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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.drill.exec.store.easy.json;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import org.apache.drill.common.exceptions.DrillRuntimeException;
import org.apache.drill.common.exceptions.ExecutionSetupException;
import org.apache.drill.common.expression.PathSegment;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.exec.memory.OutOfMemoryException;
import org.apache.drill.exec.ops.FragmentContext;
import org.apache.drill.exec.ops.OperatorContext;
import org.apache.drill.exec.physical.impl.OutputMutator;
import org.apache.drill.exec.store.AbstractRecordReader;
import org.apache.drill.exec.vector.BaseValueVector;
import org.apache.drill.exec.vector.complex.fn.JsonReaderWithState;
import org.apache.drill.exec.vector.complex.fn.JsonRecordSplitter;
import org.apache.drill.exec.vector.complex.fn.UTF8JsonRecordSplitter;
import org.apache.drill.exec.vector.complex.impl.VectorContainerWriter;
import org.apache.drill.exec.vector.complex.writer.BaseWriter;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import com.fasterxml.jackson.core.JsonParseException;
public class JSONRecordReader2 extends AbstractRecordReader {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(JSONRecordReader2.class);
private OutputMutator mutator;
private VectorContainerWriter writer;
private Path hadoopPath;
private FileSystem fileSystem;
private InputStream stream;
private JsonReaderWithState jsonReader;
private int recordCount;
private FragmentContext fragmentContext;
private OperatorContext operatorContext;
private List<SchemaPath> columns;
private boolean enableAllTextMode;
public JSONRecordReader2(FragmentContext fragmentContext, String inputPath, FileSystem fileSystem,
List<SchemaPath> columns) throws OutOfMemoryException {
this.hadoopPath = new Path(inputPath);
this.fileSystem = fileSystem;
this.fragmentContext = fragmentContext;
this.columns = columns;
enableAllTextMode = fragmentContext.getDrillbitContext().getOptionManager().getOption("store.json.all_text_mode").bool_val;
}
@Override
public void setup(OutputMutator output) throws ExecutionSetupException {
try{
stream = fileSystem.open(hadoopPath);
JsonRecordSplitter splitter = new UTF8JsonRecordSplitter(stream);
this.writer = new VectorContainerWriter(output);
this.mutator = output;
jsonReader = new JsonReaderWithState(splitter, fragmentContext.getManagedBuffer(), columns, enableAllTextMode);
}catch(Exception e){
handleAndRaise("Failure reading JSON file.", e);
}
}
protected void handleAndRaise(String msg, Exception e) {
StringBuilder sb = new StringBuilder();
sb.append(msg).append(" - Parser was at record: ").append(recordCount+1);
if (e instanceof JsonParseException) {
JsonParseException ex = JsonParseException.class.cast(e);
sb.append(" column: ").append(ex.getLocation().getColumnNr());
}
throw new DrillRuntimeException(sb.toString(), e);
}
public OperatorContext getOperatorContext() {
return operatorContext;
}
public void setOperatorContext(OperatorContext operatorContext) {
this.operatorContext = operatorContext;
}
@Override
public int next() {
writer.allocate();
writer.reset();
recordCount = 0;
try{
outside: while(true && recordCount < BaseValueVector.INITIAL_VALUE_ALLOCATION){
writer.setPosition(recordCount);
switch(jsonReader.write(writer)){
case WRITE_SUCCEED:
recordCount++;
break;
case NO_MORE:
break outside;
case WRITE_FAILED:
if (recordCount == 0) {
throw new DrillRuntimeException("Record is too big to fit into allocated ValueVector");
}
break outside;
};
}
for (SchemaPath sp :jsonReader.getNullColumns() ) {
PathSegment root = sp.getRootSegment();
BaseWriter.MapWriter fieldWriter = writer.rootAsMap();
if (root.getChild() != null && ! root.getChild().isArray()) {
fieldWriter = fieldWriter.map(root.getNameSegment().getPath());
while ( root.getChild().getChild() != null && ! root.getChild().isArray() ) {
fieldWriter = fieldWriter.map(root.getChild().getNameSegment().getPath());
root = root.getChild();
}
fieldWriter.integer(root.getChild().getNameSegment().getPath());
} else {
fieldWriter.integer(root.getNameSegment().getPath());
}
}
writer.setValueCount(recordCount);
return recordCount;
} catch (JsonParseException e) {
handleAndRaise("Error parsing JSON.", e);
} catch (IOException e) {
handleAndRaise("Error reading JSON.", e);
}
// this is never reached
return 0;
}
@Override
public void cleanup() {
try {
stream.close();
} catch (IOException e) {
logger.warn("Failure while closing stream.", e);
}
}
}
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