[jira] Updated: (HBASE-3416) For intra-row scanning, the update readers notification resets the query matcher and can lead to incorrect behavior

["Andrew Purtell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-3416?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Purtell updated HBASE-3416:
----------------------------------

    Attachment: HBASE-3416.patch

First stab at the problem. All existing unit tests pass. Need also a test of intra row scanning with reader change to confirm.


> 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: 0.90.0
>            Reporter: Jonathan Gray
>             Fix For: 0.90.1
>
>         Attachments: HBASE-3416.patch
>
>
> 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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