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https://issues.apache.org/jira/browse/HBASE-12031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14143849#comment-14143849
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Vladimir Rodionov commented on HBASE-12031:
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I submitted patch. Word of caution: this is highly experimental feature. I
have not verified that all HBase tests pass OK. In our own tests we do not see
any issues. Some additional doc and tests will follow later on today. In my own
tests (I have tested two scenarios: multiple scanners over the same region and
scanner running during compaction) I see huge difference in performance (say,
4.8 sec vs 120 sec for first test and 13 sec vs 240 sec in a second test) I
will publish complete report today/tomorrow.
> Parallel Scanners inside Region
> -------------------------------
>
> Key: HBASE-12031
> URL: https://issues.apache.org/jira/browse/HBASE-12031
> Project: HBase
> Issue Type: New Feature
> Components: Performance, Scanners
> Affects Versions: 0.98.6
> Reporter: Vladimir Rodionov
> Assignee: Vladimir Rodionov
> Fix For: 1.0.0, 2.0.0, 0.98.7, 0.99.1
>
> Attachments: HBASE-12031.patch
>
>
> This JIRA to improve performance of multiple scanners running on a same
> region in parallel. The scenarios where we will get the performance benefits:
> * New TableInputFormat with input splits smaller than HBase Region.
> * Scanning during compaction (Compaction scanner and application scanner over
> the same Region).
> Some JIRAs related to this one:
> https://issues.apache.org/jira/browse/HBASE-7336
> https://issues.apache.org/jira/browse/HBASE-5979
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