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https://issues.apache.org/jira/browse/HBASE-2362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12848379#action_12848379
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Jean-Daniel Cryans commented on HBASE-2362:
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+1
> Improve gets/scans when all columns of a key is requested.
> ----------------------------------------------------------
>
> Key: HBASE-2362
> URL: https://issues.apache.org/jira/browse/HBASE-2362
> Project: Hadoop HBase
> Issue Type: Improvement
> Components: regionserver
> Reporter: Karthik Ranganathan
>
> Right now, we get one KeyValue at a time and run it through the matcher even
> if the query is to fetch the entire row (or even an entire column family for
> a key). This causes the blocks to be fetched serially from HDFS. We can
> optimize this by looking at the block map, and fetching all the blocks
> spanned by the key in one request to HDFS.
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