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From Jasmin Guliani <er.j...@gmail.com>
Subject hbase Observer POST PUT coprocesor not working
Date Mon, 06 Oct 2014 17:41:08 GMT
I have written coprocessor code with below code. After compiling this code,
I have created the jar file. And then added this jar as a coprocessor to
the table.

alter 'SOURCE_TBL' , METHOD => 'table_att' , 'COPROCESSOR'=>
'hdfs:///apps/stsuid/HBASESamples-0.0.1-SNAPSHOT.jar|com.hbase.coprocessor.PutRegionObserverExample|1001'

After this, when I am doing put operation on source table 'SOURCE_TBL'
mentioned as below, I am expecting a record in index table 'INDEX_TBL' but
there are no records in INDEX_TBL.

put 'SOURCE_TBL' , '123' , 'data:CUST_ID' , 'RFRT'


Please help me and let me know if my code of coprocessor is wrong or am I
executing it in a wrong way.



package com.hbase.coprocessor;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.logging.Logger;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CoprocessorEnvironment;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.HTableInterface;
import org.apache.hadoop.hbase.client.HTablePool;
import org.apache.hadoop.hbase.client.Put;
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.wal.WALEdit;
import org.apache.hadoop.hbase.util.Bytes;

public class PutRegionObserverExample extends BaseRegionObserver {

 public static final byte[] FIXED_ROW = Bytes.toBytes("@@@GETTIME@@@");
 private final static Logger LOG =
Logger.getLogger(PutRegionObserverExample.class.getName());


 private HTablePool pool = null;

    private final static String  INDEX_TABLE  = "INDEX_TBL";
    private final static String  SOURCE_TABLE = "SOURCE_TBL";

    public void start(CoprocessorEnvironment env) throws IOException {

        LOG.info("(start)");
        pool = new HTablePool(env.getConfiguration(), 10);
     }

    //@Override
    public void postPut(
        final ObserverContext<RegionCoprocessorEnvironment> observerContext,
        final Put put,
        final WALEdit edit,
        final boolean writeToWAL)
        throws IOException {

        byte[] table =
observerContext.getEnvironment().getRegion().getRegionInfo().getTableName();

        if (!Bytes.equals(table, Bytes.toBytes(SOURCE_TABLE))) {
         LOG.info("SOURCE_TABLE");
         return;
        }

        try {

         final List<Cell> filteredList = put.get(Bytes.toBytes
("data"),Bytes.toBytes("CUST_ID"));
            byte [] id = put.getRow(); //Get the Entry ID

            Cell kv=filteredList.get( 0 ); //get Entry PARENT_ID
            byte[] parentId = kv.getValue();


           HTableInterface htbl = pool.getTable(Bytes.toBytes(INDEX_TABLE));

           //create row key for the index table
           byte[] p1 = concatTwoByteArrays(parentId, ":".getBytes());
//Insert a semicolon between two UUIDs
           byte[] rowkey = concatTwoByteArrays(p1, id);

           Put indexput  = new Put(rowkey);

           indexput.add(Bytes.toBytes("data"), Bytes.toBytes("CUST_ID"),
Bytes.toBytes("tgt9"));
           htbl.put(indexput);

           htbl.close();

        } catch ( IllegalArgumentException ex) {
            // handle excepion.
         LOG.info(ex.getMessage());
        }

    }


    @Override
    public void stop(CoprocessorEnvironment env) throws IOException {
        pool.close();
    }


    public static final byte[] concatTwoByteArrays(byte[] first, byte[]
second) {
        byte[] result = Arrays.copyOf(first, first.length + second.length);
        System.arraycopy(second, 0, result, first.length, second.length);
        return result;
    }

}

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