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https://issues.apache.org/jira/browse/HBASE-6295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13698174#comment-13698174
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Lars Hofhansl commented on HBASE-6295:
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Agreed. The main difference was the block cache size anyway. With the same
setting there 0.94 is faster than 0.95, which at this point makes sense.
> 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, 0.95.2
>
> Attachments: 6295.addendum.patch, 6295.v11.patch, 6295.v12.patch,
> 6295.v14.patch, 6295.v15.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,
> hbase-ycsb-workloads Build time trend.png
>
>
> 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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