[jira] [Assigned] (HBASE-2794) ROWCOL bloom filter not used if multiple columns within same family are requested in a Get

["Ted Yu (Assigned) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-2794?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ted Yu reassigned HBASE-2794:
-----------------------------

    Assignee: Mikhail Bautin
    
> 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
>          Components: performance
>            Reporter: Kannan Muthukkaruppan
>            Assignee: Mikhail Bautin
>             Fix For: 0.92.0
>
>
> 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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira