What are the repercussions of the NameNode crash?

1.	What are the repercussions of the NameNode crash?
Answer» In an HDFS cluster, there is only one NAMENODE. This node keeps TRACK of DataNode metadata. Because there is only one NameNode in an HDFS cluster, it is the single POINT of failure. The system may become inaccessible if NameNode crashes. In a high-availability system, a PASSIVE NameNode backs up the PRIMARY one and takes over if the primary one fails.

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