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From "Mikhail Bautin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6562) Fake KVs are sometimes passed to filters
Date Thu, 03 Jan 2013 19:56:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13543234#comment-13543234
] 

Mikhail Bautin commented on HBASE-6562:
---------------------------------------

This does not seem to be a problem with lazy seek, this is a problem with the multi-column
Bloom filter optimization (although that could be considered a "second-level lazy seek").

The result of createLastOnRowCol should also have timestamp=MINIMUM_TIMESTAMP, so it might
be safer to check for the 
combination of minimum type/timestamp. Another solution might be to pass a flag to requestSeek
to indicate that the multi-column Bloom filter optimization should also be disabled when doing
the initial seek.

                
> Fake KVs are sometimes passed to filters
> ----------------------------------------
>
>                 Key: HBASE-6562
>                 URL: https://issues.apache.org/jira/browse/HBASE-6562
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>            Priority: Minor
>             Fix For: 0.96.0
>
>         Attachments: 6562.txt, 6562-v2.txt, 6562-v3.txt, 6562-v4.txt, minimalTest.java
>
>
> In internal tests at Salesforce we found that fake row keys sometimes are passed to filters
(Filter.filterRowKey(...) specifically).
> The KVs are eventually filtered by the StoreScanner/ScanQueryMatcher, but the row key
is passed to filterRowKey in RegionScannImpl *before* that happens.

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