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Hdfs stores data using commodity hardware which has higher chances of failures. So, how hdfs ensures the fault tolerance capability of the system?
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Answer Posted / Anil Kumar Verma
HDFS ensures fault tolerance by replicating each block across multiple DataNodes. By default, HDFS stores three copies of each data block to ensure that a single point of failure does not cause data loss. Additionally, HDFS relies on the NameNode's journal for logging all file system changes and recovers from failures using this log.
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