A DataNode fails overnight, yet morning mobility jobs still find their input blocks. Which HDFS characteristic primarily explains that resilience?
Select an answer to reveal the explanation.
Short Explanation
Nodes die; replicas live elsewhere. That is why the morning mobility job can still run instead of waiting on a funeral for one disk.
Full Explanation
HDFS fault tolerance relies heavily on replicating blocks across multiple DataNodes. When a node fails, remaining replicas allow readers and jobs to continue, and the system can re-replicate under-replicated blocks. Single-copy storage would turn routine hardware failure into analytical outage for municipal pipelines.