How do I log from my Python Spark script

Question

I have a Python Spark program which I run with spark-submit. I want to put logging statements in it.

logging.info("This is an informative message.") logging.debug("This is a debug message.") 

I want to use the same logger that Spark is using so that the log messages come out in the same format and the level is controlled by the same configuration files. How do I do this?

I've tried putting the logging statements in the code and starting out with a logging.getLogger(). In both cases I see Spark's log messages but not mine. I've been looking at the Python logging documentation, but haven't been able to figure it out from there.

Not sure if this is something specific to scripts submitted to Spark or just me not understanding how logging works.

Answer 1

You can get the logger from the SparkContext object:

log4jLogger = sc._jvm.org.apache.log4j LOGGER = log4jLogger.LogManager.getLogger(__name__) LOGGER.info("pyspark script logger initialized") 

Answer 2

You need to get the logger for spark itself, by default getLogger() will return the logger for you own module. Try something like:

logger = logging.getLogger('py4j') logger.info("My test info statement") 

It might also be 'pyspark' instead of 'py4j'.

In case the function that you use in your spark program (and which does some logging) is defined in the same module as the main function it will give some serialization error.

This is explained here and an example by the same person is given here

I also tested this on spark 1.3.1

EDIT:

To change logging from STDERR to STDOUT you will have to remove the current StreamHandler and add a new one.

Find the existing Stream Handler (This line can be removed when finished)

print(logger.handlers) # will look like [<logging.StreamHandler object at 0x7fd8f4b00208>] 

There will probably only be a single one, but if not you will have to update position.

logger.removeHandler(logger.handlers[0]) 

Add new handler for sys.stdout

import sys # Put at top if not already there sh = logging.StreamHandler(sys.stdout) sh.setLevel(logging.DEBUG) logger.addHandler(sh)