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https://issues.apache.org/jira/browse/HBASE-6295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13628203#comment-13628203
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Nicolas Liochon commented on HBASE-6295:
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It's still in a hacky way. Needs some work be be clean. I need to write some
unit tests, I'm sure this implementation is still buggy.
What I would like to keep is the logic I've finally implemented:
- when we send the buffered writes to the regionservers, we don't stop except
if we have to, i.e: we have too much tasks in progress or we ran out of retries.
- we don't have this terrible Object[] to send back the results. Actually, in
most methods, they are never used anyway.
- we don't keep the buffer for failed operation. In other words,
clearBufferOnFail would always be true (it's already the default).
If it works, it means we won't be slow down by the slowest region server
anymore.
> 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
>
>
> 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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