How to use

fail

method

in

org.apache.storm.hdfs.spout.HdfsSpout

/**
 * Execute a sequence of calls on HdfsSpout.
 *
 * @param cmds: set of commands to run, e.g. "r,r,r,r,a1,f2,...". The commands are: r[N] - receive() called N times aN - ack, item
 * number: N fN - fail, item number: N
 */
private List<String> runSpout(HdfsSpout spout, String... cmds) {
  MockCollector collector = (MockCollector) spout.getCollector();
  for (String cmd : cmds) {
    if (cmd.startsWith("r")) {
      int count = 1;
      if (cmd.length() > 1) {
        count = Integer.parseInt(cmd.substring(1));
      }
      for (int i = 0; i < count; ++i) {
        spout.nextTuple();
      }
    } else if (cmd.startsWith("a")) {
      int n = Integer.parseInt(cmd.substring(1));
      Pair<HdfsSpout.MessageId, List<Object>> item = collector.items.get(n);
      spout.ack(item.getKey());
    } else if (cmd.startsWith("f")) {
      int n = Integer.parseInt(cmd.substring(1));
      Pair<HdfsSpout.MessageId, List<Object>> item = collector.items.get(n);
      spout.fail(item.getKey());
    }
  }
  return collector.lines;
}