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https://issues.apache.org/jira/browse/HDFS-2699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13171660#comment-13171660
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Allen Wittenauer commented on HDFS-2699:
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Would it make sense to make the equivalent of a logging device instead? In
other words, put the meta files on a dedicated fast/small disk to segregate
them from the actual data blocks? Besides just being able to pick a better
storage medium, it might potentially allow for better caching strategies at the
OS level (depending upon the OS of course).
> Store data and checksums together in block file
> -----------------------------------------------
>
> 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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