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https://issues.apache.org/jira/browse/HBASE-2794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12887277#action_12887277
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HBase Review Board commented on HBASE-2794:
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Message from: "Kris Jirapinyo" <kjirapi...@attensity.com>
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This is an automatically generated e-mail. To reply, visit:
http://review.hbase.org/r/296/
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Review request for hbase.
Summary
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HBASE-2794 Enable bloom filter checks for multiple columns in same column family
This addresses bug HBASE-2794.
http://issues.apache.org/jira/browse/HBASE-2794
Diffs
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/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/StoreFile.java
962748
/trunk/src/test/java/org/apache/hadoop/hbase/regionserver/TestStoreFile.java
962748
Diff: http://review.hbase.org/r/296/diff
Testing
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Ran and passed org.apache.hadoop.hbase.regionserver.TestStoreFile multiple
times. Ran and passed all tests when building.
Thanks,
Kris
> 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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