Pratice of NameNode Cluster for HDFS HA » gnawux.infoAbstraction and Motivation The only single point of failure (SPOF) in HDFS is on the most important node — 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
