【异常】lockfile.AlreadyLocked: ~/airflow/airflow-scheduler.pid is already locked

1 完整异常信息

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File "/usr/bin/airflow", line 32, in <module>     args.func(args)   File "/usr/lib/python2.7/site-packages/airflow/utils/cli.py", line 74, in wrapper     return f(*args, **kwargs)   File "/usr/lib/python2.7/site-packages/airflow/bin/cli.py", line 1000, in scheduler     with ctx:   File "/usr/lib/python2.7/site-packages/daemon/daemon.py", line 397, in __enter__     self.open()   File "/usr/lib/python2.7/site-packages/daemon/daemon.py", line 389, in open     self.pidfile.__enter__()   File "/usr/lib/python2.7/site-packages/lockfile/__init__.py", line 197, in __enter__     self.acquire()   File "/usr/lib/python2.7/site-packages/daemon/pidfile.py", line 60, in acquire     super(TimeoutPIDLockFile, self).acquire(timeout, *args, **kwargs)   File "/usr/lib/python2.7/site-packages/lockfile/pidlockfile.py", line 88, in acquire     self.path) lockfile.AlreadyLocked: /home/cloudera-scm/airflow/airflow-scheduler.pid is already locked

　　

问题

　　　　Airflow调度服务无法启动

解决办法

　　　　 删除pid文件，重启就ok了。