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Which feature of HBase ensures predictable disk head seek performance within a RegionServer?

Which feature of HBase ensures predictable disk head seek performance within a RegionServer?

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A.
Data is stored distributed in HDFS

B.
Data stored in HBase is sparse

C.
Data is stored sorted on row keys

D.
Data is stored as an uninterpreted array of bytes

Explanation:
HBase tables are always sorted by row key.

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