气流信号出乎意料地向子过程发出信号 [英] Airflow signals SIGTERM to subprocesses unexpectedly

问题描述

我正在使用PythonOperator调用一个函数，该函数将数据工程流程并行化为气流任务。这只需用Airflow调用的可调用包装函数包装一个简单函数即可。

def wrapper(ds, **kwargs):
    process_data()

使用派生子进程的多处理模块实现并行化。当我从jupyter笔记本单独运行process_data时，它运行到最后都没有问题。然而，当我使用气流运行它时，任务失败，任务的日志显示如下所示。

[2019-01-22 17:16:46,966] {models.py:1610} ERROR - Received SIGTERM. Terminating subprocesses.
[2019-01-22 17:16:46,969] {logging_mixin.py:95} WARNING - Process ForkPoolWorker-129:

[2019-01-22 17:16:46,973] {logging_mixin.py:95} WARNING - Traceback (most recent call last):

[2019-01-22 17:16:46,973] {logging_mixin.py:95} WARNING -   File "/usr/lib/python3.5/multiprocessing/process.py", line 249, in _bootstrap
    self.run()

[2019-01-22 17:16:46,973] {logging_mixin.py:95} WARNING -   File "/home/airflow/.env/lib/python3.5/site-packages/airflow/models.py", line 1612, in signal_handler
    raise AirflowException("Task received SIGTERM signal")

[2019-01-22 17:16:46,973] {logging_mixin.py:95} WARNING - airflow.exceptions.AirflowException: Task received SIGTERM signal

[2019-01-22 17:16:46,993] {models.py:1610} ERROR - Received SIGTERM. Terminating subprocesses.
[2019-01-22 17:16:46,996] {logging_mixin.py:95} WARNING - Process ForkPoolWorker-133:

[2019-01-22 17:16:46,999] {logging_mixin.py:95} WARNING - Traceback (most recent call last):

[2019-01-22 17:16:46,999] {logging_mixin.py:95} WARNING -   File "/usr/lib/python3.5/multiprocessing/process.py", line 249, in _bootstrap
    self.run()

[2019-01-22 17:16:46,999] {logging_mixin.py:95} WARNING -   File "/usr/lib/python3.5/multiprocessing/process.py", line 93, in run
    self._target(*self._args, **self._kwargs)

[2019-01-22 17:16:46,999] {logging_mixin.py:95} WARNING -   File "/usr/lib/python3.5/multiprocessing/pool.py", line 108, in worker
    task = get()

[2019-01-22 17:16:46,999] {logging_mixin.py:95} WARNING -   File "/usr/lib/python3.5/multiprocessing/queues.py", line 343, in get
    res = self._reader.recv_bytes()

[2019-01-22 17:16:46,999] {logging_mixin.py:95} WARNING -   File "/usr/lib/python3.5/multiprocessing/synchronize.py", line 99, in __exit__
    return self._semlock.__exit__(*args)

[2019-01-22 17:16:46,999] {logging_mixin.py:95} WARNING -   File "/home/airflow/.env/lib/python3.5/site-packages/airflow/models.py", line 1612, in signal_handler
    raise AirflowException("Task received SIGTERM signal")

[2019-01-22 17:16:46,999] {logging_mixin.py:95} WARNING - airflow.exceptions.AirflowException: Task received SIGTERM signal

[2019-01-22 17:16:47,086] {logging_mixin.py:95} INFO - file parsing and processing 256.07

[2019-01-22 17:17:12,938] {logging_mixin.py:95} INFO - combining and sorting 25.85

我不太确定为什么任务会收到SIGTERM。我的猜测是，某个更高级别的进程正在将这些消息发送给子进程。我应该如何调试此问题？

我刚刚注意到，在接近任务日志末尾时，它清楚地表明

airflow.exceptions.AirflowException: Task received SIGTERM signal
[2019-01-22 12:31:39,196] {models.py:1764} INFO - Marking task as FAILED.

推荐答案

我按照答案here操作。 想法是一样的：不让气流过早关闭线程：

export AIRFLOW__CORE__KILLED_TASK_CLEANUP_TIME=604800成功了。

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