Need some clarification about fsck missing replicas

Hi , I need to know when the missing replicas in fsck is displayed From Hadoop Definitive guide 3 we can see Missing Replicas Threse are blocks with no replicas anywhere in the cluster. page number 346 Chap 10 Administrating Hadoop. If we check the code NamenodeFsck#check() { . .

Secondary namenode is crashing and complaining about non-existing files

Hi, I have an issue with crashing secondary namenode due to a simple move operation Appreciate any ideas on the resolution ... Details bellow: I was moving old backups to a separate folder, exact command: sudo -u hdfs hadoop fs -mv /hbase-bak /backup/ and shortly after the command