Jerry Lam created HBASE-6757:
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Summary: 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
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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