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From Ted Yu <yuzhih...@gmail.com>
Subject Re: HBase API for checking status
Date Mon, 26 Jul 2010 23:26:27 GMT
The following information can also be obtained from REST API on 0.20.5,
right ?

Thanks

On Fri, Jul 23, 2010 at 4:31 PM, Stack <stack@duboce.net> wrote:

> Read -ROOT- table to find that.  It'll usually have one row only with
> detail on the .META. region including info:server column which has
> meta server location.
> St.Ack
>
>
> On Fri, Jul 23, 2010 at 4:07 PM, Ted Yu <yuzhihong@gmail.com> wrote:
> > For item 1, I was also looking to find out the region server name which
> > hosts .META.
> >
> > Thanks
> >
> > On Fri, Jul 23, 2010 at 3:51 PM, Stack <stack@duboce.net> wrote:
> >
> >> On Fri, Jul 23, 2010 at 2:40 PM, Ted Yu <yuzhihong@gmail.com> wrote:
> >> > Hi,
> >> > I am looking for HBase API for getting the following information:
> >> > 1. is Meta table available - I found
> >> > RegionServerOperation.metaTableAvailable() but it is protected
> >>
> >> Thats not what you think it is Ted.
> >>
> >> To see if meta is available, do a Scan on it every so often.  You can
> >> open a Scanner -- via thrift if you are using perl, or write a bit of
> >> jruby and have it return a non-zero exit code on fail  -- on it as you
> >> would any other.  If the scan does not complete in some time then its
> >> not deployed.
> >>
> >>
> >> > 2. I found ProcessRegionStatusChange.metaRegionAvailable() which is
> also
> >> > protected
> >>
> >> Yeah, this is stuff internal to the servers; it won't get you what you
> >> want.
> >>
> >> > 3. cluster statistics: the total number of tables, the total space
> >> consumed
> >> > by all the tables
> >> >
> >>
> >> Total number of tables is something you'd have to do yourself I'd say.
> >>  Given the above meta scan, look at the row names and when their
> >> prefix changes -- their prefix is the table name the region belongs
> >> too, increment your table count.
> >>
> >> To see how much space is being used by hbase, thats ./bin/hadoop fs
> >> -dus /HBASE.ROOTDIR parsing whatever it returns.
> >>
> >> St.Ack
> >>
> >> > The goal is to call the above APIs from Perl library our Ops has
> >> developed
> >> > to facilitate cluster management.
> >> >
> >> > Thanks
> >> >
> >>
> >
>

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