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Olson,Andrew commented on HBASE-5257:
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Andrew Olson | Sr. Software Architect | Cerner Corporation | 816.201.3825 |
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Allow INCLUDE_AND_NEXT_COL in filters and use it in ColumnPaginationFilter
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Key: HBASE-5257
URL: https://issues.apache.org/jira/browse/HBASE-5257
Project: HBase
Issue Type: Improvement
Components: Filters, Performance
Reporter: Lars Hofhansl
Assignee: Varun Sharma
Fix For: 0.94.3, 0.95.0
Attachments: 5257-0.92.addendum, 5257-trunk.txt, 5257-trunk-v2.txt,
HBASE-5257-0.92.txt, HBASE-5257-0.94.txt
There are various usecases and filter types where evaluating the filter
before version are handled either do not make sense, or make filter handling
more complicated.
Also see this comment in ScanQueryMatcher:
{code}
/**
* Filters should be checked before checking column trackers. If we do
* otherwise, as was previously being done, ColumnTracker may increment
its
* counter for even that KV which may be discarded later on by Filter.
This
* would lead to incorrect results in certain cases.
*/
{code}
So we had Filters after the column trackers (which do the version checking),
and then moved it.
Should be at the discretion of the Filter.
Could either add a new method to FilterBase (maybe excludeVersions() or
something). Or have a new Filter wrapper (like WhileMatchFilter), that should
only be used as outmost filter and indicates the same (maybe
ExcludeVersionsFilter).
See latest comments on HBASE-5229 for motivation.
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