### Question:
RadosClient extends DB { @Override public Status read(String table, String key, Set<String> fields, HashMap<String, ByteIterator> result) { byte[] buffer; try { RadosObjectInfo info = ioctx.stat(key); buffer = new byte[(int)info.getSize()]; ReadOp rop = ioctx.readOpCreate(); ReadResult readResult = rop.queueRead(0, info.getSize()); rop.operate(key, 0); if (readResult.getRVal() < 0) { throw new RadosException("Error ReadOP", readResult.getRVal()); } if (info.getSize() != readResult.getBytesRead()) { return new Status("ERROR", "Error the object size read"); } readResult.getBuffer().get(buffer); } catch (RadosException e) { return new Status("ERROR-" + e.getReturnValue(), e.getMessage()); } JSONObject json = new JSONObject(new String(buffer, java.nio.charset.StandardCharsets.UTF_8)); Set<String> fieldsToReturn = (fields == null ? json.keySet() : fields); for (String name : fieldsToReturn) { result.put(name, new StringByteIterator(json.getString(name))); } return result.isEmpty() ? Status.ERROR : Status.OK; }  void init(); void cleanup(); @Override Status read(String table, String key, Set<String> fields, HashMap<String, ByteIterator> result); @Override Status insert(String table, String key, HashMap<String, ByteIterator> values); @Override Status delete(String table, String key); @Override Status update(String table, String key, HashMap<String, ByteIterator> values); @Override Status scan(String table, String startkey, int recordcount, Set<String> fields,
      Vector<HashMap<String, ByteIterator>> result); static final String CONFIG_FILE_PROPERTY; static final String CONFIG_FILE_DEFAULT; static final String ID_PROPERTY; static final String ID_DEFAULT; static final String POOL_PROPERTY; static final String POOL_DEFAULT; }### Answer:
@Test public void readTest() { HashMap<String, ByteIterator> ret = new HashMap<String, ByteIterator>(10); Status result = radosclient.read(TABLE_NAME, KEY0, DATA.keySet(), ret); assertEquals(Status.OK, result); compareMap(DATA, ret); }