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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12979) Use setters instead of return values for handing back statistics from HRegion methods
Date Fri, 06 Feb 2015 21:15:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14309933#comment-14309933
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Andrew Purtell commented on HBASE-12979:
----------------------------------------

I've thought about returning stats on query results but that should be a separate issue. This
one seems good to go.

> Use setters instead of return values for handing back statistics from HRegion methods
> -------------------------------------------------------------------------------------
>
>                 Key: HBASE-12979
>                 URL: https://issues.apache.org/jira/browse/HBASE-12979
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.98.10
>            Reporter: Andrew Purtell
>            Assignee: Jesse Yates
>              Labels: phoenix
>             Fix For: 0.98.10.1
>
>         Attachments: hbase-12979-v0-master.patch
>
>
> In HBASE-5162 (and backports such as HBASE-12729) we modified some HRegion methods to
return statistics for consumption by callers. The statistics are ultimately passed back to
the client as load feedback.
> [~lhofhansl] thinks handing back this information as return values from HRegion methods
is a weird mix of concerns. This also produced a difficult to anticipate binary compatibility
issue with Phoenix. There was no compile time issue because the code of course was not structured
to assign from a method returning void, yet the method signature changes so the JVM cannot
resolve it if older Phoenix binaries are installed into a 0.98.10 release. Let's change the
HRegion methods back to returning 'void' and use setters instead. Officially we don't support
use of HRegion (HBASE-12566) but we do not need to go out of our way to break things (smile)
so I would also like to make a patch release containing just this change to help out our sister
project.



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