在多进程调度程序中使用dask时Loguru错误

Question

在尝试使用启用了RuntimeError的记录器处理程序从dask.delayed函数进行日志记录时，我将获得一个enqueue。

下面是一个最小可重现性的例子

import sys, dask
from loguru import logger

logger.add(sys.stderr, enqueue=True)

@dask.delayed
def log():
    logger.info("Logging!")

dask.compute(*[log() for i in range(10)], scheduler="processes")

它会产生以下错误：

RuntimeError: SimpleQueue objects should only be shared between processes through inheritance

Answer 1

解决办法很简单。从delayed函数中导入记录器：

In [1]: import sys, dask
   ...: from loguru import logger
   ...: 
   ...: logger.add(sys.stderr, enqueue=True)
   ...: 
   ...: @dask.delayed
   ...: def log():
   ...:     from loguru import logger
   ...:     logger.info("Logging!")
   ...: 
   ...: dask.compute(*[log() for i in range(10)], scheduler="processes")
2022-09-13 21:42:36.001 | INFO     | __main__:log:9 - Logging!
2022-09-13 21:42:36.001 | INFO     | __main__:log:9 - Logging!
2022-09-13 21:42:36.001 | INFO     | __main__:log:9 - Logging!
2022-09-13 21:42:36.001 | INFO     | __main__:log:9 - Logging!
2022-09-13 21:42:36.002 | INFO     | __main__:log:9 - Logging!
2022-09-13 21:42:36.002 | INFO     | __main__:log:9 - Logging!
2022-09-13 21:42:36.004 | INFO     | __main__:log:9 - Logging!
2022-09-13 21:42:36.004 | INFO     | __main__:log:9 - Logging!
2022-09-13 21:42:36.004 | INFO     | __main__:log:9 - Logging!
2022-09-13 21:42:36.004 | INFO     | __main__:log:9 - Logging!
Out[1]: (None, None, None, None, None, None, None, None, None, None)