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From "Jean-Marc Spaggiari (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6295) Possible performance improvement in client batch operations: presplit and send in background
Date Mon, 17 Jun 2013 12:23:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13685492#comment-13685492
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Jean-Marc Spaggiari commented on HBASE-6295:
--------------------------------------------

Here are the results for your version:

org.apache.hadoop.hbase.PerformanceEvaluation$RandomReadTest 728486.5
org.apache.hadoop.hbase.PerformanceEvaluation$RandomScanWithRange100Test 22197.4
org.apache.hadoop.hbase.PerformanceEvaluation$RandomSeekScanTest 137125.4
org.apache.hadoop.hbase.PerformanceEvaluation$RandomWriteTest 69712
org.apache.hadoop.hbase.PerformanceEvaluation$SequentialWriteTest 24342.1

Trunk:
org.apache.hadoop.hbase.PerformanceEvaluation$RandomReadTest 757343.8
org.apache.hadoop.hbase.PerformanceEvaluation$RandomScanWithRange100Test 21856.6
org.apache.hadoop.hbase.PerformanceEvaluation$RandomSeekScanTest 134333
org.apache.hadoop.hbase.PerformanceEvaluation$RandomWriteTest 112591.3
org.apache.hadoop.hbase.PerformanceEvaluation$SequentialWriteTest 77897.975

Comparaison (The smaller the better):
org,apache,hadoop,hbase,PerformanceEvaluation$RandomReadTest 	-4%
org,apache,hadoop,hbase,PerformanceEvaluation$RandomScanWithRange100Test	2%
org,apache,hadoop,hbase,PerformanceEvaluation$RandomSeekScanTest 	2%
org,apache,hadoop,hbase,PerformanceEvaluation$RandomWriteTest	-62%
org,apache,hadoop,hbase,PerformanceEvaluation$SequentialWriteTest 	-220%

I now have IntegrationTestBigLinkedList running and will run more. I keep you posted.
                
> Possible performance improvement in client batch operations: presplit and send in background
> --------------------------------------------------------------------------------------------
>
>                 Key: HBASE-6295
>                 URL: https://issues.apache.org/jira/browse/HBASE-6295
>             Project: HBase
>          Issue Type: Improvement
>          Components: Client, Performance
>    Affects Versions: 0.95.2
>            Reporter: Nicolas Liochon
>            Assignee: Nicolas Liochon
>              Labels: noob
>             Fix For: 0.98.0
>
>         Attachments: 6295.v11.patch, 6295.v12.patch, 6295.v1.patch, 6295.v2.patch, 6295.v3.patch,
6295.v4.patch, 6295.v5.patch, 6295.v6.patch, 6295.v8.patch, 6295.v9.patch
>
>
> today batch algo is:
> {noformat}
> for Operation o: List<Op>{
>   add o to todolist
>   if todolist > maxsize or o last in list
>     split todolist per location
>     send split lists to region servers
>     clear todolist
>     wait
> }
> {noformat}
> We could:
> - create immediately the final object instead of an intermediate array
> - split per location immediately
> - instead of sending when the list as a whole is full, send it when there is enough data
for a single location
> It would be:
> {noformat}
> for Operation o: List<Op>{
>   get location
>   add o to todo location.todolist
>   if (location.todolist > maxLocationSize)
>     send location.todolist to region server 
>     clear location.todolist
>     // don't wait, continue the loop
> }
> send remaining
> wait
> {noformat}
> It's not trivial to write if you add error management: retried list must be shared with
the operations added in the todolist. But it's doable.
> It's interesting mainly for 'big' writes

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