Hi, In the original MapReduce paper from Google, it mentioned that healthy workers can take over failed task from other workers. Does Hadoop has the same failure recovery strategy? Also the other question is, in the paper, it seems the nodes can be added/removed while the cluster is running jobs. How does Hadoop achieve this? Since the slave locations are saved in the file and the master doesn't know about new nodes until it restart and reload the slave list.
Thanks, Ming Yang
