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Date: Tue, 7 Jul 2009 22:38:15 -0700 (PDT)
From: "stack (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Updated: (HBASE-1626) Allow emitting Deletes out of new
 TableReducer
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     [ https://issues.apache.org/jira/browse/HBASE-1626?page=3Dcom.atlassia=
n.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HBASE-1626:
-------------------------

    Attachment: deletes.patch

Do=C4=9Facan had interesting idea where hbase subclassed the new hadoop con=
text.

A lesser suggestion was to add a Marker interface to Delete and Put.

Playing around with it, a Marker interface would be a bit messy.  It'd have=
 to be in the client package and be public.  It'd have to be something like=
 Update or UpdateMarker (yuck).  But maybe this is the way to go?

Otherwise, make the hbase reducer generic so can pass anything -- e.g. a De=
lete or a Put -- and not specify types which might not be that bad.  Here's=
 why.

Looking at the TableOutputFormat, turns out the key is not used at all so n=
o need to specify a Type; i.e. ImmutableByteWritable.  And for the value, w=
e could leave it as Writable.  If not a Put or Delete, throw an IOE.  Means=
 we lose some of power of generics.

This is what the attached patch does.

Lars, any chance you'd take a look?  Do we even need a TableReducer if its =
all generic types?  I can see point of the TableMapper because value will b=
e Result (Here too, Key is redundant...).  Is it wrong to specialize the Ta=
bleOutputFormat?  Rather, leave it generic (though value must be a Delete o=
r a Put)?

> Allow emitting Deletes out of new TableReducer
> ----------------------------------------------
>
>                 Key: HBASE-1626
>                 URL: https://issues.apache.org/jira/browse/HBASE-1626
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: stack
>             Fix For: 0.20.0
>
>         Attachments: deletes.patch
>
>
> Do=C4=9Facan G=C3=BCney (nutch) wants to emit Delete from TableReduce.  C=
urrently we only do Put.

--=20
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