PipelineExecution¶

PipelineExecution manages the lifecycle of a GraphExecution (in the given PipelineUpdateContext).

PipelineExecution is part of PipelineUpdateContext.

Creating Instance¶

PipelineExecution takes the following to be created:

• PipelineUpdateContext

PipelineExecution is created alongside PipelineUpdateContext.

Run Pipeline (and Wait for Completion)¶

runPipeline(): Unit

runPipeline starts the pipeline and requests the PipelineExecution (of this PipelineUpdateContext) to wait for the execution to complete.

runPipeline is used when:

• PipelinesHandler is requested to startRun (for Spark Connect)

Start Pipeline¶

startPipeline(): Unit

startPipeline resolves and validates the pipeline graph.

startPipeline creates a new TriggeredGraphExecution.

In the end, startPipeline requests the GraphExecution to start.

startPipeline is used when:

• PipelineExecution is requested to runPipeline

Await Completion¶

awaitCompletion(): Unit

awaitCompletion requests this GraphExecution to awaitCompletion.

awaitCompletion is used when:

• PipelineExecution is requested to runPipeline

Initialize Dataflow Graph¶

initializeGraph(): DataflowGraph

initializeGraph requests this PipelineUpdateContext for the unresolved DataflowGraph to be resolved and validated.

In the end, initializeGraph materializes the tables (datasets).

initializeGraph is used when:

• PipelineExecution is requested to start the pipeline

GraphExecution¶

graphExecution: Option[GraphExecution]

graphExecution is the GraphExecution of the pipeline.

PipelineExecution creates a TriggeredGraphExecution when startPipeline.

Used in:

• awaitCompletion
• executionStarted
• startPipeline
• stopPipeline

Is Execution Started¶

executionStarted: Boolean

executionStarted is a flag that indicates whether this GraphExecution has been created or not.

executionStarted is used when:

• SessionHolder (Spark Connect) is requested to removeCachedPipelineExecution

stopPipeline¶

stopPipeline(): Unit

stopPipeline requests this GraphExecution to stop.

In case this GraphExecution has not been created (started) yet, stopPipeline reports a IllegalStateException:

Pipeline execution has not started yet.

stopPipeline is used when:

• SessionHolder (Spark Connect) is requested to removeCachedPipelineExecution