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https://issues.apache.org/jira/browse/HBASE-5074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13226438#comment-13226438
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Lars Hofhansl commented on HBASE-5074:
--------------------------------------
Actually
svn diff -r r1298574:r1298641
gives me a diff of size different from the attached D1521.14.patch (I can't
diff the patch files easily, as files are reordered)
Mikhail, are you sure D1521.14.patch is the exact committed patch?
> 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
> Fix For: 0.94.0, 0.96.0
>
> Attachments: 5074-0.94.txt, D1521.1.patch, D1521.1.patch,
> D1521.10.patch, D1521.10.patch, D1521.10.patch, D1521.10.patch,
> D1521.10.patch, D1521.11.patch, D1521.11.patch, D1521.12.patch,
> D1521.12.patch, D1521.13.patch, D1521.13.patch, D1521.14.patch,
> D1521.14.patch, D1521.2.patch, D1521.2.patch, D1521.3.patch, D1521.3.patch,
> D1521.4.patch, D1521.4.patch, D1521.5.patch, D1521.5.patch, D1521.6.patch,
> D1521.6.patch, D1521.7.patch, D1521.7.patch, D1521.8.patch, D1521.8.patch,
> D1521.9.patch, D1521.9.patch
>
>
> 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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