Blaze and Spark engines run on the Hadoop cluster that you configure in the Hadoop connection. The YARN web user interface shows each job that the engine runs as a YARN application.

The following image shows the Application Monitoring page of the YARN web user interface:

The

Application Type

indicates which engine submitted the YARN application.

The application ID is the unique identifier for the application. The application ID is a link to the application summary. The URL is the same as the Monitoring URL in the Administrator tool.

Click the

Logs

link in the application summary to view the application logs on the Hadoop cluster.

The amount of information in the application logs depends on the tracing level that you configure for a mapping in the Developer tool. The following table describes the amount of information that appears in the application logs for each tracing level:

Tracing Level	Messages
None	The log displays FATAL messages. FATAL messages include non-recoverable system failures that cause the service to shut down or become unavailable.
Terse	The log displays FATAL and ERROR code messages. ERROR messages include connection failures, failures to save or retrieve metadata, service errors.
Normal	The log displays FATAL, ERROR, and WARNING messages. WARNING errors include recoverable system failures or warnings.
Verbose initialization	The log displays FATAL, ERROR, WARNING, and INFO messages. INFO messages include system and service change messages.
Verbose data	The log displays FATAL, ERROR, WARNING, INFO, and DEBUG messages. DEBUG messages are user request logs.