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Date: Wed, 4 Sep 2013 17:56:54 +0000 (UTC)
From: "Lars Hofhansl (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12666806.1378255740635.79103.1378317414923@arcas>
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References: <JIRA.12666806.1378255740635@arcas>
Subject: [jira] [Updated] (HBASE-9428) Regex filters are at least an order
 of magnitude slower since 0.94.3
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     [ https://issues.apache.org/jira/browse/HBASE-9428?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl updated HBASE-9428:
---------------------------------

    Attachment: 9428-trunk.txt

Same for trunk.
                
> Regex filters are at least an order of magnitude slower since 0.94.3
> --------------------------------------------------------------------
>
>                 Key: HBASE-9428
>                 URL: https://issues.apache.org/jira/browse/HBASE-9428
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Jean-Daniel Cryans
>             Fix For: 0.98.0, 0.94.12, 0.96.1
>
>         Attachments: 9428-0.94.txt, 9428-trunk.txt
>
>
> I found this issue after debugging a performance problem on an OpenTSDB cluster, it was basically unusable after an upgrade from 0.94.2 to 0.94.6. It was caused by HBASE-7279 (ping [~lhofhansl]).
> The easiest way to see it is to run a simple 1 client PE:
> {noformat}
> $ ./bin/hbase org.apache.hadoop.hbase.PerformanceEvaluation sequentialWrite 1
> {noformat}
> Then in the shell do a filter scan (flush the table first and make sure if fits in your blockcache if you want stable numbers).
> Pre HBASE-7279:
> {noformat}
> hbase(main):028:0> scan 'TestTable', {FILTER => "(RowFilter (=, 'regexstring:0000055872') )"}
> ROW                                                 COLUMN+CELL                                                                                                                                         
>  0000055872                                         column=info:data, timestamp=1378248850191, value=(blanked)                                                                                                                                    
> 1 row(s) in 1.2780 seconds
> {noformat}
> Post HBASE-7279
> {noformat}
> hbase(main):037:0* scan 'TestTable', {FILTER => "(RowFilter (=, 'regexstring:0000055872') )"}
> ROW                                                 COLUMN+CELL                                                                                                                                         
>  0000055872                                         column=info:data, timestamp=1378248850191, value=(blanked)                                                                                                                                      
> 1 row(s) in 24.2940 seconds
> {noformat}
> I tried a bunch of 0.94, up to 0.94.11, and the tip of 0.96. They are all slow like this.
> It seems that since that jira went in we do a lot more row matching, and running the regex gets super expensive.

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