org.apache.flink.runtime.checkpoint.metadata

Class MetadataV2Serializer

java.lang.Object

org.apache.flink.runtime.checkpoint.metadata.MetadataV2V3SerializerBase

org.apache.flink.runtime.checkpoint.metadata.MetadataV2Serializer

All Implemented Interfaces:

Versioned, MetadataSerializer

@Internal
public class MetadataV2Serializer
extends MetadataV2V3SerializerBase
implements MetadataSerializer

(De)serializer for checkpoint metadata format version 2. This format was introduced with Apache Flink 1.3.0.

See MetadataV2V3SerializerBase for a description of the format layout.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.flink.runtime.checkpoint.metadata.MetadataV2V3SerializerBase

MetadataV2V3SerializerBase.DeserializationContext

Field Summary

Fields

Modifier and Type	Field and Description
static MetadataV2Serializer	INSTANCE The singleton instance of the serializer.
static int	VERSION The metadata format version.

Method Summary

Modifier and Type	Method and Description
CheckpointMetadata	deserialize(DataInputStream dis, ClassLoader classLoader, String externalPointer) Deserializes a savepoint from an input stream.
protected OperatorState	deserializeOperatorState(DataInputStream dis, MetadataV2V3SerializerBase.DeserializationContext context)
protected OperatorSubtaskState	deserializeSubtaskState(DataInputStream dis, MetadataV2V3SerializerBase.DeserializationContext context)
int	getVersion() Returns the version number of the object.
protected void	serializeOperatorState(OperatorState operatorState, DataOutputStream dos)
protected void	serializeSubtaskState(OperatorSubtaskState subtaskState, DataOutputStream dos)

Methods inherited from class org.apache.flink.runtime.checkpoint.metadata.MetadataV2V3SerializerBase

deserializeInputChannelStateHandle, deserializeMasterState, deserializeMetadata, deserializeResultSubpartitionStateHandle, serializeInputChannelStateHandle, serializeMasterState, serializeMetadata, serializeResultSubpartitionStateHandle

Methods inherited from class java.lang.Object

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

Field Detail

VERSION

public static final int VERSION

The metadata format version.

See Also:

Constant Field Values

INSTANCE

public static final MetadataV2Serializer INSTANCE

The singleton instance of the serializer.

Method Detail

getVersion

public int getVersion()

Description copied from interface: Versioned

Returns the version number of the object. Versions numbers can be used to differentiate evolving classes.

Specified by:

getVersion in interface Versioned

deserialize

public CheckpointMetadata deserialize(DataInputStream dis,
                                      ClassLoader classLoader,
                                      String externalPointer)
                               throws IOException

Description copied from interface: MetadataSerializer

Deserializes a savepoint from an input stream.

Specified by:

deserialize in interface MetadataSerializer

Parameters:

dis - Input stream to deserialize savepoint from

classLoader - the user code class loader

externalPointer - the external pointer of the given checkpoint

Returns:

The deserialized savepoint

Throws:

IOException - Serialization failures are forwarded

serializeOperatorState

protected void serializeOperatorState(OperatorState operatorState,
                                      DataOutputStream dos)
                               throws IOException

Specified by:

serializeOperatorState in class MetadataV2V3SerializerBase

Throws:

IOException

deserializeOperatorState

protected OperatorState deserializeOperatorState(DataInputStream dis,
                                                 @Nullable
                                                 MetadataV2V3SerializerBase.DeserializationContext context)
                                          throws IOException

Specified by:

deserializeOperatorState in class MetadataV2V3SerializerBase

Throws:

IOException

serializeSubtaskState

protected void serializeSubtaskState(OperatorSubtaskState subtaskState,
                                     DataOutputStream dos)
                              throws IOException

Overrides:

serializeSubtaskState in class MetadataV2V3SerializerBase

Throws:

IOException

deserializeSubtaskState

protected OperatorSubtaskState deserializeSubtaskState(DataInputStream dis,
                                                       @Nullable
                                                       MetadataV2V3SerializerBase.DeserializationContext context)
                                                throws IOException

Overrides:

deserializeSubtaskState in class MetadataV2V3SerializerBase

Throws:

IOException