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From "Kannan Muthukkaruppan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2794) ROWCOL bloom filter not used if multiple columns within same family are requested in a Get
Date Sat, 26 Jun 2010 07:51:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12882820#action_12882820
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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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