Research on Namenode Single Point of Fault Solution
Deng Hong Peng, Meiyi Li, Cheng He · Jisuanji gongcheng · 2012
(Abstract )Based on the analysis of the Secondary Namenode mechanism, Backup Node mechanism and Facebook Avatar mechanism, an improved scheme of Avatar is proposed to solve the Single Point of Fault(SPOF)of Namenode existing in Hadoop Distributed File System(HDFS) which is a distributed file system of Hadoop. Client request is transmitted from the master node to standby node, and the Zookeeper is used to take over failover. And then the SPOF of Namenode is solved. The correctness of this program is verified by Petri net modal in theory and the quantitative analysis of its availability is conducted by storage network fault repairing model based on finite element method. Experimental result demonstrates the advantages of this program which are nonvolatile, fast failover and automatic failover. (Key words )cloud computing; Single Point of Fault(SPOF); Hadoop Distributed File System(HDFS); High Availability(HA); Petri net; fault recovery