Store data and checksums together in block file
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Key: HDFS-2699
URL: https://issues.apache.org/jira/browse/HDFS-2699
Project: Hadoop HDFS
Issue Type: Improvement
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 from HDFS
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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