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https://issues.apache.org/jira/browse/HBASE-6295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13698771#comment-13698771
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Elliott Clark commented on HBASE-6295:
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Ahhhh, I get it now. I think #2 probably had the most impact here.
On the subject of settings: I opened up HBASE-8810 to bring the constants in
line with what's in our hbase-defaults.xml.
bq.I personally think that we should get rid of the hbase-*.xml in our package
to be sure we're using the code defaults. Today, we have:
I would disagree. The xml is really useful for users to find important
settings and their defaults without having to look through the entire code
base. I do agree that we should combine all of the test hbase-site.xml's into
one so that there's less confusion on which is being used.
> 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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