logging - How do I specify output log file during spark submit

Question

I know how to provide the logger properties file to spark. So my logger properties file looks something like:

log4j.rootCategory=INFO,FILE
log4j.appender.FILE=org.apache.log4j.RollingFileAppender
log4j.appender.FILE.File=/tmp/outfile.log
log4j.appender.FILE.MaxFileSize=1000MB
log4j.appender.FILE.MaxBackupIndex=2
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
log4j.appender.rolling.strategy.type = DefaultRolloverStrategy

And then I provide the logger properties file path to spark-submit via: -Dlog4j.configuration=file:logger_file_path

However, I wanted to provide log4j.appender.FILE.File value during spark-submit. Is there a way I can do that?

With regards to justification for the above approach, I am doing spark-submit on multiple YARN queues. Since the Spark code base is the same, I would just want a different log file for spark submit on different queues.

Answer 1

In the log4j file properties, you can use expressions like this:

log4j.appender.FILE.File=${LOGGER_OUTPUT_FILE}

When parsed, the value for log4j.appender.FILE.File will be picked from the system property LOGGER_OUTPUT_FILE.

As per this SO post, you can set the value for the system property by adding -DLOGGER_OUTPUT_FILE=/tmp/outfile.log when invoking the JVM.

So using spark-submit you may try this (I haven't tested it):

spark-submit --master yarn 
  --files /path/to/my-custom-log4j.properties 
  --conf "spark.driver.extraJavaOptions=-Dlog4j.configuration=my-custom-log4j.properties -DLOGGER_OUTPUT_FILE=/tmp/outfile.log" 
  --conf "spark.executor.extraJavaOptions=-Dlog4j.configuration=my-custom-log4j.properties -DLOGGER_OUTPUT_FILE=/tmp/outfile.log"