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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6805) Extend co-processor framework to provide observers for filter operations
Date Tue, 02 Oct 2012 04:03:09 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13467461#comment-13467461
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Ted Yu commented on HBASE-6805:
-------------------------------

Surely a lot of hooks are being added ;-)
{code}
+  List<String> generateRandomWords(int numberOfWords, int maxLengthOfWords) {
{code}
The above method can be private, right ?
{code}
+   * @param result the previous preFilterRowKey, modify as necessary
{code}
Syntax for the above comment is off.
                
> 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
>         Attachments: extend_coprocessor.patch
>
>
> 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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