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From "Chia-Ping Tsai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18945) Make a Public interface for CellComparator
Date Mon, 09 Oct 2017 18:14:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16197425#comment-16197425
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Chia-Ping Tsai commented on HBASE-18945:
----------------------------------------

bq. existing CellComparator remain and will introduce HCellComparator as the interface? But
this is orthogonal to Store/HStore where Store is exposed to CP and HStore is internal. 
That is really weird...If avoiding the large patch is primary condition, the {{CoprocessorCellComparator}}
is acceptable name. The CoprocessorRegionServerServices is already in our hbase.

> Make a Public interface for CellComparator
> ------------------------------------------
>
>                 Key: HBASE-18945
>                 URL: https://issues.apache.org/jira/browse/HBASE-18945
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 2.0.0-beta-1
>
>         Attachments: HBASE-18495.patch
>
>
> Based on discussions over in HBASE-18826 and HBASE-18183 it is better we expose CellComparator
as a public interface so that it could be used in Region/Store interfaces to be exposed to
CPs.
> Currently the Comparator is exposed in Region, STore and StoreFile. There is another
discussion whether to expose it at all layers or only at Region. However since we are exposing
this to CPs CellComparator being @Private is not the ideal way to do it. We have to change
it to LimitedPrivate. But CellComparator has lot of additional methods which are internal
(like where a Cell is compared with an incoming byte[] used in index comparsions etc).
> One way to expose is that as being done now in HBASE-18826 - by exposing the return type
as Comparator<Cell>. But this is not powerful. It only allows to compare cells. So we
try to expose an IA.LimitedPrivate interface that is more powerful and allows comparing individual
cell components also. 



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