flume-hdfs-sink/src/main/java/org/apache/flume/sink/hdfs/HDFSWritableSerializer.java [52:62]:
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  private Object getKey(Event e) {
    String timestamp = e.getHeaders().get("timestamp");
    long eventStamp;

    if (timestamp == null) {
      eventStamp = System.currentTimeMillis();
    } else {
      eventStamp = Long.valueOf(timestamp);
    }
    return new LongWritable(eventStamp);
  }
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flume-hdfs-sink/src/main/java/org/apache/flume/sink/hdfs/HDFSTextSerializer.java [53:64]:
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  private Object getKey(Event e) {
    // Write the data to HDFS
    String timestamp = e.getHeaders().get("timestamp");
    long eventStamp;

    if (timestamp == null) {
      eventStamp = System.currentTimeMillis();
    } else {
      eventStamp = Long.valueOf(timestamp);
    }
    return new LongWritable(eventStamp);
  }
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