Package org.apache.hadoop.io.SequenceFile

Examples of org.apache.hadoop.io.SequenceFile.Writer

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    FileSystem hdfs = path.getFileSystem(conf);
    hdfs.deleteOnExit(path);

    Event e = new EventImpl("EVENT".getBytes());

    Writer w = SequenceFile.createWriter(hdfs, conf, path,
        WriteableEventKey.class, WriteableEvent.class);

    // writing
    w.append(new WriteableEventKey(e), new WriteableEvent(e));
    w.close();

    FileStatus stats = hdfs.getFileStatus(path);
    assertTrue(stats.getLen() > 0);

    // reading
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    // writing
    FSDataOutputStream dos = hdfs.create(path);
    hdfs.deleteOnExit(path);

    // this version's Writer has ownOutputStream=false.
    Writer writer = SequenceFile.createWriter(conf, dos,
        WriteableEventKey.class, WriteableEvent.class,
        SequenceFile.CompressionType.NONE, new DefaultCodec());

    Event e = new EventImpl("EVENT".getBytes());

    writer.append(new WriteableEventKey(e), new WriteableEvent(e));
    writer.sync();
    writer.close();

    dos.close(); // It is strange that I have to close the underlying
    // FSDataOutputStream.

    // WTF: nothing written by this writer!
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    FlumeConfiguration conf = FlumeConfiguration.get();
    Path path = new Path("hdfs://localhost/testfile");
    FileSystem hdfs = path.getFileSystem(conf);
    hdfs.deleteOnExit(path);

    Writer w = SequenceFile.createWriter(hdfs, conf, path,
        WriteableEventKey.class, WriteableEvent.class);
    b.mark("hdfs_fileopen_started");

    Event e = null;
    while ((e = mem.next()) != null) {
      // writing
      w.append(new WriteableEventKey(e), new WriteableEvent(e));
    }
    w.close();
    b.mark("seqfile_hdfs_write");

    hdfs.close();
    b.done();
  }
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    FlumeConfiguration conf = FlumeConfiguration.get();

    Path dstPath = new Path(p);
    FileSystem hdfs = dstPath.getFileSystem(conf);

    Writer w = SequenceFile.createWriter(hdfs, conf, dstPath,
        WriteableEventKey.class, WriteableEvent.class);

    return w;
  }
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   * Writes the message to an HDFS file whose path is substituted with tags
   * drawn from the supplied event
   */
  @Override
  public void append(Event e) throws IOException {
    Writer w = writer;

    if (shouldSub) {
      String realPath = e.escapeString(path);
      w = sfWriters.get(realPath);
      if (w == null) {
        w = openWriter(realPath);
        sfWriters.put(realPath, w);
      }
    }

    Preconditions.checkState(w != null,
        "Attempted to append to a null dfs writer!");
    w.append(new WriteableEventKey(e), new WriteableEvent(e));
    super.append(e);
  }
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Related Classes of org.apache.hadoop.io.SequenceFile.Writer

  • com.cloudera.flume.handlers.hdfs.DFSEventSink
  • com.cloudera.flume.handlers.hdfs.TestDFSWrite
  • com.cloudera.flume.PerfHdfsIO
  • com.digitalpebble.behemoth.SerializationTest
  • com.m6d.filecrush.crush.Crush
  • com.m6d.filecrush.crush.CrushPartitionerTest
  • com.m6d.filecrush.crush.CrushReducerParameterizedTest
  • com.m6d.filecrush.crush.CrushStandAloneSequenceFileTest
  • com.m6d.filecrush.crush.integration.CrushMapReduceTest
  • net.sf.katta.indexing.SequenceFileCreator
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