StagesTab
== [[StagesTab]] StagesTab -- Stages for All Jobs
[[prefix]] StagesTab is a spark-webui-SparkUITab.md[SparkUITab] with stages spark-webui-SparkUITab.md#prefix[prefix].
StagesTab is <SparkUI is spark-webui-SparkUI.md#initialize[initialized].
When <StagesTab creates the following pages and spark-webui-WebUITab.md#attachPage[attaches] them immediately:
-
spark-webui-AllStagesPage.md[AllStagesPage]
-
spark-webui-StagePage.md[StagePage]
-
spark-webui-PoolPage.md[PoolPage]
Stages tab in spark-webui.md[web UI] shows spark-webui-AllStagesPage.md[the current state of all stages of all jobs in a Spark application] (i.e. a ROOT:SparkContext.md[]) with two optional pages for spark-webui-StagePage.md[the tasks and statistics for a stage] (when a stage is selected) and spark-webui-PoolPage.md[pool details] (when the application works in spark-scheduler-SchedulingMode.md#FAIR[FAIR scheduling mode]).
The title of the tab is Stages for All Jobs.
You can access the Stages tab under /stages URL, i.e. http://localhost:4040/stages.
With no jobs submitted yet (and hence no stages to display), the page shows nothing but the title.
.Stages Page Empty image::spark-webui-stages-empty.png[align="center"]
The Stages page shows the stages in a Spark application per state in their respective sections -- Active Stages, Pending Stages, Completed Stages, and Failed Stages.
.Stages Page With One Stage Completed image::spark-webui-stages-completed.png[align="center"]
NOTE: The state sections are only displayed when there are stages in a given state. Refer to spark-webui-AllStagesPage.md[Stages for All Jobs].
In spark-scheduler-SchedulingMode.md#FAIR[FAIR scheduling mode] you have access to the table showing the scheduler pools.
.Fair Scheduler Pools Table image::spark-webui-stages-fairschedulerpools.png[align="center"]
Internally, the page is represented by https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/ui/jobs/StagesTab.scala[org.apache.spark.ui.jobs.StagesTab] class.
The page uses the parent's spark-webui-SparkUI.md[SparkUI] to access required services, i.e. ROOT:SparkContext.md[], spark-sql-SQLConf.md[SparkConf], spark-webui-JobProgressListener.md[JobProgressListener], spark-webui-RDDOperationGraphListener.md[RDDOperationGraphListener], and to know whether <
StagesTab is <
=== [[killEnabled]] killEnabled flag
CAUTION: FIXME
=== [[creating-instance]] Creating StagesTab Instance
StagesTab takes the following when created:
- [[parent]] spark-webui-SparkUI.md[SparkUI]
- [[store]] core:AppStatusStore.md[]
=== [[handleKillRequest]] Handling Request to Kill Stage (from web UI) -- handleKillRequest Method
[source, scala]¶
handleKillRequest(request: HttpServletRequest): Unit¶
handleKillRequest...FIXME
NOTE: handleKillRequest is used when...FIXME