While airflow initdb, ImportError: cannot import name HiveOperator

Question

我最近为我的工作流程安装了 airflow。在创建我的项目时，我执行了以下命令：

airflow initdb

返回以下错误：

[2016-08-15 11:17:00,314] {__init__.py:36} INFO - Using executor SequentialExecutor
DB: sqlite:////Users/mikhilraj/airflow/airflow.db
[2016-08-15 11:17:01,319] {db.py:222} INFO - Creating tables
INFO  [alembic.runtime.migration] Context impl SQLiteImpl.
INFO  [alembic.runtime.migration] Will assume non-transactional DDL.
ERROR [airflow.models.DagBag] Failed to import: /usr/local/lib/python2.7/site-packages/airflow/example_dags/example_twitter_dag.py
Traceback (most recent call last):
    File "/usr/local/lib/python2.7/site-packages/airflow/models.py", line 247, in process_file
       m = imp.load_source(mod_name, file path)
    File "/usr/local/lib/python2.7/site-packages/airflow/example_dags/example_twitter_dag.py", line 26, in <module>
       from airflow.operators import BashOperator, HiveOperator, PythonOperator
ImportError: cannot import name HiveOperator
Done.

我在网上查了一些类似的问题，建议我安装airflow[hive]，pyhs2，但似乎没有用。

Answer 1

您在使用 HiveOperator 吗？您收到的错误似乎是由于示例 dags 之一引起的。在生产中，您可能应该将 load_examples 设置为 False 并仅在您使用 HiveOperator 时安装 airflow[hive]。

话虽这么说，但不确定为什么 airflow[hive] 对您来说还不够。您可以尝试安装 airflow[hive,hdfs,jdbc]，但 airflow[hive] 应该足以消除 HiveOperator 导入错误。您能否添加您遇到的其他错误？

Answer 2

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/airflow/models.py", line 247, in process_file
    m = imp.load_source(mod_name, filepath)
  File "/usr/local/lib/python2.7/dist-packages/airflow/example_dags/example_twitter_dag.py", line 26, in <module>
    from airflow.operators import BashOperator, HiveOperator, PythonOperator
ImportError: cannot import name HiveOperator

如果您仍想继续安装示例数据...对于 Ubuntu 14.04，请将此方法与最新的 python 2.7 一起使用。（在 DO 测试）

1.apt-get update

2.apt-get install python-pip python-dev build-essential

3.pip install --upgrade pip

3a.which pip #/usr/local/bin/pip

3b.pip -V #pip 9.0.1 from /usr/local/lib/python2.7/dist-packages (python 2.7)

4.pip install --upgrade virtualenv

(Task 5 is optional)

5.apt-get install sqlite3 libsqlite3-dev

https://askubuntu.com/questions/683601/how-to-upgrade-python-setuptools-12-2-on-ubuntu-15-04

6.apt-get remove python-setuptools

7.pip install -U pip setuptools

8.export AIRFLOW_HOME=~/airflow

9.pip install airflow

10.pip install airflow[hive]

11.airflow initdb

您将在下面收到此回复

[2017-02-01 12:04:28,289] {__init__.py:36} INFO - Using executor SequentialExecutor
[2017-02-01 12:04:28,350] {driver.py:120} INFO - Generating grammar tables from /usr/lib/python2.7/lib2to3/Grammar.txt
[2017-02-01 12:04:28,376] {driver.py:120} INFO - Generating grammar tables from /usr/lib/python2.7/lib2to3/PatternGrammar.txt
DB: sqlite:////root/airflow/airflow.db
[2017-02-01 12:04:28,522] {db.py:222} INFO - Creating tables
INFO  [alembic.runtime.migration] Context impl SQLiteImpl.
INFO  [alembic.runtime.migration] Will assume non-transactional DDL.
Done.

注意：如果适用，请应用必要的 sudo 命令

Answer 3

检查dag文件中是否导入了hive operator？如果没有，您可以执行以下操作：

from airflow.operators.hive_operator import HiveOperator

While airflow initdb, ImportError: cannot import name HiveOperator

While airflow initdb, ImportError: cannot import name HiveOperator

hive

python-2.7

airflow