Examples of org.apache.hadoop.hbase.Cell

org.apache.hadoop.hbase.Cell
The unit of storage in HBase consisting of the following fields:
```
 1) row 2) column family 3) column qualifier 4) timestamp 5) type 6) MVCC version 7) value 
```
Uniqueness is determined by the combination of row, column family, column qualifier, timestamp, and type.
The natural comparator will perform a bitwise comparison on row, column family, and column qualifier. Less intuitively, it will then treat the greater timestamp as the lesser value with the goal of sorting newer cells first.
This interface does not include methods that allocate new byte[]'s such as those used in client or debugging code. These should be placed in a sub-interface or the {@link CellUtil} class.
Cell implements Comparable which is only meaningful when comparing to other keys in the same table. It uses CellComparator which does not work on the -ROOT- and .META. tables.
In the future, we may consider adding a boolean isOnHeap() method and a getValueBuffer() method that can be used to pass a value directly from an off-heap ByteBuffer to the network without copying into an on-heap byte[].
Historic note: the original Cell implementation (KeyValue) requires that all fields be encoded as consecutive bytes in the same byte[], whereas this interface allows fields to reside in separate byte[]'s.

    Get get = new Get(row);
    get.addColumn(familiy, qualifier);
    Result result = region.get(get);
    assertEquals(1, result.size());


    Cell kv = result.rawCells()[0];
    long r = Bytes.toLong(CellUtil.cloneValue(kv));
    assertEquals(amount, r);
  }

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    for (Cell kv : result.rawCells()) {
      if (i >= expKvList.size()) {
        break;  // we will check the size later
      }


      Cell kvExp = expKvList.get(i++);
      if (toLog) {
        LOG.info("get kv is: " + kv.toString());
        LOG.info("exp kv is: " + kvExp.toString());
      }
      assertTrue("Not equal", kvExp.equals(kv));
    }


    assertEquals(expKvList.size(), result.size());
  }

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    region.compactStores(true);


    scanner1.reseek(Bytes.toBytes("r2"));
    List<Cell> results = new ArrayList<Cell>();
    scanner1.next(results);
    Cell keyValue = results.get(0);
    Assert.assertTrue(Bytes.compareTo(CellUtil.cloneRow(keyValue), Bytes.toBytes("r2")) == 0);
    scanner1.close();
  }

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      // Make sure it shows up with an actual timestamp
      Get get = new Get(row).addColumn(fam, qual);
      Result result = region.get(get);
      assertEquals(1, result.size());
      Cell kv = result.rawCells()[0];
      LOG.info("Got: " + kv);
      assertTrue("LATEST_TIMESTAMP was not replaced with real timestamp",
          kv.getTimestamp() != HConstants.LATEST_TIMESTAMP);


      // Check same with WAL enabled (historically these took different
      // code paths, so check both)
      row = Bytes.toBytes("row2");
      put = new Put(row);
      put.add(fam, qual, HConstants.LATEST_TIMESTAMP, Bytes.toBytes("value"));
      region.put(put);


      // Make sure it shows up with an actual timestamp
      get = new Get(row).addColumn(fam, qual);
      result = region.get(get);
      assertEquals(1, result.size());
      kv = result.rawCells()[0];
      LOG.info("Got: " + kv);
      assertTrue("LATEST_TIMESTAMP was not replaced with real timestamp",
          kv.getTimestamp() != HConstants.LATEST_TIMESTAMP);
    } finally {
      HRegion.closeHRegion(this.region);
      this.region = null;
    }

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      InternalScanner s = region.getScanner(scan);


      List<Cell> results = new ArrayList<Cell>();
      assertEquals(false, s.next(results));
      assertEquals(1, results.size());
      Cell kv = results.get(0);


      assertArrayEquals(value2, CellUtil.cloneValue(kv));
      assertArrayEquals(fam1, CellUtil.cloneFamily(kv));
      assertArrayEquals(qual1, CellUtil.cloneQualifier(kv));
      assertArrayEquals(row, CellUtil.cloneRow(kv));

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    Get get = new Get(row);
    get.addColumn(familiy, qualifier);
    Result result = region.get(get);
    assertEquals(1, result.size());


    Cell kv = result.rawCells()[0];
    int r = Bytes.toInt(CellUtil.cloneValue(kv));
    assertEquals(amount, r);
  }

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              timestamp = kv.getTimestamp();
            }
          }
          assertTrue(timestamp >= prevTimestamp);
          prevTimestamp = timestamp;
          Cell previousKV = null;


          for (Cell kv : result.rawCells()) {
            byte[] thisValue = CellUtil.cloneValue(kv);
            if (previousKV != null) {
              if (Bytes.compareTo(CellUtil.cloneValue(previousKV), thisValue) != 0) {
                LOG.warn("These two KV should have the same value." + " Previous KV:" + previousKV
                    + "(memStoreTS:" + previousKV.getMvccVersion() + ")" + ", New KV: " + kv
                    + "(memStoreTS:" + kv.getMvccVersion() + ")");
                assertEquals(0, Bytes.compareTo(CellUtil.cloneValue(previousKV), thisValue));
              }
            }
            previousKV = kv;

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    Result res = this.region.get(get);
    List<Cell> kvs = res.getColumnCells(Incrementer.family, Incrementer.qualifier);


    // we just got the latest version
    assertEquals(kvs.size(), 1);
    Cell kv = kvs.get(0);
    assertEquals(expected, Bytes.toLong(kv.getValueArray(), kv.getValueOffset()));
    this.region = null;
  }

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    Result res = this.region.get(get);
    List<Cell> kvs = res.getColumnCells(Appender.family, Appender.qualifier);


    // we just got the latest version
    assertEquals(kvs.size(), 1);
    Cell kv = kvs.get(0);
    byte[] appendResult = new byte[kv.getValueLength()];
    System.arraycopy(kv.getValueArray(), kv.getValueOffset(), appendResult, 0, kv.getValueLength());
    assertArrayEquals(expected, appendResult);
    this.region = null;
  }

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    for (Cell kv : result.rawCells()) {
      if (i >= expKvList.size()) {
        break;  // we will check the size later
      }


      Cell kvExp = expKvList.get(i++);
      if (toLog) {
        LOG.info("get kv is: " + kv.toString());
        LOG.info("exp kv is: " + kvExp.toString());
      }
      assertTrue("Not equal", kvExp.equals(kv));
    }


    assertEquals(expKvList.size(), result.size());
  }

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