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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2823) Entire Row Deletes not stored in Row+Col Bloom
Date Thu, 08 Jul 2010 20:43:49 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12886463#action_12886463
] 

Jonathan Gray commented on HBASE-2823:
--------------------------------------

This issue applies to DeleteFamily instances.  (like ryan says, we have no delete row)

The issue is that a DeleteFamily applies to all columns.  In a row+col bloom, you may not
include a file which includes a DeleteFamily because that file doesn't contain any instances
of the column you are looking for.  To ensure that file would be included, we should include
a key into the row+col bloom of just the row, and when checking the blooms, we should check
each for row+col and for row.  Note, this only applies to row+col, and in this case it is
_only_ the DeleteFamilys that should add an additional key to the bloom.

> Entire Row Deletes not stored in Row+Col Bloom
> ----------------------------------------------
>
>                 Key: HBASE-2823
>                 URL: https://issues.apache.org/jira/browse/HBASE-2823
>             Project: HBase
>          Issue Type: Bug
>          Components: filters, regionserver
>    Affects Versions: 0.21.0
>            Reporter: Nicolas Spiegelberg
>             Fix For: 0.21.0
>
>
> If the user issues a Row Delete on an family with Row+Col blooms, that information is
not currently detected by shouldSeek().  Possible known solutions are:
> 1. adding Row as Bloom Filter Key on Row Delete, shouldSeek() should do both a Row &
Row+Col query for Row+Col filters.
> 2. keep delete information in a separate storage element.
> #1 seems like the best solution, but need to investigate further and fix this problem.

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