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https://issues.apache.org/jira/browse/HBASE-2496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861667#action_12861667
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stack commented on HBASE-2496:
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+1
> Less ArrayList churn on the scan path
> -------------------------------------
>
> Key: HBASE-2496
> URL: https://issues.apache.org/jira/browse/HBASE-2496
> Project: Hadoop HBase
> Issue Type: Improvement
> Affects Versions: 0.20.3
> Reporter: Jean-Daniel Cryans
> Assignee: Jean-Daniel Cryans
> Fix For: 0.20.5, 0.21.0
>
> Attachments: HBASE-2496.patch
>
>
> Doing some profiling when testing the scanning speed of 0.20.4, I saw that we
> are spending a lot of time instantiating ArrayLists when scanning and that we
> could sometime set the right size of the arrays. I don't expect big
> improvements for short scans, but people like us who are scanning in batches
> of 10k could get some nice speedups.
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