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https://issues.apache.org/jira/browse/HBASE-6711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13447915#comment-13447915
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Lars Hofhansl commented on HBASE-6711:
--------------------------------------
In a microbenchmark I do see improvements after all:
Locally scanning rows with 10.000 columns... Variances are high, but without
the patch each scan (including returning to the client) takes 9-13ms. With the
patch it takes 8.5-10ms (averages per row).
> Avoid local results copy in StoreScanner
> ----------------------------------------
>
> Key: HBASE-6711
> URL: https://issues.apache.org/jira/browse/HBASE-6711
> Project: HBase
> Issue Type: Bug
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Priority: Minor
> Fix For: 0.96.0, 0.94.2
>
> Attachments: 6711-0.96-v1.txt
>
>
> In StoreScanner the number of results is limited to avoid OOMs.
> However, this is done by first adding the KV into a local ArrayList and then
> copying the entries in this list to the final result list.
> In turns out the this temporary list is only used to keep track of the size
> of the result set in this loop. Can use a simple int instead.
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