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Date: Wed, 18 Sep 2013 23:50:52 +0000 (UTC)
From: "stack (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12539420.1327301487127.159022.1379548252423@arcas>
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Subject: [jira] [Updated] (HBASE-5257) Allow INCLUDE_AND_NEXT_COL in filters
 and use it in ColumnPaginationFilter
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     [ https://issues.apache.org/jira/browse/HBASE-5257?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HBASE-5257:
-------------------------

    Component/s: Performance
                 Filters
    
> Allow INCLUDE_AND_NEXT_COL in filters and use it in ColumnPaginationFilter
> --------------------------------------------------------------------------
>
>                 Key: HBASE-5257
>                 URL: https://issues.apache.org/jira/browse/HBASE-5257
>             Project: HBase
>          Issue Type: Improvement
>          Components: Filters, Performance
>            Reporter: Lars Hofhansl
>            Assignee: Varun Sharma
>             Fix For: 0.94.3, 0.95.0
>
>         Attachments: 5257-0.92.addendum, 5257-trunk.txt, 5257-trunk-v2.txt, HBASE-5257-0.92.txt, HBASE-5257-0.94.txt
>
>
> There are various usecases and filter types where evaluating the filter before version are handled either do not make sense, or make filter handling more complicated.
> Also see this comment in ScanQueryMatcher:
> {code}
>     /**
>      * Filters should be checked before checking column trackers. If we do
>      * otherwise, as was previously being done, ColumnTracker may increment its
>      * counter for even that KV which may be discarded later on by Filter. This
>      * would lead to incorrect results in certain cases.
>      */
> {code}
> So we had Filters after the column trackers (which do the version checking), and then moved it.
> Should be at the discretion of the Filter.
> Could either add a new method to FilterBase (maybe excludeVersions() or something). Or have a new Filter wrapper (like WhileMatchFilter), that should only be used as outmost filter and indicates the same (maybe ExcludeVersionsFilter).
> See latest comments on HBASE-5229 for motivation.

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