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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2362) Improve gets/scans when all columns of a key is requested.
Date Mon, 22 Mar 2010 21:55:27 GMT

    [ 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:
-------------------------------------------

+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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