Example usage for org.apache.hadoop.mapreduce.lib.output FileOutputFormat getRecordWriter

Introduction

In this page you can find the example usage for org.apache.hadoop.mapreduce.lib.output FileOutputFormat getRecordWriter.

Prototype

public abstract RecordWriter<K, V> getRecordWriter(TaskAttemptContext job)
            throws IOException, InterruptedException;

Source Link

Usage

From source file:com.asakusafw.testdriver.file.FileOutputFormatDriver.java

License:Apache License

/**
 * Creates a new instance./*from  w w  w. ja  v  a2  s  . c  o  m*/
 * @param <K> type of key type
 * @param context target context with destination information
 * @param format the output format
 * @param key the common key to output
 * @throws IOException if failed to initialize
 * @throws IllegalArgumentException if some parameters were {@code null}
 */
<K> FileOutputFormatDriver(TaskAttemptContext context, FileOutputFormat<? super K, ? super V> format, K key)
        throws IOException {
    if (context == null) {
        throw new IllegalArgumentException("context must not be null"); //$NON-NLS-1$
    }
    if (format == null) {
        throw new IllegalArgumentException("format must not be null"); //$NON-NLS-1$
    }
    if (key == null) {
        throw new IllegalArgumentException("key must not be null"); //$NON-NLS-1$
    }
    LOG.debug("Emulating OutputFormat: {}", format.getClass().getName());
    this.context = context;
    this.format = format;
    this.key = key;
    try {
        this.writer = format.getRecordWriter(context);
    } catch (InterruptedException e) {
        throw (InterruptedIOException) new InterruptedIOException().initCause(e);
    }
}

---

From source file:org.goldenorb.OrbPartition.java

License:Apache License

private void dumpData() {
    Configuration conf = new Configuration();
    Job job = null;/*from w w  w  .j a  v a  2 s  .com*/
    JobContext jobContext = null;
    TaskAttemptContext tao = null;
    RecordWriter rw;
    VertexWriter vw;
    FileOutputFormat outputFormat;

    boolean tryAgain = true;
    int count = 0;
    while (tryAgain && count < 15)
        try {
            count++;
            tryAgain = false;
            if (job == null) {
                job = new Job(conf);
                job.setOutputFormatClass(TextOutputFormat.class);
                FileOutputFormat.setOutputPath(job,
                        new Path(new String(getOrbConf().getNameNode() + getOrbConf().getFileOutputPath())));
            }
            if (jobContext == null) {
                jobContext = new JobContext(job.getConfiguration(), new JobID());
            }

            System.out.println(jobContext.getConfiguration().get("mapred.output.dir"));

            tao = new TaskAttemptContext(jobContext.getConfiguration(),
                    new TaskAttemptID(new TaskID(jobContext.getJobID(), true, getPartitionID()), 0));
            outputFormat = (FileOutputFormat) tao.getOutputFormatClass().newInstance();
            rw = outputFormat.getRecordWriter(tao);
            vw = (VertexWriter) getOrbConf().getVertexOutputFormatClass().newInstance();
            for (Vertex v : vertices.values()) {
                OrbContext oc = vw.vertexWrite(v);
                rw.write(oc.getKey(), oc.getValue());
                // orbLogger.info("Partition: " + Integer.toString(partitionId) + "writing: " +
                // oc.getKey().toString() + ", " + oc.getValue().toString());
            }
            rw.close(tao);

            FileOutputCommitter cm = (FileOutputCommitter) outputFormat.getOutputCommitter(tao);
            if (cm.needsTaskCommit(tao)) {
                cm.commitTask(tao);
                cm.cleanupJob(jobContext);
            } else {
                cm.cleanupJob(jobContext);
                tryAgain = true;
            }

        } catch (IOException e) {
            tryAgain = true;
            e.printStackTrace();
        } catch (InstantiationException e) {
            tryAgain = true;
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            tryAgain = true;
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            tryAgain = true;
            e.printStackTrace();
        } catch (InterruptedException e) {
            tryAgain = true;
            e.printStackTrace();
        }
    if (tryAgain) {
        synchronized (this) {
            try {
                wait(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

---