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https://issues.apache.org/jira/browse/HBASE-2794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12887501#action_12887501
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HBase Review Board commented on HBASE-2794:
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Message from: "Kannan Muthukkaruppan" <kan...@facebook.com>
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http://review.hbase.org/r/296/#review361
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/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/StoreFile.java
<http://review.hbase.org/r/296/#comment1497>
can't this loop be over "columns" itself? And then inside the loop, you
prepare one key at a time use Bytes.add(row, col). That way, you can avoid the
keyList data structure completely.
- Kannan
> 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
> Attachments: 2794_multi_column_check.txt
>
>
> 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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