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https://issues.apache.org/jira/browse/HBASE-22448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16845489#comment-16845489
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Zheng Hu commented on HBASE-22448:
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I run the benchmark-UT in my branch-1.2 (rev-id: af250d2). OK, seems it's much
better than branch-1.4. cost about 2s.
{code}
2019-05-22 12:07:24,536 INFO [main] regionserver.TestScanBenchmark(98): Total
time consumed: 2030 (ms). count: 1
{code}
> Scan is slow for Multiple Column prefixes
> -----------------------------------------
>
> Key: HBASE-22448
> URL: https://issues.apache.org/jira/browse/HBASE-22448
> Project: HBase
> Issue Type: Bug
> Components: Scanners
> Affects Versions: 1.4.8, 1.4.9
> Reporter: Karthick
> Assignee: Zheng Hu
> Priority: Critical
> Labels: prefix, scan, scanner
> Fix For: 1.5.0, 1.4.10
>
> Attachments: 0001-benchmark-UT.patch, HBaseFileImport.java,
> qualifiers.txt, scanquery.txt
>
>
> While scanning a row (around 10 lakhs columns) with 100 column prefixes, it
> takes around 4 seconds in hbase-1.2.5 and when the same query is executed in
> hbase-1.4.9 it takes around 50 seconds.
> Is there any way to optimise this?
>
> *P.S:*
> We have applied the patch provided in
> [-HBASE-21620-|https://jira.apache.org/jira/browse/HBASE-21620] and
> [-HBASE-21734-|https://jira.apache.org/jira/browse/HBASE-21734] . Attached
> *qualifiers*.*txt* file which contains the column keys. Use the
> *HBaseFileImport.java* file provided to populate in your table and use
> *scanquery.txt* to query.
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