Examples of org.hbase.async.DeleteRequest

org.hbase.async.DeleteRequest
Deletes some data into HBase.
A note on passing {@code byte} arrays in argument
None of the method that receive a {@code byte[]} in argument will copy it.For more info, please refer to the documentation of {@link HBaseRpc}.
A note on passing {@code String}s in argument
All strings are assumed to use the platform's default charset.
A note on passing {@code timestamp}s in argument
Irrespective of the order in which you send RPCs, a {@code DeleteRequest}that is created with a specific timestamp in argument will only delete values in HBase that were previously stored with a timestamp less than or equal to that of the {@code DeleteRequest} unless{@link #setDeleteAtTimestampOnly} is also called, in which case only thevalue at the specified timestamp is deleted.

    final GetRequest get = new GetRequest(table, "k", family, "q");
    client.put(put).join();
    final ArrayList<KeyValue> kvs = client.get(get).join();
    assertSizeIs(1, kvs);
    assertEq("val", kvs.get(0).value());
    final DeleteRequest del = new DeleteRequest(table, "k", family, "q");
    client.delete(del).join();
    final ArrayList<KeyValue> kvs2 = client.get(get).join();
    assertSizeIs(0, kvs2);
  }

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    final GetRequest get = new GetRequest(t, k, f, q).maxVersions(2);
    final ArrayList<KeyValue> kvs = client.get(get).join();
    assertSizeIs(2, kvs);
    assertEq("val2", kvs.get(0).value());
    assertEq("val1", kvs.get(1).value());
    final DeleteRequest del = new DeleteRequest(t, k, f, q, 200L);
    del.setDeleteAtTimestampOnly(true);
    client.delete(del).join();
    final ArrayList<KeyValue> kvs2 = client.get(get).join();
    assertSizeIs(1, kvs2);
    assertEq("val1", kvs2.get(0).value());
  }

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    client.put(put2).join();
    final PutRequest put3 = new PutRequest(table, "mdk2", family, "q3", "val3");
    client.put(put3).join();
    final PutRequest put1 = new PutRequest(table, "mdk1", family, "q1", "val1");
    client.put(put1).join();
    final DeleteRequest del2 = new DeleteRequest(table, "mdk1", family, "q2");
    final DeleteRequest del3 = new DeleteRequest(table, "mdk2", family, "q3");
    final DeleteRequest del1 = new DeleteRequest(table, "mdk1", family, "q1");
    Deferred.group(client.delete(del2), client.delete(del3),
                   client.delete(del1)).join();
    GetRequest get = new GetRequest(table, "mdk1");
    ArrayList<KeyValue> kvs = client.get(get).join();
    assertSizeIs(0, kvs);

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    client.put(put2).join();
    final PutRequest put3 = new PutRequest(table1, "mdk2", family, "q3", "val3");
    client.put(put3).join();
    final PutRequest put1 = new PutRequest(table2, "mdk1", family, "q1", "val1");
    client.put(put1).join();
    final DeleteRequest del2 = new DeleteRequest(table1, "mdk1", family, "q2");
    final DeleteRequest del3 = new DeleteRequest(table1, "mdk2", family, "q3");
    final DeleteRequest del1 = new DeleteRequest(table2, "mdk1", family, "q1");
    Deferred.group(client.delete(del2), client.delete(del3),
                   client.delete(del1)).join();
    GetRequest get = new GetRequest(table1, "mdk1");
    ArrayList<KeyValue> kvs = client.get(get).join();
    assertSizeIs(0, kvs);

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    final byte[] table = TestIntegration.table.getBytes();
    final byte[] key1 = "cnt1".getBytes();  // Spread the increments..
    final byte[] key2 = "cnt2".getBytes();  // .. over these two counters.
    final byte[] family = TestIntegration.family.getBytes();
    final byte[] qual = { 'q' };
    final DeleteRequest del1 = new DeleteRequest(table, key1, family, qual);
    final DeleteRequest del2 = new DeleteRequest(table, key2, family, qual);
    Deferred.group(client.delete(del1), client.delete(del2)).join();


    final int nthreads = Runtime.getRuntime().availableProcessors() * 2;
    // The magic number comes from the limit on callbacks that Deferred
    // imposes.  We spread increments over two counters, hence the x 2.

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    client.setFlushInterval(SLOW_FLUSH);
    final byte[] table = TestIntegration.table.getBytes();
    final byte[] key = "cnt".getBytes();
    final byte[] family = TestIntegration.family.getBytes();
    final byte[] qual = { 'q' };
    final DeleteRequest del = new DeleteRequest(table, key, family, qual);
    del.setBufferable(false);
    client.delete(del).join();
    final long big = 1L << 48;  // Too big to be coalesced.
    final ArrayList<KeyValue> kvs = Deferred.group(
      bufferIncrement(table, key, family, qual, big),
      bufferIncrement(table, key, family, qual, big)

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    client.setFlushInterval(SLOW_FLUSH);
    final byte[] table = TestIntegration.table.getBytes();
    final byte[] key = "cnt".getBytes();
    final byte[] family = TestIntegration.family.getBytes();
    final byte[] qual = { 'q' };
    final DeleteRequest del = new DeleteRequest(table, key, family, qual);
    del.setBufferable(false);
    client.delete(del).join();
    final long big = 1L << 47;
    // First two RPCs can be coalesced.
    bufferIncrement(table, key, family, qual, big);
    bufferIncrement(table, key, family, qual, 1);

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    client.setFlushInterval(SLOW_FLUSH);
    final byte[] table = TestIntegration.table.getBytes();
    final byte[] key = "cnt".getBytes();
    final byte[] family = TestIntegration.family.getBytes();
    final byte[] qual = { 'q' };
    final DeleteRequest del = new DeleteRequest(table, key, family, qual);
    del.setBufferable(false);
    client.delete(del).join();
    final long big = -1L << 47;
    // First two RPCs can be coalesced.
    bufferIncrement(table, key, family, qual, big);
    bufferIncrement(table, key, family, qual, -1);

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    client.setFlushInterval(SLOW_FLUSH);
    final byte[] table = TestIntegration.table.getBytes();
    final byte[] key = "cnt".getBytes();
    final byte[] family = TestIntegration.family.getBytes();
    final byte[] qual = { 'q' };
    final DeleteRequest del = new DeleteRequest(table, key, family, qual);
    del.setBufferable(false);
    client.delete(del).join();
    // HBase 0.98 and up do not create a KV on atomic increment when the
    // increment amount is 0.  So let's first send an increment of some
    // arbitrary value, and then ensure that this value hasn't changed.
    long n = client.atomicIncrement(new AtomicIncrementRequest(table, key,

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      if (i % 2 == 0) {
        put = new PutRequest(table1, key, family, "q", "v");
      } else {
        put = new PutRequest(table2, key, family, "q", "v");
      }
      final DeleteRequest delete = new DeleteRequest(put.table(), put.key());
      client.delete(delete);
      client.put(put);
    }
    client.flush().joinUninterruptibly();
  }

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Examples of org.hbase.async.DeleteRequest

A note on passing {@code byte} arrays in argument

A note on passing {@code String}s in argument

A note on passing {@code timestamp}s in argument

Related Classes of org.hbase.async.DeleteRequest