Java Code Examples for org.apache.pig.StoreFuncInterface#prepareToWrite()

The following examples show how to use org.apache.pig.StoreFuncInterface#prepareToWrite() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example 1

Source File: MapReducePOStoreImpl.java From spork with Apache License 2.0

6 votes

@Override
public StoreFuncInterface createStoreFunc(POStore store)
        throws IOException {

    StoreFuncInterface storeFunc = store.getStoreFunc();

    // call the setStoreLocation on the storeFunc giving it the
    // Job. Typically this will result in the OutputFormat of the
    // storeFunc storing the output location in the Configuration
    // in the Job. The PigOutFormat.setLocation() method will merge
    // this modified Configuration into the configuration of the
    // Context we have
    PigOutputFormat.setLocation(context, store);
    OutputFormat<?,?> outputFormat = storeFunc.getOutputFormat();

    // create a new record writer
    try {
        writer = outputFormat.getRecordWriter(context);
    } catch (InterruptedException e) {
        throw new IOException(e);
    }

    storeFunc.prepareToWrite(writer);

    return storeFunc;
}

Example 2

Source File: PerfTest2.java From parquet-mr with Apache License 2.0

4 votes

public static void write(String out) throws IOException, ParserException,
    InterruptedException, ExecException {
  {
    StringBuilder schemaString = new StringBuilder("a0: chararray");
    for (int i = 1; i < COLUMN_COUNT; i++) {
      schemaString.append(", a" + i + ": chararray");
    }

    String location = out;
    String schema = schemaString.toString();

    StoreFuncInterface storer = new ParquetStorer();
    Job job = new Job(conf);
    storer.setStoreFuncUDFContextSignature("sig");
    String absPath = storer.relToAbsPathForStoreLocation(location, new Path(new File(".").getAbsoluteFile().toURI()));
    storer.setStoreLocation(absPath, job);
    storer.checkSchema(new ResourceSchema(Utils.getSchemaFromString(schema)));
    @SuppressWarnings("unchecked") // that's how the base class is defined
    OutputFormat<Void, Tuple> outputFormat = storer.getOutputFormat();
    // it's ContextUtil.getConfiguration(job) and not just conf !
    JobContext jobContext = ContextUtil.newJobContext(ContextUtil.getConfiguration(job), new JobID("jt", jobid ++));
    outputFormat.checkOutputSpecs(jobContext);
    if (schema != null) {
      ResourceSchema resourceSchema = new ResourceSchema(Utils.getSchemaFromString(schema));
      storer.checkSchema(resourceSchema);
      if (storer instanceof StoreMetadata) {
        ((StoreMetadata)storer).storeSchema(resourceSchema, absPath, job);
      }
    }
    TaskAttemptContext taskAttemptContext = ContextUtil.newTaskAttemptContext(ContextUtil.getConfiguration(job), new TaskAttemptID("jt", jobid, true, 1, 0));
    RecordWriter<Void, Tuple> recordWriter = outputFormat.getRecordWriter(taskAttemptContext);
    storer.prepareToWrite(recordWriter);

    for (int i = 0; i < ROW_COUNT; i++) {
      Tuple tuple = TupleFactory.getInstance().newTuple(COLUMN_COUNT);
      for (int j = 0; j < COLUMN_COUNT; j++) {
        tuple.set(j, "a" + i + "_" + j);
      }
      storer.putNext(tuple);
    }

    recordWriter.close(taskAttemptContext);
    OutputCommitter outputCommitter = outputFormat.getOutputCommitter(taskAttemptContext);
    outputCommitter.commitTask(taskAttemptContext);
    outputCommitter.commitJob(jobContext);

  }
}