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https://issues.apache.org/jira/browse/HBASE-5074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13172967#comment-13172967
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dhruba borthakur commented on HBASE-5074:
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The corresponding HDFS jira is HDFS-2699.
Another alternative proposal is to store store a checksum in the block header
of every hbase block. HBase will make a pread(noChecksumVerify) call to hdfs
for random reads. Once the block is read into the hbase cache, it will verify
the checksum and if not valid, have to use a new HDFS api to read in contents
from another hdfs replica.
> 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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