@Override
  public void unblacklistNode(NodeId nodeId) {
    LOG.info("unBlacklistNode not supported");
    // TODO: See comments under blacklistNode.
  }
The difference between this and getTotalResources() is that this only gives currently free
resource instances, while the other lists all the instances that may become available in a
while.
llap-tez/src/java/org/apache/hadoop/hive/llap/tezplugins/LlapTaskSchedulerService.java