How to fix the error "AirflowException("Hostname of job runner does not match")"? - airflow

Question

I'm running airflow on my computer (Mac AirBook, 1.6 GHz Intel Core i5 and 8 GB 2133 MHz LPDDR3). A DAG with several tasks, failed with below error. Checked several articles online but with little to no help. There is nothing wrong with the task itself(double checked).
Any help is much appreciated.
[2019-08-27 13:01:55,372] {sequential_executor.py:45} INFO - Executing command: ['airflow', 'run', 'Makefile_DAG', 'normalize_companies', '2019-08-27T15:38:20.914820+00:00', '--local', '--pool', 'default_pool', '-sd', '/home/airflow/dags/makefileDAG.py']
[2019-08-27 13:01:56,937] {settings.py:213} INFO - settings.configure_orm(): Using pool settings. pool_size=5, max_overflow=10, pool_recycle=1800, pid=40647
[2019-08-27 13:01:57,285] {__init__.py:51} INFO - Using executor SequentialExecutor
[2019-08-27 13:01:59,423] {dagbag.py:90} INFO - Filling up the DagBag from /home/airflow/dags/makefileDAG.py
[2019-08-27 13:02:01,736] {cli.py:516} INFO - Running <TaskInstance: Makefile_DAG.normalize_companies 2019-08-27T15:38:20.914820+00:00 [queued]> on host ajays-macbook-air.local
Traceback (most recent call last):
File "/anaconda3/envs/airflow/bin/airflow", line 32, in <module>
args.func(args)
File "/anaconda3/envs/airflow/lib/python3.6/site-packages/airflow/utils/cli.py", line 74, in wrapper
return f(*args, **kwargs)
File "/anaconda3/envs/airflow/lib/python3.6/site-packages/airflow/bin/cli.py", line 522, in run
_run(args, dag, ti)
File "/anaconda3/envs/airflow/lib/python3.6/site-packages/airflow/bin/cli.py", line 435, in _run
run_job.run()
File "/anaconda3/envs/airflow/lib/python3.6/site-packages/airflow/jobs/base_job.py", line 213, in run
self._execute()
File "/anaconda3/envs/airflow/lib/python3.6/site-packages/airflow/jobs/local_task_job.py", line 111, in _execute
self.heartbeat()
File "/anaconda3/envs/airflow/lib/python3.6/site-packages/airflow/jobs/base_job.py", line 196, in heartbeat
self.heartbeat_callback(session=session)
File "/anaconda3/envs/airflow/lib/python3.6/site-packages/airflow/utils/db.py", line 70, in wrapper
return func(*args, **kwargs)
File "/anaconda3/envs/airflow/lib/python3.6/site-packages/airflow/jobs/local_task_job.py", line 159, in heartbeat_callback
raise AirflowException("Hostname of job runner does not match")
airflow.exceptions.AirflowException: Hostname of job runner does not match
[2019-08-27 13:05:05,904] {sequential_executor.py:52} ERROR - Failed to execute task Command '['airflow', 'run', 'Makefile_DAG', 'normalize_companies', '2019-08-27T15:38:20.914820+00:00', '--local', '--pool', 'default_pool', '-sd', '/home/airflow/dags/makefileDAG.py']' returned non-zero exit status 1..
[2019-08-27 13:05:05,905] {scheduler_job.py:1256} INFO - Executor reports execution of Makefile_DAG.normalize_companies execution_date=2019-08-27 15:38:20.914820+00:00 exited with status failed for try_number 2
Logs from the task:
[2019-08-27 13:02:13,616] {bash_operator.py:115} INFO - Running command: python /home/Makefile_Redo/normalize_companies.py
[2019-08-27 13:02:13,628] {bash_operator.py:124} INFO - Output:
[2019-08-27 13:05:02,849] {logging_mixin.py:95} INFO - [[34m2019-08-27 13:05:02,848[0m] {[34mlocal_task_job.py:[0m158} [33mWARNING[0m - [33mThe recorded hostname [1majays-macbook-air.local[0m does not match this instance's hostname [1mAJAYs-MacBook-Air.local[0m[0m
[2019-08-27 13:05:02,860] {helpers.py:319} INFO - Sending Signals.SIGTERM to GPID 40649
[2019-08-27 13:05:02,861] {taskinstance.py:897} ERROR - Received SIGTERM. Terminating subprocesses.
[2019-08-27 13:05:02,862] {bash_operator.py:142} INFO - Sending SIGTERM signal to bash process group
[2019-08-27 13:05:03,539] {taskinstance.py:1047} ERROR - Task received SIGTERM signal
Traceback (most recent call last):
File "/anaconda3/envs/airflow/lib/python3.6/site-packages/airflow/models/taskinstance.py", line 922, in _run_raw_task
result = task_copy.execute(context=context)
File "/anaconda3/envs/airflow/lib/python3.6/site-packages/airflow/operators/bash_operator.py", line 126, in execute
for line in iter(sp.stdout.readline, b''):
File "/anaconda3/envs/airflow/lib/python3.6/site-packages/airflow/models/taskinstance.py", line 899, in signal_handler
raise AirflowException("Task received SIGTERM signal")
airflow.exceptions.AirflowException: Task received SIGTERM signal
[2019-08-27 13:05:03,550] {taskinstance.py:1076} INFO - All retries failed; marking task as FAILED
A weird thing I noticed from above log is:
The recorded hostname [1majays-macbook-air.local[0m does not match this instance's hostname [1mAJAYs-MacBook-Air.local[0m[0m
How is this possible and any solution to fix this?

Answer 1

I had the same problem on my Mac. The solution that worked for me was updating airflow.cfg with hostname_callable = socket:gethostname. The original getfqdn returns different hostnames from time to time.