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HBase >> mail # user >> Hbase performance with HDFS

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Hbase performance with HDFS
I've been trying to understand how Hbase can provide good performance
using HDFS when purpose of HDFS is sequential large block sizes which
is inherently different than of Hbase where it's more random and row
sizes might be very small.

I am reading this but doesn't answer my question. It does say that
HFile block size is different but how it really works with HDFS is
what I am trying to understand.