For intra-row scanning, the update readers notification resets the query
matcher and can lead to incorrect behavior
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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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