StreamGraphUserHashHasher (Flink : Runtime 2.0-preview1 API)

java.lang.Object
- org.apache.flink.streaming.api.graph.StreamGraphUserHashHasher

All Implemented Interfaces:

StreamGraphHasher
```
public class StreamGraphUserHashHasher
extends Object
implements StreamGraphHasher
```
StreamGraphHasher that works with user provided hashes. This is useful in case we want to set (alternative) hashes explicitly, e.g. to provide a way of manual backwards compatibility between versions when the mechanism of generating hashes has changed in an incompatible way.

Constructor Summary

Constructors
Constructor Description

StreamGraphUserHashHasher()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Map<Integer,byte[]>`	`traverseStreamGraphAndGenerateHashes(StreamGraph streamGraph)`	Returns a map with a hash for each `StreamNode` of the `StreamGraph`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - StreamGraphUserHashHasher
```
public StreamGraphUserHashHasher()
```
- Method Detail
  - traverseStreamGraphAndGenerateHashes
```
public Map<Integer,byte[]> traverseStreamGraphAndGenerateHashes(StreamGraph streamGraph)
```
    Description copied from interface: StreamGraphHasher
    
    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.
    
    Specified by:
    
    traverseStreamGraphAndGenerateHashes in interface StreamGraphHasher