Datanode availability is monitored and decided by Namenode. You usually get permissions, based on the type of user you are, to use a certain number of nodes to run your jobs. These limitations are set by administrators at user level
Warm regards Rajesh Damera On May 19, 2015 14:08, "Himawan Mahardianto" <[email protected]> wrote: > Hi guys, I know that every datanode where sending heartbeat to prove that > their alive but what method are used by namenode to decide which datanode > are available to client if all datanode where available? > > Best Regards > >
