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https://issues.apache.org/jira/browse/HBASE-6618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alex Baranau updated HBASE-6618:
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Attachment: HBASE-6618-algo-desc-bits.png
HBASE-6618-algo.patch
Anil,
Now that I thought about it I just realized that finding the row key to
fast-forward to, when given any number of "range groups" in the fuzzy rules is
quite easy. And also can be done in just *one pass*, by going through the bytes
of the given row.
Didn't have much time to add this functionality to the filter itself, but
implemented the algorithm that seems to find the row key to fast-forward to (if
you are interested to look at it). Added static method for that with small (not
full) unit-test. Also attached brief description of the algo. I hope I'm not
missing anything.
Will implement the new feature of the filter as a next step.
> Implement FuzzyRowFilter with ranges support
> --------------------------------------------
>
> Key: HBASE-6618
> URL: https://issues.apache.org/jira/browse/HBASE-6618
> Project: HBase
> Issue Type: New Feature
> Components: filters
> Reporter: Alex Baranau
> Priority: Minor
> Attachments: HBASE-6618-algo-desc-bits.png, HBASE-6618-algo.patch
>
>
> Apart from current ability to specify fuzzy row filter e.g. for
> <userId_actionId> format as ????_0004 (where 0004 - actionId) it would be
> great to also have ability to specify the "fuzzy range" , e.g. ????_0004,
> ..., ????_0099.
> See initial discussion here: http://search-hadoop.com/m/WVLJdX0Z65
> Note: currently it is possible to provide multiple fuzzy row rules to
> existing FuzzyRowFilter, but in case when the range is big (contains
> thousands of values) it is not efficient.
> Filter should perform efficient fast-forwarding during the scan (this is what
> distinguishes it from regex row filter).
> While such functionality may seem like a proper fit for custom filter (i.e.
> not including into standard filter set) it looks like the filter may be very
> re-useable. We may judge based on the implementation that will hopefully be
> added.
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