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https://issues.apache.org/jira/browse/HBASE-5074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13223586#comment-13223586
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dhruba borthakur commented on HBASE-5074:
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I ran all four of them individually (manually), and all four of them pass.
Looking at the Hudson test results, it appears that all the failures are
related to some map-reduce problem, but not really sure the precise cause. But
I think that these failures are somehow related to this patch, especially
because the Hudson tests for HBASE-5399 just passed successfully. Will
investigate more (but if you have any clues, please do let me know).
> 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
>
> Attachments: 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, D1521.2.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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