topic How to add I custom logging in Databricks in Data Engineering

How to add I custom logging in Databricks

brickster_2018 — Thu, 24 Jun 2021 06:37:25 GMT

I want to add custom logs that redirect in the Spark driver logs. Can I use the existing logger classes to have my application logs or progress message in the Spark driver logs.

Re: How to add I custom logging in Databricks

brickster_2018 — Thu, 24 Jun 2021 08:35:27 GMT

Set custom log messages in Scala:

%scala 
 
import org.slf4j.{Logger, LoggerFactory}
 
val customLogs = LoggerFactory.getLogger("CustomLogs")
 
customLogs.info("Testing INFO Logs")
 
customLogs.warn("Testing WARN Logs")
 
customLogs.error("Testing ERROR Logs")
 
print("This message will be in stdout instead of log4j")

Set custom logs messages in Python

%python
 
log4jLogger = spark.sparkContext._jvm.org.apache.log4j 
 
customLogs = log4jLogger.LogManager.getLogger("CustomLogs") 
 
 
customLogs.info("Testing INFO Logs")
 
customLogs.warn("Testing WARN Logs")
 
customLogs.error("Testing ERROR Logs")
 
print("This message will be in stdout instead of log4j")

Re: How to add I custom logging in Databricks

Kaizen — Tue, 06 Feb 2024 21:38:49 GMT

Adding more clarity for people using this. The log files will be located in dbfs:/cluster-logs/<cluster_id>/driver/log4j-active.log

@brickster_2018 is there a way to get the custom logs saved in its own .log file? Im guessing we would have to manually connect to azure blob and store it there (via azure-storage-logging python library)

Re: How to add I custom logging in Databricks

Kaizen — Fri, 09 Feb 2024 18:24:18 GMT

1) Is it possible to save all the custom logging to its own file? Currently it is being logging with all other cluster logs (see image)

2) Also Databricks it seems like a lot of blank files are also being created for this. Is this a bug? this includes the stderr and stdout files in the driver @Debayan