willoop try to create lost replications on other live nodes? or just do nothing (since there are still 2 replicas left).
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Apache HDFS:
DataNode Heartbeat NameNode. , DataNodes NameNode. NameNode - Heartbeat. NameNode DataNodes Heartbeats -. , DataNode, HDFS. DataNode , . NameNode , , . The necessity for re-replication may arise due to many reasons: a DataNode may become unavailable, a replica may become corrupted, a hard disk on a DataNode may fail, or the replication factor of a file may be increased.