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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-6295) Possible performance improvement in client batch operations: presplit and send in background
Date Mon, 02 Jul 2012 12:58:22 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-6295:
-------------------------

    Component/s: performance
           Tags: noob
         Labels: noob  (was: )

Making it noob.  Could be fun project for someone who wants to do something a little involved.
                
> 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: 0.96.0
>            Reporter: nkeywal
>              Labels: noob
>
> 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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