Where are logs in Spark on YARN?

Question

I'm new to spark. Now I can run spark 0.9.1 on yarn (2.0.0-cdh4.2.1). But there is no log after execution.

The following command is used to run a spark example. But logs are not found in the history server as in a normal MapReduce job.

SPARK_JAR=./assembly/target/scala-2.10/spark-assembly-0.9.1-hadoop2.0.0-cdh4.2.1.jar \
./bin/spark-class org.apache.spark.deploy.yarn.Client --jar ./spark-example-1.0.0.jar \
--class SimpleApp --args yarn-standalone  --num-workers 3 --master-memory 1g \
--worker-memory 1g --worker-cores 1

where can I find the logs/stderr/stdout?

Is there someplace to set the configuration? I did find an output from console saying:

14/04/14 18:51:52 INFO Client: Command for the ApplicationMaster: $JAVA_HOME/bin/java -server -Xmx640m -Djava.io.tmpdir=$PWD/tmp org.apache.spark.deploy.yarn.ApplicationMaster --class SimpleApp --jar ./spark-example-1.0.0.jar --args 'yarn-standalone' --worker-memory 1024 --worker-cores 1 --num-workers 3 1> <LOG_DIR>/stdout 2> <LOG_DIR>/stderr

Answer 1

In order to get logs through command, you have got 2 ways:

1. If log aggregation is turned on (with the yarn.log-aggregation-enable yarn-site.xml) then do this:

      yarn logs -applicationId <app ID>

2. However, if this is not turned on then one needs to go on the Data-Node machine and look at

$HADOOP_HOME/logs/userlogs/application_1474886780074_XXXX/

There you will find stdin stderr stdout

application_1474886780074_XXXX is the application id