code: ColumnOrSuperColumn getColumn(ByteBuffer key, ColumnPath colPath) {
          m_logger.debug("Fetching {}.{}", new Object[]{Utils.toString(key), toString(colPath)});
          ColumnOrSuperColumn column = null;
          boolean bSuccess = false;
          for (int attempts = 1; !bSuccess; attempts++) {
              try {
                  // Attempt to retrieve a slice list.
                  Date startDate = new Date();
                  column = m_client.get(key, colPath, ConsistencyLevel.ONE);
                  timing("get", startDate);
                  if (attempts > 1) {
                      m_logger.info("get() succeeded on attempt #{}", attempts);
                  }
                  bSuccess = true;
              } catch (NotFoundException ex) {
                  return null;
              } catch (InvalidRequestException ex) {
                  // No point in retrying this one.
                  String errMsg = "get() failed for table: " + colPath.getColumn_family();
                  m_bFailed = true;
                  m_logger.error(errMsg, ex);
                  throw new RuntimeException(errMsg, ex);
              } catch (Exception ex) {
                  // Abort if all retries exceeded.
                  if (attempts >= m_max_read_attempts) {
                      String errMsg = "All retries exceeded; abandoning get() for table: " +
                                      colPath.getColumn_family();
                      m_bFailed = true;
                      m_logger.error(errMsg, ex);
                      throw new RuntimeException(errMsg, ex);
                  }
                  
                  // Report retry as a warning.
                  m_logger.warn("get() attempt #{} failed: {}", attempts, ex);
                  try {
                      Thread.sleep(attempts * m_retry_wait_millis);
                  } catch (InterruptedException e1) {
                      // ignore
                  }
                  reconnect(ex);
              }
          }
          return column;
      }
docs: Fetch a single column.