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Enhance ValueWriter to better error messages
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Improve ValueWriter interface to allow the object causing the
serialization to fail to be properly reported
relates #370
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@costin
costin committed Feb 2, 2015
1 parent 464ec6a commit 14ead2c
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Showing 15 changed files with 442 additions and 346 deletions.
14 changes: 8 additions & 6 deletions cascading/src/main/java/org/elasticsearch/hadoop/cascading/CascadingValueWriter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,7 @@ public CascadingValueWriter(boolean writeUnknownTypes) {

@SuppressWarnings("unchecked")
@Override
public boolean write(SinkCall<Object[], ?> sinkCall, Generator generator) {
public Result write(SinkCall<Object[], ?> sinkCall, Generator generator) {
Tuple tuple = CascadingUtils.coerceToString(sinkCall);
// consider names (in case of aliases these are already applied)
List<String> names = (List<String>) sinkCall.getContext()[0];
Expand All @@ -58,18 +58,20 @@ public boolean write(SinkCall<Object[], ?> sinkCall, Generator generator) {
for (int i = 0; i < tuple.size(); i++) {
String name = (i < names.size() ? names.get(i) : "tuple" + i);
// filter out fields
if (shouldKeep(generator.getParentPath(), name)) {
if (shouldKeep(generator.getParentPath(), name)) {
generator.writeFieldName(name);
Object object = tuple.getObject(i);
if (!jdkWriter.write(object, generator)) {
if (!(object instanceof Writable) || !writableWriter.write((Writable) object, generator)) {
return false;
Result result = jdkWriter.write(object, generator);
if (!result.isSuccesful()) {
if (object instanceof Writable) {
return writableWriter.write((Writable) object, generator);
}
return Result.FAILED(object);
}
}
}
generator.writeEndObject();
return true;
return Result.SUCCESFUL();
}

@Override
Expand Down
49 changes: 24 additions & 25 deletions hive/src/main/java/org/elasticsearch/hadoop/hive/HiveValueWriter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,7 @@
public class HiveValueWriter extends FilteringValueWriter<HiveType> {

private final boolean writeUnknownTypes;
private final HiveWritableValueWriter writableWriter;
private final HiveWritableValueWriter writableWriter;
private FieldAlias alias;

public HiveValueWriter() {
Expand All @@ -50,33 +50,29 @@ public HiveValueWriter() {
}

@Override
public boolean write(HiveType type, Generator generator) {
boolean result = write(type.getObject(), type.getObjectInspector(), generator);
return result;
public Result write(HiveType type, Generator generator) {
return write(type.getObject(), type.getObjectInspector(), generator);
}

private boolean write(Object data, ObjectInspector oi, Generator generator) {
private Result write(Object data, ObjectInspector oi, Generator generator) {
if (data == null) {
generator.writeNull();
return true;
return Result.SUCCESFUL();
}

switch (oi.getCategory()) {
case PRIMITIVE:
Writable writable = (Writable) ((PrimitiveObjectInspector) oi).getPrimitiveWritableObject(data);

if (!writableWriter.write(writable, generator)) {
return false;
}
break;
return writableWriter.write(writable, generator);

case LIST: // or ARRAY
ListObjectInspector loi = (ListObjectInspector) oi;
generator.writeBeginArray();

for (int i = 0; i < loi.getListLength(data); i++) {
if (!write(loi.getListElement(data, i), loi.getListElementObjectInspector(), generator)) {
return false;
Result result = write(loi.getListElement(data, i), loi.getListElementObjectInspector(), generator);
if (!result.isSuccesful()) {
return result;
}
}
generator.writeEndArray();
Expand All @@ -94,10 +90,11 @@ private boolean write(Object data, ObjectInspector oi, Generator generator) {
String fieldName = entry.getKey().toString();

// filter out fields
if (shouldKeep(generator.getParentPath(), fieldName)) {
if (shouldKeep(generator.getParentPath(), fieldName)) {
generator.writeFieldName(alias.toES(entry.getKey().toString()));
if (!write(entry.getValue(), moi.getMapValueObjectInspector(), generator)) {
return false;
Result result = write(entry.getValue(), moi.getMapValueObjectInspector(), generator);
if (!result.isSuccesful()) {
return result;
}
}
}
Expand All @@ -112,10 +109,12 @@ private boolean write(Object data, ObjectInspector oi, Generator generator) {

generator.writeBeginObject();
for (StructField structField : refs) {
if (shouldKeep(generator.getParentPath(), structField.getFieldName())) {
if (shouldKeep(generator.getParentPath(), structField.getFieldName())) {
generator.writeFieldName(alias.toES(structField.getFieldName()));
if (!write(soi.getStructFieldData(data, structField), structField.getFieldObjectInspector(), generator)) {
return false;
Result result = write(soi.getStructFieldData(data, structField),
structField.getFieldObjectInspector(), generator);
if (!result.isSuccesful()) {
return result;
}
}
}
Expand All @@ -131,21 +130,21 @@ private boolean write(Object data, ObjectInspector oi, Generator generator) {
if (writeUnknownTypes) {
return handleUnknown(data, oi, generator);
}
return false;
return Result.FAILED(data);
}

return true;
return Result.SUCCESFUL();
}


protected boolean handleUnknown(Object value, ObjectInspector oi, Generator generator) {
return false;
protected Result handleUnknown(Object value, ObjectInspector oi, Generator generator) {
return org.elasticsearch.hadoop.serialization.builder.ValueWriter.Result.FAILED(value);
}

@Override
public void setSettings(Settings settings) {
super.setSettings(settings);
super.setSettings(settings);
alias = HiveUtils.alias(settings);
writableWriter.setSettings(settings);
writableWriter.setSettings(settings);
}
}
4 changes: 2 additions & 2 deletions hive/src/main/java/org/elasticsearch/hadoop/hive/HiveWritableValueWriter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -46,7 +46,7 @@ public HiveWritableValueWriter(boolean writeUnknownTypes) {
}

@Override
public boolean write(Writable writable, Generator generator) {
public Result write(Writable writable, Generator generator) {
if (writable instanceof ByteWritable) {
generator.writeNumber(((ByteWritable) writable).get());
}
Expand Down Expand Up @@ -83,7 +83,7 @@ else if (writable != null && HiveConstants.CHAR_WRITABLE.equals(writable.getClas
return super.write(writable, generator);
}

return true;
return Result.SUCCESFUL();
}

// use nested class to efficiently get a hold of the underlying Date object (w/o doing reparsing, etc...)
Expand Down
30 changes: 17 additions & 13 deletions mr/src/main/java/org/elasticsearch/hadoop/mr/WritableValueWriter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -53,8 +53,9 @@ public WritableValueWriter(boolean writeUnknownTypes) {
this.writeUnknownTypes = writeUnknownTypes;
}

@Override
@SuppressWarnings({ "unchecked", "deprecation" })
public boolean write(Writable writable, Generator generator) {
public Result write(Writable writable, Generator generator) {
if (writable == null || writable instanceof NullWritable) {
generator.writeNull();
}
Expand Down Expand Up @@ -104,8 +105,9 @@ else if (writable instanceof MD5Hash) {
else if (writable instanceof ArrayWritable) {
generator.writeBeginArray();
for (Writable wrt : ((ArrayWritable) writable).get()) {
if (!write(wrt, generator)) {
return false;
Result result = write(wrt, generator);
if (!result.isSuccesful()) {
return result;
}
}
generator.writeEndArray();
Expand All @@ -117,12 +119,14 @@ else if (writable instanceof AbstractMapWritable) {
generator.writeBeginObject();
// ignore handling sets (which are just maps with null values)
for (Entry<Writable, Writable> entry : map.entrySet()) {
String fieldName = entry.getKey().toString();
if (shouldKeep(generator.getParentPath(), fieldName)) {
generator.writeFieldName(fieldName);
if (!write(entry.getValue(), generator)) {
return false;
}
String fieldName = entry.getKey().toString();
if (shouldKeep(generator.getParentPath(), fieldName)) {
generator.writeFieldName(fieldName);
Result result = write(entry.getValue(), generator);

if (!result.isSuccesful()) {
return result;
}
}
}
generator.writeEndObject();
Expand All @@ -131,13 +135,13 @@ else if (writable instanceof AbstractMapWritable) {
if (writeUnknownTypes) {
return handleUnknown(writable, generator);
}
return false;
return Result.FAILED(writable);
}
return true;
return Result.SUCCESFUL();
}

protected boolean handleUnknown(Writable value, Generator generator) {
protected Result handleUnknown(Writable value, Generator generator) {
generator.writeBinary(WritableUtils.toByteArray(value));
return true;
return Result.SUCCESFUL();
}
}
14 changes: 12 additions & 2 deletions mr/src/main/java/org/elasticsearch/hadoop/serialization/builder/ContentBuilder.java
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@

import org.elasticsearch.hadoop.serialization.EsHadoopSerializationException;
import org.elasticsearch.hadoop.serialization.Generator;
import org.elasticsearch.hadoop.serialization.builder.ValueWriter.Result;
import org.elasticsearch.hadoop.serialization.json.JacksonJsonGenerator;
import org.elasticsearch.hadoop.util.Assert;
import org.elasticsearch.hadoop.util.FastByteArrayOutputStream;
Expand Down Expand Up @@ -49,8 +50,17 @@ public static ContentBuilder generate(OutputStream bos, ValueWriter writer) {

@SuppressWarnings("unchecked")
public ContentBuilder value(Object value) {
if (!writer.write(value, generator)) {
throw new EsHadoopSerializationException(String.format("Cannot handle type [%s], instance [%s] using writer [%s]", value.getClass(), value, writer));
Result result = writer.write(value, generator);
if (!result.isSuccesful()) {
String message = null;
if (value == result.unknownValue) {
message = String.format("Cannot handle type [%s], instance [%s] using writer [%s]", value.getClass(), value, writer);
}
else {
message = String.format("Cannot handle type [%s] within type [%s], instance [%s] within instance [%s] using writer [%s]",
result.unknownValue.getClass(), value.getClass(), result.unknownValue, value, writer);
}
throw new EsHadoopSerializationException(message);
}
return this;
}
Expand Down
41 changes: 22 additions & 19 deletions mr/src/main/java/org/elasticsearch/hadoop/serialization/builder/JdkValueWriter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -44,11 +44,11 @@ public JdkValueWriter(boolean writeUnknownTypes) {
}

@Override
public boolean write(Object value, Generator generator) {
return doWrite(value, generator, null);
}
public Result write(Object value, Generator generator) {
return doWrite(value, generator, null);
}

protected boolean doWrite(Object value, Generator generator, String parentField) {
protected Result doWrite(Object value, Generator generator, String parentField) {
if (value == null) {
generator.writeNull();
}
Expand Down Expand Up @@ -94,31 +94,34 @@ else if (value instanceof byte[]) {
else if (value.getClass().isArray()) {
generator.writeBeginArray();
for (Object o : (Object[]) value) {
if (!doWrite(o, generator, parentField)) {
return false;
Result result = doWrite(o, generator, parentField);
if (!result.isSuccesful()) {
return result;
}
}
generator.writeEndArray();
}
else if (value instanceof Map) {
generator.writeBeginObject();
for (Entry<?, ?> entry : ((Map<?, ?>) value).entrySet()) {
String fieldName = entry.getKey().toString();
// filter out fields
if (shouldKeep(parentField, fieldName)) {
generator.writeFieldName(fieldName);
if (!doWrite(entry.getValue(), generator, fieldName)) {
return false;
}
String fieldName = entry.getKey().toString();
// filter out fields
if (shouldKeep(parentField, fieldName)) {
generator.writeFieldName(fieldName);
Result result = doWrite(entry.getValue(), generator, fieldName);
if (!result.isSuccesful()) {
return result;
}
}
}
generator.writeEndObject();
}
else if (value instanceof Iterable) {
generator.writeBeginArray();
for (Object o : (Iterable<?>) value) {
if (!doWrite(o, generator, parentField)) {
return false;
Result result = doWrite(o, generator, parentField);
if (!result.isSuccesful()) {
return result;
}
}
generator.writeEndArray();
Expand All @@ -140,13 +143,13 @@ else if (value instanceof Timestamp) {
if (writeUnknownTypes) {
return handleUnknown(value, generator);
}
return false;
return Result.FAILED(value);
}
return true;
return Result.SUCCESFUL();
}

protected boolean handleUnknown(Object value, Generator generator) {
protected Result handleUnknown(Object value, Generator generator) {
generator.writeString(value.toString());
return true;
return Result.SUCCESFUL();
}
}
2 changes: 1 addition & 1 deletion mr/src/main/java/org/elasticsearch/hadoop/serialization/builder/NoOpValueWriter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,7 @@
public class NoOpValueWriter implements ValueWriter<Object> {

@Override
public boolean write(Object object, Generator generator) {
public Result write(Object object, Generator generator) {
throw new EsHadoopIllegalStateException("Incorrect configuration - NoOpValueWriter should not have been called");
}
}
26 changes: 24 additions & 2 deletions mr/src/main/java/org/elasticsearch/hadoop/serialization/builder/ValueWriter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -27,12 +27,34 @@
*/
public interface ValueWriter<T> {

public final class Result {
private static final Result SUCCESFUL = new Result(null);

final Object unknownValue;

private Result(Object target) {
unknownValue = target;
}

public boolean isSuccesful() {
return SUCCESFUL == this;
}

public static Result SUCCESFUL() {
return SUCCESFUL;
}

public static Result FAILED(Object target) {
return new Result(target);
}
}

/**
* Returns true if the value was written, false otherwise.
*
* @param object
* @param generator
* @return true if the value was written, false otherwise
* @return {@link Result#SUCCESFUL()} if completed, {@link Result#FAILED(Object)} otherwise containing the failing target
*/
boolean write(T object, Generator generator);
Result write(T object, Generator generator);
}
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