Karthick created HBASE-22448:
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Summary: 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: 1.4.9, 1.4.8
Reporter: Karthick
Attachments: 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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