support checksums in HBase block cache
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Key: HBASE-5074
URL: https://issues.apache.org/jira/browse/HBASE-5074
Project: HBase
Issue Type: Improvement
Components: regionserver
Reporter: dhruba borthakur
Assignee: dhruba borthakur
The current implementation of HDFS stores the data in one block file and the
metadata(checksum) in another block file. This means that every read into the
HBase block cache actually consumes two disk iops, one to the datafile and one
to the checksum file. This is a major problem for scaling HBase, because HBase
is usually bottlenecked on the number of random disk iops that the
storage-hardware offers.
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