Package org.apache.druid.segment.metadata

Class FingerprintGenerator

java.lang.Object

org.apache.druid.segment.metadata.FingerprintGenerator

public class FingerprintGenerator
extends Object

Utility to generate schema fingerprint which is used to ensure schema uniqueness in the metadata database. Note, that the generated fingerprint is independent of the column order.

Constructor Summary

Constructors

Constructor	Description
FingerprintGenerator(com.fasterxml.jackson.databind.ObjectMapper objectMapper)

Method Summary

Modifier and Type	Method	Description
String	generateFingerprint(SchemaPayload schemaPayload, String dataSource, int version)	Generates fingerprint or hash string for an object using SHA-256 hash algorithm.
protected RowSignature	getLexicographicallySortedSignature(RowSignature rowSignature)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

FingerprintGenerator

@Inject
public FingerprintGenerator(com.fasterxml.jackson.databind.ObjectMapper objectMapper)

Method Details

generateFingerprint

public String generateFingerprint(SchemaPayload schemaPayload,
 String dataSource,
 int version)

Generates fingerprint or hash string for an object using SHA-256 hash algorithm.

getLexicographicallySortedSignature

protected RowSignature getLexicographicallySortedSignature(RowSignature rowSignature)