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From stack <st...@duboce.net>
Subject Re: A region full of data is missing
Date Tue, 10 Nov 2009 20:52:19 GMT
On Tue, Nov 10, 2009 at 11:41 AM, Ken Weiner <ken@gumgum.com> wrote:

> Other than http://wiki.apache.org/hadoop/Hbase/HbaseArchitecture, is there
> any documentation on the lifecycle of a region or the meaning of the
> following terms with respect to regions:
>
>
No.  You'll have to wait for the book Ken (smile).




> open vs closed
>


Region needs to be 'open' to be online.  Regions are 'closed' when they are
offlined; e.g. table is disabled or regionserver is being shutdown.  Also
closed when split.



> online vs offline
>

Offline is region has "offline=true" when you list it in .META. table.  Its
closed.  Not deployed to any server.  Changing from online to offline,
involves a close of the region on the regionserver and an update of its
record in .META. adding the offline=true attribute.




> enabled vs disabled
>

enabled==online
disabled==offline


St.Ack



>
> If not, it would be great if someone could explain these concepts.  Thanks.
>
> On Tue, Nov 10, 2009 at 10:47 AM, Lars George <lars@worldlingo.com> wrote:
>
> > Hi Vaibhav,
> >
> > You can close a region from the HBase shell. When in the shell type
> "tools"
> > to get a list of options. One of them will be "close_region", see its
> help
> > text next to it.
> >
> > HTH,
> > Lars
> >
> >
>

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