django 1.3 logging timedrotatingfilehandler truncating file on every write

Question

I am using django 1.3's logging feature and trying to implement a timedrotatingfilehandler to rotate logs every hour.The logger is rotating successfully after every hour but it seems during every log request it truncates the file.The file has only the last written message.Is this an issue in django handler or am i missing somewhere.The logging dictionary is below:

LOGGING = {
'version': 1,
'disable_existing_loggers': True,
'formatters': {
    'standard': {
        'format' : "%(asctime)s:%(pathname)s:%(lineno)s: %(message)s",
        'datefmt' : "%d/%b/%Y %H:%M:%S"
    },
},
'handlers': {
    'logfile': {
        'level':'DEBUG',
        'class':'logging.handlers.TimedRotatingFileHandler',
        'filename': "/tmp/log1.log",
    'when' : 'hour',
    'interval' : 0,
        'formatter': 'standard',
    },
},
'loggers': {
    'collection': {
        'handlers': ['logfile'],
        'level': 'DEBUG',
    },
}
}

Please note: when the interval is set to 1, the log is not getting rotated.Is this a bug in django?

zvikico zvikico · Accepted Answer · 2012-05-02T10:15:16

You need to set:

'when' : 'H',
'interval' : 1,

From the code, current 'when' events supported:

S - Seconds
M - Minutes
H - Hours
D - Days
midnight - roll over at midnight
W{0-6} - roll over on a certain day; 0 - Monday

Interval is the number of intervals to count (e.g. when == 'H' and interval == 2 will result in 2 hours).

django 1.3 logging timedrotatingfilehandler truncating file on every write

3 Answers