Package org.apache.flink.streaming.api.graph

Interface StreamGraphHasher

All Known Implementing Classes:

StreamGraphHasherV2, StreamGraphUserHashHasher

public interface StreamGraphHasher

Interface for different implementations of generating hashes over a stream graph.

Method Summary

Modifier and Type	Method	Description
boolean	generateHashesByStreamNodeId(int streamNodeId, StreamGraph streamGraph, Map<Integer,byte[]> hashes)	Generates a hash for StreamNode with the specified stream node id in the StreamGraph.
Map<Integer,byte[]>	traverseStreamGraphAndGenerateHashes(StreamGraph streamGraph)	Returns a map with a hash for each StreamNode of the StreamGraph.

Method Details

traverseStreamGraphAndGenerateHashes

Map<Integer,byte[]> traverseStreamGraphAndGenerateHashes(StreamGraph streamGraph)

Returns a map with a hash for each StreamNode of the StreamGraph. The hash is used as the JobVertexID in order to identify nodes across job submissions if they didn't change.

generateHashesByStreamNodeId

boolean generateHashesByStreamNodeId(int streamNodeId,
 StreamGraph streamGraph,
 Map<Integer,byte[]> hashes)

Generates a hash for StreamNode with the specified stream node id in the StreamGraph. This hash is stored in the provided map and can be used to uniquely identify the StreamNode across job submissions, assuming its configuration remains unchanged.