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From: Jean-Marc Spaggiari <jean-marc@spaggiari.org>
Date: Mon, 25 Feb 2013 10:02:46 -0500
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Subject: Re: CatalogJanitor: REGIONINFO_QUALIFIER is empty
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Ok. Document a JIRA and take a look at hbck to add that.

JM

2013/2/25 Ted Yu <yuzhihong@gmail.com>

> I think hbck should be enhanced to deal with this situation.
>
> On Mon, Feb 25, 2013 at 6:56 AM, Jean-Marc Spaggiari <
> jean-marc@spaggiari.org> wrote:
>
> > Hi Dave,
> >
> > Thanks for the details.
> >
> > Is it something that we should think about adding into HBCK?
> >
> > Seems that it can detect them "Number of empty REGIONINFO_QUALIFIER rows
> in
> > .META.: 6" but it's not fixing them nor listing them.
> >
> > JM
> >
> > 2013/2/25 ramkrishna vasudevan <ramkrishna.s.vasudevan@gmail.com>
> >
> > > Thanks for the info Dave.  Others will be benefited too.
> > >
> > > Regards
> > > Ram
> > >
> > > On Mon, Feb 25, 2013 at 7:25 PM, Dave Latham <latham@davelink.net>
> > wrote:
> > >
> > > > We recently saw some of these warnings in a cluster we were setting
> up.
> > > > These warnings mean there are rows in the META table that are missing
> > one
> > > > of the expected columns.  In our case, we verified that these regions
> > > > didn't appear to exist in HDFS either and the table itself showed no
> > > holes
> > > > or problems in hbck or via our application.  After looking at the
> > > > timestamps of the other data in these rows in META we determined that
> > the
> > > > remaining columns in META had been written on an earlier incarnation
> > of a
> > > > table with the same name.  I.e. we created a table once, put data in
> > it,
> > > > deleted the table, created a new table of the same name, and
> apparently
> > > not
> > > > everything was correctly deleted from META.  I'm not sure how that
> > > > happened, but to clean it up we manually removed those rows from META
> > and
> > > > didn't observe any more WARNings or problems afterward.  There's
> > another
> > > > mailing list thread from some months back from someone with a similar
> > > issue
> > > > and resolution.  Good luck!
> > > >
> > > > Dave
> > > >
> > > >
> > > > On Sun, Feb 24, 2013 at 5:03 PM, Jean-Marc Spaggiari <
> > > > jean-marc@spaggiari.org> wrote:
> > > >
> > > > > Hi,
> > > > >
> > > > > I'm wondering, how much should we worrie about those warnings:
> > > > > WARN org.apache.hadoop.hbase.master.CatalogJanitor:
> > > REGIONINFO_QUALIFIER
> > > > is
> > > > > empty in keyvalues={
> > > > >
> > > > > I have 6 of them show each time the CatalgoJanitor is running (5
> > > > minutes).
> > > > >
> > > > > Doesn't seems to really be an issue, but then why is it a WARN?
> > > > >
> > > > > Thanks,
> > > > >
> > > > > JM
> > > > >
> > > >
> > >
> >
>

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