org.apache.flink.table.planner.plan.nodes.physical.stream.StreamPhysicalMiniBatchAssigner.scala Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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*
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package org.apache.flink.table.planner.plan.nodes.physical.stream
import org.apache.flink.table.planner.calcite.FlinkTypeFactory
import org.apache.flink.table.planner.plan.`trait`.MiniBatchIntervalTraitDef
import org.apache.flink.table.planner.plan.nodes.exec.stream.StreamExecMiniBatchAssigner
import org.apache.flink.table.planner.plan.nodes.exec.{InputProperty, ExecNode}
import org.apache.calcite.plan.{RelOptCluster, RelTraitSet}
import org.apache.calcite.rel.{RelNode, RelWriter, SingleRel}
import java.util
/**
* Stream physical RelNode for injecting a mini-batch event in the streaming data. The mini-batch
* event will be recognized as a boundary between two mini-batches. The following operators will
* keep track of the mini-batch events and trigger mini-batch once the mini-batch id is advanced.
*
* NOTE: currently, we leverage the runtime watermark mechanism to achieve the mini-batch, because
* runtime doesn't support customized events and the watermark mechanism fully meets mini-batch
* needs.
*/
class StreamPhysicalMiniBatchAssigner(
cluster: RelOptCluster,
traits: RelTraitSet,
inputRel: RelNode)
extends SingleRel(cluster, traits, inputRel)
with StreamPhysicalRel {
override def requireWatermark: Boolean = false
override def copy(traitSet: RelTraitSet, inputs: util.List[RelNode]): RelNode = {
new StreamPhysicalMiniBatchAssigner(
cluster,
traitSet,
inputs.get(0))
}
override def explainTerms(pw: RelWriter): RelWriter = {
val miniBatchInterval = traits.getTrait(MiniBatchIntervalTraitDef.INSTANCE).getMiniBatchInterval
super.explainTerms(pw)
.item("interval", miniBatchInterval.getInterval + "ms")
.item("mode", miniBatchInterval.getMode.toString)
}
override def translateToExecNode(): ExecNode[_] = {
val miniBatchInterval = traits.getTrait(MiniBatchIntervalTraitDef.INSTANCE).getMiniBatchInterval
new StreamExecMiniBatchAssigner(
miniBatchInterval,
InputProperty.DEFAULT,
FlinkTypeFactory.toLogicalRowType(getRowType),
getRelDetailedDescription
)
}
}