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From "dhruba borthakur (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5074) support checksums in HBase block cache
Date Tue, 20 Dec 2011 06:13:31 GMT
support checksums in HBase block cache
--------------------------------------

                 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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