Illustrate github question

CoprocessorTest.java

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.coprocessor.BaseRegionObserver;
import org.apache.hadoop.hbase.coprocessor.ObserverContext;
import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
import org.apache.hadoop.hbase.regionserver.HRegion;
import org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost;
import org.apache.hadoop.hbase.regionserver.wal.WALEdit;
import org.apache.hadoop.hbase.util.Bytes;


public class CoprocessorTest {
     HRegion initHRegion (byte [] tableName, String callingMethod, Configuration conf, byte [] ... families) throws IOException {

        HTableDescriptor htd = new HTableDescriptor(tableName);
        for(byte [] family : families) {
            htd.addFamily(new HColumnDescriptor(family));
        }
        HRegionInfo info = new HRegionInfo(htd.getName(), null, null, false);
        Path path = new Path(DIR + callingMethod);
        HRegion r = HRegion.createHRegion(info, path, conf, htd);
        RegionCoprocessorHost host = new RegionCoprocessorHost(r, null, conf);
        r.setCoprocessorHost(host);
        return r;
    }

    @Test
    public void testDataModification() throws Exception {
        HBaseTestingUtility cluster = new HBaseTestingUtility();
        cluster.startMiniCluster();

        byte[] ROW = Bytes.toBytes("testRow");
        byte[] TABLE = Bytes.toBytes(getClass().getName());
        byte[] A = Bytes.toBytes("A");
        byte[] STATS = Bytes.toBytes("stats");
        byte[] CONTENT = Bytes.toBytes("content");
        byte[][] FAMILIES = new byte[][] { A, STATS, CONTENT } ;

        Configuration conf = HBaseConfiguration.create();
        HRegion region = initHRegion(TABLE, getClass().getName(), conf, FAMILIES);

        RegionCoprocessorHost h = region.getCoprocessorHost();
        h.load(MyCoprocessor.class, Coprocessor.PRIORITY_HIGHEST, conf);

        Put put = new Put(ROW);
        put.add(A, A, A);
        put.add(CONTENT, Bytes.toBytes("raw"), Bytes.toBytes("ABC");
        int lockid = region.obtainRowLock(ROW);
        region.put(put, lockid);
        region.releaseRowLock(lockid);
    }
}