In the current implementation, a checkpoint only occurs when the NameNode starts up. Work is in progress to support periodic checkpointing in the near future.

在当前实现中，checkpoint只发生在Namenode启动时，在不久的将来我们将实现支持周期性的checkpoint。

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On the seventh day of the race, Buser was first out of the checkpoint at Eagle Island, where a single cabin is the only dwelling in the otherwise uninhabited stretch of trail.

NPR: Iditarod Front-Runner Hopes To Claim 5th Win