[jira] [Commented] (HBASE-16225) Refactor ScanQueryMatcher

["Andrew Purtell (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-16225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15375320#comment-15375320 ] 

Andrew Purtell commented on HBASE-16225:
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Go [~Apache9] ! (smile)

At a really really high level, can we imagine the internal process of scanning as a hierarchy of iterators? And filters. Iterators and filters. Compose them as needed to service the parameters of the ScanRequest. 


> Refactor ScanQueryMatcher
> -------------------------
>
>                 Key: HBASE-16225
>                 URL: https://issues.apache.org/jira/browse/HBASE-16225
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Duo Zhang
>
> As said in HBASE-16223, the code of {{ScanQueryMatcher}} is too complicated. I suggest that we can abstract an interface and implement several sub classes which separate different logic into different implementations. For example, the requirements of compaction and user scan are different, now we also need to consider the logic of user scan even if we only want to add a logic for compaction. And at least, the raw scan does not need a query matcher... we can implement a dummy query matcher for it.
> Suggestions are welcomed. Thanks.



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