Abstraction and Motivation The only single point of failure (SPOF) in HDFS is on the most important node â NameNode. If it fails, the ongoing operations will fail and user data may be lost. In 2008, we (team from China Mobile Research Institute) have implemented an initial version of Name-Node Cluster (NNC) on hadoop 0.17. NNC introduced a Synchronization Agent, which synchronizes the updates of F
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