What do you mean by safe mode in Hadoop?

1.	What do you mean by safe mode in Hadoop?
Answer» In Apache Hadoop, SAFE mode is a mode that is used for the PURPOSE of MAINTENANCE. It acts as read-only mode for NameNode in order to AVOID any modifications to the file systems. During Safe mode in HDFS, Data blocks can’t be replicated or deleted. COLLECTION of data and statistics from all the DataNodes happen during this time.

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