com.facebook.presto.spi

Interface ConnectorSplit

public interface ConnectorSplit

Method Summary

Modifier and Type	Method and Description
Object	getInfo() Deprecated.
default Map<String,String>	getInfoMap()
NodeSelectionStrategy	getNodeSelectionStrategy() Indicate the node affinity of a Split 1.
List<HostAddress>	getPreferredNodes(NodeProvider nodeProvider) Provide a list of preferred nodes for scheduler to pick.
default Object	getSplitIdentifier()
default OptionalLong	getSplitSizeInBytes()
default SplitWeight	getSplitWeight()

Method Detail

getNodeSelectionStrategy

NodeSelectionStrategy getNodeSelectionStrategy()

Indicate the node affinity of a Split 1. HARD_AFFINITY: Split is NOT remotely accessible and has to be on specific nodes 2. SOFT_AFFINITY: Connector split provides a list of preferred nodes for engine to pick from but not mandatory. 3. NO_PREFERENCE: Split is remotely accessible and can be on any nodes

getPreferredNodes

List<HostAddress> getPreferredNodes(NodeProvider nodeProvider)

Provide a list of preferred nodes for scheduler to pick. 1. The scheduler will respect the preference if the strategy is HARD_AFFINITY. 2. Otherwise, the scheduler will prioritize the provided nodes if the strategy is SOFT_AFFINITY. But there is no guarantee that the scheduler will pick them if the provided nodes are busy. 3. Empty list indicates no preference.

getInfo

@Deprecated
Object getInfo()

Deprecated.

This method returns a raw object.

Instead use getInfoMap() method which returns a

 Map<String, String>

getInfoMap

default Map<String,String> getInfoMap()

getSplitIdentifier

default Object getSplitIdentifier()

getSplitSizeInBytes

default OptionalLong getSplitSizeInBytes()

getSplitWeight

default SplitWeight getSplitWeight()