}
if (doPreWarm) {
LOG.info("Pre-warming Session");
PreWarmVertex preWarmVertex = PreWarmVertex.create("PreWarm", preWarmNumContainers, dag
.getVertex("initialmap").getTaskResource());
preWarmVertex.addTaskLocalFiles(dag.getVertex("initialmap").getTaskLocalFiles());
preWarmVertex.setTaskEnvironment(dag.getVertex("initialmap").getTaskEnvironment());
preWarmVertex.setTaskLaunchCmdOpts(dag.getVertex("initialmap").getTaskLaunchCmdOpts());
tezSession.preWarm(preWarmVertex);
}