- Loggers will send to stderr by default. So make sure stderr has a receiver.
Logger manager
Loggers will be stored in manager in Python. Handlers will cause resource leak if not removed.
def getLogger(name=None):
"""
Return a logger with the specified name, creating it if necessary.
If no name is specified, return the root logger.
"""
if name:
return Logger.manager.getLogger(name)
else:
return root
class Manager(object):
def getLogger(self, name):
"""
Get a logger with the specified name (channel name), creating it
if it doesn't yet exist. This name is a dot-separated hierarchical
name, such as "a", "a.b", "a.b.c" or similar.
If a PlaceHolder existed for the specified name [i.e. the logger
didn't exist but a child of it did], replace it with the created
logger and fix up the parent/child references which pointed to the
placeholder to now point to the logger.
"""
rv = None
if not isinstance(name, basestring):
raise TypeError('A logger name must be string or Unicode')
if isinstance(name, unicode):
name = name.encode('utf-8')
_acquireLock()
try:
if name in self.loggerDict:
rv = self.loggerDict[name]
if isinstance(rv, PlaceHolder):
ph = rv
rv = (self.loggerClass or _loggerClass)(name)
rv.manager = self
self.loggerDict[name] = rv
self._fixupChildren(ph, rv)
self._fixupParents(rv)
else:
rv = (self.loggerClass or _loggerClass)(name)
rv.manager = self
self.loggerDict[name] = rv
self._fixupParents(rv)
finally:
_releaseLock()
return rv
Loggers in Python are stored in Logger.manager with a specified name. If create a logger with a task rather than a file, loggers stored in manager will increase and never be deleted.
It becomes even worse when the logger has a handler, eg. write logs to database. It may cause a connections leak.
Log emit will hang if stderr is not received
Log info will send to stderr by default, make sure stderr buffer has a removed, otherwise stream write will be blocked.
