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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2517) During reads when passed the specified time range, seek to next column
Date Wed, 02 Jun 2010 01:17:37 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12874357#action_12874357
] 

Jonathan Gray commented on HBASE-2517:
--------------------------------------

Similar but different.  This jira is specifically about some of the QueryMatcher return codes
and ensuring they are optimal and return NEXT_COL and NEXT_ROW when appropriate given a TimeRange.

HBASE-2450 deals with actually seeking the HFile.

These two are related, however.  We should be passing in stuff like NEXT_COL and NEXT_ROW
down to the HFiles to do re-seeking where appropriate (when it means jumping to another block).
 There's a JIRA for that.

> During reads when passed the specified time range, seek to next column
> ----------------------------------------------------------------------
>
>                 Key: HBASE-2517
>                 URL: https://issues.apache.org/jira/browse/HBASE-2517
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Jonathan Gray
>             Fix For: 0.21.0
>
>
> When we are processing the stream of KeyValues in the ScanQueryMatcher, we will check
the timestamp of the current KV against the specific TimeRange.  Currently we only check if
it is in the range or not, returning SKIP if outside the range or continuing to other checks
if within the range.
> The check should actually return SKIP if the stamp is greater than the TimeRange and
NEXT_COL if the stamp is less than the TimeRange (we know we won't take anymore columns from
the current column once we are below the TimeRange).

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