Namenode usually checks for the jobs running on the datanodes, of which tasktrackers keep a track of and decides if it still busy running a task. On May 19, 2015 14:23, "rajesh damera" <[email protected]> wrote:
> 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 >> >> >
