what is safemode in hadoop


Safe Mode in Hadoop 6

Safe Mode Safe Mode in hadoop is a maintenance state of NameNode during which NameNode doesn’t allow any changes to the file system. During Safe Mode, HDFS cluster is read-only and doesn’t replicate or delete blocks. At the start up of NameNode It loads the file system namespace from the last saved fsimage into its main memory and the edits log file. Applies/merges edits log file on fsimage and results […]


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