redirectToLog: new-bee question

[Jae Yoon Yoo]

Hello,

My application is launched by SparkLauncher and I am trying to collect all logs 
(from launcher, application, and Spark core(?)) into one log file.
I can see all those from the console (using Eclipse IDE) but can’t make them to 
be written in the log file. With the (simplified) code under, only log (in the 
log file) I see is from the launcher.

For testing purpose, I used redirectOutput(java.io.File) and with it I can see 
the application’s log also in the log file but not Spark core’s.
Spark core’s (if I am not using the name properly, please correct) output - I 
mean, like under and the exception messages if happens.

INFO: 19/10/10 15:50:08 INFO Utils: Successfully started service 'sparkDriver' 
on port 62573.

Can you shed some light for me? Thanks in advance,
/ Jae

Reference: 
https://stackoverflow.com/questions/45781842/save-spark-launcher-output-to-file
Spark version: 2.4.3
Code example: the launcher and the application (TestLog),

public class LauncherTest {

      final static Logger log = Logger.getLogger(LauncherTest.class);

      public static void main(String[] args) throws Exception {

            String log4jConfPath = "log4j.properties";
            PropertyConfigurator.configure(log4jConfPath);

            String appName = LauncherTest.class.getName();

            log.info("appName=" + appName);  // this I see in the log file and 
the console

            SparkLauncher launcher = new SparkLauncher()
                        .setAppResource(myJar)
                        .setMainClass(myClass)
                        .setSparkHome(sparkHome)
                        .setMaster("local[*]")
                        .setAppName(appName);

            launcher.redirectToLog(LauncherTest.class.getName());

            SparkAppHandle handle = launcher.startApplication();
            State state = handle.getState();

            while (state == null || !state.isFinal()) {
                  Thread.sleep(1000);
                  state = handle.getState();
                  if (state != null) {
                        log.info("state: " + state.toString());
                  }
            }
      }
}

public class TestLog {

      public static void main(String[] args) throws Exception {

            System.out.println("TestLog: start"); // this I see in the console 
but not in the log file

            SparkSession spark = SparkSession.builder().appName("Test 
Log").getOrCreate();
            Dataset<String> logData = spark.read().textFile(filePath).cache();

            System.out.println("TestLog: end,count=" + logData.count(););

            spark.stop();
      }
}


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