Examples of org.apache.hadoop.hbase.client.Append

org.apache.hadoop.hbase.client.Append
Performs Append operations on a single row.
Note that this operation does not appear atomic to readers. Appends are done under a single row lock, so write operations to a row are synchronized, but readers do not take row locks so get and scan operations can see this operation partially completed.
To append to a set of columns of a row, instantiate an Append object with the row to append to. At least one column to append must be specified using the {@link #add(byte[],byte[],byte[])} method.

    }
    requestCount.incrementAndGet();
    try {
      HRegion region = getRegion(regionName);
      Integer lock = getLockFromId(append.getLockId());
      Append appVal = append;
      Result resVal;
      if (region.getCoprocessorHost() != null) {
        resVal = region.getCoprocessorHost().preAppend(appVal);
        if (resVal != null) {
          return resVal;

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      public Object run() throws Exception {
        byte[] row = Bytes.toBytes("random_row");
        byte[] qualifier = Bytes.toBytes("q");
        Put put = new Put(row);
        put.add(TEST_FAMILY, qualifier, Bytes.toBytes(1));
        Append append = new Append(row);
        append.add(TEST_FAMILY, qualifier, Bytes.toBytes(2));
        HTable t = new HTable(conf, TEST_TABLE);
        try {
          t.put(put);
          t.append(append);
        } finally {

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  public void testAppend() throws IOException {
    initHRegion(tableName, name.getMethodName(), fam1);
    String v1 = "Ultimate Answer to the Ultimate Question of Life,"+
    " The Universe, and Everything";
    String v2 = " is... 42.";
    Append a = new Append(row);
    a.setReturnResults(false);
    a.add(fam1, qual1, Bytes.toBytes(v1));
    a.add(fam1, qual2, Bytes.toBytes(v2));
    assertNull(region.append(a));
    a = new Append(row);
    a.add(fam1, qual1, Bytes.toBytes(v2));
    a.add(fam1, qual2, Bytes.toBytes(v1));
    Result result = region.append(a);
    assertEquals(0, Bytes.compareTo(Bytes.toBytes(v1+v2), result.getValue(fam1, qual1)));
    assertEquals(0, Bytes.compareTo(Bytes.toBytes(v2+v1), result.getValue(fam1, qual2)));
  }

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      all[i] = new AtomicOperation(region, opsPerThread, null, failures) {
        @Override
        public void run() {
          for (int i=0; i<numOps; i++) {
            try {
              Append a = new Append(row);
              a.add(fam1, qual1, val);
              a.add(fam1, qual2, val);
              a.add(fam2, qual3, val);
              region.append(a);


              Get g = new Get(row);
              Result result = region.get(g);
              assertEquals(result.getValue(fam1, qual1).length, result.getValue(fam1, qual2).length);

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  @Test
  public void testAppendWithReadOnlyTable() throws Exception {
    byte[] TABLE = Bytes.toBytes("readOnlyTable");
    this.region = initHRegion(TABLE, getName(), conf, true, Bytes.toBytes("somefamily"));
    boolean exceptionCaught = false;
    Append append = new Append(Bytes.toBytes("somerow"));
    append.setDurability(Durability.SKIP_WAL);
    append.add(Bytes.toBytes("somefamily"), Bytes.toBytes("somequalifier"),
        Bytes.toBytes("somevalue"));
    try {
      region.append(append);
    } catch (IOException e) {
      exceptionCaught = true;

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    @Override
    public void updateSet(short shard,String partion, long higo_uuid,
        MdrillInputDocument update, MdrillInputDocument inc, MdrillInputDocument del) throws IOException {
      if(update!=null)
      {
        Append append=new Append(Bytes.toBytes(higo_uuid));


        for(Entry<String, Object> e:update.getMap().entrySet())
        {
          append.add(MdrillRealTimeHbaseImpl.DATA_FAMILY, Bytes.toBytes(e.getKey()),toBytes(e.getValue()));
        }
        table.append(append);
      }
      
      if(del!=null)

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    }
    requestCount.incrementAndGet();
    try {
      HRegion region = getRegion(regionName);
      Integer lock = getLockFromId(append.getLockId());
      Append appVal = append;
      Result resVal;
      if (region.getCoprocessorHost() != null) {
        resVal = region.getCoprocessorHost().preAppend(appVal);
        if (resVal != null) {
          return resVal;

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    @Override
    public void run() {
      int count = 0;
      while (count < appendCounter) {
        Append app = new Append(appendRow);
        app.add(family, qualifier, CHAR);
        count++;
        try {
          region.append(app, null, true);
        } catch (IOException e) {
          e.printStackTrace();

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      Get g = new Get(rk.getBytes());
      g.addColumn(cf.getBytes(), appendCol.getBytes());
      hTable.get(g);
  
      Append a = new Append(rk.getBytes());
      a.add(cf.getBytes(), appendCol.getBytes(), Bytes.toBytes("-APPEND"));
      hTable.append(a);
  
      Delete dOne = new Delete(rk.getBytes());
      dOne.deleteFamily(cf.getBytes());
      hTable.delete(dOne);

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  public void testAppendWithReadOnlyTable() throws Exception {
    byte[] TABLE = Bytes.toBytes("readOnlyTable");
    this.region = initHRegion(TABLE, getName(), conf, true, Bytes.toBytes("somefamily"));
    boolean exceptionCaught = false;
    Append append = new Append(Bytes.toBytes("somerow"));
    append.add(Bytes.toBytes("somefamily"), Bytes.toBytes("somequalifier"), 
        Bytes.toBytes("somevalue"));
    try {
      region.append(append, false);
    } catch (IOException e) {
      exceptionCaught = true;

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