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https://issues.apache.org/jira/browse/HBASE-6870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13628586#comment-13628586
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chunhui shen commented on HBASE-6870:
-------------------------------------
About the performance:
Total 256 regions in the table
Concurrent 170 thread
Each thread do AggregationClient#rowCount for one region
Before the patch:
Total 5s+
After the patch:
Total 200ms+
> HTable#coprocessorExec always scan the whole table
> ---------------------------------------------------
>
> Key: HBASE-6870
> URL: https://issues.apache.org/jira/browse/HBASE-6870
> Project: HBase
> Issue Type: Improvement
> Components: Coprocessors
> Affects Versions: 0.94.1, 0.95.0, 0.95.2
> Reporter: chunhui shen
> Assignee: chunhui shen
> Priority: Critical
> Fix For: 0.98.0, 0.95.1
>
> Attachments: 6870-v4.txt, HBASE-6870.patch,
> HBASE-6870-testPerformance.patch, HBASE-6870v2.patch, HBASE-6870v3.patch,
> hbase-6870v5.patch
>
>
> In current logic, HTable#coprocessorExec always scan the whole table, its
> efficiency is low and will affect the Regionserver carrying .META. under
> large coprocessorExec requests
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