TriggerExecutor

TriggerExecutor is the interface for trigger executors that StreamExecution uses to execute a batch runner.

Note
Batch runner is an executable code that is executed at regular intervals. It is also called a trigger handler.
package org.apache.spark.sql.execution.streaming

trait TriggerExecutor {
  def execute(batchRunner: () => Boolean): Unit
}
Note
StreamExecution reports a IllegalStateException when TriggerExecutor is different from the two built-in implementations: OneTimeExecutor or ProcessingTimeExecutor.
Table 1. TriggerExecutor’s Available Implementations
TriggerExecutor Description

OneTimeExecutor

Executes batchRunner exactly once.

ProcessingTimeExecutor

Executes batchRunner at regular intervals (as defined using ProcessingTime and DataStreamWriter.trigger method).

ProcessingTimeExecutor(processingTime: ProcessingTime, clock: Clock = new SystemClock())
Note
Processing terminates when batchRunner returns false.

notifyBatchFallingBehind Method

Caution
FIXME

results matching ""

    No results matching ""