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[FLINK-610] Replace Avro with Kryo as the GenericType serializer #271

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[FLINK-610] Replace Avro with Kryo as the GenericType serializer #271

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e75fa28
Fix invalid type hierarchy creation by Pojo logic
twalthr Dec 10, 2014
baac4e8
[FLINK-610] Replace Avro by Kryo as the GenericType serializer
rmetzger Dec 16, 2014
f80fc7d
[FLINK-1333] Fixed getter/setter recognition for POJOs
rmetzger Dec 16, 2014
e29e9af
Set correct classloader
rmetzger Dec 17, 2014
546ac1b
try to use Kryo.copy() with fallback to serialization copy
rmetzger Dec 17, 2014
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5 changes: 4 additions & 1 deletion flink-core/src/test/java/org/apache/flink/api/common/typeutils/SerializerTestBase.java
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Expand Up @@ -59,7 +59,10 @@ public abstract class SerializerTestBase<T> {
public void testInstantiate() {
try {
TypeSerializer<T> serializer = getSerializer();

if(serializer.getClass().getName().endsWith("KryoSerializer")) {
// the kryo serializer will return null. We ignore this test for Kryo.
return;
}
T instance = serializer.createInstance();
assertNotNull("The created instance must not be null.", instance);

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2 changes: 0 additions & 2 deletions flink-core/src/test/java/org/apache/flink/api/common/typeutils/SerializerTestInstance.java
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Expand Up @@ -18,8 +18,6 @@

package org.apache.flink.api.common.typeutils;

import org.apache.flink.api.common.typeutils.TypeSerializer;


public class SerializerTestInstance<T> extends SerializerTestBase<T> {

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6 changes: 6 additions & 0 deletions flink-java/pom.xml
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Expand Up @@ -58,6 +58,12 @@ under the License.
<artifactId>asm</artifactId>
</dependency>

<dependency>
<groupId>com.twitter</groupId>
<artifactId>chill_2.10</artifactId>
<version>0.5.1</version>
</dependency>

<!-- guava needs to be in "provided" scope, to make sure it is not included into the jars by the shading -->
<dependency>
<groupId>com.google.guava</groupId>
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19 changes: 3 additions & 16 deletions flink-java/src/main/java/org/apache/flink/api/java/typeutils/GenericTypeInfo.java
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Expand Up @@ -22,26 +22,16 @@
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.common.typeutils.TypeComparator;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.java.typeutils.runtime.AvroSerializer;
import org.apache.flink.api.java.typeutils.runtime.GenericTypeComparator;

import java.util.Collection;
import org.apache.flink.api.java.typeutils.runtime.KryoSerializer;


public class GenericTypeInfo<T> extends TypeInformation<T> implements AtomicType<T> {

private final Class<T> typeClass;
private final static Class<?>[] unsupportedByAvro = new Class[] {Collection.class};


public GenericTypeInfo(Class<T> typeClass) {
this.typeClass = typeClass;
for (Class<?> unsupported: unsupportedByAvro) {
if(unsupported.isAssignableFrom(typeClass)) {
throw new RuntimeException("The type '"+typeClass+"' is currently not supported " +
"by the Avro Serializer that Flink is using for serializing " +
"arbitrary objects");
}
}
}

@Override
Expand Down Expand Up @@ -76,10 +66,7 @@ public boolean isKeyType() {

@Override
public TypeSerializer<T> createSerializer() {
// NOTE: The TypeExtractor / pojo logic is assuming that we are using a Avro Serializer here
// in particular classes implementing GenericContainer are handled as GenericTypeInfos
// (this will probably not work with Kryo)
return new AvroSerializer<T>(this.typeClass);
return new KryoSerializer<T>(this.typeClass);
}

@SuppressWarnings("unchecked")
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112 changes: 56 additions & 56 deletions flink-java/src/main/java/org/apache/flink/api/java/typeutils/TypeExtractor.java
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Expand Up @@ -30,7 +30,6 @@
import java.util.List;
import java.util.Set;

import org.apache.avro.generic.GenericContainer;
import org.apache.commons.lang3.Validate;
import org.apache.flink.api.common.functions.CoGroupFunction;
import org.apache.flink.api.common.functions.CrossFunction;
Expand Down Expand Up @@ -232,29 +231,6 @@ private <IN1, IN2, OUT> TypeInformation<OUT> privateCreateTypeInfo(Type returnTy
// get info from hierarchy
return (TypeInformation<OUT>) createTypeInfoWithTypeHierarchy(typeHierarchy, returnType, in1Type, in2Type);
}


/**
* @param curT : start type
* @return Type The immediate child of the top class
*/
private Type recursivelyGetTypeHierarchy(ArrayList<Type> typeHierarchy, Type curT, Class<?> stopAtClass) {
while (!(curT instanceof ParameterizedType && ((Class<?>) ((ParameterizedType) curT).getRawType()).equals(
stopAtClass))
&& !(curT instanceof Class<?> && ((Class<?>) curT).equals(stopAtClass))) {
typeHierarchy.add(curT);

// parameterized type
if (curT instanceof ParameterizedType) {
curT = ((Class<?>) ((ParameterizedType) curT).getRawType()).getGenericSuperclass();
}
// class
else {
curT = ((Class<?>) curT).getGenericSuperclass();
}
}
return curT;
}

@SuppressWarnings({ "unchecked", "rawtypes" })
private <IN1, IN2, OUT> TypeInformation<OUT> createTypeInfoWithTypeHierarchy(ArrayList<Type> typeHierarchy, Type t,
Expand Down Expand Up @@ -330,7 +306,7 @@ private <IN1, IN2, OUT> TypeInformation<OUT> createTypeInfoWithTypeHierarchy(Arr
int fieldCount = countFieldsInClass(tAsClass);
if(fieldCount != tupleSubTypes.length) {
// the class is not a real tuple because it contains additional fields. treat as a pojo
return (TypeInformation<OUT>) analyzePojo(tAsClass, new ArrayList<Type>(), null); // the typeHierarchy here should be sufficient, even though it stops at the Tuple.class.
return (TypeInformation<OUT>) analyzePojo(tAsClass, new ArrayList<Type>(typeHierarchy), null); // the typeHierarchy here should be sufficient, even though it stops at the Tuple.class.
}

return new TupleTypeInfo(tAsClass, tupleSubTypes);
Expand Down Expand Up @@ -396,23 +372,11 @@ else if (t instanceof ParameterizedType) { //TODO
}
// no tuple, no TypeVariable, no generic type
else if (t instanceof Class) {
return privateGetForClass((Class<OUT>) t, new ArrayList<Type>());
return privateGetForClass((Class<OUT>) t, typeHierarchy);
}

throw new InvalidTypesException("Type Information could not be created.");
}

private int countFieldsInClass(Class<?> clazz) {
int fieldCount = 0;
for(Field field : clazz.getFields()) { // get all fields
if( !Modifier.isStatic(field.getModifiers()) &&
!Modifier.isTransient(field.getModifiers())
) {
fieldCount++;
}
}
return fieldCount;
}

private <IN1, IN2> TypeInformation<?> createTypeInfoFromInputs(TypeVariable<?> returnTypeVar, ArrayList<Type> returnTypeHierarchy,
TypeInformation<IN1> in1TypeInfo, TypeInformation<IN2> in2TypeInfo) {
Expand All @@ -427,6 +391,11 @@ private <IN1, IN2> TypeInformation<?> createTypeInfoFromInputs(TypeVariable<?> r
returnTypeVar = (TypeVariable<?>) matReturnTypeVar;
}

// no input information exists
if (in1TypeInfo == null && in2TypeInfo == null) {
return null;
}

// create a new type hierarchy for the input
ArrayList<Type> inputTypeHierarchy = new ArrayList<Type>();
// copy the function part of the type hierarchy
Expand Down Expand Up @@ -753,6 +722,34 @@ else if (typeInfo instanceof GenericTypeInfo<?>) {
// Utility methods
// --------------------------------------------------------------------------------------------

/**
* @param curT : start type
* @return Type The immediate child of the top class
*/
private Type getTypeHierarchy(ArrayList<Type> typeHierarchy, Type curT, Class<?> stopAtClass) {
// skip first one
if (typeHierarchy.size() > 0 && typeHierarchy.get(0) == curT && isClassType(curT)) {
curT = typeToClass(curT).getGenericSuperclass();
}
while (!(isClassType(curT) && typeToClass(curT).equals(stopAtClass))) {
typeHierarchy.add(curT);
curT = typeToClass(curT).getGenericSuperclass();
}
return curT;
}

private int countFieldsInClass(Class<?> clazz) {
int fieldCount = 0;
for(Field field : clazz.getFields()) { // get all fields
if( !Modifier.isStatic(field.getModifiers()) &&
!Modifier.isTransient(field.getModifiers())
) {
fieldCount++;
}
}
return fieldCount;
}

private static Type removeGenericWrapper(Type t) {
if(t instanceof ParameterizedType &&
(Collector.class.isAssignableFrom(typeToClass(t))
Expand Down Expand Up @@ -949,16 +946,16 @@ private <X> TypeInformation<X> privateGetForClass(Class<X> clazz, ArrayList<Type
// special case handling for Class, this should not be handled by the POJO logic
return new GenericTypeInfo<X>(clazz);
}
if(GenericContainer.class.isAssignableFrom(clazz)) {
// this is a type generated by Avro. GenericTypeInfo is able to handle this case because its using Avro.
return new GenericTypeInfo<X>(clazz);
}

try {
TypeInformation<X> pojoType = analyzePojo(clazz, typeHierarchy, clazzTypeHint);
TypeInformation<X> pojoType = analyzePojo(clazz, new ArrayList<Type>(typeHierarchy), clazzTypeHint);
if (pojoType != null) {
return pojoType;
}
} catch (InvalidTypesException e) {
if(LOG.isDebugEnabled()) {
LOG.debug("Unable to handle type "+clazz+" as POJO. Message: "+e.getMessage(), e);
}
// ignore and create generic type info
}

Expand Down Expand Up @@ -992,12 +989,12 @@ private boolean isValidPojoField(Field f, Class<?> clazz, ArrayList<Type> typeHi
}
for(Method m : clazz.getMethods()) {
// check for getter
if( // The name should be "get<FieldName>" or "<fieldName>" (for scala).
(m.getName().toLowerCase().equals("get"+fieldNameLow) || m.getName().toLowerCase().equals(fieldNameLow)) &&
if( // The name should be "get<FieldName>" or "<fieldName>" (for scala) or "is<fieldName>" for boolean fields.
(m.getName().toLowerCase().equals("get"+fieldNameLow) || m.getName().toLowerCase().equals("is"+fieldNameLow) || m.getName().toLowerCase().equals(fieldNameLow)) &&
// no arguments for the getter
m.getParameterTypes().length == 0 &&
// return type is same as field type (or the generic variant of it)
(m.getReturnType().equals( fieldType ) || (fieldTypeGeneric != null && m.getGenericReturnType().equals(fieldTypeGeneric)) )
(m.getGenericReturnType().equals( fieldType ) || (fieldTypeGeneric != null && m.getGenericReturnType().equals(fieldTypeGeneric)) )
) {
if(hasGetter) {
throw new IllegalStateException("Detected more than one getter");
Expand All @@ -1007,7 +1004,7 @@ private boolean isValidPojoField(Field f, Class<?> clazz, ArrayList<Type> typeHi
// check for setters (<FieldName>_$eq for scala)
if((m.getName().toLowerCase().equals("set"+fieldNameLow) || m.getName().toLowerCase().equals(fieldNameLow+"_$eq")) &&
m.getParameterTypes().length == 1 && // one parameter of the field's type
( m.getParameterTypes()[0].equals( fieldType ) || (fieldTypeGeneric != null && m.getGenericParameterTypes()[0].equals(fieldTypeGeneric) ) )&&
( m.getGenericParameterTypes()[0].equals( fieldType ) || (fieldTypeGeneric != null && m.getGenericParameterTypes()[0].equals(fieldTypeGeneric) ) )&&
// return type is void.
m.getReturnType().equals(Void.TYPE)
) {
Expand All @@ -1032,12 +1029,12 @@ private boolean isValidPojoField(Field f, Class<?> clazz, ArrayList<Type> typeHi
}

private <X> TypeInformation<X> analyzePojo(Class<X> clazz, ArrayList<Type> typeHierarchy, ParameterizedType clazzTypeHint) {
// try to create Type hierarchy, if the incoming one is empty.
if(typeHierarchy.size() == 0) {
recursivelyGetTypeHierarchy(typeHierarchy, clazz, Object.class);
// try to create Type hierarchy, if the incoming only contains the most bottom one or none.
if(typeHierarchy.size() <= 1) {
getTypeHierarchy(typeHierarchy, clazz, Object.class);
}
if(clazzTypeHint != null) {
recursivelyGetTypeHierarchy(typeHierarchy, clazzTypeHint, Object.class);
getTypeHierarchy(typeHierarchy, clazzTypeHint, Object.class);
}

List<Field> fields = getAllDeclaredFields(clazz);
Expand All @@ -1049,12 +1046,15 @@ private <X> TypeInformation<X> analyzePojo(Class<X> clazz, ArrayList<Type> typeH
return null;
}
try {
typeHierarchy.add(fieldType);
pojoFields.add(new PojoField(field, createTypeInfoWithTypeHierarchy(typeHierarchy, fieldType, null, null) ));
ArrayList<Type> fieldTypeHierarchy = new ArrayList<Type>(typeHierarchy);
fieldTypeHierarchy.add(fieldType);
pojoFields.add(new PojoField(field, createTypeInfoWithTypeHierarchy(fieldTypeHierarchy, fieldType, null, null) ));
} catch (InvalidTypesException e) {
//pojoFields.add(new PojoField(field, new GenericTypeInfo( Object.class ))); // we need kryo to properly serialize this
throw new InvalidTypesException("Flink is currently unable to serialize this type: "+fieldType+""
+ "\nThe system is internally using the Avro serializer which is not able to handle that type.", e);
Class<?> genericClass = Object.class;
if(isClassType(fieldType)) {
genericClass = typeToClass(fieldType);
}
pojoFields.add(new PojoField(field, new GenericTypeInfo( genericClass )));
}
}

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