How to log into HDFS using standard logging library. More specifically, I am using TimedRotatingFileHandler like this:
FORMATTER = logging.Formatter("%(asctime)s — %(name)s — %(levelname)s — %(message)s")
LOG_FILE = 'hdfs://node01:8022/tmp/test/run_dev.log'
def get_file_handler():
file_handler = TimedRotatingFileHandler(LOG_FILE, when='midnight')
file_handler.setFormatter(FORMATTER)
return file_handler
def get_logger(logger_name):
logger = logging.getLogger(logger_name)
if (logger.hasHandlers()): logger.handlers.clear()
logger.addHandler(get_file_handler())
logger.propagate = False
return logger
However it seems that I cannot pass fully qualified HDFS path as I was expecting. I am getting
FileNotFoundError: [Errno 2] No such file or directory: '/home/bigdatamgr/hdfs:/node01:8022/tmp/test/run_dev.log'
Is there some way to achieve this functionality?
Related
import logging
def setup_logger(logger_name, log_file, level=logging.DEBUG):
l = logging.getLogger(logger_name)
formatter = logging.Formatter('%(asctime)s : %(levelname)s : %(message)s')
fileHandler = logging.FileHandler(log_file, mode='w')
fileHandler.setFormatter(formatter)
streamHandler = logging.StreamHandler()
streamHandler.setFormatter(formatter)
l.setLevel(level)
l.addHandler(fileHandler)
l.addHandler(streamHandler)
I'm trying to write the different logs(levels) to the different files the functionality is working fine but when ever the application is restarted the log files get reset instead of appending the data to it.
#method called from the different method
setup_logger('logger', 'login.log')
setup_logger('logger_market', 'transaction.log')
logger = logging.getLogger('logger')
logger_market = logging.getLogger('logger_market')
logger.info(f'Test for the login.log file')
logger_market.info(f'this to test')
I'm new to logging in python and the documentation is a bit complex for me at the moment.
I think you do not need to set mode
just use following: fileHandler = logging.FileHandler(log_file)
I'm trying to create logger file inside directory using the below code -
def createLogger(name,log_path=None):
logger = logging.getLogger(name)
logger.setLevel(logging.DEBUG)
logger.setLevel(logging.ERROR)
logger.setLevel(logging.INFO)
logger.setLevel(logging.CRITICAL)
formatter = logging.Formatter("%(asctime)s - %(levelname)-8s - %(message)s")
stream_handler = logging.StreamHandler()
stream_handler.setFormatter(formatter)
logger.addHandler(stream_handler)
if log_path is not None:
file_handler = logging.FileHandler(log_path)
file_handler.setFormatter(formatter)
logger.addHandler(file_handler)
return logger
name = "temp_logs"
file = open(os.path.join(f'{current_date}', f'{name}_{current_timestamp}.txt'), 'w')
log_path = f"{current_date}/{name}_{current_timestamp}.txt"
logger = createLogger(name = name ,log_path = log_path)
write_message = logger.debug('This is a test file')
file.writelines(str(write_message))
file.close()
However, it is just writing None as message inside the file.
Am I missing anything here? Please help.
Several issues. setLevel sets a threshold. When called multiple times, the last one wins (i.e. CRITICAL). You will not see any debug messages, warnings or error.
Also, you are writing to the log file directly. What's the point of setting a logger with a formatter and then bypassing it?
Try this:
Leave only this one setLevel call: logger.setLevel(logging.DEBUG) in createLogger() and then:
name = "temp_logs"
logger = createLogger(name = name ,log_path = './test.log')
logger.debug('This is a debug message')
logger.error('This is an error')
I'm trying to create my own logger in python 3.6.8 to send output both to stdout and a log file (chosen by date, if the log file doesn't exist yet for today's date it gets created, if there already is a file with the same date just append).
from datetime import date
import logging
import logging.handlers
class Log:
def __init__(self):
pass
def getCleanerLogger(self,moduleName, logFolder, format):
filename = logFolder+ str(date.today()) + '-log.log'
handler = logging.FileHandler(filename)
shandler = logging.StreamHandler()
shandler.setLevel(logging.INFO)
handler.setLevel(logging.DEBUG)
formatter = logging.Formatter(format)
handler.setFormatter(formatter)
shandler.setFormatter(formatter)
logger = logging.getLogger(moduleName)
logger.addHandler(handler)
logger.addHandler(shandler)
print("I've been called")
return logger
import Conf
conf = Conf.configuration()
print(conf['logFolder'] + " " + conf['logFormat'])
logger = Log()
logger = logger.getCleanerLogger("Log", conf['logFolder'], conf['logFormat'])
logger.info('initializing')
logger.debug('initializing debug')
in the json conf file these are the keys I load
"logFolder": "log/",
"logFormat": "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
the log file gets created with the correct logic but there is no logging in either the console or the log file, only the prints go to stdout, no error or exception is raised, I really don't understand why this isn't working. I can only log with logging.root.level('msg') after loading a basiconfig.
Every handler has own logging level but logger has also global logging level which has bigger prioritet so you have to change this level to level which doesn't block handlers - ie.
logger.setLevel(logging.DEBUG)
Mininal working code with few smaller changes.
It doesn't use file with settings so everyone can easily copy it and run it.
from datetime import date
import os
import logging
import logging.handlers
class Log:
def get_cleaner_logger(self, module_name, log_folder, format):
if not os.path.exists(log_folder):
os.makedirs(log_folder)
filename = os.path.join(log_folder, date.today().strftime('%Y-%m-%d-log.log'))
print(filename)
logger = logging.getLogger(module_name)
print('before:', logger.level)
logger.setLevel(logging.DEBUG)
print('after:', logger.level)
formatter = logging.Formatter(format)
handler = logging.FileHandler(filename)
handler.setLevel(logging.DEBUG)
handler.setFormatter(formatter)
logger.addHandler(handler)
shandler = logging.StreamHandler()
shandler.setLevel(logging.INFO)
shandler.setFormatter(formatter)
logger.addHandler(shandler)
print("I've been called")
return logger
conf = {
"logFolder": "log/",
"logFormat": "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
}
logger = Log()
logger = logger.get_cleaner_logger("Log", conf['logFolder'], conf['logFormat'])
logger.info('initializing')
logger.debug('initializing debug')
BTW: I changed some names based on PEP 8 -- Style Guide for Python Code
I've written an init function to configure the python logging module to log to a file and the console. I want to limit the log file size using the RotatingFileHandler. The code below doesn't cause any errors and does everything I want, except it doesn't rotate the logs. I set a low file size to test things out.
How can I configure to use rotating logs and the console with different formats like below?
import logging, logging.handlers
LOG_LEVEL = logging.DEBUG
CONSOLE_LEVEL = logging.DEBUG
def init_logger(fullpath, console_level=CONSOLE_LEVEL, log_level=LOG_LEVEL):
"""
Setup the logger object
Args:
fullpath (str): full path to the log file
"""
logging.basicConfig(level=LOG_LEVEL,
format='%(asctime)s %(threadName)-10s %(name)-12s %
(levelname)-8s %(message)s',
datefmt='%m-%d-%y %H:%M:%S',
filename=fullpath,
filemode='w')
_logger = logging.getLogger('_root')
_logger.setLevel(log_level)
log_handler = logging.handlers.RotatingFileHandler(filename=fullpath,
maxBytes=50, backupCount=10)
log_handler.setLevel(log_level)
_logger.addHandler(log_handler)
console = logging.StreamHandler()
console.setLevel(console_level)
# set a format which is simpler for console use
formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %
(message)s')
# tell the handler to use this format
console.setFormatter(formatter)
# add the handler to the root logger
logging.getLogger('').addHandler(console)
logging.debug("Creating log file")
This is your logging's structure:
---root <- I mean real root, which you will get from logging.getLogger([""])
---NormalFileHandler <- Configged by logging.basicConfig, this handler won't rotate file.
---StreamHandler
------_root <- Your root logger, although I don't understand why you want this.
------RotatingFileHandler <- This one will rotate file.
And then you use logging.debug("Creating log file"), which is the same as calling debug on root logger: logging.getLogger().debug(...). So this log passed to StreamHandler and NormalFileHandler.
That's why you see the file isn't got rotated.
The correct configuration should be:
def init_logger(fullpath, console_level=CONSOLE_LEVEL, log_level=LOG_LEVEL):
"""
Setup the logger object
Args:
fullpath (str): full path to the log file
"""
logger = logging.getLogger('YourLogger')
logger.setLevel(log_level)
log_handler = logging.handlers.RotatingFileHandler(filename=fullpath,
maxBytes=50, backupCount=10)
log_handler.setLevel(log_level)
formatter = logging.Formatter('%(asctime)s %(threadName)-10s %(name)-12s %
(levelname)-8s %(message)s')
log_handler.setFormatter(formatter)
logger.addHandler(log_handler)
console = logging.StreamHandler()
console.setLevel(console_level)
formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %
(message)s')
console.setFormatter(formatter)
logger.addHandler(console) # Or you can add it to root logger, but it is not recommended, you should use your own logger instead of root logger. Or it will cause some problems.
logger.debug("Creating log file")
And then when you want to use logger, you should use:
logger = logging.getLogger('YourLogger')
logger.info(...)
logger.debug(...)
I have my own logging system that is not based on a logging object.
Can I still enjoy the services of RotatingFileHnadler? I've tried to define the handler after I set the log file. But I don't see it performed any rotation (no files added named for example mylog.log.1, mylog.log.2 ...)
What am I missing?
handler = RotatingFileHandler(self.fullName+'.debug',mode='a', maxBytes=1, backupCount=1)
logFormatter = logging.Formatter("%(asctime)s [%(levelname)-5.5s] %(message)s")
fileHandler = RotatingFileHandler('/var/log/blabla.log',
maxBytes=10 * 1000 * 1000,
encoding='utf8',
backupCount=5)
fileHandler.setFormatter(logFormatter)
rootLogger = logging.getLogger()
rootLogger.setLevel(logging.INFO)
rootLogger.addHandler(fileHandler)