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https://issues.apache.org/jira/browse/HBASE-6805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13457764#comment-13457764
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Jason Dai commented on HBASE-6805:
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HBASE-6429 introduced a FilterWrap that wraps the filter operations at the
region server side, and we can use that to call related observers around the
filter operations. Specifically, we need to
# Add related observer functions (e.g., preFilterKeyValue) in
RegionCoprocessorHost
# In the prepareScanner method, wrap the filter (in the Scan) to FilterWrap
(so that the region server always calls the related methods in FilterWrap)
# In the related methods of FilterWrap (e.g., FilterWrap.filterKeyvalue), call
the observers (e.g., preFilterKeyValue and postFilterKeyValue) before and after
the actual method call to Filter.filterKeyValue()
I'll upload a patch for review shortly.
> Extend co-processor framework to provide observers for filter operations
> ------------------------------------------------------------------------
>
> Key: HBASE-6805
> URL: https://issues.apache.org/jira/browse/HBASE-6805
> Project: HBase
> Issue Type: Sub-task
> Components: coprocessors
> Affects Versions: 0.96.0
> Reporter: Jason Dai
>
> There are several filter operations (e.g., filterKeyValue, filterRow,
> transform, etc.) at the region server side that either exclude KVs from the
> returned results, or transform the returned KV. We need to provide observers
> (e.g., preFilterKeyValue and postFilterKeyValue) for these operations in the
> same way as the observers for other data access operations (e.g., preGet and
> postGet). This extension is needed to support DOT (e.g., extracting
> individual fields from the document in the observers before passing them to
> the related filter operations)
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