StreamGraphHasher (Flink : Runtime 2.1.0 API)

All Known Implementing Classes:

StreamGraphHasherV2, StreamGraphUserHashHasher
```
public interface StreamGraphHasher
```
Interface for different implementations of generating hashes over a stream graph.

Method Summary

All Methods Instance Methods Abstract Methods
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 Detail
  - 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.