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From "Karthik Ranganathan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2450) For single row reads of specific columns, seek to the first column in HFiles rather than start of row
Date Thu, 15 Apr 2010 18:34:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12857476#action_12857476
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Karthik Ranganathan commented on HBASE-2450:
--------------------------------------------

The reason that we might miss the delete is because the minor compactions do not respect deletes.
Would it be worthwhile investigating if the minor compactions can process the deletes but
leave the delete tombstone till the major compactions? 

On a broader note, it seems to me that the design and the code will get a lot simpler if we
can maintain only one compaction path (except for minors leaving behind some tombstones).
Jonathan told me this was done to make the minor compactions more efficient - do we have an
idea on how much we gain with this optimization?



> For single row reads of specific columns, seek to the first column in HFiles rather than
start of row
> -----------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-2450
>                 URL: https://issues.apache.org/jira/browse/HBASE-2450
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: io, regionserver
>            Reporter: Jonathan Gray
>             Fix For: 0.20.5, 0.21.0
>
>
> Currently we will always seek to the start of a row.  If we are getting specific columns,
we should seek to the first column in that row.

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