EntropyInjectingFileSystem (Flink : Core 1.20.1-cp1 API)

```
@PublicEvolving
public interface EntropyInjectingFileSystem
```
An interface to be implemented by a FileSystem that is aware of entropy injection.
Entropy injection is a technique to spread files/objects across more parallel shards of a distributed storage (typically object store) by adding random characters to the beginning of the path/key and hence spearing the keys across a wider domain of prefixes.
Entropy injection typically works by having a recognized marker string in paths and replacing that marker with random characters.
This interface is used in conjunction with the EntropyInjector (as a poor man's way to build a mix-in in Java).

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`String`	`generateEntropy()`	Creates a string with random entropy to be injected into a path.
`String`	`getEntropyInjectionKey()`	Gets the marker string that represents the substring of a path to be replaced by the entropy characters.

- Method Detail
  - getEntropyInjectionKey
```
@Nullable
String getEntropyInjectionKey()
```
    Gets the marker string that represents the substring of a path to be replaced by the entropy characters.
    You can disable entropy injection if you return null here.
  - generateEntropy
```
String generateEntropy()
```
    Creates a string with random entropy to be injected into a path.