/**
* 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.physical.impl;
import java.io.IOException;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.common.types.TypeProtos.MinorType;
import org.apache.drill.common.types.Types;
import org.apache.drill.exec.exception.SchemaChangeException;
import org.apache.drill.exec.expr.TypeHelper;
import org.apache.drill.exec.memory.OutOfMemoryException;
import org.apache.drill.exec.ops.FragmentContext;
import org.apache.drill.exec.physical.base.Writer;
import org.apache.drill.exec.proto.ExecProtos.FragmentHandle;
import org.apache.drill.exec.record.AbstractRecordBatch;
import org.apache.drill.exec.record.BatchSchema;
import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
import org.apache.drill.exec.record.MaterializedField;
import org.apache.drill.exec.record.RecordBatch;
import org.apache.drill.exec.record.VectorWrapper;
import org.apache.drill.exec.store.EventBasedRecordWriter;
import org.apache.drill.exec.store.RecordWriter;
import org.apache.drill.exec.vector.AllocationHelper;
import org.apache.drill.exec.vector.BigIntVector;
import org.apache.drill.exec.vector.VarCharVector;
/* Write the RecordBatch to the given RecordWriter. */
public class WriterRecordBatch extends AbstractRecordBatch<Writer> {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(WriterRecordBatch.class);
private EventBasedRecordWriter eventBasedRecordWriter;
private RecordWriter recordWriter;
private int counter = 0;
private final RecordBatch incoming;
private boolean processed = false;
private String fragmentUniqueId;
public WriterRecordBatch(Writer writer, RecordBatch incoming, FragmentContext context, RecordWriter recordWriter) throws OutOfMemoryException {
super(writer, context);
this.incoming = incoming;
FragmentHandle handle = context.getHandle();
fragmentUniqueId = String.format("%d_%d", handle.getMajorFragmentId(), handle.getMinorFragmentId());
this.recordWriter = recordWriter;
}
@Override
public int getRecordCount() {
return container.getRecordCount();
}
@Override
protected void killIncoming(boolean sendUpstream) {
incoming.kill(sendUpstream);
}
@Override
public IterOutcome buildSchema() throws SchemaChangeException {
incoming.buildSchema();
try {
stats.startProcessing();
setupNewSchema();
} catch (Exception e) {
throw new SchemaChangeException(e);
} finally {
stats.stopProcessing();
}
return IterOutcome.OK_NEW_SCHEMA;
}
@Override
public IterOutcome innerNext() {
if(processed) {
cleanup();
// if the upstream record batch is already processed and next() is called by
// downstream then return NONE to indicate completion
return IterOutcome.NONE;
}
// process the complete upstream in one next() call
IterOutcome upstream;
do {
upstream = next(incoming);
switch(upstream) {
case NOT_YET:
case NONE:
case STOP:
if (upstream == IterOutcome.STOP) {
return upstream;
}
break;
case OK_NEW_SCHEMA:
try{
setupNewSchema();
} catch(Exception ex) {
kill(false);
logger.error("Failure during query", ex);
context.fail(ex);
return IterOutcome.STOP;
}
// fall through.
case OK:
try {
counter += eventBasedRecordWriter.write(incoming.getRecordCount());
logger.debug("Total records written so far: {}", counter);
} catch(IOException ex) {
throw new RuntimeException(ex);
}
for(VectorWrapper v : incoming) {
v.getValueVector().clear();
}
break;
default:
throw new UnsupportedOperationException();
}
} while(upstream != IterOutcome.NONE);
VarCharVector fragmentIdVector = (VarCharVector) container.getValueAccessorById(VarCharVector.class, container.getValueVectorId(SchemaPath.getSimplePath("Fragment")).getFieldIds()).getValueVector();
AllocationHelper.allocate(fragmentIdVector, 1, 50);
BigIntVector summaryVector = (BigIntVector) container.getValueAccessorById(BigIntVector.class,
container.getValueVectorId(SchemaPath.getSimplePath("Number of records written")).getFieldIds()).getValueVector();
AllocationHelper.allocate(summaryVector, 1, 8);
fragmentIdVector.getMutator().setSafe(0, fragmentUniqueId.getBytes());
fragmentIdVector.getMutator().setValueCount(1);
summaryVector.getMutator().setSafe(0, counter);
summaryVector.getMutator().setValueCount(1);
container.setRecordCount(1);
processed = true;
return IterOutcome.OK_NEW_SCHEMA;
}
protected void setupNewSchema() throws Exception {
try {
// update the schema in RecordWriter
stats.startSetup();
recordWriter.updateSchema(incoming.getSchema());
// Create two vectors for:
// 1. Fragment unique id.
// 2. Summary: currently contains number of records written.
MaterializedField fragmentIdField = MaterializedField.create(SchemaPath.getSimplePath("Fragment"), Types.required(MinorType.VARCHAR));
MaterializedField summaryField = MaterializedField.create(SchemaPath.getSimplePath("Number of records written"), Types.required(MinorType.BIGINT));
container.addOrGet(fragmentIdField);
container.addOrGet(summaryField);
container.buildSchema(BatchSchema.SelectionVectorMode.NONE);
} catch(IOException ex) {
throw new RuntimeException("Failed to update schema in RecordWriter", ex);
} finally{
stats.stopSetup();
}
eventBasedRecordWriter = new EventBasedRecordWriter(incoming, recordWriter);
container.buildSchema(SelectionVectorMode.NONE);
}
@Override
public void cleanup() {
super.cleanup();
incoming.cleanup();
try {
if (recordWriter != null) {
recordWriter.cleanup();
}
} catch(IOException ex) {
throw new RuntimeException("Failed to close RecordWriter", ex);
}
}
}