Examples of org.apache.hadoop.hbase.io.ImmutableBytesWritable

org.apache.hadoop.hbase.io.ImmutableBytesWritable
A byte sequence that is usable as a key or value. Based on {@link org.apache.hadoop.io.BytesWritable} only this class is NOT resizableand DOES NOT distinguish between the size of the seqeunce and the current capacity as {@link org.apache.hadoop.io.BytesWritable} does. Hence itscomparatively 'immutable'. When creating a new instance of this class, the underlying byte [] is not copied, just referenced. The backing buffer is accessed when we go to serialize.

      HRegion region = getRegion(regionName);
      HbaseMapWritable result = new HbaseMapWritable();
      Map<Text, byte[]> map = region.getFull(row, ts);
      for (Map.Entry<Text, byte []> es: map.entrySet()) {
        result.put(new HStoreKey(row, es.getKey()),
            new ImmutableBytesWritable(es.getValue()));
      }
      return result;
      
    } catch (IOException e) {
      checkFileSystem();

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      if (map == null) {
        return null;
      }
      for (Map.Entry<Text, byte []> es: map.entrySet()) {
        result.put(new HStoreKey(row, es.getKey()),
            new ImmutableBytesWritable(es.getValue()));
      }
      return result;
      
    } catch (IOException e) {
      checkFileSystem();

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      HStoreKey key = new HStoreKey();
      TreeMap<Text, byte []> results = new TreeMap<Text, byte []>();
      while (s.next(key, results)) {
        for(Map.Entry<Text, byte []> e: results.entrySet()) {
          values.put(new HStoreKey(key.getRow(), e.getKey(), key.getTimestamp()),
            new ImmutableBytesWritable(e.getValue()));
        }


        if(values.size() > 0) {
          // Row has something in it. Return the value.
          break;

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      // Test 1.  Pass a KV that has a ts of LATEST_TIMESTAMP.  It should be
      // changed by call to write.  Check all in kv is same but ts.
      KeyValue kv = new KeyValue(b, b, b);
      KeyValue original = kv.clone();
      writer.write(new ImmutableBytesWritable(), kv);
      assertFalse(original.equals(kv));
      assertTrue(Bytes.equals(original.getRow(), kv.getRow()));
      assertTrue(original.matchingColumn(kv.getFamily(), kv.getQualifier()));
      assertNotSame(original.getTimestamp(), kv.getTimestamp());
      assertNotSame(HConstants.LATEST_TIMESTAMP, kv.getTimestamp());


      // Test 2. Now test passing a kv that has explicit ts.  It should not be
      // changed by call to record write.
      kv = new KeyValue(b, b, b, kv.getTimestamp() - 1, b);
      original = kv.clone();
      writer.write(new ImmutableBytesWritable(), kv);
      assertTrue(original.equals(kv));
    } finally {
      if (writer != null && context != null) writer.close(context);
      dir.getFileSystem(conf).delete(dir, true);
    }

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      final byte [] b = Bytes.toBytes("b");


      // value 1 with timestamp 2000
      KeyValue kv = new KeyValue(b, b, b, 2000, b);
      KeyValue original = kv.clone();
      writer.write(new ImmutableBytesWritable(), kv);
      assertEquals(original,kv);


      // value 2 with timestamp 1000
      kv = new KeyValue(b, b, b, 1000, b);
      original = kv.clone();
      writer.write(new ImmutableBytesWritable(), kv);
      assertEquals(original, kv);


      // verify that the file has the proper FileInfo.
      writer.close(context);

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    Random random = new Random();
    for (int i = 0; i < numRows; i++) {


      Bytes.putInt(keyBytes, 0, i);
      random.nextBytes(valBytes);
      ImmutableBytesWritable key = new ImmutableBytesWritable(keyBytes);


      for (byte[] family : families) {
        KeyValue kv = new KeyValue(keyBytes, family,
            PerformanceEvaluation.QUALIFIER_NAME, valBytes);
        writer.write(key, kv);

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        random.nextBytes(keyBytes);
        // Ensure that unique tasks generate unique keys
        keyBytes[keyLength - 1] = (byte)(taskId & 0xFF);
        random.nextBytes(valBytes);
        ImmutableBytesWritable key = new ImmutableBytesWritable(keyBytes);


        for (byte[] family : TestHFileOutputFormat.FAMILIES) {
          KeyValue kv = new KeyValue(keyBytes, family,
              PerformanceEvaluation.QUALIFIER_NAME, valBytes);
          context.write(key, kv);

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        }
        out.close();
      } catch (IOException e) {
        throw new RuntimeException("IOException in Result.getBytes()", e);
      }
      this.bytes = new ImmutableBytesWritable(out.getData(), 0, out.getLength());
    }
    return this.bytes;
  }

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      bytes = null;
      return;
    }
    byte [] raw = new byte[totalBuffer];
    readChunked(in, raw, 0, totalBuffer);
    bytes = new ImmutableBytesWritable(raw, 0, totalBuffer);
  }

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        offset += Bytes.SIZEOF_INT;
        in.readFully(buf, offset, keyLen);
        offset += keyLen;
      }
      int totalLength = offset - initialOffset;
      results[i] = new Result(new ImmutableBytesWritable(buf, initialOffset,
          totalLength));
    }
    return results;
  }

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