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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3416) For intra-row scanning, the update readers notification resets the query matcher and can lead to incorrect behavior
Date Wed, 05 Jan 2011 15:50:45 GMT
For intra-row scanning, the update readers notification resets the query matcher and can lead
to incorrect behavior
-------------------------------------------------------------------------------------------------------------------

                 Key: HBASE-3416
                 URL: https://issues.apache.org/jira/browse/HBASE-3416
             Project: HBase
          Issue Type: Bug
          Components: regionserver
    Affects Versions: 0.20.7, 0.90.0
            Reporter: Jonathan Gray
             Fix For: 0.90.1


In {{StoreScanner.resetScannerStack()}}, which is called on the first {{next()}} call after
readers have been updated, we do a query matcher reset.  Normally this is not an issue because
the query matcher does not need to maintain state between rows.  However, if doing intra-row
scanning w/ the specified limit, we could have the query matcher reset in the middle of reading
a row.  This could lead to incorrect behavior (too many versions coming back, etc).

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