Method for realizing HDFS high-availability scheme

The present invention relates to a method for realizing an HDFS (Hadoop Distributed File System) high-availability scheme by using a hot standby NameNode. According to the method of the present invention, on the basis of an original HDFS configuration, one hot standby NameNode node, i.e., Standby NameNode, is introduced; the system maintains consistency of name spaces by continuously synchronizing metadata in a memory of an Active NameNode and metadata in a memory of the Standby NameNode; when the NameNode is switched, only data in Editlog is imported, thereby shortening the time required for switching of the HDFS; and when the Active NameNode is dropped and unusable, the system can automatically and quickly switch to the Standby NameNode. The method of the present invention can provide high-availability service for the HDFS.