T
- The type to be serialized.public class KryoSerializer<T> extends TypeSerializer<T>
This serializer is intended as a fallback serializer for the cases that are not covered by the basic types, tuples, and POJOs.
The set of serializers registered with Kryo via Kryo.register(java.lang.Class)
, with their respective
IDs, depends on whether flink-java or flink-scala are on the classpath. This is for
backwards-compatibility reasons.
If neither are available (which should only apply to tests in flink-core), then:
If flink-scala is available, then:
If *only* flink-java is available, then:
Modifier | Constructor and Description |
---|---|
|
KryoSerializer(Class<T> type,
ExecutionConfig executionConfig) |
protected |
KryoSerializer(KryoSerializer<T> toCopy)
Copy-constructor that does not copy transient fields.
|
Modifier and Type | Method and Description |
---|---|
void |
copy(DataInputView source,
DataOutputView target)
Copies exactly one record from the source input view to the target output view.
|
T |
copy(T from)
Creates a deep copy of the given element in a new element.
|
T |
copy(T from,
T reuse)
Creates a copy from the given element.
|
T |
createInstance()
Creates a new instance of the data type.
|
T |
deserialize(DataInputView source)
De-serializes a record from the given source input view.
|
T |
deserialize(T reuse,
DataInputView source)
De-serializes a record from the given source input view into the given reuse record instance
if mutable.
|
KryoSerializer<T> |
duplicate()
Creates a deep copy of this serializer if it is necessary, i.e.
|
boolean |
equals(Object obj) |
com.esotericsoftware.kryo.Kryo |
getKryo() |
int |
getLength()
Gets the length of the data type, if it is a fix length data type.
|
int |
hashCode() |
boolean |
isImmutableType()
Gets whether the type is an immutable type.
|
void |
serialize(T record,
DataOutputView target)
Serializes the given record to the given target output view.
|
TypeSerializerSnapshot<T> |
snapshotConfiguration()
Snapshots the configuration of this TypeSerializer.
|
public KryoSerializer(Class<T> type, ExecutionConfig executionConfig)
protected KryoSerializer(KryoSerializer<T> toCopy)
public boolean isImmutableType()
TypeSerializer
isImmutableType
in class TypeSerializer<T>
public KryoSerializer<T> duplicate()
TypeSerializer
We need this because Serializers might be used in several threads. Stateless serializers are inherently thread-safe while stateful serializers might not be thread-safe.
duplicate
in class TypeSerializer<T>
public T createInstance()
TypeSerializer
createInstance
in class TypeSerializer<T>
public T copy(T from)
TypeSerializer
copy
in class TypeSerializer<T>
from
- The element reuse be copied.public T copy(T from, T reuse)
TypeSerializer
copy
in class TypeSerializer<T>
from
- The element to be copied.reuse
- The element to be reused. May or may not be used.public int getLength()
TypeSerializer
getLength
in class TypeSerializer<T>
-1
for variable length data types.public void serialize(T record, DataOutputView target) throws IOException
TypeSerializer
serialize
in class TypeSerializer<T>
record
- The record to serialize.target
- The output view to write the serialized data to.IOException
- Thrown, if the serialization encountered an I/O related error. Typically
raised by the output view, which may have an underlying I/O channel to which it
delegates.public T deserialize(DataInputView source) throws IOException
TypeSerializer
deserialize
in class TypeSerializer<T>
source
- The input view from which to read the data.IOException
- Thrown, if the de-serialization encountered an I/O related error.
Typically raised by the input view, which may have an underlying I/O channel from which
it reads.public T deserialize(T reuse, DataInputView source) throws IOException
TypeSerializer
deserialize
in class TypeSerializer<T>
reuse
- The record instance into which to de-serialize the data.source
- The input view from which to read the data.IOException
- Thrown, if the de-serialization encountered an I/O related error.
Typically raised by the input view, which may have an underlying I/O channel from which
it reads.public void copy(DataInputView source, DataOutputView target) throws IOException
TypeSerializer
target.write(source, 8);
.copy
in class TypeSerializer<T>
source
- The input view from which to read the record.target
- The target output view to which to write the record.IOException
- Thrown if any of the two views raises an exception.public int hashCode()
hashCode
in class TypeSerializer<T>
public boolean equals(Object obj)
equals
in class TypeSerializer<T>
public TypeSerializerSnapshot<T> snapshotConfiguration()
TypeSerializer
The snapshot of the TypeSerializer is supposed to contain all information that affects the serialization format of the serializer. The snapshot serves two purposes: First, to reproduce the serializer when the checkpoint/savepoint is restored, and second, to check whether the serialization format is compatible with the serializer used in the restored program.
IMPORTANT: TypeSerializerSnapshots changed after Flink 1.6. Serializers implemented against Flink versions up to 1.6 should still work, but adjust to new model to enable state evolution and be future-proof. See the class-level comments, section "Upgrading TypeSerializers to the new TypeSerializerSnapshot model" for details.
snapshotConfiguration
in class TypeSerializer<T>
null
).TypeSerializerSnapshot.resolveSchemaCompatibility(TypeSerializer)
@VisibleForTesting public com.esotericsoftware.kryo.Kryo getKryo()
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