Node. state 方法
Get the low-priority node has been preempted. Tasks which were running on the node when it was pre-empted will be rescheduled when another node becomes available. Possible values include: 'idle', 'rebooting', 'reimaging', 'running', 'unusable', 'creating', 'starting', 'waitingForStartTask', 'startTaskFailed', 'unknown', 'leavingPool', 'offline', 'preempted'.
public ComputeNodeState state()
the state value