How hdfs high availability works

[@tapobanjit]

First of all your fsimage is not present on the shared storage (i.e Journal Nodes), it only contains edit logs which records changes in HDFS fs. Both the active as well as standby NNs store the fsimage on the local disk hosting the daemons.

[@monalisa.amohapatra9328]

Thanks for sharing your knowledge with proper explanation. just wanted to know ..Does it mean.. we can only store metadata maximum size of ram of active name node.

[@nxtbigthing3012]

what about that shared directory on NFS goes down?

[@Selfreflex]

You lose HA for that duration!