org.apache.hudi.common.table.timeline.versioning

Interface VersionMigrator<T>

Type Parameters:

T - Metadata Type

All Superinterfaces:

Serializable

All Known Implementing Classes:

AbstractMigratorBase, CleanMetadataV1MigrationHandler, CleanMetadataV2MigrationHandler, CleanPlanV1MigrationHandler, CleanPlanV2MigrationHandler, CompactionV1MigrationHandler, CompactionV2MigrationHandler

public interface VersionMigrator<T>
extends Serializable

Responsible for upgrading and downgrading metadata versions for a specific metadata.

Method Summary

Modifier and Type	Method and Description
T	downgradeFrom(T input) Downgrades metadata of type T from next version to this version.
Integer	getManagedVersion() Version of Metadata that this class will handle.
T	upgradeFrom(T input) Upgrades metadata of type T from previous version to this version.

Method Detail

getManagedVersion

Integer getManagedVersion()

Version of Metadata that this class will handle.

Returns:

upgradeFrom

T upgradeFrom(T input)

Upgrades metadata of type T from previous version to this version.

Parameters:

input - Metadata as of previous version.

Returns:

Metadata compatible with the version managed by this class

downgradeFrom

T downgradeFrom(T input)

Downgrades metadata of type T from next version to this version.

Parameters:

input - Metadata as of next highest version

Returns:

Metadata compatible with the version managed by this class