Web UI — Spark Application's Web Console¶

Web UI (aka Application UI or webUI or Spark UI) is the web interface of a Spark application to monitor and inspect Spark jobs in a web browser.

web UI is available at http://[driverHostname]:4040 by default.

NOTE: The default port can be changed using spark-webui-properties.md#spark.ui.port[spark.ui.port] configuration property. SparkContext will increase the port if it is already taken until a free one is found.

web UI comes with the following tabs (pages):

. spark-webui-jobs.md[Jobs] . spark-webui-stages.md[Stages] . spark-webui-storage.md[Storage] . spark-webui-environment.md[Environment] . spark-webui-executors.md[Executors]

TIP: You can use the web UI after the application has finished by persisting events (using spark-history-server:EventLoggingListener.md[EventLoggingListener]) and using spark-history-server:index.md[Spark History Server].

NOTE: All the information that is displayed in web UI is available thanks to spark-webui-JobProgressListener.md[JobProgressListener] and other SparkListener.md[]s. One could say that web UI is a web layer over Spark listeners.