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/**
* Licensed to th7e 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.trace;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.drill.common.exceptions.ExecutionSetupException;
import org.apache.drill.exec.ExecConstants;
import org.apache.drill.exec.cache.VectorAccessibleSerializable;
import org.apache.drill.exec.exception.SchemaChangeException;
import org.apache.drill.exec.ops.FragmentContext;
import org.apache.drill.exec.physical.config.Trace;
import org.apache.drill.exec.record.AbstractSingleRecordBatch;
import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
import org.apache.drill.exec.record.RecordBatch;
import org.apache.drill.exec.record.TransferPair;
import org.apache.drill.exec.record.VectorWrapper;
import org.apache.drill.exec.record.WritableBatch;
import org.apache.drill.exec.record.selection.SelectionVector2;
import org.apache.drill.exec.util.Utilities;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
/* TraceRecordBatch contains value vectors which are exactly the same
* as the incoming record batch's value vectors. If the incoming
* record batch has a selection vector (type 2) then TraceRecordBatch
* will also contain a selection vector.
*
* Purpose of this record batch is to dump the data associated with all
* the value vectors and selection vector to disk.
*
* This record batch does not modify any data or schema, it simply
* consumes the incoming record batch's data, dump to disk and pass the
* same set of value vectors (and selection vectors) to its parent record
* batch
*/
public class TraceRecordBatch extends AbstractSingleRecordBatch<Trace> {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(TraceRecordBatch.class);
private SelectionVector2 sv = null;
/* Tag associated with each trace operator */
final String traceTag;
/* Location where the log should be dumped */
private final String logLocation;
/* File descriptors needed to be able to dump to log file */
private OutputStream fos;
public TraceRecordBatch(Trace pop, RecordBatch incoming, FragmentContext context) throws ExecutionSetupException {
super(pop, context, incoming);
this.traceTag = pop.traceTag;
logLocation = context.getConfig().getString(ExecConstants.TRACE_DUMP_DIRECTORY);
String fileName = getFileName();
/* Create the log file we will dump to and initialize the file descriptors */
try {
Configuration conf = new Configuration();
conf.set(FileSystem.FS_DEFAULT_NAME_KEY, context.getConfig().getString(ExecConstants.TRACE_DUMP_FILESYSTEM));
FileSystem fs = FileSystem.get(conf);
/* create the file */
fos = fs.create(new Path(fileName));
} catch (IOException e) {
throw new ExecutionSetupException("Unable to create file: " + fileName + " check permissions or if directory exists", e);
}
}
@Override
public int getRecordCount() {
if (sv == null)
return incoming.getRecordCount();
else
return sv.getCount();
}
/**
* Function is invoked for every record batch and it simply dumps the buffers associated with all the value vectors in
* this record batch to a log file.
*/
@Override
protected void doWork() {
boolean incomingHasSv2 = incoming.getSchema().getSelectionVectorMode() == SelectionVectorMode.TWO_BYTE;
if (incomingHasSv2) {
sv = incoming.getSelectionVector2();
} else {
sv = null;
}
WritableBatch batch = WritableBatch.getBatchNoHVWrap(incoming.getRecordCount(), incoming, incomingHasSv2 ? true
: false);
VectorAccessibleSerializable wrap = new VectorAccessibleSerializable(batch, sv, oContext.getAllocator());
try {
wrap.writeToStreamAndRetain(fos);
} catch (IOException e) {
throw new RuntimeException(e);
}
batch.reconstructContainer(container);
if (incomingHasSv2) {
sv = wrap.getSv2();
}
}
@Override
protected void setupNewSchema() throws SchemaChangeException {
/* Trace operator does not deal with hyper vectors yet */
if (incoming.getSchema().getSelectionVectorMode() == SelectionVectorMode.FOUR_BYTE)
throw new SchemaChangeException("Trace operator does not work with hyper vectors");
/*
* we have a new schema, clear our existing container to load the new value vectors
*/
container.clear();
/* Add all the value vectors in the container */
for (VectorWrapper<?> vv : incoming) {
TransferPair tp = vv.getValueVector().getTransferPair();
container.add(tp.getTo());
}
}
@Override
public SelectionVector2 getSelectionVector2() {
return sv;
}
private String getFileName() {
return Utilities.getFileNameForQueryFragment(incoming.getContext(), logLocation, traceTag);
}
@Override
public void cleanup() {
/* Release the selection vector */
if (sv != null)
sv.clear();
/* Close the file descriptors */
try {
fos.close();
} catch (IOException e) {
logger.error("Unable to close file descriptors for file: " + getFileName());
}
super.cleanup();
incoming.cleanup();
}
}
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