List the actions that happen when a DataNode fails.

1.	List the actions that happen when a DataNode fails.
Answer» Both the Jobtracker and the name node DETECT the failure on which blocks were the DataNode FAILED. On the failed node all the tasks are rescheduled by locating other DataNodes with copies of these blocks User’s DATA will be replicated to another node from namenode to maintain the CONFIGURED replication factor.

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