backend/src/main/java/org/apache/iotdb/admin/service/impl/IotDBServiceImpl.java [4814:4826]:
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  public static SessionPool getSessionPool(Connection connection) throws BaseException {
    String host = connection.getHost();
    Integer port = connection.getPort();
    String username = connection.getUsername();
    String password = connection.getPassword();
    SessionPool sessionPool = null;
    try {
      sessionPool = new SessionPool(host, port, username, password, 3);
    } catch (Exception e) {
      throw new BaseException(ErrorCode.GET_SESSION_FAIL, ErrorCode.GET_SESSION_FAIL_MSG);
    }
    return sessionPool;
  }
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backend/src/main/java/org/apache/iotdb/admin/service/impl/MetricsServiceImpl.java [1693:1705]:
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  public static SessionPool getSessionPool(Connection connection) throws BaseException {
    String host = connection.getHost();
    Integer port = connection.getPort();
    String username = connection.getUsername();
    String password = connection.getPassword();
    SessionPool sessionPool = null;
    try {
      sessionPool = new SessionPool(host, port, username, password, 3);
    } catch (Exception e) {
      throw new BaseException(ErrorCode.GET_SESSION_FAIL, ErrorCode.GET_SESSION_FAIL_MSG);
    }
    return sessionPool;
  }
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