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https://issues.apache.org/jira/browse/HBASE-9769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13801214#comment-13801214
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Lars Hofhansl commented on HBASE-9769:
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Some comments:
* shouldUseExplicitColumnFilter is misnamed. It has the side effect of adding
the filter.
* Curious how much slower just using HashMap was instead of having your own
bucket array.
* I think this would be cleaner if the Filter would be a proper filter that can
serialized (i.e. protoful in trunk and readFields/write in 0.94). (FYI. I am
debating the same in HBASE-9272. The parallel scanner could just be a sample
scanner to use, or it could automatically triggered, but it is still 100%
client side in either case)
> Improve performance of a Scanner with explicit column list when rows are
> small/medium size
> ------------------------------------------------------------------------------------------
>
> Key: HBASE-9769
> URL: https://issues.apache.org/jira/browse/HBASE-9769
> Project: HBase
> Issue Type: Improvement
> Components: Scanners
> Affects Versions: 0.98.0, 0.94.12, 0.96.0
> Reporter: Vladimir Rodionov
> Assignee: Vladimir Rodionov
> Attachments: 9769-0.94-sample1.txt, 9769-0.94-sample2.txt,
> 9769-0.94-sample.txt, 9769-94.txt, 9769-94-v2.txt, 9769-trunk-v1.txt,
> 9769-trunk-v2.txt, 9769-trunk-v3.txt, 9769-trunk-v4.txt
>
>
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