/**
* Licensed 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.hadoop.hive.ql.io.parquet.read;
import java.io.IOException;
import org.apache.hadoop.hive.ql.io.parquet.ParquetRecordReaderBase;
import org.apache.hadoop.mapred.FileSplit;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordReader;
import org.apache.hadoop.mapred.Reporter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.hive.ql.io.IOConstants;
import org.apache.hadoop.hive.ql.io.StatsProvidingRecordReader;
import org.apache.hadoop.hive.ql.io.parquet.ProjectionPusher;
import org.apache.hadoop.hive.serde2.SerDeStats;
import org.apache.hadoop.io.ArrayWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.TaskAttemptID;
import org.apache.parquet.hadoop.ParquetInputFormat;
import org.apache.parquet.hadoop.ParquetInputSplit;
import org.apache.parquet.hadoop.util.ContextUtil;
public class ParquetRecordReaderWrapper extends ParquetRecordReaderBase
implements RecordReader<NullWritable, ArrayWritable>, StatsProvidingRecordReader {
public static final Logger LOG = LoggerFactory.getLogger(ParquetRecordReaderWrapper.class);
private final long splitLen; // for getPos()
private org.apache.hadoop.mapreduce.RecordReader<Void, ArrayWritable> realReader;
// expect readReader return same Key & Value objects (common case)
// this avoids extra serialization & deserialization of these objects
private ArrayWritable valueObj = null;
private boolean firstRecord = false;
private boolean eof = false;
public ParquetRecordReaderWrapper(
final ParquetInputFormat<ArrayWritable> newInputFormat,
final InputSplit oldSplit,
final JobConf oldJobConf,
final Reporter reporter)
throws IOException, InterruptedException {
this(newInputFormat, oldSplit, oldJobConf, reporter, new ProjectionPusher());
}
public ParquetRecordReaderWrapper(
final ParquetInputFormat<ArrayWritable> newInputFormat,
final InputSplit oldSplit,
final JobConf oldJobConf,
final Reporter reporter,
final ProjectionPusher pusher)
throws IOException, InterruptedException {
this.splitLen = oldSplit.getLength();
this.projectionPusher = pusher;
this.serDeStats = new SerDeStats();
jobConf = oldJobConf;
final ParquetInputSplit split = getSplit(oldSplit, jobConf);
TaskAttemptID taskAttemptID = TaskAttemptID.forName(jobConf.get(IOConstants.MAPRED_TASK_ID));
if (taskAttemptID == null) {
taskAttemptID = new TaskAttemptID();
}
// create a TaskInputOutputContext
// TODO: This line is left due to incorrect Predicate push down results (parquet_ppd_char,parquet_ppd_varchar).
// The problem is that Parquet PPD is set on getSplit() function called above, but the old code used this
// line to overwrite such configuration. I'm adding a fix to timestamp issues only, so we should follow up
// this issue in another JIRA.
JobConf conf = new JobConf(oldJobConf);
// Set the TimeZone conversion in case the file has timestamp columns.
setTimeZoneConversion(conf, ((FileSplit)oldSplit).getPath());
final TaskAttemptContext taskContext = ContextUtil.newTaskAttemptContext(conf, taskAttemptID);
if (split != null) {
try {
realReader = newInputFormat.createRecordReader(split, taskContext);
realReader.initialize(split, taskContext);
// read once to gain access to key and value objects
if (realReader.nextKeyValue()) {
firstRecord = true;
valueObj = realReader.getCurrentValue();
} else {
eof = true;
}
} catch (final InterruptedException e) {
throw new IOException(e);
}
} else {
realReader = null;
eof = true;
}
if (valueObj == null) { // Should initialize the value for createValue
valueObj = new ArrayWritable(Writable.class, new Writable[schemaSize]);
}
}
@Override
public void close() throws IOException {
if (realReader != null) {
realReader.close();
}
}
@Override
public NullWritable createKey() {
return null;
}
@Override
public ArrayWritable createValue() {
return valueObj;
}
@Override
public long getPos() throws IOException {
return (long) (splitLen * getProgress());
}
@Override
public float getProgress() throws IOException {
if (realReader == null) {
return 1f;
} else {
try {
return realReader.getProgress();
} catch (final InterruptedException e) {
throw new IOException(e);
}
}
}
@Override
public boolean next(final NullWritable key, final ArrayWritable value) throws IOException {
if (eof) {
return false;
}
try {
if (firstRecord) { // key & value are already read.
firstRecord = false;
} else if (!realReader.nextKeyValue()) {
eof = true; // strictly not required, just for consistency
return false;
}
final ArrayWritable tmpCurValue = realReader.getCurrentValue();
if (value != tmpCurValue) {
final Writable[] arrValue = value.get();
final Writable[] arrCurrent = tmpCurValue.get();
if (value != null && arrValue.length == arrCurrent.length) {
System.arraycopy(arrCurrent, 0, arrValue, 0, arrCurrent.length);
} else {
if (arrValue.length != arrCurrent.length) {
throw new IOException("DeprecatedParquetHiveInput : size of object differs. Value" +
" size : " + arrValue.length + ", Current Object size : " + arrCurrent.length);
} else {
throw new IOException("DeprecatedParquetHiveInput can not support RecordReaders that" +
" don't return same key & value & value is null");
}
}
}
return true;
} catch (final InterruptedException e) {
throw new IOException(e);
}
}
}