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https://issues.apache.org/jira/browse/HBASE-6757?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lars Hofhansl updated HBASE-6757:
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Attachment: 6757.txt
Super simple fix.
There might be more to it (like the consideration to give each filter a chance
to look at each KV), but I think this patch should be OK.
> Very inefficient behaviour of scan using FilterList
> ---------------------------------------------------
>
> Key: HBASE-6757
> URL: https://issues.apache.org/jira/browse/HBASE-6757
> Project: HBase
> Issue Type: Improvement
> Components: filters
> Affects Versions: 0.90.6
> Reporter: Jerry Lam
> Attachments: 6757.txt, CopyOfTestColumnPrefixFilter.java,
> DisplayFilter.java
>
>
> The behaviour of scan is very inefficient when using with FilterList.
> The FilterList rewrites the return code from NEXT_ROW to SKIP from a filter
> if Operator.MUST_PASS_ALL is used.
> This happens when using ColumnPrefixFilter. Even though the
> ColumnPrefixFilter indicates to jump to NEXT_ROW because no further match can
> be found, the scan continues to scan all versions of a column in that row and
> all columns of that row because the ReturnCode from ColumnPrefixFilter has
> been rewritten by the FilterList from NEXT_ROW to SKIP.
> This is particularly inefficient when there are many versions in a column
> because the check is performed on all versions of the column instead of just
> by checking the qualifier of the column name.
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