That should work. St.Ack
On Mon, Jul 26, 2010 at 4:26 PM, Ted Yu <[email protected]> wrote: > 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> wrote: >> > >> >> On Fri, Jul 23, 2010 at 2:40 PM, Ted Yu <[email protected]> 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 >> >> > >> >> >> > >> >
