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Message-ID: <2269256.73411277538710158.JavaMail.jira@thor>
Date: Sat, 26 Jun 2010 03:51:50 -0400 (EDT)
From: "Kannan Muthukkaruppan (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Subject: [jira] Commented: (HBASE-2794) ROWCOL bloom filter not used if
 multiple columns within same family are requested in a Get
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    [ https://issues.apache.org/jira/browse/HBASE-2794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12882820#action_12882820 ] 

Kannan Muthukkaruppan commented on HBASE-2794:
----------------------------------------------

Perhaps a simple starter task for someone interested.

> ROWCOL bloom filter not used if multiple columns within same family are requested in a Get
> ------------------------------------------------------------------------------------------
>
>                 Key: HBASE-2794
>                 URL: https://issues.apache.org/jira/browse/HBASE-2794
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Kannan Muthukkaruppan
>
> Noticed the following snippet in StoreFile.java:Scanner:shouldSeek():
> {code}
>         switch(bloomFilterType) {
>           case ROW:
>             key = row;
>             break;
>           case ROWCOL:
>             if (columns.size() == 1) {
>               byte[] col = columns.first();
>               key = Bytes.add(row, col);
>               break;
>             }
>             //$FALL-THROUGH$
>           default:
>             return true;
>         }
> {code}
> If columns.size > 1, then we currently don't take advantage of the bloom filter.  We should optimize this to check bloom for each of columns and if none of the columns are present in the bloom avoid opening the file.

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