"<STR_LIT>",<EOL>"<STR_LIT>", "<STR_LIT>"],<EOL>parameters=[self.masterIP])[:-<NUM_LIT:1>]<EOL>
Launches the Hadoop datanode.

:param job: The underlying job.