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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