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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);
return r;
public void testDataModification() throws Exception {
HBaseTestingUtility cluster = new HBaseTestingUtility();
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);
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