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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8388) Use ROW bloom filter for scanning
Date Wed, 24 Apr 2013 02:55:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13640021#comment-13640021
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Lars Hofhansl commented on HBASE-8388:
--------------------------------------

In case anybody picks this up. The problem was that all StoreFileScanner would have a seek-key
of LAST_ON_ROW, and hence the StoreScanner KVHeap, would spin forever, because of the KV comparison
mentioned in my previous comment.
I might pick this up again, but since ROWCOL BFs *do* work, this is not critical for performance
(and I feel changing the semantics to make this work is quite risky).
                
> Use ROW bloom filter for scanning
> ---------------------------------
>
>                 Key: HBASE-8388
>                 URL: https://issues.apache.org/jira/browse/HBASE-8388
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>         Attachments: 8388-0.94-sketch.txt, 8388-0.94-v1.txt, 8388-trunk-v1.txt, 8388-trunk-v2.txt,
8388-trunk-v3.txt
>
>
> Currently only ROWCOL BFs are used during the scanning process. It seems we could make
use of ROW BFs in StoreFileScanner.requestSeek.
> See HBASE-8362 for background.

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