문제 설명
HBase 클러스터에서 regionservers의 시작 코드를 얻는 방법은 무엇입니까? (How to get regionservers' startcode in a HBase cluster?)
어떻게 하면 될까요? 자세히 :)</p>
참조 솔루션
방법 1:
okay, finally i worked it out.
/*
* Copyright: Copyright (c) 2012 Kaliumn
*
* @Description: get regionservers' startcode in a hbase cluster
*
*/
package test.hbase;
import java.util.Collection;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HServerInfo;
import org.apache.hadoop.hbase.MasterNotRunningException;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.ZooKeeperConnectionException;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.ipc.HMasterInterface;
import org.gfg.kalium.server.hbaseutil.HConfUtils;
/**
* class <code> GetStartcode </code> is used to get regionservers' startcode
*
* @author <a href="mailto:ml.huang@kaliumn.com">Meilong Huang</a>
* @version v1.0.0
* @date 2012‑6‑26 05:24:10
*
*/
public class GetStartcode {
/**
* get regionservers' startcode
*
* @param args
* @throws ZooKeeperConnectionException
* @throws MasterNotRunningException
*/
public static void main(String[] args) throws MasterNotRunningException,
ZooKeeperConnectionException {
Configuration conf = HConfUtils
.setHbaseConf("k2.ccntgrid.org,k3.ccntgrid.org,k4.ccntgrid.org");
HBaseAdmin admin = new HBaseAdmin(conf);
HMasterInterface master = admin.getMaster();
Collection<ServerName> rs = master.getClusterStatus().getServerInfo();
for (ServerName r : rs) {
System.out.println(r.getHostname());
System.out.println(r.getServerName());
System.out.println(r.getStartcode());
System.out.println("+++++++++++++++++");
}
}
}
actually, startcode is the last part of the 'servername'.
these commands will finish moving regions from one regionserver to other:
> ka@k1 bin % pwd
> /opt/kalium/hbase/bin
> ka@k1 bin % echo "move '3504a80cd4047f78834bcf58bf169e62', 'k4.ccntgrid.org,60020,1340682441023'" | ./hbase shell
> HBase Shell; enter 'help<RETURN>' for list of supported commands.
Type "exit<RETURN>" to leave the HBase Shell
Version 0.92.1, r1298924, Fri Mar 9 16:58:34 UTC 2012
> move '3504a80cd4047f78834bcf58bf169e62', 'k4.ccntgrid.org,60020,1340682441023'
0 row(s) in 0.5380 seconds
u need the the region code to finish this. the region code is the last part of the region name(behind a dot(.)). 
방법 2:
You can use the command status in the hbase shell:
hbase(main):001:0> status 'simple'
It will print the list of region servers with their server names, ports and startcodes.