Re: HConnection.locateRegions returns null

[Lyska Anton]

Hi,

thanks a lot!
as Nicolas wrote, I use

        List<HRegionInfo> regions = MetaScanner.listAllRegions(config);
        for (HRegionInfo info : regions) {
            HRegionLocation loc = connection.locateRegion(info.getTableName(), 
info.getStartKey());
            ....
        }

03.01.2013 2:34, Jean-Marc Spaggiari пишет:

Here is the code for locateRegion:

     @Override
     public List<HRegionLocation> locateRegions(final byte [] tableName)
     throws IOException {
       // TODO implement.  use old stuff or new stuff?
       return null;
     }


As you can see, it's like what Nicolas is saying. Always return null.

However, relocateRegion is calling a private locateRegions which is
not returning null.... You might want to try that?

Also, I played few weeks ago with the  region balancing. You can take
a look here to see what I did.
http://www.spaggiari.org/index.php/hbase/changing-the-hbase-default-loadbalancer
You can do yours based on that.

Nicolas, should we not have locateRegion "simply" calling the private
locateRegion method?

JM

2013/1/2, Nicolas Liochon <nkey...@gmail.com>:

Hi,

It's actually not implemented (I will update the javadoc for the latest
version)
You can use locateRegion(final byte [] tableName, final byte [] row), and
iterates on all region start keys to get all the regions.

Cheers,

Nicolas




On Wed, Jan 2, 2013 at 5:17 PM, Lyska Anton <ant...@wildec.com> wrote:

Hi all,

I want to write simple tool for rebalancing regions in cluster.
For that I need current location of all regions.
I've found method HConnection.locateRegions(**tableName), but it always
returns null.
Also, i've tried to call HConnection.locateRegion(**regionName), and it
returns null too.

sample code:

         Configuration config = HBaseConfiguration.create();
         config.set("hbase.zookeeper.**quorum", host);

         HConnection connection = HConnectionManager.**
createConnection(config);
         List<HRegionLocation> locations =
connection.locateRegions(**tableName);
  //return null here

HBase Version    0.92.1-cdh4.1.2

Thanks in advance.