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From "Nicolas Liochon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6295) Possible performance improvement in client batch operations: presplit and send in background
Date Fri, 26 Apr 2013 18:14:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13643087#comment-13643087
] 

Nicolas Liochon commented on HBASE-6295:
----------------------------------------

v4. I added a control per server: the client cannot have more than X request on a same server.
If this number is reached, we continue for the other servers, but the ones on the overloaded
servers are kept in the buffer. This will limit the rpc.timeout effect.

It's still a hack in terms on implementation, but hopefully it's acceptable in terms of feature.
I've got some tests running locally, I will do one on a real cluster if they are ok.
                
> 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
>         Attachments: 6295.v1.patch, 6295.v2.patch, 6295.v3.patch, 6295.v4.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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