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https://issues.apache.org/jira/browse/HBASE-6295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13668430#comment-13668430
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stack commented on HBASE-6295:
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Are the above failures because of the patch?
The new class needs a license.
Great class doc on the the new AsyncProcess class
Does AsyncProcessCallback have to be public? Is it only used inside the client
package? If so, shut down access.
We need these atomics + AtomicInteger ct =
taskCounterPerRegion.get(encodedRegionName);? It is single threaded access
right? Or you need it for internals?
Why we need to add this, updateCachedLocations, if its internally used? It
means you can use HConnection in more places instead of HCI?
Is this a Result or not?
+ static class MyAsyncProcess<Res> extends AsyncProcess<Res> {
If so, why not Result? If not and it is just generic, just R? Res confuses.
I love the test for the new class.
Excellent.
+1 after fixing unit tests.
> 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.v1.patch, 6295.v2.patch, 6295.v3.patch,
> 6295.v4.patch, 6295.v5.patch, 6295.v6.patch, 6295.v8.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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