[
https://issues.apache.org/jira/browse/HBASE-20636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17165113#comment-17165113
]
Alex Batyrshin commented on HBASE-20636:
----------------------------------------
Any ideas why this feature only works at scanner opening time and not inside
scan with StoreFileScanner.requestSeek() ?
The only bloom that is used inside already opened scan is ROWCOL -
[https://github.com/apache/hbase/blob/branch-2/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreFileScanner.java#L384-L396]
> Introduce two bloom filter type : ROWPREFIX_FIXED_LENGTH and
> ROWPREFIX_DELIMITED
> --------------------------------------------------------------------------------
>
> Key: HBASE-20636
> URL: https://issues.apache.org/jira/browse/HBASE-20636
> Project: HBase
> Issue Type: New Feature
> Components: HFile, regionserver, Scanners
> Reporter: Guangxu Cheng
> Assignee: Guangxu Cheng
> Priority: Major
> Fix For: 3.0.0-alpha-1, 2.2.0
>
> Attachments: HBASE-20636.master.001.patch,
> HBASE-20636.master.002.patch, HBASE-20636.master.003.patch,
> HBASE-20636.master.004.patch, HBASE-20636.master.005.patch
>
>
> As we all know, HBase uses BloomFilter(ROW and ROWCOL) to filter unnecessary
> files to improve read performance. But they only support Get and do not
> support Scan.
> In our company(Tencent), many users need to scan all rows with the same
> prefix, such as Tencent Game. Game user's some operational record will be
> written into HBase, each game user will have a lot of records, the rowkey is
> constructed as userid+'#'+timestamps. So we can scan all records for a given
> user for a specified period.
> For this scenario, we designed the prefix Bloom filter. If the startRow and
> stopRow of the Scan has a valid common prefix, the scan will be allowed to
> use BloomFilter to filter files which will enhance the performance of the
> scan.
> Now, this feature has been running on our cluster over a year, and scan
> performance for this scenario has been improved by more than one times than
> before.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
