Java ParquetInputSplit類代碼示例

import org.apache.parquet.hadoop.ParquetInputSplit; //導入依賴的package包/類
@Override
public InputSplit[] getSplits(JobConf job, int numSplits) throws IOException {
  if (isTaskSideMetaData(job)) {
    return super.getSplits(job, numSplits);
  }

  List<Footer> footers = getFooters(job);
  List<ParquetInputSplit> splits = realInputFormat.getSplits(job, footers);
  if (splits == null) {
    return null;
  }
  InputSplit[] resultSplits = new InputSplit[splits.size()];
  int i = 0;
  for (ParquetInputSplit split : splits) {
    resultSplits[i++] = new ParquetInputSplitWrapper(split);
  }
  return resultSplits;
}
 

import org.apache.parquet.hadoop.ParquetInputSplit; //導入依賴的package包/類
/**
 * gets a ParquetInputSplit corresponding to a split given by Hive
 *
 * @param oldSplit The split given by Hive
 * @param conf The JobConf of the Hive job
 * @return a ParquetInputSplit corresponding to the oldSplit
 * @throws IOException if the config cannot be enhanced or if the footer cannot be read from the file
 */
protected ParquetInputSplit getSplit(
    final InputSplit oldSplit,
    final JobConf conf
    ) throws IOException {
  if (oldSplit instanceof FileSplit) {
    FileSplit fileSplit = (FileSplit) oldSplit;
    final long splitStart = fileSplit.getStart();
    final long splitLength = fileSplit.getLength();
    final Path finalPath = fileSplit.getPath();
    final JobConf cloneJob = hiveBinding.pushProjectionsAndFilters(conf, finalPath.getParent());

    final ParquetMetadata parquetMetadata = ParquetFileReader.readFooter(cloneJob, finalPath, SKIP_ROW_GROUPS);
    final FileMetaData fileMetaData = parquetMetadata.getFileMetaData();
    final ReadContext readContext =
        new DataWritableReadSupport()
          .init(cloneJob, fileMetaData.getKeyValueMetaData(), fileMetaData.getSchema());

    schemaSize = MessageTypeParser.parseMessageType(
          readContext.getReadSupportMetadata().get(DataWritableReadSupport.HIVE_SCHEMA_KEY)
        ).getFieldCount();
     return new ParquetInputSplit(
              finalPath,
              splitStart,
              splitStart + splitLength,
              splitLength,
              fileSplit.getLocations(),
              null);
  } else {
    throw new IllegalArgumentException("Unknown split type: " + oldSplit);
  }
}
 

import org.apache.parquet.hadoop.ParquetInputSplit; //導入依賴的package包/類
public ParquetInputSplitWrapper(ParquetInputSplit realSplit) {
  this.realSplit = realSplit;
}
 

import org.apache.parquet.hadoop.ParquetInputSplit; //導入依賴的package包/類
@Override
public void readFields(DataInput in) throws IOException {
  realSplit = new ParquetInputSplit();
  realSplit.readFields(in);
}
 

import org.apache.parquet.hadoop.ParquetInputSplit; //導入依賴的package包/類
public ParquetRecordReaderWrapper(
    final ParquetInputFormat<ArrayWritable> newInputFormat,
    final InputSplit oldSplit,
    final JobConf oldJobConf,
    final Reporter reporter,
    final HiveBinding hiveBinding)
        throws IOException, InterruptedException {
  this.splitLen = oldSplit.getLength();
  this.hiveBinding = hiveBinding;

  final ParquetInputSplit split = getSplit(oldSplit, oldJobConf);

  TaskAttemptID taskAttemptID = TaskAttemptID.forName(oldJobConf.get(IOConstants.MAPRED_TASK_ID));
  if (taskAttemptID == null) {
    taskAttemptID = new TaskAttemptID();
  }

  // create a TaskInputOutputContext
  final TaskAttemptContext taskContext = ContextUtil.newTaskAttemptContext(oldJobConf, 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]);
  }
}
 

import org.apache.parquet.hadoop.ParquetInputSplit; //導入依賴的package包/類
@Override
public void readFields(DataInput in) throws IOException {
    realSplit = new ParquetInputSplit();
    realSplit.readFields(in);
}